Manpages - archive_entry_acl.3
Streaming Archive Library (libarchive, -larchive)
The
extend the standard Unix permission model. The ACL interface of
supports both POSIX.1e and NFSv4 style ACLs. Use of ACLs is restricted by various levels of ACL support in operating systems, file systems and archive formats.
A POSIX.1e ACL consists of a number of independent entries. Each entry specifies the permission set as a bitmask of basic permissions. Valid permissions in the
are:
The permissions correspond to the normal Unix permissions.
The
specifies the principal to which the permission applies. Valid values are:
The user specified by the name field.
The owner of the file.
The group specified by the name field.
The group which owns the file.
The maximum permissions to be obtained via group permissions.
Any principal who is not the file owner or a member of the owning group.
The principals
and
are equivalent to user, group and other in the classic Unix permission model and specify non-extended ACL entries.
All files have an access ACL
This specifies the permissions required for access to the file itself. Directories have an additional ACL
which controls the initial access ACL for newly-created directory entries.
A NFSv4 ACL consists of multiple individual entries called Access Control Entries (ACEs).
There are four possible types of a NFSv4 ACE:
Allow principal to perform actions requiring given permissions.
Prevent principal from performing actions requiring given permissions.
Log access attempts by principal which require given permissions.
Trigger a system alarm on access attempts by principal which require given permissions.
The
specifies the principal to which the permission applies. Valid values are:
The user specified by the name field.
The owner of the file.
The group specified by the name field.
The group which owns the file.
Any principal who is not the file owner or a member of the owning group.
Entries with the
or
tag store the user and group name in the
string and optionally the user or group ID in the
integer.
NFSv4 ACE permissions and flags are stored in the same
bitfield. Some permissions share the same constant and permission character but have different effect on directories than on files. The following ACE permissions are supported:
Read data (file).
List entries (directory).
Write data (file).
Create files (directory).
Execute file or change into a directory.
Append data (file).
Create subdirectories (directory).
Remove files and subdirectories inside a directory.
Remove file or directory.
Read file or directory attributes.
Write file or directory attributes.
Read named file or directory attributes.
Write named file or directory attributes.
Read file or directory ACL.
Write file or directory ACL.
Change owner of a file or directory.
Use synchronous I/O.
The following NFSv4 ACL inheritance flags are supported:
Inherit parent directory ACE to files.
Inherit parent directory ACE to subdirectories.
Only inherit, do not apply the permission on the directory itself.
Do not propagate inherit flags. Only first-level entries inherit ACLs.
Trigger alarm or audit on successful access.
Trigger alarm or audit on failed access.
Mark that ACE was inherited.
and
add a single ACL entry. For the access ACL and non-extended principals, the classic Unix permissions are updated. An archive entry cannot contain both POSIX.1e and NFSv4 ACL entries.
removes all ACL entries and resets the enumeration pointer.
counts the ACL entries that have the given type mask.
can be the bitwise-or of
for POSIX.1e ACLs and
for NFSv4 ACLs. For POSIX.1e ACLs if
is included and at least one extended ACL entry is found, the three non-extended ACLs are added.
and
add new
ACL entries from
text. The argument
may take one of the following values:
Supports all formats that can be created with
or respectively
Existing ACL entries are preserved. To get a clean new ACL from text
must be called first. Entries prefixed with
are treated as
unless
is
Invalid entries, non-parseable ACL entries and entries beginning with the
character
are skipped.
return the next entry of the ACL list. This functions may only be called after
has indicated the presence of extended ACL entries.
prepare reading the list of ACL entries with
The function returns 0 if no non-extended ACLs are found. In this case, the access permissions should be obtained by
or set using
Otherwise, the function returns the same value as
and
convert the ACL entries for the given type into a
string of ACL entries separated by newline. If the pointer
is not NULL, then the function shall return the length of the string
in the location pointed to by
The
argument is a bitwise-or.
The following flags are effective only on POSIX.1e ACL:
Output access ACLs.
Output POSIX.1e default ACLs.
Prefix each default ACL entry with the word
The mask and other ACLs don not contain a double colon.
The following flags are effecive only on NFSv4 ACL:
Do not output minus characters for unset permissions and flags in NFSv4 ACL permission and flag fields.
The following flags are effective on both POSIX.1e and NFSv4 ACL:
Add an additional colon-separated field containing the user or group id.
Separate ACL entries with comma instead of newline.
If the archive entry contains NFSv4 ACLs, all types of NFSv4 ACLs are returned. It the entry contains POSIX.1e ACLs and none of the flags
or
are specified, both access and default entries are returned and default entries are prefixed with
get ACL entry types contained in an archive entry’s ACL. As POSIX.1e and NFSv4 ACL entries cannot be mixed, this function is a very efficient way to detect if an ACL already contains POSIX.1e or NFSv4 ACL entries.
and
returns the number of ACL entries that match the given type mask. For POSIX.1e ACLS if the type mask includes
and at least one extended ACL entry exists, the three classic Unix permissions are counted.
and
return
if all entries were successfully parsed and
if one or more entries were invalid or non-parseable.
returns
on success,
if no more ACL entries exist and
if
has not been called first.
returns a string representing the ACL entries matching the given type and flags on success or NULL on error.
returns a wide string representing the ACL entries matching the given type and flags on success or NULL on error.
returns a bitmask of ACL entry types or 0 if archive entry has no ACL entries.