o Introduce a pile more documentation about capabilities, including
identification and descriptions of most capabilities, current inheritence rules, etc. More to follow. Reviewed by: sheldonh Obtained from: TrustedBSD Project
This commit is contained in:
Robert Watson
parent
b24f640551
commit
6fd0cf5eb0
@ -23,7 +23,7 @@
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\" $FreeBSD$
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.\"
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.\" TrustedBSD Project - support for POSIX.1e process capabilities
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.\"
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@ -45,7 +45,7 @@ state for use, if permitted.
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.Pp
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A variety of functions are provided for manipulating and managing
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process capability state and working store state:
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.Bl -tag -width cap_get_flagXX
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.Bl -tag -width cap_from_textXX
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.It Fn cap_init
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This function is described in
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.Xr cap_init 3 ,
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@ -63,6 +63,11 @@ and may be used to duplicate a capability structure.
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This function is described in
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.Xr cap_free 3 ,
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and may be used to free a capability structure.
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.It Fn cap_from_text
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This function is described in
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.Xr cap_from_text 3 ,
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and may be used to convert a text-form capability to its internal
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representation.
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.It Fn cap_get_flag
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This function, described in
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.Xr cap_get_flag 3 ,
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@ -81,17 +86,213 @@ in the working store.
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This function, described in
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.Xr cap_set_proc 3 ,
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allows setting of the current process capability state.
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.It Fn cap_to_text
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This function, described in
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.Xr cap_to_text 3 ,
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converts a capability from its internal representation to one that is
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(more) readable by humans.
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.El
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.Pp
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A number of capabilities exist, each mapping to the ability to violate
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a particular aspect of the system policy.
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Each capability in a capability set has three flags, indicating the
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status of the capability with respect to the file or process it is
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associated with.
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.Bl -tag -width CAP_INHERITABLEXX
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.It Dv CAP_EFFECTIVE
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If true, the capability will be used as necessary during accesses by
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the process.
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.It Dv CAP_INHERITABLE
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If true, the capability will be passed through
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.Xr execve 2
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invocations as appropriate.
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.It Dv CAP_PERMITTED
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If true, the capability is permitted for the process.
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.El
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.Pp
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Capability inheritence occurs when processes invoke the
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.Xr exec 3
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call, resulting in internal invocation of the
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.Xr execve 2
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system call.
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At that time, a processes capabilities are re-evaluated using a set of
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fixed algorithms.
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These algorithms take into account the starting capabilities of the process
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and the capabilities of the file being executed.
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.Pp
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pI` = pI
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.Pp
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pP` = (fP & X) | (fI & pI)
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.Pp
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pE` = (fE & pP`)
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.Pp
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p[IPE] represent the starting processes inheritted, permitted, and
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effective sets.
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p'[IPE] represent the new inheritted, permitted, and effective sets.
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f[IPE] represent the file's inheritted, permitted, and effective sets.
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X represents a global bounding set, currently un-implemented.
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.Pp
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The following capabilities are defined and implemented in
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.Fx 5.0 :
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.Pp
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.Bl -tag -width CAP_MAC_RELABEL_SUBJ
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.It Dv CAP_CHOWN
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This capability overrides the restriction that a process cannot change the
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user ID of a file it owns, and the restriction that the group ID supplied in
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the
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.Xr chown 2
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function shall be equal to either the group ID or one of the supplementary
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group IDs of the calling process.
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.It Dv CAP_DAC_EXECUTE
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This capability overrides file mode execute access restrictions when accessing
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an object, and, if
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.Xr posix1e 3
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ACLs are available, this capability overrides the ACL execute access
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restrictions when accessing an object.
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.It Dv CAP_DAC_WRITE
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This capability overrides file mode write access restrictions when access an
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object, and, if
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.Xr posix1e 3
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ACLs are available, this capability also overrides the ACL write access
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restrictions when accessing an object.
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.It Dv CAP_DAC_READ_SEARCH
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This capability overrides file mode read and search access restrictions
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when accessing an object, and, if
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.Xr posix1e 3
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ACLs are available, this capability overrides the ACL read and search access
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restrictions when accessing an object.
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.It Dv CAP_FOWNER
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This capability overrides the requirements that the user ID associated
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with a process be equal to the file owner ID, execpt in the cases where the
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CAP_FSETID capability is applicable.
