Date: Tue, 12 Oct 1999 13:20:57 +0200 From: Sheldon Hearn <sheldonh@uunet.co.za> To: Huidae Cho <hdcho@unix.knu.ac.kr> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: FTP incoming Message-ID: <97822.939727257@axl.noc.iafrica.com> In-Reply-To: Your message of "Tue, 12 Oct 1999 14:59:37 %2B0900." <199910120559.OAA17721@unix.knu.ac.kr>
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On Tue, 12 Oct 1999 14:59:37 +0900, Huidae Cho wrote:
> i want to prevent anonymous users from removing files in incoming dir.
>
> i set sticky bit to incoming dir. however, it didn't work at all.
>
> how can i do?
You should get away with this untested diff. :-)
Ciao,
Sheldon.
PS: The diff may not apply cleanly to your sources, because you didn't
tell us which version of FreeBSD you're using.
Index: ftpd.c
===================================================================
RCS file: /home/ncvs/src/libexec/ftpd/ftpd.c,v
retrieving revision 1.59
diff -u -d -5 -r1.59 ftpd.c
--- ftpd.c 1999/09/19 22:05:29 1.59
+++ ftpd.c 1999/10/12 11:19:19
@@ -1912,12 +1912,39 @@
void
delete(name)
char *name;
{
struct stat st;
+ char *dir, *p;
+ int l;
LOGCMD("delete", name);
+ if (guest) {
+ p = strrchr(name, '/');
+ if (p == NULL) {
+ dir = ".";
+ } else if (p == name) {
+ dir = "/";
+ } else if (p == name + strlen(name) - 1) {
+ dir = NULL;
+ } else {
+ l = p - name + 1;
+ dir = (char *)malloc(l + 1);
+ strncpy(dir, name, l);
+ dir[l] = '\0';
+ }
+ if (dir != NULL) {
+ if (stat(dir, &st) < 0) {
+ perror_reply(550, dir);
+ return;
+ } else if (st.st_mode&S_ISVTX) {
+ errno = EPERM;
+ perror_reply(550, name);
+ return;
+ }
+ }
+ }
if (stat(name, &st) < 0) {
perror_reply(550, name);
return;
}
if ((st.st_mode&S_IFMT) == S_IFDIR) {
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