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#!/usr/bin/python3
# ------------------------------------------------------------------
#
# Copyright (C) 2010-2011 Canonical Ltd.
# Copyright (C) 2020 Christian Boltz
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 2 of the GNU General Public
# License published by the Free Software Foundation.
#
# ------------------------------------------------------------------
from testlib import write_file
prefix = "simple_tests/generated_x"
prefix_leading = "simple_tests/generated_perms_leading"
prefix_safe = "simple_tests/generated_perms_safe"
trans_types = ("p", "P", "c", "C", "u", "i")
modifiers = ("i", "u")
trans_modifiers = {
"p": modifiers,
"P": modifiers,
"c": modifiers,
"C": modifiers,
}
targets = ("", "target", "target2")
# null_target uses "_" instead of "" because "" gets skipped in some for loops. Replace with "" when actually using the value.
null_target = ("_",)
named_trans = {
"p": targets,
"P": targets,
"c": targets,
"C": targets,
"u": null_target,
"i": null_target,
}
safe_map = {
"p": "unsafe",
"P": "safe",
"c": "unsafe",
"C": "safe",
"u": "",
"i": "",
}
invert_safe = {
"safe": "unsafe",
"unsafe": "safe",
'': '',
}
# audit qualifier disabled for now it really shouldn't affect the conflict
# test but it may be worth checking every once in awhile
# qualifiers = ("", "owner", "audit", "audit owner")
qualifiers = ("", "owner")
count = 0
def gen_list():
output = []
for trans in trans_types:
if trans in trans_modifiers:
for mod in trans_modifiers[trans]:
output.append("{}{}x".format(trans, mod))
output.append("{}x".format(trans))
return output
def test_gen_list():
"""test if gen_list returns the expected output"""
expected = "pix pux px Pix Pux Px cix cux cx Cix Cux Cx ux ix".split()
actual = gen_list()
if actual != expected:
raise Exception("gen_list produced unexpected result, expected {}, got {}".format(expected, actual))
def build_rule(leading, qual, name, perm, target):
rule = ''
if leading:
rule += "\t{} {} {}".format(qual, perm, name)
else:
rule += "\t{} {} {}".format(qual, name, perm)
if target:
rule += " -> {}".format(target)
rule += ",\n"
return rule
def gen_file(name, xres, leading1, qual1, rule1, perm1, target1, leading2, qual2, rule2, perm2, target2):
global count
count += 1
content = ''
content += "#\n"
content += "#=DESCRIPTION {}\n".format(name)
content += "#=EXRESULT {}\n".format(xres)
content += "#\n"
content += "/usr/bin/foo {\n"
content += build_rule(leading1, qual1, rule1, perm1, target1)
content += build_rule(leading2, qual2, rule2, perm2, target2)
content += "}\n"
write_file('', name, content)
# NOTE: currently we don't do px to cx, or cx to px conversion
# so
# /foo {
# /* px -> /foo//bar,
# /* cx -> bar,
#
# will conflict
#
# NOTE: conflict tests don't test leading permissions or using unsafe keywords
# It is assumed that there are extra tests to verify 1 to 1 correspondance
def gen_files(name, rule1, rule2, default):
perms = gen_list()
for i in perms:
for t in named_trans[i[0]]:
if t == '_':
t = ''
for q in qualifiers:
for j in perms:
for u in named_trans[j[0]]:
if u == '_':
u = ''
for r in qualifiers:
file = prefix + '/' + name + '-' + q + i + t + '-' + r + j + u + '.sd'
# override failures when transitions are the same
xres = default
if (i == j and t == u):
xres = "PASS"
gen_file(file, xres, 0, q, rule1, i, t, 0, r, rule2, j, u)
def gen_conflicting_x():
gen_files("conflict", "/bin/cat", "/bin/cat", "FAIL")
def gen_overlap_re_exact():
gen_files("exact", "/bin/cat", "/bin/*", "PASS")
# we currently don't support this, once supported change to "PASS"
def gen_dominate_re_re():
gen_files("dominate", "/bin/*", "/bin/**", "FAIL")
def gen_ambiguous_re_re():
gen_files("ambiguous", "/bin/a*", "/bin/*b", "FAIL")
# test that rules that lead with permissions don't conflict with
# the same rule using trailing permissions.
def gen_leading_perms(name, rule1, rule2):
perms = gen_list()
for i in perms:
for t in named_trans[i[0]]:
if t == '_':
t = ''
for q in qualifiers:
file = prefix_leading + '/' + name + '-' + q + i + t + ".sd"
gen_file(file, "PASS", 0, q, rule1, i, t, 1, q, rule2, i, t)
# test for rules with leading safe or unsafe keywords.
# check they are equivalent to their counterpart,
# or if $invert that they properly conflict with their counterpart
def gen_safe_perms(name, xres, invert, rule1, rule2):
perms = gen_list()
for i in perms:
for t in named_trans[i[0]]:
if t == '_':
t = ''
for q in qualifiers:
qual = safe_map[i[0]]
if invert:
qual = invert_safe[qual]
if (not invert or qual):
file = prefix_safe + '/' + name + '-' + invert + '-' + q + qual + '-' + 'rule-' + i + t + '.sd'
gen_file(file, xres, 0, '{} {}'.format(q, qual), rule1, i, t, 1, q, rule2, i, t)
file = prefix_safe + '/' + name + '-' + invert + '-' + q + qual + i + '-' + 'rule-' + t + '.sd'
gen_file(file, xres, 0, q, rule1, i, t, 1, '{} {}'.format(q, qual), rule2, i, t)
test_gen_list()
gen_conflicting_x()
gen_overlap_re_exact()
gen_dominate_re_re()
gen_ambiguous_re_re()
gen_leading_perms("exact", "/bin/cat", "/bin/cat")
gen_leading_perms("exact-re", "/bin/*", "/bin/*")
gen_leading_perms("overlap", "/*", "/bin/cat")
gen_leading_perms("dominate", "/**", "/*")
gen_leading_perms("ambiguous", "/a*", "/*b")
gen_safe_perms("exact", "PASS", "", "/bin/cat", "/bin/cat")
gen_safe_perms("exact-re", "PASS", "", "/bin/*", "/bin/*")
gen_safe_perms("overlap", "PASS", "", "/*", "/bin/cat")
gen_safe_perms("dominate", "PASS", "", "/**", "/*")
gen_safe_perms("ambiguous", "PASS", "", "/a*", "/*b")
gen_safe_perms("exact", "FAIL", "inv", "/bin/cat", "/bin/cat")
gen_safe_perms("exact-re", "FAIL", "inv", "/bin/*", "/bin/*")
gen_safe_perms("overlap", "PASS", "inv", "/*", "/bin/cat")
gen_safe_perms("dominate", "FAIL", "inv", "/**", "/*")
gen_safe_perms("ambiguous", "FAIL", "inv", "/a*", "/*b")
print("Generated {} xtransition interaction tests".format(count))
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