Message-Id: <20180327162419.8962-1-bluca@debian.org>
Date:   Tue, 27 Mar 2018 17:24:19 +0100
From:   Luca Boccassi <bluca@...ian.org>
To:     netdev@...r.kernel.org
Cc:     dsahern@...il.com, luto@...capital.net, stephen@...workplumber.org,
        Luca Boccassi <bluca@...ian.org>
Subject: [RFC PATCH iproute2] Drop capabilities if not running ip exec vrf with libcap

ip vrf exec requires root or CAP_NET_ADMIN, CAP_SYS_ADMIN and
CAP_DAC_OVERRIDE. It is not possible to run unprivileged commands like
ping as non-root or non-cap-enabled due to this requirement.
To allow users and administrators to safely add the required
capabilities to the binary, drop all capabilities on start if not
invoked with "vrf exec".
Update the manpage with the requirements.

Signed-off-by: Luca Boccassi <bluca@...ian.org>
---

I'd like to be able to run ip vrf exec as a normal user, does this approach
sound sensible? Any concerns? Are there any other alternatives?
It would be up to each user/admin/whatever to make sure the program is
built with libcap and to add the capabilities manually, so nothing will be
there by default.

 configure         | 17 +++++++++++++++++
 ip/ip.c           | 34 ++++++++++++++++++++++++++++++++++
 man/man8/ip-vrf.8 |  8 ++++++++
 3 files changed, 59 insertions(+)

diff --git a/configure b/configure
index f7c2d7a7..5ef5cd4c 100755
--- a/configure
+++ b/configure
@@ -336,6 +336,20 @@ EOF
     rm -f $TMPDIR/strtest.c $TMPDIR/strtest
 }
 
+check_cap()
+{
+	if ${PKG_CONFIG} libcap --exists
+	then
+		echo "HAVE_CAP:=y" >>$CONFIG
+		echo "yes"
+
+		echo 'CFLAGS += -DHAVE_LIBCAP' `${PKG_CONFIG} libcap --cflags` >>$CONFIG
+		echo 'LDLIBS +=' `${PKG_CONFIG} libcap --libs` >> $CONFIG
+	else
+		echo "no"
+	fi
+}
+
 quiet_config()
 {
 	cat <<EOF
@@ -410,6 +424,9 @@ check_berkeley_db
 echo -n "need for strlcpy: "
 check_strlcpy
 
+echo -n "libcap support: "
+check_cap
+
 echo >> $CONFIG
 echo "%.o: %.c" >> $CONFIG
 echo '	$(QUIET_CC)$(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<' >> $CONFIG
diff --git a/ip/ip.c b/ip/ip.c
index e0cd96cb..49739571 100644
--- a/ip/ip.c
+++ b/ip/ip.c
@@ -17,6 +17,10 @@
 #include <netinet/in.h>
 #include <string.h>
 #include <errno.h>
+#include <sys/types.h>
+#ifdef HAVE_LIBCAP
+#include <sys/capability.h>
+#endif
 
 #include "SNAPSHOT.h"
 #include "utils.h"
@@ -68,6 +72,24 @@ static int do_help(int argc, char **argv)
 	return 0;
 }
 
+static void drop_cap(void)
+{
+#ifdef HAVE_LIBCAP
+	/* don't harmstring root/sudo */
+	if (getuid() != 0 && geteuid() != 0) {
+		cap_t capabilities;
+		capabilities = cap_get_proc();
+		if (!capabilities)
+			exit(EXIT_FAILURE);
+		if (cap_clear(capabilities) != 0)
+			exit(EXIT_FAILURE);
+		if (cap_set_proc(capabilities) != 0)
+			exit(EXIT_FAILURE);
+		cap_free(capabilities);
+	}
+#endif
+}
+
 static const struct cmd {
 	const char *cmd;
 	int (*func)(int argc, char **argv);
@@ -174,6 +196,18 @@ int main(int argc, char **argv)
 	char *batch_file = NULL;
 	int color = 0;
 
+	/* to run vrf exec without root, capabilities might be set, drop them
+	 * if not needed as the first thing.
+	 * execv will drop them for the child command.
+	 * vrf exec requires:
+	 * - cap_dac_override to create the cgroup subdir in /sys
+	 * - cap_sys_admin to load the BPF program
+	 * - cap_net_admin to set the socket into the cgroup
+	 */
+	if (argc < 3 || strcmp(argv[1], "vrf") != 0 ||
+			strcmp(argv[2], "exec") != 0)
+		drop_cap();
+
 	basename = strrchr(argv[0], '/');
 	if (basename == NULL)
 		basename = argv[0];
diff --git a/man/man8/ip-vrf.8 b/man/man8/ip-vrf.8
index 18789339..1a42cebe 100644
--- a/man/man8/ip-vrf.8
+++ b/man/man8/ip-vrf.8
@@ -63,6 +63,14 @@ a VRF other than the default VRF (main table). A command can be run against
 the default VRF by passing the "default" as the VRF name. This is useful if
 the current shell is associated with another VRF (e.g, Management VRF).
 
+This command requires the system to be booted with cgroup v2 (e.g. with systemd,
+add systemd.unified_cgroup_hierarchy=1 to the kernel command line).
+
+This command also requires to be ran as root or with the CAP_SYS_ADMIN,
+CAP_NET_ADMIN and CAP_DAC_OVERRIDE capabilities. If built with libcap and if
+capabilities are added to the ip binary program via setcap, the program will
+drop them as the first thing when invoked, unless the command is vrf exec.
+
 .TP
 .B ip vrf identify [PID] - Report VRF association for process
 .sp
-- 
2.14.2

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