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authorCarsten Haitzler (Rasterman) <raster@rasterman.com>2013-11-30 22:26:30 +0900
committerCarsten Haitzler (Rasterman) <raster@rasterman.com>2013-11-30 22:26:30 +0900
commitbb4a21e98656fe2c7d98ba2163e6defe9a630e2b (patch)
tree7cb4b643760be6b800df0fd9aa327ae188bfaa9c
parentdouble free coverty complaint - it doesn't know the action re-execs (diff)
downloadenlightenment-bb4a21e98656fe2c7d98ba2163e6defe9a630e2b.tar.gz
e_sys - address security concerns with environment and gdb
1. clear out environment as best is possible before executing anything. especially PATH and IFS are set to minimal base defaults. also use clearenv() if available and unsetenv() 2. remove gdb method as it's just too dangerous. run it as normal as the user and if the kernel / distro dny that - then sorry. too bad.
-rw-r--r--configure.ac2
-rw-r--r--data/etc/sysactions.conf.in15
-rw-r--r--src/bin/e_start_main.c3
-rw-r--r--src/bin/e_sys_main.c61
4 files changed, 34 insertions, 47 deletions
diff --git a/configure.ac b/configure.ac
index 859090e10..420fcc099 100644
--- a/configure.ac
+++ b/configure.ac
@@ -73,6 +73,8 @@ EFL_CHECK_PATH_MAX
AC_CHECK_FUNCS(setenv)
AC_CHECK_FUNCS(unsetenv)
+AC_CHECK_FUNCS(clearenv)
+AC_CHECK_HEADERS([features.h])
efl_version="1.8.0"
AC_SUBST(efl_version)
diff --git a/data/etc/sysactions.conf.in b/data/etc/sysactions.conf.in
index eccb4af56..19520ff2c 100644
--- a/data/etc/sysactions.conf.in
+++ b/data/etc/sysactions.conf.in
@@ -43,15 +43,14 @@
# user and group name can use glob matches (* == all for example) like the
# shell. as can action names allowed or denied.
-action: halt @HALT@
-action: reboot @REBOOT@
-action: suspend @SUSPEND@
-action: hibernate @HIBERNATE@
-action: /bin/mount /bin/mount
-action: /bin/umount /bin/umount
+action: halt @HALT@
+action: reboot @REBOOT@
+action: suspend @SUSPEND@
+action: hibernate @HIBERNATE@
+action: /bin/mount /bin/mount
+action: /bin/umount /bin/umount
action: /usr/bin/eject /usr/bin/eject
-action: gdb gdb
-action: l2ping l2ping
+action: l2ping /usr/bin/l2ping
# on FreeBSD use this instead of the above.
#action suspend /usr/sbin/zzz
diff --git a/src/bin/e_start_main.c b/src/bin/e_start_main.c
index 26291556a..64aa5d4c7 100644
--- a/src/bin/e_start_main.c
+++ b/src/bin/e_start_main.c
@@ -567,8 +567,7 @@ main(int argc, char **argv)
{
/* call e_sys gdb */
snprintf(buffer, 4096,
- "%s/enlightenment/utils/enlightenment_sys gdb %i %s/.e-crashdump.txt",
- eina_prefix_lib_get(pfx),
+ "gdb %i %s/.e-crashdump.txt",
child,
home);
r = system(buffer);
diff --git a/src/bin/e_sys_main.c b/src/bin/e_sys_main.c
index baf018bf8..e833dac8e 100644
--- a/src/bin/e_sys_main.c
+++ b/src/bin/e_sys_main.c
@@ -1,5 +1,11 @@
#include "config.h"
+#define __USE_MISC
+#define _SVID_SOURCE
+#ifdef HAVE_FEATURES_H
+# include <features.h>
+#endif
+
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
@@ -53,7 +59,6 @@ main(int argc,
const char *act;
#endif
gid_t gid, gl[65536], egid;
- int pid = 0;
for (i = 1; i < argc; i++)
{
@@ -75,21 +80,6 @@ main(int argc,
test = 1;
action = argv[2];
}
- else if (!strcmp(argv[1], "gdb"))
- {
- if (argc != 4) exit(1);
- char *end = NULL;
-
- action = argv[1];
- pid = strtoul(argv[2], &end, 10);
- if (end == NULL || *end != '\0')
- {
- printf("Invalid pid for '%s'.\n", argv[3]);
- exit(0);
- }
-
- output = argv[3];
- }
else if (!strcmp(argv[1], "l2ping"))
{
action = argv[1];
@@ -161,27 +151,7 @@ main(int argc,
exit(20);
}
- if (!strcmp(action, "gdb"))
- {
- char buffer[4096];
- int r;
-
- snprintf(buffer, 4096,
- "%s --pid=%i "
- "-batch "
- "-ex 'set logging file %s' "
- "-ex 'set logging on' "
- "-ex 'thread apply all backtrace full' "
- "-ex detach > /dev/null 2>&1 < /dev/zero",
- cmd,
- pid,
- output ?: "e-output.txt");
-
- r = system(buffer);
-
- exit(WEXITSTATUS(r));
- }
- else if (!test && !strcmp(action, "l2ping"))
+ if (!test && !strcmp(action, "l2ping"))
{
char tmp[128];
double latency;
@@ -193,6 +163,23 @@ main(int argc,
return (latency < 0) ? 1 : 0;
}
+ /* sanitize environment */
+#ifdef HAVE_UNSETENV
+# define NOENV(x) unsetenv(x)
+#else
+# define NOENV(x)
+#endif
+ NOENV("IFS");
+ NOENV("LD_PRELOAD");
+ NOENV("PYTHONPATH");
+ NOENV("LD_LIBRARY_PATH");
+#ifdef HAVE_CLEARENV
+ clearenv();
+#endif
+ /* set path and ifs to minimal defaults */
+ putenv("PATH=/bin:/usr/bin");
+ putenv("IFS= \t\n");
+
if ((!test)
#ifdef HAVE_EEZE_MOUNT
&& (!mnt)