[stunnel-users] stunnel-4.15 doesn't work on Mac OS X 10.4.6

Tue Apr 18 03:10:06 CEST 2006

Hi Mike,

I make sure that your patch works fine, and there are no other
problems.

Thank you for the rapid fix!

Regrads,
----------
Internet Initiative Japan Inc.
Research & Development Section,
Product Development Division,
SEIL Business Unit

SUENAGA Hiroki <hsuenaga at iij.ad.jp>

From: Michal Trojnara <Michal.Trojnara at mobi-com.net>
Subject: Re: [stunnel-users] stunnel-4.15 doesn't work on Mac OS X 10.4.6
Date: Mon, 17 Apr 2006 20:49:55 +0200

> Thank you.  Here is the patch:
> ftp://ftp.mirt.net/stunnel/fdputline.patch
> 
> Best regards,
>      Mike
> 
> On 2006-04-17, at 14:47, SUENAGA Hiroki wrote:
> 
> > Dear all,
> >
> > I found a problem that the stunnel-4.15 doesn't work on
> > the Mac OS X 10.4.6. I think this is a BUG.
> >
> > My environment is:
> >
> >   - OS: Mac OS X 10.4.6/Intel
> >   - Compiler: gcc 4.0.1 (from XCode 2.2)
> >   - OpenSSL: 0.9.7i (Mac OS X original version)
> >   - Usage: connect to the submission port.
> >
> > The detail of BUG is the following:
> >
> > In protocol.c::smtp_client() line 138, fdputline() called with
> > argument line = "EHLO localhost." This is a string literal.
> >
> >   130 static void smtp_client(CLI *c) {
> >   ...
> >   138     fdputline(c, c->remote_fd.fd, "EHLO localhost");
> >   ...
> >
> > In network.c::fdputline() line 565, the literal is passed to
> > 1st argument of safeconcat().
> >
> >   556 void fdputline(CLI *c, int fd, char *line) {
> >   ....
> >   565     safeconcat(line, crlf);
> >   ...
> >
> > In common.h line 311, safeconcat() is #define'ed as:
> >
> >   311 #define safeconcat(dst, src) \
> >   312     (dst[STRLEN-1]='\0', strncat((dst), (src), \
> >            STRLEN-strlen(dst)-1))
> >
> > This means the macro safeconcat() write to string literal.
> > This is the BUG. In Mac OS X envoronment, string literal is
> > NOT writable. So protection fault occurs at this code.
> > On the other environment, this breaks somewhere in the heap
> > or in the stack. This may also cause a crash.
> >
> > In stunnel-4.14, fdprintf() is used instead of fdputline().
> > fdprint() have own writable buffers on stack, and the string
> > literal is copied to the stack. This works fine.
> >
> > The work around is using own writable buffers in fdputline()
> > like fdprint() in stunnel-4.14. But it seems to be a performance
> > tuning why fdputline() is used. So I don't know what is the
> > correct way to fix this BUG....
> >
> > I hope this BUG is fixed in the future release.
> > If this was already reported,  please ignore this mail.
> > Thank you.
> >
> > Rgards,
> >
> > ----------
> > Internet Initiative Japan Inc.
> > Research & Development Section,
> > Product Development Division,
> > SEIL Business Unit
> >
> > SUENAGA Hiroki <hsuenaga at iij.ad.jp>
> > _______________________________________________
> > stunnel-users mailing list
> > stunnel-users at mirt.net
> > http://stunnel.mirt.net/mailman/listinfo/stunnel-users
> 
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