LCMAPS_VOMS_POOLACCOUNT.MOD(8) Site Access Control LCMAPS_VOMS_POOLACCOUNT.MOD(8)

lcmaps_voms_poolaccount.mod - LCMAPS plugin to switch user identity based on VOMS credentials by pool accounts

lcmaps_voms_poolaccount.mod [-gridmapfile grid-mapfile] [-gridmapdir gridmapdir] [--do-not-add-primary-gid-from-mapped-account] [--add-primary-gid-from-mapped-account] [--add-primary-gid-as-secondary-gid-from-mapped-account] [--do-not-add-secondary-gids-from-mapped-account] [--add-secondary-gids-from-mapped-account] [--use-voms-gid|--use_voms_gid|-use_voms_gid] [--use-account-gid] [--do-not-require-primary-gid] [--require-primary-gid] [--do-not-use-secondary-gids|-do_not_use_secondary_gids] [-override_inconsistency] [-max_mappings_per_credential maxnrofmappings] [-strict_poolprefix_match {yes|no}]

The VOMS poolaccount acquisition plugin is a 'VOMS-aware' modification of the lcmaps_poolaccount.mod.8 plugin. The plugin tries to find a local account (more specifically a UserID) based on the VOMS information that is available from LCMAPS, in particular the Fully Qualified Attribute Names (FQANs). The account is acquired from an account pool. The accounts in the account pool must exist on the system, either locally or through a centralised account database, e.g. LDAP.

It will first try to find an FQAN to pool-name (starting with a dot '.' instead of an alphanumeric character) mapping in the grid-mapfile which will provide it with a list of local accounts.

The gridmapdir directory is going to be used as a persistent and open mapping database. A pool is defined as being a set of accounts following a particular pattern in their naming, e.g. pool001 or atlas001. In the directory the plug-in will make a new filename consisting of the lowercase URL-encoded Subject-DN of the user, followed by the name of the Unix groups that are already mapped by other plug-ins.

For example, if the FQAN is mapped to .atlas in the grid-mapfile, it will be mapped to the pool accounts atlas001, atlas002, etc., the names of which can be found in the gridmapdir.

If there is no pool account assigned to the user yet, the plugin will try to find a free pool account (i.e. one for which the link count is 1) and make a new hardlink to it with the URL-encoded subject DN plus group names as name.

When a user returns to this site the plugin will look for the DN of the user (URL encoded) in this directory. If found, the corresponding pool account will be reassigned to the user.

Example showing the output of ls -li:

1836080 -rw-r--r-- 2 root root %2fo%3ddutchgrid%2fo%3dusers%2fo%3dnikhef%2fcn%3djohn%20doe:pool:group004
1836080 -rw-r--r-- 2 root root pool003
The filename is hardlinked to the mapped account name. Creating this hardlink is designed to be an atomic operation and verified to work on large installations serving multiple services from one NFS-share.

The plugin will resolve the UID of the mapped local (system) account username.

This file must contain FQAN to pool name mappings. It is strongly advised to set this option and to set it to an absolute path to avoid usage of the wrong file(path). When unset, the plugin will try to obtain the value from one of the environment variables (see ENVIRONMENT). When those are also unset, the default depends on whether the plugin runs inside a (setuid-)root application. In the (setuid-)root case, the default is /etc/grid-security/grid-mapfile. In the non-(setuid-)root case, the default is <homedir>/.gridmap. In a (setuid-)root application, relative paths are taken with respect to /etc/grid-security/.

A directory used for the mapping database. If this option is unset, the plugin will try to obtain the value from the environment variable GRIDMAPDIR (see ENVIRONMENT). In a (setuid-)root application, relative paths are taken with respect to /etc/grid-security/.

After the account is mapped, do NOT add the primary Group ID from the passwd-file/LDAP of the mapped account as a part of the mapping result. Default is NOT to add the primary Group ID, unless --use-account-gid is specified. See also --add-primary-gid-from-mapped-account, --add-primary-gid-as-secondary-gid-from-mapped-account and --use-account-gid.