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In general, this capability, when effective, permits a process to perform
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all the functions that any file owner would have for their files.
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.It Dv CAP_FSETID
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This capability overrides the following restrictions: that the effective
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user ID of the calling process shall match the file owner when setting the
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set-user-ID (S_ISUID) and set-group-ID (S_ISGID) bits on the file; that
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the effective group ID or one of the supplementary group IDs of the calling
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process shall match the group ID of the file when setting the set-group-ID
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bit of the file; and that the set-user-ID and set-group-ID bits of the file
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mode shall be cleared upon successful return from
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.Xr chown 2 .
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.It Dv CAP_KILL
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Thie capability shall override the restriction that the real or effective
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user ID of a process sending a signal must match the real of effective user
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ID of the receiving process.
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.It Dv CAP_LINK_DIR
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This capability is not available on the the FreeBSD platform.
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On other platforms, this capabiity overrides the restriction that a process
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cannot create or delete a hard link to a directory.
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.It Dv CAP_SETFCAP
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This capability overrides the restriction that a process cannot
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set the file capability state of a file.
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.It Dv CAP_SETGID
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This capability overrides the restriction in the
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.Xr setgid 2
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function that a process cannot change its real group ID or change its
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effective group ID to a value other than its real group ID.
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.It Dv CAP_SETUID
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This capability overrides the restriction in the
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.Xr setuid 2
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function that a process cannot change its real user ID or change its
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effective user ID to a value other than the current real user ID.
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.It Dv CAP_MAC_DOWNGRADE
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This capability override the restriction that no process may downgrade
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the MAC label of a file.
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.It Dv CAP_MAC_READ
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This capability overrides mandatory read access restrictions when accessing
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objects.
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.It Dv CAP_MAC_RELABEL_SUBJ
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This capability overrides the restriction that a process may not modify
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its own MAC label.
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.It Dv CAP_MAC_UPGRADE
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This capability overrides the restriction that no process may upgrade the
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MAC label of a file.
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.It Dv CAP_MAC_WRITE
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This capability overrides the mandatory write access restrictions when
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accessing objects.
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.It Dv CAP_AUDIT_CONTROL
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This capability overrides the restriction that a process cannot modify
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audit control parameters.
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.It Dv CAP_AUDIT_WRITE
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This capability overrides the restriction that a process cannot write data
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into the system audit trail.
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.It Dv CAP_SETPCAP
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This capability overrides the restriction that a process cannot expand its
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capability set when invoking
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.Xr cap_set_proc 3 .
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.It Dv CAP_SYS_SETFFLAG
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This capability overrides the restriction that a process cannot manipulate
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the system file flags on a file system object.
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For portability, equivilent to
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.Dv CAP_LINUX_IMMUTABLE .
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.It Dv CAP_NET_BIND_SERVICE
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This capability overrides network namespace restrictions on process's
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using the
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.Xr bind 2
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system call.
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For example, this capability, when effective, can be used by a process to
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bind a port number below 1024 in the IPv4 or IPv6 port spaces.
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.It Dv CAP_NET_BROADCAST
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.It Dv CAP_NET_ADMIN
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.It Dv CAP_NET_RAW
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This capability overrides the restriction that a process cannot create a
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raw socket.
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.It Dv CAP_IPC_LOCK
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.It Dv CAP_IPC_OWNER
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.It Dv CAP_SYS_MODULE
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This capability overrides the restriction that a process cannot load or
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unload kernel modules.
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.It Dv CAP_SYS_RAWIO
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.It Dv CAP_SYS_CHROOT
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This capability overrides the restriction that a process cannot invoke the
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.Xr chroot 2
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or
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.Xr jail 2
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system calls.
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.It Dv CAP_SYS_PTRACE
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This capability overrides the restriction that a process can only invoke
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the
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.Xr ptrace 2
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system call to debug another process if the target process has identical
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real and effective user IDs.
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.It Dv CAP_SYS_PACCT
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This capability overrides the restriction that a process cannot enable,
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configure, or disable system process accounting.
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.It Dv CAP_SYS_ADMIN
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.It Dv CAP_SYS_BOOT
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This capability overrides the restriction that a process cannot invoke
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the
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.Xr boot 2
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system call.
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.It Dv CAP_SYS_NICE
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This capability overrides the restrictions that a process cannot use the
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.Xr setpriority 2
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system call to decrease the priority to below that of itself, or modify the
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priority of another process.
