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All end-user access to Globus happens via the Globus web site, which is secured by 2048-bit RSA. TLS 1.1 and 1.2 are the only supported protocols. SSL Labs gives the Globus web site an A rating.

API accesses related to authentication go to auth.globus.org, which is secured by 2048-bit RSA. TLS 1.0 through 1.2 are supported. SSL Labs gives the endpoint an A rating.

API accesses related to endpoints and data transfer go to transfer.api.globus.org, which is secured by 2048-bit RSA. TLS 1.0 through 1.2 are supported, and SSL Labs currently caps the API endpoint's rating at B, due to the use of weak Diffie-Hellman key exchange parameters (also known as the Logjam attack).

TODO: CILogon authentication for logging in

TODO: Any way client-side to require TLS 1.1+ ?

The GridFTP server running on the endpoint accepts control connections from Globus only.

The endpoint_cert API returns a 2048-bit RSA key, along with a minimal certificate (in that it is lacking any X.509 extended attributes). The certificate is SHA-256-signed, and lasts for nine years. It is signed by Globus' "Globus Connect CA 3" CA.

The "Globus Connect CA 3" certificate is embedded in the globus-connect-server package, and can be viewed on GitHub.

If sharing is enabled, the "Transfer CA 2 Alpha" certificate is installed, again using the certificate built in to the globus-connect-server package, and which is available on GitHub.

TODO: Certs for user identification.

When using CILogon, proxy certificates are issued by the "CILogon Basic CA 1" or by the "CILogon Silver CA 1" certificates. Both CA certificates are built in to the globus-connect-server package, and are available on GitHub (for both basic and silver). Both CAs may also be independently downloaded from CILogon directly.

CILogon certificates are often valid for days, so when an endpoint trusts CILogon for authentication, globus-connect-server-setup installs two hourly cron jobs, each of which downloads the latest CRL for one of the CAs.

Regarding the endpoint_cert API, you can try it yourself using the globus-sdk package and the following demo code:

{% gist 5b9a820c54ff80c1f05db257a964b0be %}

The API is called by configure_credential in globus.connect.server.

The "Globus Connect CA 3" certificate is installed as part of configure_trust_roots, which is also in globus.connect.server.

The two CILogon CA certificates are installed as part of configure_trust_roots, which is also in globus.connect.server. That is also where the CRL-download cron job is defined.