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Deny access to network users #29

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40 changes: 37 additions & 3 deletions src/win.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -221,7 +221,9 @@ pub struct SecurityAttributes {
impl SecurityAttributes {
/// New default security attributes.
pub fn empty() -> SecurityAttributes {
SecurityAttributes { attributes: None }
let attributes = SecurityAttributes { attributes: None };
attributes.allow_everyone_connect().unwrap();
attributes
}

/// New default security attributes that allow everyone to connect.
Expand Down Expand Up @@ -286,6 +288,30 @@ impl Sid {
}
}

fn network_sid() -> io::Result<Sid> {
let mut sid_ptr = ptr::null_mut();
let result = unsafe {
AllocateAndInitializeSid(
SECURITY_NT_AUTHORITY.as_mut_ptr() as *mut _,
1,
SECURITY_NETWORK_RID,
0,
0,
0,
0,
0,
0,
0,
&mut sid_ptr,
)
};
if result == 0 {
Err(io::Error::last_os_error())
} else {
Ok(Sid { sid_ptr })
}
}

// Unsafe - the returned pointer is only valid for the lifetime of self.
unsafe fn as_ptr(&self) -> PSID {
self.sid_ptr
Expand Down Expand Up @@ -448,15 +474,23 @@ impl InnerAttributes {

fn allow_everyone(permissions: u32) -> io::Result<InnerAttributes> {
let mut attributes = Self::empty()?;
let sid = Sid::everyone_sid()?;

// Deny access to NT AUTHORITY\NETWORK
let sid = Sid::network_sid()?;
let mut network_ace = AceWithSid::new(&sid, TRUSTEE_IS_WELL_KNOWN_GROUP);
network_ace
.set_access_mode(DENY_ACCESS)
.set_access_permissions(permissions)
.allow_inheritance(false as u32);

let sid = Sid::everyone_sid()?;
let mut everyone_ace = AceWithSid::new(&sid, TRUSTEE_IS_WELL_KNOWN_GROUP);
everyone_ace
.set_access_mode(SET_ACCESS)
.set_access_permissions(permissions)
.allow_inheritance(false as u32);

let mut entries = vec![everyone_ace];
let mut entries = vec![network_ace, everyone_ace];
attributes.acl = Acl::new(&mut entries)?;
attributes.descriptor.set_dacl(&attributes.acl)?;

Expand Down