This is a list of frequently asked questions (FAQ) about the InCommon Certificate Service. See the excellent CA/Browser Forum FAQ for answers to more general questions.
The InCommon Certificate Service, created by and for the higher education community, provides unlimited SSL/TLS and client certificates for one low membership fee. This includes unlimited Organizational Validation (OV) SSL/TLS certificates, Extended Validation (EV) SSL/TLS certificates, client (or personal) certificates, and code-signing certificates.
The higher education community developed this service to reduce the cost of certificates to campuses. Because InCommon is a non-profit, community-driven organization, the program provides value and benefits to the subscribers (rather than providing profit for the certificate provider). The program offers unlimited certificates for a single annual fee, which is expected to reduce the cost of certificates for many institutions.
Comodo is the certification authority and InCommon has contracted with Comodo for deep discounts that are made available to colleges and universities. As a commercial certification authority, Comodo has extensive knowledge of the marketplace and attractive features. Comodo has been operating a similar service with TERENA, the Trans-European Research and Education Networking Association. TERENA's positive association with Comodo, and its significant software development using the Comodo APIs, made this partnership attractive to InCommon and Internet2.
Any higher education institution with its primary location in the United States, who qualifies for a domain in the .edu name space, may subscribe, as well as not-for-profit regional research and education networking organizations in the United States. Subscribers must be InCommon participants or must join InCommon to be eligible for the Certificate Service.
Not-for-profit regional research and education networking organizations with primary offices in the United States that are not housed within an otherwise eligible educational institution may join this program by paying an annual fee of $2,000. No further discounts are applicable to this fee. In all cases, participation in this program is solely to allow the organization to acquire certificates for staff within that organization and for servers and services operated directly by the organization. Participation explicitly excludes the ability for the organization to issue certificates to members of the organization or to resell the service to members of the organization. This fee also applies to any non-Carnegie classified organizations who qualify for participation (i.e., organizations in the United States who currently have a .edu domain). All participating organizations must still join InCommon as is required for all participants in this program.
Yes. You must join InCommon but you don't need to use the federated identity services.
No, but we are investigating using federated identity management to simplify access to the InCommon Certificate Manager (CM).
This program is an extension of the trust services already being provided and managed by InCommon, and will require InCommon resources, including staff time and effort. In particular, implementation of this program will take advantage of the Registration Authority (RA) already managed by InCommon for establishing a trust services infrastructure with participants.
Please see the official fee schedule. Internet2 members receive a 25 percent discount.
InCommon is wholly owned by Internet2, and Internet2 is providing the initial capital required to launch the program.
There is a Certificate Service Subscriber Agreement stored in our document repository. The Subscriber Agreement is an addendum to the InCommon Participation Agreement. InCommon participation is required to take advantage of the certificate service.
Initially, institutions are required to commit to participation for an initial term of three (3) years, with the certificate service fee billed annually.
InCommon operates the Registration Authority, leveraging its current processes for verifying organizations and identity proofing officials authorized to act on behalf of an institution for certificate issuance. These individuals may be the same or different than the current InCommon administrators. It is expected that at each institution a small number of people (typically two or three) will be authorized to manage the overall institutional certificate program.
Once an institution authorizes specific individuals, they will use the InCommon Certificate Manager (or the API) for requesting individual certificates. InCommon is, by design, not in the path of certificate issuance or revocation (or even in the path of authorizing second-level personnel), only the vetting of the top-level certificate program administrators and the domains they are authorized to administer.
Comodo hosts both a GUI (called the InCommon Certificate Manager, or CM) and an API to their service for certificate issuance, management of second-level personnel and institutional policies for certificate structure, as well as support in matters such as certificate revocation.
The CM is the web-based interface used to request and manage your certificates.
An RAO is not permitted to create another RAO account. Only an MRAO may create an RAO account.
Typically, the RAOs for an organization are appointed at the time the organization subscribes to the Certificate Service. To later add another RAO account (up to a maximum of three RAOs), the vetting process described on the Certificate Service subscription page is followed.
The following certificate types are available to participants:
For security reasons, we no longer issue certificates with 1024-bit keys. Comodo will no longer accept Certificate Signing Requests generated with keys of less than 2048 bits. Existing 1024-key certificates may be used until they expire (but at your own risk of course).
Yes, private label CAs for user certificates are available under our agreement with Comodo. Intermediate CAs are hosted by Comodo, but with campus-specific names, profiles, and practice statements (if desired). They are available to subscribers who desire this functionality for an additional cost. The fees for this service are $3500 for the first year and $2400 in subsequent years.
InCommon does not offer intermediate CAs hosted by members or third parties other than Comodo.
This functionality is anticipated for a later release of the program based upon demand from the InCommon community. Our agreement with Comodo allows for cross-signing of other CAs at an additional cost.
The InCommon Certificate Service provides for unlimited Organizational Validation (OV) SSL/TLS certificates and unlimited Extended Validation (EV) SSL/TLS certificates.
See the CA/Browser Forum FAQ for definitions of these general terms.
No, the InCommon Certificate Service does not issue Domain Validation (DV) SSL/TLS certificates, which are the lowest form of SSL/TLS certificate. Instead, we issue Organizational Validation (OV) SSL/TLS certificates and Extended Validation (EV) SSL/TLS certificates.
