NAME¶

lcmaps_verify_proxy.mod - LCMAPS plugin to verify a certificate chain including proxies

SYNOPSIS¶

lcmaps_verify_proxy.mod

[--allow-limited-proxy] [-certdir|-cadir|-capath|--capath <certificate_directory>] [--disallow-limited-proxy] [--discard_private_key_absence] [--max-proxy-level-ttl=<level>|--max-proxy-level-ttl@<level> <timeperiod>] [--max-voms-ttl <timeperiod>] [--never_discard_private_key_absence] [--only-enforce-lifetime-checks] [--require-limited-proxy]

DESCRIPTION¶

This plugin will test if the presented proxy certificate is authentic. This is done using OpenSSL methods to verify the certificate chain, check if the End-Entity Certificate is not revoked by checking CRLs or OCSP(*). In an lcmaps.db (5) file it is advised to run this plug-in as the first plug-in and fail the policy if there is no other way of verifying the input credentials.

Additional this plug-in can impose other policies, like proxy and VOMS life-time restrictions or require that the certificate chain is offered in a certain way, e.g. by offering a Limited proxy or (optionally) without a private key.

The plug-in takes its input from the LCMAPS framework. The certificate chain is coming from the registered (derived) STACK_OF(X509) * and the private key (when available) is taken from the registered PEM string credentials.

A certificate chain will be checked and verified by OpenSSL, but additionally to these checks this plug-in also performs semantic checks on the certificate chain based on how GT2, GT3 and RFC 3820 proxy certificates are to be constructed and used.

OPTIONS¶

--allow-limited-proxy

When enabled allow the certificate chain to contain a limited proxy certificate. GT2, GT3 and RFC Limited proxies are treated as equal.

-certdir | -cadir | -capath | --capath <certificate_directory>

This option sets the directory used to find the CA certificates, CRLs and other files used in the verification process of the presented certificate chain. Setting this option is muted by the option --only-enforce-lifetime-checks. When unset, the value of $X509_CERT_DIR will be used, when that is also unset, /etc/grid-security/certificates will be used.

--disallow-limited-proxy

When enabled all uses of limited proxies will be prohibited and treated as a failure condition. GT2, GT3 and RFC Limited proxies are treated as equal.

--discard_private_key_absence

When enabled the plug-in verification process will not fail on the absence of the private key. Having a private key to present is part of the proof of possession of the certificate chain its delegations, therefore a fundamental part of the user credentials. Discarding the private key check is useful in cases where another process has already establish trust in the user credentials by performing the private key proof of possession steps. Example: This feature can be enabled in deployments where gLExec is part of the CREAM CE. The CREAM CE's SSL handshake is taking ensuring that fully verified credentials get passed down. Counter example: This feature is not-enabled on a gLExec-on-the-WN deployment, as gLExec will need to ensure that the pilot-job payload credentials are fully verified before account mapping should occur.

--max-proxy-level-ttl=<level> | --max-proxy-level-ttl@<level> <timeperiod>

Set a maximum to the allowed validity period of the proxy certificate for a specific delegation <level>. The first delegation after an EEC certificate is <level> 0. This delegation level could be used in a MyProxy. A typical setting would be 14d-00:00 to allow for a MyProxy certificate with a validity period of two weeks.

A special <level> is indicated by an l or L. This is the leaf proxy or also known as the final delegation. A safe setting for this would be 1d-00:00 to allow a proxy certificate validity period of 1 day/24 hours.

Set the <timeperiod> in the following format: [0-99]d-[0-23][00-59]. For example 2d-13:37.

--max-voms-ttl <timeperiod>

Set a maximum to the allowed validity period of the VOMS credentials (when present). Using VOMS credentials with a validity period longer then the set timeperiod> will result in a failure.

--never_discard_private_key_absence

This setting will override the option --discard_private_key_absence and option to set the environment variable $VERIFY_PROXY_DISCARD_PRIVATE_KEY_ABSENCE which performs the same behavior.

--only-enforce-lifetime-checks

When enable this option will bypass all verification steps and will only perform the lifetime checks configured by --max-proxy-level-ttl and/or --max-voms-ttl. This option is ideal to be used in a Globus Gatekeeper, GridFTPd and/or GSI-OpenSSHd deployment.

--require-limited-proxy

Explicitly require the certificate chain to have a limited proxy as a final delegation. The plug-in will fail if the certificate chain does not have a limited proxy.

RETURN VALUES¶

LCMAPS_MOD_SUCCESS

Success.

LCMAPS_MOD_FAIL

Failure.

BUGS¶

OCSP is not functional and will be added when either CAB/Forum or the IGTF publish a clear profile.

Please report any errors to the Nikhef Grid Middleware Security Team <grid-mw-security-support@nikhef.nl>.

SEE ALSO¶

lcmaps.db(5), lcmaps(3).

AUTHORS¶

LCMAPS and the LCMAPS plug-ins were written by the Grid Middleware Security Team <grid-mw-security@nikhef.nl>.