POSIX permission mapping and NULL SIDs

Fri Jun 24 23:51:00 GMT 2016

On 6/24/16, 3:53 PM, "cygwin-owner@cygwin.com on behalf of Bill
Zissimopoulos" <cygwin-owner@cygwin.com on behalf of
billziss@navimatics.com> wrote:
>One caveat is that Cygwin already maps S-1-5-7 to uid 7. So does that mean
>that 7==nobody in Cygwin’s case?

Here is output from Cygwin/SSHFS after mapping “nobody/nogroup” to S-1-5-7:
<<
billziss@windows:~$ cd /cygdrive/y
billziss@windows:/cygdrive/y$ ls -la
total 8
drwxr-xr-x 1 billziss ANONYMOUS LOGON 0 Jun 23 23:57 .
dr-xr-xr-x 1 billziss None 0 Jun 24 15:56 ..
-rw-r--r-- 1 billziss ANONYMOUS LOGON 15 Jun 23 23:57 Foo.txt
billziss@windows:/cygdrive/y$ cacls Foo.txt /S
Y:\Foo.txt 
"D:P(A;;0x1f019f;;;S-1-5-21-383059176-2062642591-2866287538-1001)(A;;FR;;;A
N)(A;;FR;;;WD)"
billziss@windows:/cygdrive/y$ ls -lna
total 8
drwxr-xr-x 1 197609 7 0 Jun 23 23:57 .
dr-xr-xr-x 1 197609 197121 0 Jun 24 15:58 ..
-rw-r--r-- 1 197609 7 15 Jun 23 23:57 Foo.txt
billziss@windows:/cygdrive/y$
>>
Opinions?
Bill