[git commit] setpriv: new applet
Denys Vlasenko
vda.linux at googlemail.com
Wed Jun 14 09:46:52 UTC 2017
commit: https://git.busybox.net/busybox/commit/?id=62d1e98fbd0cc1b008237411d8b2ddc20d3e55a7
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master
Add a minimal 'setpriv' implementation supporting the NO_NEW_PRIVS bit.
Typical usage:
$ busybox setpriv sudo uname
Linux
$ busybox setpriv --nnp sudo uname
sudo: effective uid is not 0, is /usr/bin/sudo on a file system with
the 'nosuid' option set or an NFS file system without root privileges?
function old new delta
packed_usage 31580 31685 +105
setpriv_main - 87 +87
prctl - 53 +53
static.setpriv_longopts - 22 +22
applet_names 2620 2628 +8
applet_main 1516 1520 +4
------------------------------------------------------------------------------
(add/remove: 5/0 grow/shrink: 3/0 up/down: 279/0) Total: 279 bytes
Signed-off-by: Assaf Gordon <assafgordon at gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
util-linux/setpriv.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 73 insertions(+)
diff --git a/util-linux/setpriv.c b/util-linux/setpriv.c
new file mode 100644
index 0000000..6bd663b
--- /dev/null
+++ b/util-linux/setpriv.c
@@ -0,0 +1,73 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * setpriv implementation for busybox based on linux-utils-ng 2.29
+ *
+ * Copyright (C) 2017 by <assafgordon at gmail.com>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ *
+ */
+//config:config SETPRIV
+//config: bool "setpriv"
+//config: default y
+//config: select PLATFORM_LINUX
+//config: select LONG_OPTS
+//config: help
+//config: Run a program with different Linux privilege settings.
+//config: Requires kernel >= 3.5
+
+//applet:IF_SETPRIV(APPLET(setpriv, BB_DIR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_SETPRIV) += setpriv.o
+
+//usage:#define setpriv_trivial_usage
+//usage: "[OPTIONS] PROG [ARGS]"
+//usage:#define setpriv_full_usage "\n\n"
+//usage: "Run PROG with different privilege settings\n"
+//usage: "\n--nnp,--no-new-privs Ignore setuid/setgid bits and file capabilities"
+
+//setpriv from util-linux 2.28:
+// -d, --dump show current state (and do not exec anything)
+// --nnp, --no-new-privs disallow granting new privileges
+// --inh-caps <caps,...> set inheritable capabilities
+// --bounding-set <caps> set capability bounding set
+// --ruid <uid> set real uid
+// --euid <uid> set effective uid
+// --rgid <gid> set real gid
+// --egid <gid> set effective gid
+// --reuid <uid> set real and effective uid
+// --regid <gid> set real and effective gid
+// --clear-groups clear supplementary groups
+// --keep-groups keep supplementary groups
+// --groups <group,...> set supplementary groups
+// --securebits <bits> set securebits
+// --selinux-label <label> set SELinux label
+// --apparmor-profile <pr> set AppArmor profile
+
+#include <sys/prctl.h>
+#include "libbb.h"
+
+#ifndef PR_SET_NO_NEW_PRIVS
+#define PR_SET_NO_NEW_PRIVS 38
+#endif
+
+int setpriv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int setpriv_main(int argc UNUSED_PARAM, char **argv)
+{
+ static const char setpriv_longopts[] ALIGN1 =
+ "nnp\0" No_argument "\xff"
+ "no-new-privs\0" No_argument "\xff"
+ ;
+ int opts;
+
+ opt_complementary = "-1";
+ applet_long_options = setpriv_longopts;
+ opts = getopt32(argv, "");
+ if (opts) {
+ if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0))
+ bb_simple_perror_msg_and_die("prctl: NO_NEW_PRIVS");
+ }
+
+ argv += optind;
+ BB_EXECVP_or_die(argv);
+}
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