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.It Dv CAP_SYS_RESOURCE
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This capability overrides restrictions on how a process may modify its
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soft and hard resource limits.
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.It Dv CAP_SYS_TIME
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This capability overrides the restriction that a process may not modify the
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system date and time.
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.It Dv CAP_SYS_TTY_CONFIG
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.It Dv CAP_MKNOD
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This capability overrides the restriction that a process may not create
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device nodes.
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.El
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.Pp
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Documentation of the internal kernel interfaces backing these calls may
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be found in
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.Xr cap 9 .
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The syscalls between the internal interfaces and the public library
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The system calls between the internal interfaces and the public library
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routines may change over time, and as such are not documented. They are
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not intended to be called directly without going through the library.
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.Sh IMPLEMENTATION NOTES
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FreeBSD's support for POSIX.1e interfaces and features is still under
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development at this time.
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Support for POSIX.1e interfaces and features in
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.Fx
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is still under development at this time.
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.Pp
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POSIX.1e assigns security labels to all objects, extending the security
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functionality described in POSIX.1. These additional labels provide
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@ -129,5 +330,11 @@ POSIX.1e support was introduced in
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and development continues.
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.Sh AUTHORS
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.An Robert N M Watson
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.An Ilmar S Habibulin
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.Sh BUGS
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These features are not yet included in the base FreeBSD distribution.
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While
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.Xr posix1e 3
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is fully implemented, supporting kernel code is not yet available in the
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base distribution.
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It is slated for inclusion prior to
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.Fx 5.0 .
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@ -23,7 +23,7 @@
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\" $FreeBSD$
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.\"
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.\" TrustedBSD Project - support for POSIX.1e process capabilities
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.\"
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@ -45,7 +45,7 @@ state for use, if permitted.
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.Pp
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A variety of functions are provided for manipulating and managing
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process capability state and working store state:
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.Bl -tag -width cap_get_flagXX
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.Bl -tag -width cap_from_textXX
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.It Fn cap_init
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This function is described in
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.Xr cap_init 3 ,
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@ -63,6 +63,11 @@ and may be used to duplicate a capability structure.
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This function is described in
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.Xr cap_free 3 ,
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and may be used to free a capability structure.
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.It Fn cap_from_text
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This function is described in
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.Xr cap_from_text 3 ,
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and may be used to convert a text-form capability to its internal
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representation.
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.It Fn cap_get_flag
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This function, described in
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.Xr cap_get_flag 3 ,
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@ -81,17 +86,213 @@ in the working store.
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This function, described in
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.Xr cap_set_proc 3 ,
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allows setting of the current process capability state.
|
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.It Fn cap_to_text
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This function, described in
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.Xr cap_to_text 3 ,
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converts a capability from its internal representation to one that is
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(more) readable by humans.
|
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.El
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.Pp
|
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A number of capabilities exist, each mapping to the ability to violate
|
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a particular aspect of the system policy.
|
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Each capability in a capability set has three flags, indicating the
|
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status of the capability with respect to the file or process it is
|
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associated with.
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.Bl -tag -width CAP_INHERITABLEXX
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.It Dv CAP_EFFECTIVE
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If true, the capability will be used as necessary during accesses by
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the process.
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.It Dv CAP_INHERITABLE
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If true, the capability will be passed through
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.Xr execve 2
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invocations as appropriate.
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.It Dv CAP_PERMITTED
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If true, the capability is permitted for the process.
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.El
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.Pp
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Capability inheritence occurs when processes invoke the
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.Xr exec 3
|
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call, resulting in internal invocation of the
|
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.Xr execve 2
|
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system call.
|
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At that time, a processes capabilities are re-evaluated using a set of
|
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fixed algorithms.
|
||||
These algorithms take into account the starting capabilities of the process
|
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and the capabilities of the file being executed.
|
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.Pp
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pI` = pI
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.Pp
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pP` = (fP & X) | (fI & pI)
|
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.Pp
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pE` = (fE & pP`)
|
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.Pp
|
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p[IPE] represent the starting processes inheritted, permitted, and
|
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effective sets.
|
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p'[IPE] represent the new inheritted, permitted, and effective sets.
|
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f[IPE] represent the file's inheritted, permitted, and effective sets.
|
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X represents a global bounding set, currently un-implemented.
|
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.Pp
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The following capabilities are defined and implemented in
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.Fx 5.0 :
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.Pp
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.Bl -tag -width CAP_MAC_RELABEL_SUBJ
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.It Dv CAP_CHOWN
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This capability overrides the restriction that a process cannot change the
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user ID of a file it owns, and the restriction that the group ID supplied in
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the
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.Xr chown 2
|
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function shall be equal to either the group ID or one of the supplementary
|
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group IDs of the calling process.
