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firewall-util: reject NULL source or address with prefixlen 0

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Make sure we don't add masquerading rules without a explicitly
specified network range we should be masquerading for.

The only caller aside from test case is
networkd-address.c which never passes a NULL source.

As it also passes the network prefix, that should always be > 0 as well.

This causes expected test failure:
Failed to modify firewall: Invalid argument
Failed to modify firewall: Invalid argument
Failed to modify firewall: Invalid argument
Failed to modify firewall: Protocol not available
Failed to modify firewall: Protocol not available
Failed to modify firewall: Protocol not available
Failed to modify firewall: Protocol not available

The failing test cases are amended to expect failure on
NULL source or prefix instead of success.
This commit is contained in:
Florian Westphal 2020-06-24 11:55:14 +02:00
parent 937e305e93
commit 47ed20e1e0
2 changed files with 19 additions and 2 deletions
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3
src/shared/firewall-util.c
View File

@ -98,6 +98,9 @@ int fw_add_masquerade(
if (af != AF_INET)
return -EOPNOTSUPP;
if (!source || source_prefixlen == 0)
return -EINVAL;
h = iptc_init("nat");
if (!h)
return -errno;

18
src/test/test-firewall-util.c
View File

@ -9,16 +9,30 @@
int main(int argc, char *argv[]) {
int r;
test_setup_logging(LOG_DEBUG);
uint8_t prefixlen = 32;
r = fw_add_masquerade(true, AF_INET, NULL, 0);
if (r == 0)
log_error("Expected failure: NULL source");
r = fw_add_masquerade(true, AF_INET, &MAKE_IN_ADDR_UNION(10,1,2,0), 0);
if (r == 0)
log_error("Expected failure: 0 prefixlen");
r = fw_add_masquerade(true, AF_INET, &MAKE_IN_ADDR_UNION(10,1,2,3), prefixlen);
if (r < 0)
log_error_errno(r, "Failed to modify firewall: %m");
r = fw_add_masquerade(true, AF_INET, NULL, 0);
prefixlen = 28;
r = fw_add_masquerade(true, AF_INET, &MAKE_IN_ADDR_UNION(10,0,2,0), prefixlen);
if (r < 0)
log_error_errno(r, "Failed to modify firewall: %m");
r = fw_add_masquerade(false, AF_INET, NULL, 0);
r = fw_add_masquerade(false, AF_INET, &MAKE_IN_ADDR_UNION(10,0,2,0), prefixlen);
if (r < 0)
log_error_errno(r, "Failed to modify firewall: %m");
r = fw_add_masquerade(false, AF_INET, &MAKE_IN_ADDR_UNION(10,1,2,3), 32);
if (r < 0)
log_error_errno(r, "Failed to modify firewall: %m");