DACSACL(1) DACS Tools and Utilities DACSACL(1)

NAME

dacsacl — list, check, or re-index access control rules

SYNOPSIS

dacsacl [dacsoptions] [ -build | -nobuild ] [-vfs vfs_uri] [...] [op-spec] [acl-name...]

DESCRIPTION

This program is part of the DACS suite.

The dacsacl utility performs administrative functions related to access control, such as:

  • validating the syntax of ACL files (parsing the XML and DACS expressions);

  • checking that the revocation list (VFS type revocations) exists and performing a syntax check on it;

  • creating an index (a directory data structure, as an XML file) of access control files; and

  • listing and deleting access tokens in the authorization cache (refer to dacs_acs(8)).

Please refer to dacs.acls(5) for details about how access control rule files are named.

Important

Version 1.4.21 introduced important changes to the way DACS processes access control files, introducing incompatibilities with earlier releases. Please pay special attention to the -convert and -build flags.

Most importantly, after adding, deleting, or editing an access control file the ACL index must be regenerated. This can be done simply by running dacsacl with no arguments.

Notes

  • So that it can be run as part of the installation procedure, dacsacl does not require dacs.conf to exist. If it does exist, however, it must be readable and syntactically correct.

  • The program emits a warning message if it finds different ACL files that contain identical url_pattern (or url_expr) attributes. It does not detect pairs of these attributes that are equivalent, however; in general, it is not possible to do so because the actual specifications used to match against a service request are not known until run time. Two or more service elements should never apply to the same service request (other than through wildcard matching) and the result of authorization testing with such rules is indeterminate.

  • The dacs_admin(8) web service provides some of the same functionality as dacsacl.

OPTIONS

In addition to the standard dacsoptions, dacsacl recognizes these options:

-build

Index rebuilding is done by default with most modes of operation, but it can be explicitly requested with this flag. If the flag is given, it is not an error if an index file does not exist (as when initially creating an index).

-nobuild

Suppress index rebuilding.

-vfs vfs_uri

This flag, which may be repeated, causes vfs_uri to be defined as if by a VFS directive, overriding any existing definition. This can be used to specify an alternate location for the item types acls or dacs_acls, for instance. As a special case, if acls (dacs_acls) is defined using this flag but not dacs_acls (acls), then only the former's index will be rebuilt.

This option can be useful in conjunction with the -un flag so that indexes can be generated before a jurisdiction has been configured.

The optional op-spec describes one of the following operations:

-convert

This flag is used to convert from the older rule processing scheme (pre-1.4.21) to the current scheme. It should only be needed by installations that are using custom rules (i.e., those other than the standard rules for DACS web pages and web services). Note that in some cases (described below) conversion is not fully automated, so the administrator may need to do some additional work.

--

This flag is a no-op that is used to prevent any following argument from being interpreted as a flag or operation.

-f file [...]

Each file argument is the pathname of an ACL file or a directory containing ACL files. Since ACL files can be organized using a directory structure, directories are checked recursively.

-l

List the full URI of each access control rule in the virtual filestore for item types acls and dacs_acls. No error checking is performed.

-s

List the name (sans prefixes) of each access control rule in the virtual filestore for item types acls and dacs_acls. No error checking is performed.

-tc

Clean up the authorization cache by deleting expired or otherwise invalid entries. Note: since there may not be any concurrency control in effect, this should probably not be done while DACS could be writing to the file.

-td # ...

Delete one or more authorization cache entries by giving their integer listing number (starting at 1, as produced by the -tl flag). Note: since there may not be any concurrency control in effect, this should probably not be done while DACS could be writing to the file.

-tl

List the entries in the authorization cache.

-tt

Truncate the authorization cache, effectively deleting everything in the cache. This is not currently implemented; in the meantime, simply delete the file or database, or copy /dev/null to it.

If one or more acl-name arguments appear they are interpreted as ACL files accessed through DACS's virtual filestore using item types acls and dacs_acls (both are checked). The applicable DACS configuration for the item type determines how an acl-name will be accessed. Note that acl-name must be the actual filename.

If no op-spec or acl-name is specified, dacsacl will examine all currently indexed ACL files configured for the appropriate DACS jurisdiction.

EXAMPLES

The following command checks all of the access control rules belonging to the jurisdiction associated with dss.example.com: 

% dacsacl -u dss.example.com -v
Checking: /usr/local/dacs/federations/dss/acls/acl.2
Checking: /usr/local/dacs/federations/dss/acls/acl.3
Checking: /usr/local/dacs/federations/dss/acls/acl.4
Checking: /usr/local/dacs/acls/acl-auth.0
(Note: duplicate keys for "acl-auth.0" and "acl-conf.0")
Checking: /usr/local/dacs/acls/acl-conf.0
(Note: duplicate keys for "acl-conf.0" and "acl-dacs.0")
Checking: /usr/local/dacs/acls/acl-dacs.0
(Note: duplicate keys for "acl-dacs.0" and "acl-passwd.0")
Checking: /usr/local/dacs/acls/acl-passwd.0
(Note: duplicate keys for "acl-passwd.0" and "acl-stddocs.0")
Checking: /usr/local/dacs/acls/acl-stddocs.0
Updated rule: [acls]dacs-fs:/usr/local/dacs/conf/acls/acl-abc.0
Updated rule: [acls]dacs-fs:/usr/local/dacs/conf/acls/acl-accounts.0
...
Built index for "acls": 44 rules
Updated rule: [dacs_acls]dacs-fs:/usr/local/dacs/acls/acl-admin.0
Updated rule: [dacs_acls]dacs-fs:/usr/local/dacs/acls/acl-auth-agent.0
...
Built index for "dacs_acls": 14 rules
58 ACL files were checked (OK)

Note

While it is not an error for access control rules to have the same numeric suffix, because the suffix partly determines the order in which roles are processed, using equal suffix values accidentally may have unintended results.

The following command checks only one access control rule belonging to the jurisdiction associated with dss.example.com: 

% dacsacl -u dss.example.com -v acl.2
Checking: /usr/local/dacs/federations/dss/acls/acl.2
1 ACL file was checked (OK)

In general, to validate and index a set of rules placed in the directory /tmp/rules: 

% dacsacl -un -q -build -vfs "[dacs_acls]file:///tmp/rules"

DIAGNOSTICS

The program exits 0 if everything was fine, 1 if an error occurred.

SEE ALSO

dacsvfs(1), dacs.acls(5), dacs_acs(8), dacs_admin(8), dacs_vfs(8)

AUTHOR

Distributed Systems Software (www.dss.ca)

COPYING

Copyright © 2003-2018 Distributed Systems Software. See the LICENSE file that accompanies the distribution for licensing information.

DACS Version 1.4.52 24-Sep-2024 DACSACL(1)

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$Id: dacsacl.1.xml 3016 2018-08-17 18:12:46Z brachman $