After the account is mapped, add the primary Group ID from the passwd-file/LDAP of the mapped account as a part of the mapping result. Default is NOT to add the primary Group ID, unless --use-account-gid is specified. See also --do-not-add-primary-gid-from-mapped-account, --add-primary-gid-as-secondary-gid-from-mapped-account and --use-account-gid.

After the account is mapped, add the primary Group ID from the passwd-file/LDAP of the mapped account as a secondary Group ID as a part of the mapping result (possibly in addition to adding it as a primary Group ID). Default is NOT to add it at all. See also --do-not-add-primary-gid-from-mapped-account, --add-primary-gid-from-mapped-account and --use-account-gid.

After the account is mapped, do NOT add the secondary Group ID(s) from the groups-file/LDAP of the mapped account as secondary Group ID(s) as a part of the mapping result. Default is NOT to add the sGIDs, unless --use-account-gid is specified. See also --add-secondary-gids-from-mapped-account --use-account-gid.

After the account is mapped, add the secondary Group ID(s) from the groups-file/LDAP of the mapped account as secondary Group ID(s) as a part of the mapping result. Default is NOT to add the secondary Group ID(s), unless --use-account-gid is specified. See also --do-not-add-secondary-gids-from-mapped-account --use-account-gid.

This option has the opposite effect of the option --use-account-gid, instructing the plugin NOT to add the mapped account group information to the mapping result. This is currently already the default and hence this option has no effect. See also --use-account-gid.

By default this plugin will NOT add the primary and secondary Group ID(s) from the passwd-file/groups-file/LDAP of the mapped account as part of the mapping result. Specifying this option will override that default. Part or all of the group information can still be added or removed by using the --add-* and --do-not-add-* flags. See also --use-voms-gid.

The group names already present in the LCMAPS mapping store prior to the running of this plugin will be used to create the (URL encoded) lease name in the gridmapdir. This option can be used to enforce the existence of a primary Group ID prior to running this plug-in, which can be done by running other plugins earlier on in the policy. Default is not to require a primary GID.

This option has the opposite effect of the option --require-primary-gid, instructing the plugin NOT to enforce the presence of a primary GID prior to its running. This is currently already the default and hence this option has no effect. See also --require-primary-gid.

This option will prevent adding mapped secondary group names to the lease name. Default is: add secondary group names to the lease name.

Moving a user from one pool to another (because of a VO change) should normally only be done by changing the grid-mapfile indicating the new pool for this user. If the resulting URL-encoded lease (hardlink) already exists but points to a different pool account then would result from the running of this plugin, the plugin would normally fail. This option instructs the plugin to remap to the new pool account.

This feature is deprecated. It was intended to work together with the Globus Dynamic Account Service/Workspace Service. This value indicates the maximum number of accounts a user, or more specifically a set of credentials (=DN + FQANS), can be mapped to. Normally this number is 1. But if each job should run under its own account the number should be increased. Whether LCMAPS will actually use the mapcounter depends on the LCMAPS interface being used. The lease name (or poolindex) in the case of mapcounters looks like:

url_encoded(<DN>):gid1[:gid2[:gid3[...]]]:mapcount=<mapnumber>)

If this is set to 'yes', a line in the grid-mapfile like <FQAN> .pool will result in mapping pool accounts matching only the regexp pool[0-9]+. Otherwise it will be allowed to match the wider range of pool.* (legacy behaviour).

Success.
Failure.

When no grid-mapfile is specified as option to the plugin, it will try to obtain the file location from one of these environment variables.
When no gridmapdir is specified as option to the plugin, it will try to obtain the file location from this environment variable.

Since version 1.6.0 the voms_poolaccount plugin also takes the requested username (such as forwarded by gsissh) into consideration. When present, the resulting pool account has to match it in order for the plugin to succeed. This requires LCMAPS version 1.6.0 or newer.

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

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

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

February 6, 2015 Stichting FOM/Nikhef