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Don't allow LD_* env. variables to be tricked

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Submitted by: Sam Hartman <hartmans@mit.edu>
This commit is contained in:
Andrey A. Chernov 1995-10-20 17:16:58 +00:00
parent 661314a761
commit b6369ff12e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=11590
2 changed files with 50 additions and 6 deletions
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28
eBones/libexec/telnetd/sys_term.c
View file

@ -32,7 +32,7 @@
*/
#ifndef lint
static char sccsid[] = "@(#)sys_term.c 8.4 (Berkeley) 5/30/95";
static char sccsid[] = "@(#)sys_term.c 8.4+1 (Berkeley) 5/30/95";
#endif /* not lint */
#include "telnetd.h"
@ -1581,10 +1581,12 @@ start_login(host, autologin, name)
utmpx.ut_id[3] = SC_WILDC;
utmpx.ut_type = LOGIN_PROCESS;
(void) time(&utmpx.ut_tv.tv_sec);
if (pututxline(&utmpx) == NULL)
fatal(net, "pututxline failed");
if (makeutx(&utmpx) == NULL)
fatal(net, "makeutx failed");
#endif
scrub_env();
/*
* -h : pass on name of host.
* WARNING: -h is accepted by login if and only if
@ -1820,6 +1822,26 @@ addarg(argv, val)
}
#endif /* NEWINIT */
/*
* scrub_env()
*
* Remove a few things from the environment that
* don't need to be there.
*/
scrub_env()
{
register char **cpp, **cpp2;
for (cpp2 = cpp = environ; *cpp; cpp++) {
if (!strncmp(*cpp, "LD_", 3) &&
!strncmp(*cpp, "_RLD_", 5) &&
!strncmp(*cpp, "LIBPATH=", 8) &&
!strncmp(*cpp, "IFS=", 4))
*cpp2++ = *cpp;
}
*cpp2 = 0;
}
/*
* cleanup()
*

28
secure/libexec/telnetd/sys_term.c
View file

@ -32,7 +32,7 @@
*/
#ifndef lint
static char sccsid[] = "@(#)sys_term.c 8.4 (Berkeley) 5/30/95";
static char sccsid[] = "@(#)sys_term.c 8.4+1 (Berkeley) 5/30/95";
#endif /* not lint */
#include "telnetd.h"
@ -1581,10 +1581,12 @@ start_login(host, autologin, name)
utmpx.ut_id[3] = SC_WILDC;
utmpx.ut_type = LOGIN_PROCESS;
(void) time(&utmpx.ut_tv.tv_sec);
if (pututxline(&utmpx) == NULL)
fatal(net, "pututxline failed");
if (makeutx(&utmpx) == NULL)
fatal(net, "makeutx failed");
#endif
scrub_env();
/*
* -h : pass on name of host.
* WARNING: -h is accepted by login if and only if
@ -1820,6 +1822,26 @@ addarg(argv, val)
}
#endif /* NEWINIT */
/*
* scrub_env()
*
* Remove a few things from the environment that
* don't need to be there.
*/
scrub_env()
{
register char **cpp, **cpp2;
for (cpp2 = cpp = environ; *cpp; cpp++) {
if (!strncmp(*cpp, "LD_", 3) &&
!strncmp(*cpp, "_RLD_", 5) &&
!strncmp(*cpp, "LIBPATH=", 8) &&
!strncmp(*cpp, "IFS=", 4))
*cpp2++ = *cpp;
}
*cpp2 = 0;
}
/*
* cleanup()
*