UGIDFW(8) FreeBSD System Manager's Manual UGIDFW(8)
NAME
ugidfw - firewall-like access controls for file system objects
SYNOPSIS
ugidfw add subject [not] [[!] uid uid | minuid:maxuid] [[!]
gid gid | mingid:maxgid] [[!] jailid jailid] object [not] [[!]
uid uid | minuid:maxuid] [[!] gid gid | mingid:maxgid] [[!]
filesys path] [[!] suid] [[!] sgid] [[!] uid_of_subject] [[!]
gid_of_subject] [[!] type ardbclsp] mode arswxn
ugidfw list
ugidfw set rulenum subject [not] [[!] uid uid | minuid:maxuid] [[!]
gid gid | mingid:maxgid] [[!] jailid jailid] object [not] [[!]
uid uid | minuid:maxuid] [[!] gid gid | mingid:maxgid] [[!]
filesys path] [[!] suid] [[!] sgid] [[!] uid_of_subject] [[!]
gid_of_subject] [[!] type ardbclsp] mode arswxn
ugidfw remove rulenum
DESCRIPTION
The ugidfw utility provides an ipfw(8)-like interface to manage access to
file system objects by UID and GID, supported by the mac_bsdextended(4)
mac(9) policy.
The arguments are as follows:
add subject ... object ... mode arswxn
Add a new rule, automatically selecting the rule number.
See the description of set for syntax information.
list Produces a list of all the current ugidfw rules in the
system.
set rulenum subject ... object ... mode arswxn
Add a new rule or modify an existing rule. The arguments
are as follows:
rulenum Rule number. Entries with a lower rule number
are applied first; placing the most
frequently-matched rules at the beginning of
the list (i.e., lower-numbered) will yield a
slight performance increase.
subject [not] [[!] uid uid | minuid:maxuid] [[!] gid gid |
mingid:maxgid] [[!] jailid jailid]
Subjects performing an operation must match
all the conditions given. A leading not means
that the subject should not match the
remainder of the specification. A condition
may be prefixed by ! to indicate that
particular condition must not match the
subject. The subject can be required to have
a particular uid and/or gid. A range of
uids/gids can be specified, separated by a
colon. The subject can be required to be in a
particular jail with the jailid.
object [not] [[!] uid uid | minuid:maxuid] [[!] gid gid |
mingid:maxgid] [[!] filesys path] [[!] suid]
[[!] sgid] [[!] uid_of_subject] [[!]
gid_of_subject] [[!] type ardbclsp]
The rule will apply only to objects matching
all the specified conditions. A leading not
means that the object should not match all the
remaining conditions. A condition may be
prefixed by ! to indicate that particular
condition must not match the object. Objects
can be required to be owned by the user and/or
group specified by uid and/or gid. A range of
uids/gids can be specified, separated by a
colon. The object can be required to be in a
particular filesystem by specifying the
filesystem using filesys. Note, if the
filesystem is unmounted and remounted, then
the rule may need to be reapplied to ensure
the correct filesystem id is used. The object
can be required to have the suid or sgid bits
set. The owner of the object can be required
to match the uid_of_subject or the
gid_of_subject attempting the operation. The
type of the object can be restricted to a
subset of the following types.
a any file type
r a regular file
d a directory
b a block special device
c a character special device
l a symbolic link
s a unix domain socket
p a named pipe (FIFO)
mode arswxn Similar to chmod(1), each character represents
an access mode. If the rule applies, the
specified access permissions are enforced for
the object. When a character is specified in
the rule, the rule will allow for the
operation. Conversely, not including it will
cause the operation to be denied. The
definitions of each character are as follows:
a administrative operations
r read access
s access to file attributes
w write access
x execute access
n none
remove rulenum
Disable and remove the rule with the specified rule number.
SEE ALSO
mac_bsdextended(4), mac(9)
HISTORY
The ugidfw utility first appeared in FreeBSD 5.0.
AUTHORS
This software was contributed to the FreeBSD Project by NAI Labs, the
Security Research Division of Network Associates Inc. under DARPA/SPAWAR
contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research
program.
FreeBSD 13.1-RELEASE-p6 February 24, 2004 FreeBSD 13.1-RELEASE-p6
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