Note that all OV SSL/TLS certificates are domain validated. Likewise, all EV SSL/TLS certificates are organizationally validated. So in that sense, all SSL/TLS certificates issued by the InCommon Certificate Service are domain validated.
Any domains administered by the institution (e.g., a professional society with a .org domain or even a .com domain) can qualify, as long as the institution can prove that it is the administrative manager for that domain. The key requirement is that the institution be the administrator of record for these domains and organizations.
The certificate program allows institutions to issue so-called wild-card certificates. Traditionally, a primary advantage of wild-card certificates has been to allow a reduction of the number of certificates purchased. Given that in this program there is no longer a price penalty for issuance of additional SSL/TLS certs, institutions may wish to reconsider the use of wild-card certificates, as it is generally believed that such certificates reduce security due to the extra burden of managing private keys in multiple locations.
A browser would reject an SSL/TLS certificate if the root certificate was not contained in the browser's trusted certificate store. Certificates issued by the InCommon Certificate Service are rooted in a CA certificate trusted by all known browsers. Therefore this is almost certainly not the problem.
Is your SSL/TLS certificate rejected by multiple browsers, say, three or more browsers not all on the same platform? Then most likely the SSL/TLS certificate and its private key have not been installed on the server, at least not correctly. Read your server documentation carefully, paying special attention to any recommended security practices.
Is your SSL/TLS certificate rejected by some browsers and not by others? Then it's almost certainly the case that the intermediate CA certificate in the certificate chain has not been configured correctly on the server. (A certificate issued by the InCommon Certificate Service has a chain length of three, with one intermediate CA certificate.) Consult your server documentation how to install the intermediate CA certificate on the server.
As it turns out, you can save yourself some time by not using a browser for testing purposes. The reason for this is discussed in subsequent FAQ entries. Some tools that have been found useful for testing are also mentioned.
See the InCommon Certificate Types for answers to this and similar questions.
No, you do not need to install any certificates in the browser. The AddTrust External CA Root certificate, which is required for browser access, ships with all known browsers. In general, intermediate CA certificates are passed from the server to the browser as needed, so yes, there is a CA certificate bundle that needs to be installed on the server, but not in the browser.
If you are a site administrator testing a new server configuration, there is one caveat, however. Some browsers (such as Firefox) will store intermediate CA certificates received from a server in the browser's certificate store, so unless you're careful, you may be tricked into believing your server is configured correctly when in fact it's not. Be sure to remove intermediate CA certificates from your browser's certificate store before testing your server configuration.
Be wary of using a browser to test your server configuration. Some browsers (such as Firefox) will store intermediate CA certificates received from a server in the browser's certificate store, so unless you're careful, you may be tricked into believing your server is configured correctly when in fact it's not. To avoid this pitfall, use
openssl to definitively test your server configuration:
openssl s_client -connect server:port -CApath /etc/ssl/certs/
If the client machine does not have an /etc/ssl/certs/ directory, download the AddTrust External CA Root certificate, and try the following command instead:
openssl s_client -connect server:port -CAfile AddTrustExternalCARoot.crt
In either case, if certificate validation succeeds, you know your server is configured correctly. Let's try a specific example:
$ openssl s_client -connect www.incommon.org:443 -CAfile AddTrustExternalCARoot.crt --- Certificate chain 0 s:/C=US/postalCode=48104/ST=MI/L=Ann Arbor/street=1000 Oakbrook Drive, suite 300/O=InCommon CA/OU=PlatinumSSL/CN=www.incommon.org i:/C=US/O=Internet2/OU=InCommon/CN=InCommon Server CA 1 s:/C=US/O=Internet2/OU=InCommon/CN=InCommon Server CA i:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root 2 s:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root i:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root ---
In the example above, note that there are three certificates in the certificate chain. This means that both the intermediate CA certificate (InCommon Server CA) and the root CA certificate (AddTrust External CA Root) are configured on the server. Only the intermediate CA certificate is required, however. The root certificate does not have to be configured on the server.
You can also use the COMODO SSL Analyzer to test a server installation.
Extended Validation (EV) Browsers:
Email Clients (S/MIME):
Micro Browsers / PDAs:
Document Security Platforms:
A subscriber to the InCommon Certificate Service may issue unlimited client certificates for no additional fee.
Three key usage types of Standard Assurance Client Certificates are available to subscribers: signing-only, encryption-only, and dual-use client certificates.
Use cases that involve the long-term encryption of data or documents raise the issue of key backup and recovery. Accordingly, key escrow, a service offered for no additional fee to subscribers of the InCommon Certificate Service, provides for backup storage of users' private keys.
Currently, we offer only Standard Assurance Client Certificates. The InCommon PKI subcommittee will ensure that future client certificate types align with emerging InCommon Identity Assurance Profiles (Bronze/Silver).
Yes, code-signing certificates are available, and they are included in the base price as well.
Unfortunately, no, not all browsers handle client certificates or code-signing certificates equally well. For example, Google Chrome can not be used to retrieve a client certificate or code-signing certificate. Instead, Chrome gives the following error message:
The server returned an invalid client certificate. Error 207 (net::ERR_CERT_INVALID)
This issue is discussed further in the Comodo knowledgebase.
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