UGIDFW(8) BSD System Manager's Manual UGIDFW(8)NAMEugidfw — firewall-like access controls for file system objects
SYNOPSISugidfw 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 sys‐
tem.
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, sepa‐
rated 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 sub‐
set 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 ALSOmac_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.
BSD February 24, 2004 BSD