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.It Dv CAP_DAC_EXECUTE
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This capability overrides file mode execute access restrictions when accessing
|
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an object, and, if
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.Xr posix1e 3
|
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ACLs are available, this capability overrides the ACL execute access
|
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restrictions when accessing an object.
|
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.It Dv CAP_DAC_WRITE
|
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This capability overrides file mode write access restrictions when access an
|
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object, and, if
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.Xr posix1e 3
|
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ACLs are available, this capability also overrides the ACL write access
|
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restrictions when accessing an object.
|
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.It Dv CAP_DAC_READ_SEARCH
|
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This capability overrides file mode read and search access restrictions
|
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when accessing an object, and, if
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.Xr posix1e 3
|
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ACLs are available, this capability overrides the ACL read and search access
|
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restrictions when accessing an object.
|
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.It Dv CAP_FOWNER
|
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This capability overrides the requirements that the user ID associated
|
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with a process be equal to the file owner ID, execpt in the cases where the
|
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CAP_FSETID capability is applicable.
|
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In general, this capability, when effective, permits a process to perform
|
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all the functions that any file owner would have for their files.
|
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.It Dv CAP_FSETID
|
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This capability overrides the following restrictions: that the effective
|
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user ID of the calling process shall match the file owner when setting the
|
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set-user-ID (S_ISUID) and set-group-ID (S_ISGID) bits on the file; that
|
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the effective group ID or one of the supplementary group IDs of the calling
|
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process shall match the group ID of the file when setting the set-group-ID
|
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bit of the file; and that the set-user-ID and set-group-ID bits of the file
|
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mode shall be cleared upon successful return from
|
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.Xr chown 2 .
|
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.It Dv CAP_KILL
|
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Thie capability shall override the restriction that the real or effective
|
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user ID of a process sending a signal must match the real of effective user
|
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ID of the receiving process.
|
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.It Dv CAP_LINK_DIR
|
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This capability is not available on the the FreeBSD platform.
|
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On other platforms, this capabiity overrides the restriction that a process
|
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cannot create or delete a hard link to a directory.
|
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.It Dv CAP_SETFCAP
|
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This capability overrides the restriction that a process cannot
|
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set the file capability state of a file.
|
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.It Dv CAP_SETGID
|
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This capability overrides the restriction in the
|
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.Xr setgid 2
|
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function that a process cannot change its real group ID or change its
|
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effective group ID to a value other than its real group ID.
|
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.It Dv CAP_SETUID
|
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This capability overrides the restriction in the
|
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.Xr setuid 2
|
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function that a process cannot change its real user ID or change its
|
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effective user ID to a value other than the current real user ID.
|
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.It Dv CAP_MAC_DOWNGRADE
|
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This capability override the restriction that no process may downgrade
|
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the MAC label of a file.
|
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.It Dv CAP_MAC_READ
|
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This capability overrides mandatory read access restrictions when accessing
|
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objects.
|
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.It Dv CAP_MAC_RELABEL_SUBJ
|
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This capability overrides the restriction that a process may not modify
|
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its own MAC label.
|
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.It Dv CAP_MAC_UPGRADE
|
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This capability overrides the restriction that no process may upgrade the
|
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MAC label of a file.
|
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.It Dv CAP_MAC_WRITE
|
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This capability overrides the mandatory write access restrictions when
|
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accessing objects.
|
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.It Dv CAP_AUDIT_CONTROL
|
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This capability overrides the restriction that a process cannot modify
|
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audit control parameters.
|
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.It Dv CAP_AUDIT_WRITE
|
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This capability overrides the restriction that a process cannot write data
|
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into the system audit trail.
|
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.It Dv CAP_SETPCAP
|
||||
This capability overrides the restriction that a process cannot expand its
|
||||
capability set when invoking
|
||||
.Xr cap_set_proc 3 .
