Subject: [PATCH iproute2 v1] Drop capabilities if not running ip exec vrf with libcap

From: Luca Boccassi <[email-masked]>
Date: Tue, 27 Mar 2018 18:48:55 +0100

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 <[email-masked]>
---

Changes since RFC: moved drop_cap to lib/util.c to call it from
ipvrf.c after vrf_switch, which is the function that requires the
additional permissions, has finished.

 configure         | 17 +++++++++++++++++
 include/utils.h   |  2 ++
 ip/ip.c           | 12 ++++++++++++
 ip/ipvrf.c        |  2 ++
 lib/utils.c       | 21 +++++++++++++++++++++
 man/man8/ip-vrf.8 |  8 ++++++++
 6 files changed, 62 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/include/utils.h b/include/utils.h
index 0394268e..e7bffe8a 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -299,4 +299,6 @@ size_t strlcpy(char *dst, const char *src, size_t size);
 size_t strlcat(char *dst, const char *src, size_t size);
 #endif
 
+void drop_cap(void);
+
 #endif /* __UTILS_H__ */
diff --git a/ip/ip.c b/ip/ip.c
index e0cd96cb..e716fed8 100644
--- a/ip/ip.c
+++ b/ip/ip.c
@@ -174,6 +174,18 @@ 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/ip/ipvrf.c b/ip/ipvrf.c
index f9277e1e..8a6b7f97 100644
--- a/ip/ipvrf.c
+++ b/ip/ipvrf.c
@@ -436,6 +436,8 @@ out2:
 out:
 	free(mnt);
 
+	drop_cap();
+
 	return rc;
 }
 
diff --git a/lib/utils.c b/lib/utils.c
index eba4fa74..d20cc594 100644
--- a/lib/utils.c
+++ b/lib/utils.c
@@ -30,6 +30,9 @@
 #include <time.h>
 #include <sys/time.h>
 #include <errno.h>
+#ifdef HAVE_LIBCAP
+#include <sys/capability.h>
+#endif
 
 #include "rt_names.h"
 #include "utils.h"
@@ -1482,3 +1485,21 @@ size_t strlcat(char *dst, const char *src, size_t size)
 	return dlen + strlcpy(dst + dlen, src, size - dlen);
 }
 #endif
+
+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
+}
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