Mail Security and Locking Problem
rjk at mgweed.UUCP
rjk at mgweed.UUCP
Thu May 26 21:19:14 AEST 1983
The following secure mailing scheme works great for us:
Actual transcript of what happens as user "rjk":
-------------------------------------------------------
$ ls -ld /usr/mail
drwxrwx--x 2 bin mail 960 May 26 09:05 /usr/mail
$ ls -l /usr/mail/rjk
-rw-rw---- 1 rjk mail 417 May 26 09:05 /usr/mail/rjk
$ cat /usr/mail/rjk
>From jfs Thu May 26 09:04:22 1983
To: rjk
Subject: cu
...
$ ls -l /usr/mail/adm
-rw-rw---- 1 adm mail 825 Mar 22 15:30 /usr/mail/adm
$ cat /usr/mail/adm
cat: cannot open /usr/mail/adm
$ ls -l /usr/mail
/usr/mail unreadable
total 2
$ grep MFMODE /usr/src/cmd/mail.c
#define MFMODE 0660 /* create mode for `/usr/mail' files */
--------------------------------------------------------
No one can read anyone else's mail and the locking mechanism works as it
is supposed to.
Randy King
we13!mgweed!rjk
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