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#!/usr/bin/env python
# Unit tests for genseccomp.py
import cStringIO
import textwrap
import unittest
import genseccomp
class TestGenseccomp(unittest.TestCase):
def setUp(self):
genseccomp.set_dir()
def get_config(self, arch):
for i in genseccomp.POLICY_CONFIGS:
if i[0] == arch:
return i
self.fail("No such architecture")
def get_headers(self, arch):
return self.get_config(arch)[1]
def get_switches(self, arch):
return self.get_config(arch)[2]
def test_get_names(self):
bionic = cStringIO.StringIO(textwrap.dedent("""\
int __llseek:_llseek(int, unsigned long, unsigned long, off64_t*, int) arm,mips,x86
int fchown:fchown(int, uid_t, gid_t) arm64,mips,mips64,x86_64
"""))
whitelist = cStringIO.StringIO(textwrap.dedent("""\
ssize_t read(int, void*, size_t) all
"""))
empty = cStringIO.StringIO(textwrap.dedent("""\
"""))
names = genseccomp.get_names([bionic, whitelist, empty], "arm")
bionic.seek(0)
whitelist.seek(0)
empty.seek(0)
names64 = genseccomp.get_names([bionic, whitelist, empty], "arm64")
bionic.seek(0)
whitelist.seek(0)
empty.seek(0)
self.assertIn("fchown", names64)
self.assertNotIn("fchown", names)
self.assertIn("_llseek", names)
self.assertNotIn("_llseek", names64)
self.assertIn("read", names)
self.assertIn("read", names64)
# Blacklist item must be in bionic
blacklist = cStringIO.StringIO(textwrap.dedent("""\
int fchown2:fchown2(int, uid_t, gid_t) arm64,mips,mips64,x86_64
"""))
with self.assertRaises(RuntimeError):
genseccomp.get_names([bionic, whitelist, blacklist], "arm")
bionic.seek(0)
whitelist.seek(0)
blacklist.seek(0)
# Test blacklist item is removed
blacklist = cStringIO.StringIO(textwrap.dedent("""\
int fchown:fchown(int, uid_t, gid_t) arm64,mips,mips64,x86_64
"""))
names = genseccomp.get_names([bionic, whitelist, blacklist], "arm64")
bionic.seek(0)
whitelist.seek(0)
blacklist.seek(0)
self.assertIn("read", names)
self.assertNotIn("fchown", names)
# Blacklist item must not be in whitelist
whitelist = cStringIO.StringIO(textwrap.dedent("""\
int fchown:fchown(int, uid_t, gid_t) arm64,mips,mips64,x86_64
"""))
with self.assertRaises(RuntimeError):
genseccomp.get_names([empty, whitelist, blacklist], "arm")
empty.seek(0)
whitelist.seek(0)
blacklist.seek(0)
# No dups in bionic and whitelist
whitelist = cStringIO.StringIO(textwrap.dedent("""\
int __llseek:_llseek(int, unsigned long, unsigned long, off64_t*, int) arm,mips,x86
"""))
with self.assertRaises(RuntimeError):
genseccomp.get_names([bionic, whitelist, empty], "arm")
bionic.seek(0)
whitelist.seek(0)
empty.seek(0)
def test_convert_names_to_NRs(self):
self.assertEquals(genseccomp.convert_names_to_NRs(["open"],
self.get_headers("arm"),
self.get_switches("arm")),
[("open", 5)])
self.assertEquals(genseccomp.convert_names_to_NRs(["__ARM_NR_set_tls"],
self.get_headers("arm"),
self.get_switches("arm")),
[('__ARM_NR_set_tls', 983045)])
self.assertEquals(genseccomp.convert_names_to_NRs(["openat"],
self.get_headers("arm64"),
self.get_switches("arm64")),
[("openat", 56)])
self.assertEquals(genseccomp.convert_names_to_NRs(["openat"],
self.get_headers("x86"),
self.get_switches("x86")),
[("openat", 295)])
self.assertEquals(genseccomp.convert_names_to_NRs(["openat"],
self.get_headers("x86_64"),
self.get_switches("x86_64")),
[("openat", 257)])
self.assertEquals(genseccomp.convert_names_to_NRs(["openat"],
self.get_headers("mips"),
self.get_switches("mips")),
[("openat", 4288)])
self.assertEquals(genseccomp.convert_names_to_NRs(["openat"],
self.get_headers("mips64"),
self.get_switches("mips64")),
[("openat", 5247)])
def test_convert_NRs_to_ranges(self):
ranges = genseccomp.convert_NRs_to_ranges([("b", 2), ("a", 1)])
