lcmaps (3) - Linux Manuals

lcmaps: The Local Credential MAPping Service

NAME

lcmaps - The Local Credential MAPping Service

SYNOPSIS

lcmaps

DESCRIPTION

The LCMAPS framework is designed to take various credentials as input, e.g. a certificate and/or VOMS credentials, and map them to Unix credentials as output. Unix credentials are the basic POSIX credentials, i.e. User ID, Group ID and Secondary Group IDs. LCMAPS is a framework that can load and run one or more 'credential mapping' plugins. The framework will load and run plugins to perform the identity mapping. Site and organizations can create their own new functionality by creating new plugins. The LCMAPS framework exposes various APIs to push credentials into the framework and to get the account mapping results in return. The lcmaps.db configuration file configures the LCMAPS plugins and configures the order in which the plugins are launch. Some practical examples are shown below.

LCMAPS is used by gLExec, the lcas-lcmaps-gt(4)-interface to interface with a Globus GT4 and GT5 Gatekeeper, GridFTP daemon and GSI-OpenSSHd, in StoRM and somewhere in XRootD.

INVOCATION

When an application initializes LCMAPS the plugins will be loaded based on the lcmaps.db configuration file. The application can use one of the APIs to provide credentials as input. The loaded plugins will be executed in the sequence described in the same lcmaps.db configuration file.

During a plugin's execution it has access to the credential data in the LCMAPS core memory. The plugin is also capable of writing credential mapping results in LCMAPS. The plugins can each resolve a part of the mapping and they can also perform actions based on these (intermediate) results, e.g. run setuid, setgid and setgroup calls or interact with an LDAP service.

The plugins are executed in a state machine. When a plugin finishes successfully it can execute a different next plugin then when it failed. This allows LCMAPS to pass different plugins to resolve a credential mapping.

ENVIRONMENT

GATEKEEPER_JM_ID

Extra Gatekeeper log message to be able to more easily track a Job Manager ID.

GLOBUSID

See $GATEKEEPER_JM_ID.

JOB_REPOSITORY_ID

See $GATEKEEPER_JM_ID, but explicitly for the purpose of the LCMAPS Job Repository plugin.

LCMAPS_DB_FILE

Override the build-in default filename for the lcmaps.db configuration file with the value of this environment variable.

LCMAPS_DEBUG_LEVEL

Tune the logging output cut off level. The numbers resemble the numbers as used in previous released in the range [1-5]. However, since LCMAPS version 1.5.0 these numbers resemble a numerically shifted Syslog number.

0

Silent logging, no messages will be written to file or Syslog.

1

All messages with a priority of LOG_ERR are written to file or Syslog. More severe error messages are squashed down to the LOG_ERR priority. This is to prevent Syslog from blocking on default configurations and to prevent Syslog from broadcasting LCMAPS related messages on the connected TTYs when old plug-ins are used.

2

All messages with a priority of LOG_WARNING or more severe, i.e. LOG_ERR, are written to file and/or Syslog.

3

All messages with a priority of LOG_NOTICE or more severe, i.e. LOG_ERR or LOG_WARNING, are written to file and/or Syslog. This is the default advertised setting for the lcas-lcmaps-gt-interface and glexec. The "FINAL CRED" messages are written on LOG_NOTICE and indicate the resulting LCMAPS mapping from an X.509 and/or VOMS credential to a Unix/POSIX credential.

4

All messages with a priority of LOG_INFO or more severe, i.e. all messages between (and including) LOG_ERR and LOG_INFO, are written to file and/or Syslog. This value is the build-in default. The success or failures of plug-ins are written on LOG_INFO. To see the flow of plug-ins this log level is the advised log level to set.

5

All messages with a priority of LOG_DEBUG or more severe, i.e. all messages between (and including) LOG_ERR and LOG_DEBUG, are written to file and/or Syslog. This is the most verbose mode and should be used carefully as the amount of information flowing from here might hinder normal operation performance if the syslogd isn't able to keep up.

LCMAPS_DIR

The base directory of the $LCMAPS_DB_FILE parameter. This variable is concatenated with the $LCMAPS_DB_FILE

LCMAPS_ETC_DIR

See $LCMAPS_DIR

LCMAPS_LOG_FILE

Overrides the build-in default file path to log the output to. When set, the logging will not go to Syslog.

LCMAPS_LOG_STRING

Prepend all log output messages with value of this environment variable

LCMAPS_MODULES_DIR

Directory to search for the LCMAPS plugins (or modules). Same as the path option in the lcmaps.db file..

LCMAPS_POLICY_NAME

A colon separated list of LCMAPS plugin execution policies. When this environment variable is present, only the listed execution policies will be executed. They will be executed in the order as written in the lcmaps.db file (from top to bottom).

LCMAPS_VERIFY_TYPE

Deprecated

LCMAPS_VOMS_EXTRACT

Deprecated

LCMAPS_X509_CERT_DIR

Specific setting equal to the $X509_CERT_DIR environment variable

LCMAPS_X509_VOMS_DIR

Specific setting equal to the $X509_VOMS_DIR environment variable

X509_CERT_DIR

The directory where all the CA files, e.g. CA certificate and CRL files, are located. The default location is: /etc/grid-security/certificates/.

X509_VOMS_DIR

This VOMS directory will hold the VOMS .lsc files and/or PEM files to authenticate the VOMS Attributes Certificates. Subdirectories are named by the VO name and scope the .lsc and PEM files in their authentication to one particular VO. The default location is: /etc/grid-security/vomsdir/.

RETURN VALUES

LCMAPS_SUCCESS

Success.

LCMAPS_FAIL

Failure.

NOTES

For an API specification, please use make doc to make the apidoc.

BUGS

The apidoc is not complete. It has most interfaces, but needs to be checked for completeness.

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

AUTHORS

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