|
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.It Dv CAP_SYS_SETFFLAG
|
||||
This capability overrides the restriction that a process cannot manipulate
|
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the system file flags on a file system object.
|
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For portability, equivilent to
|
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.Dv CAP_LINUX_IMMUTABLE .
|
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.It Dv CAP_NET_BIND_SERVICE
|
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This capability overrides network namespace restrictions on process's
|
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using the
|
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.Xr bind 2
|
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system call.
|
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For example, this capability, when effective, can be used by a process to
|
||||
bind a port number below 1024 in the IPv4 or IPv6 port spaces.
|
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.It Dv CAP_NET_BROADCAST
|
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.It Dv CAP_NET_ADMIN
|
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.It Dv CAP_NET_RAW
|
||||
This capability overrides the restriction that a process cannot create a
|
||||
raw socket.
|
||||
.It Dv CAP_IPC_LOCK
|
||||
.It Dv CAP_IPC_OWNER
|
||||
.It Dv CAP_SYS_MODULE
|
||||
This capability overrides the restriction that a process cannot load or
|
||||
unload kernel modules.
|
||||
.It Dv CAP_SYS_RAWIO
|
||||
.It Dv CAP_SYS_CHROOT
|
||||
This capability overrides the restriction that a process cannot invoke the
|
||||
.Xr chroot 2
|
||||
or
|
||||
.Xr jail 2
|
||||
system calls.
|
||||
.It Dv CAP_SYS_PTRACE
|
||||
This capability overrides the restriction that a process can only invoke
|
||||
the
|
||||
.Xr ptrace 2
|
||||
system call to debug another process if the target process has identical
|
||||
real and effective user IDs.
|
||||
.It Dv CAP_SYS_PACCT
|
||||
This capability overrides the restriction that a process cannot enable,
|
||||
configure, or disable system process accounting.
|
||||
.It Dv CAP_SYS_ADMIN
|
||||
.It Dv CAP_SYS_BOOT
|
||||
This capability overrides the restriction that a process cannot invoke
|
||||
the
|
||||
.Xr boot 2
|
||||
system call.
|
||||
.It Dv CAP_SYS_NICE
|
||||
This capability overrides the restrictions that a process cannot use the
|
||||
.Xr setpriority 2
|
||||
system call to decrease the priority to below that of itself, or modify the
|
||||
priority of another process.
|
||||
.It Dv CAP_SYS_RESOURCE
|
||||
This capability overrides restrictions on how a process may modify its
|
||||
soft and hard resource limits.
|
||||
.It Dv CAP_SYS_TIME
|
||||
This capability overrides the restriction that a process may not modify the
|
||||
system date and time.
|
||||
.It Dv CAP_SYS_TTY_CONFIG
|
||||
.It Dv CAP_MKNOD
|
||||
This capability overrides the restriction that a process may not create
|
||||
device nodes.
|
||||
.El
|
||||
.Pp
|
||||
Documentation of the internal kernel interfaces backing these calls may
|
||||
be found in
|
||||
.Xr cap 9 .
|
||||
The syscalls between the internal interfaces and the public library
|
||||
The system calls between the internal interfaces and the public library
|
||||
routines may change over time, and as such are not documented. They are
|
||||
not intended to be called directly without going through the library.
|
||||
.Sh IMPLEMENTATION NOTES
|
||||
FreeBSD's support for POSIX.1e interfaces and features is still under
|
||||
development at this time.
|
||||
Support for POSIX.1e interfaces and features in
|
||||
.Fx
|
||||
is still under development at this time.
|
||||
.Pp
|
||||
POSIX.1e assigns security labels to all objects, extending the security
|
||||
functionality described in POSIX.1. These additional labels provide
|
||||
@ -129,5 +330,11 @@ POSIX.1e support was introduced in
|
||||
and development continues.
|
||||
.Sh AUTHORS
|
||||
.An Robert N M Watson
|
||||
.An Ilmar S Habibulin
|
||||
.Sh BUGS
|
||||
These features are not yet included in the base FreeBSD distribution.
|
||||
While
|
||||
.Xr posix1e 3
|
||||
is fully implemented, supporting kernel code is not yet available in the
|
||||
base distribution.
|
||||
It is slated for inclusion prior to
|
||||
.Fx 5.0 .
|
||||
|
||||
Loading…
Reference in New Issue
Block a user