self.assertEquals(len(ranges), 1)
self.assertEquals(ranges[0].begin, 1)
self.assertEquals(ranges[0].end, 3)
self.assertItemsEqual(ranges[0].names, ["a", "b"])
ranges = genseccomp.convert_NRs_to_ranges([("b", 3), ("a", 1)])
self.assertEquals(len(ranges), 2)
self.assertEquals(ranges[0].begin, 1)
self.assertEquals(ranges[0].end, 2)
self.assertItemsEqual(ranges[0].names, ["a"])
self.assertEquals(ranges[1].begin, 3)
self.assertEquals(ranges[1].end, 4)
self.assertItemsEqual(ranges[1].names, ["b"])
def test_convert_to_intermediate_bpf(self):
ranges = genseccomp.convert_NRs_to_ranges([("b", 2), ("a", 1)])
bpf = genseccomp.convert_to_intermediate_bpf(ranges)
self.assertEquals(bpf, ['BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 3, {fail}, {allow}), //a|b'])
ranges = genseccomp.convert_NRs_to_ranges([("b", 3), ("a", 1)])
bpf = genseccomp.convert_to_intermediate_bpf(ranges)
self.assertEquals(bpf, ['BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 3, 1, 0),',
'BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 2, {fail}, {allow}), //a',
'BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 4, {fail}, {allow}), //b'])
def test_convert_ranges_to_bpf(self):
ranges = genseccomp.convert_NRs_to_ranges([("b", 2), ("a", 1)])
bpf = genseccomp.convert_ranges_to_bpf(ranges)
self.assertEquals(bpf, ['BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 1, 0, 2),',
'BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 3, 1, 0), //a|b',
'BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),'])
ranges = genseccomp.convert_NRs_to_ranges([("b", 3), ("a", 1)])
bpf = genseccomp.convert_ranges_to_bpf(ranges)
self.assertEquals(bpf, ['BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 1, 0, 4),',
'BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 3, 1, 0),',
'BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 2, 2, 1), //a',
'BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 4, 1, 0), //b',
'BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),'])
def test_convert_bpf_to_output(self):
output = genseccomp.convert_bpf_to_output(["line1", "line2"], "arm")
expected_output = textwrap.dedent("""\
// Autogenerated file - edit at your peril!!
#include <linux/filter.h>
#include <errno.h>
#include "seccomp_bpfs.h"
const sock_filter arm_filter[] = {
line1
line2
};
const size_t arm_filter_size = sizeof(arm_filter) / sizeof(struct sock_filter);
""")
self.assertEquals(output, expected_output)
def test_construct_bpf(self):
syscalls = cStringIO.StringIO(textwrap.dedent("""\
int __llseek:_llseek(int, unsigned long, unsigned long, off64_t*, int) arm,mips,x86
int fchown:fchown(int, uid_t, gid_t) arm64,mips,mips64,x86_64
"""))
whitelist = cStringIO.StringIO(textwrap.dedent("""\
ssize_t read(int, void*, size_t) all
"""))
blacklist = cStringIO.StringIO(textwrap.dedent("""\
"""))
syscall_files = [syscalls, whitelist, blacklist]
output = genseccomp.construct_bpf(syscall_files, "arm", self.get_headers("arm"),
self.get_switches("arm"))
expected_output = textwrap.dedent("""\
// Autogenerated file - edit at your peril!!
#include <linux/filter.h>
#include <errno.h>
#include "seccomp_bpfs.h"
const sock_filter arm_filter[] = {
BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 3, 0, 4),
BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 140, 1, 0),
BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 4, 2, 1), //read
BPF_JUMP(BPF_JMP|BPF_JGE|BPF_K, 141, 1, 0), //_llseek
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
};
const size_t arm_filter_size = sizeof(arm_filter) / sizeof(struct sock_filter);
""")
self.assertEquals(output, expected_output)
if __name__ == '__main__':
unittest.main()
|
