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cap_net: CAPNET_CONNECT and CAPNET_CONNECTDNS are not mutually exclusive

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Fix the for the CAPNET_CONNECT and CAPNET_CONNECTDNS.
Add test to ensure that this is possible.
This commit is contained in:
Mariusz Zaborski 2021-01-03 17:10:35 +01:00
parent b7876aec95
commit 34535dace9
2 changed files with 46 additions and 5 deletions
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18
lib/libcasper/services/cap_net/cap_net.c
View File

@ -1058,7 +1058,7 @@ net_connect(const nvlist_t *limits, nvlist_t *nvlin, nvlist_t *nvlout)
const void *saddr;
const nvlist_t *funclimit;
size_t len;
bool conn, conndns;
bool conn, conndns, allowed;
conn = net_allowed_mode(limits, CAPNET_CONNECT);
conndns = net_allowed_mode(limits, CAPNET_CONNECTDNS);
@ -1071,12 +1071,20 @@ net_connect(const nvlist_t *limits, nvlist_t *nvlin, nvlist_t *nvlout)
funclimit = dnvlist_get_nvlist(limits, LIMIT_NV_CONNECT, NULL);
saddr = nvlist_get_binary(nvlin, "saddr", &len);
if (conn && !net_allowed_bsaddr(funclimit, saddr, len)) {
return (ENOTCAPABLE);
} else if (conndns && (capdnscache == NULL ||
!net_allowed_bsaddr_impl(capdnscache, saddr, len))) {
allowed = false;
if (conn && net_allowed_bsaddr(funclimit, saddr, len)) {
allowed = true;
}
if (conndns && capdnscache != NULL &&
net_allowed_bsaddr_impl(capdnscache, saddr, len)) {
allowed = true;
}
if (allowed == false) {
return (ENOTCAPABLE);
}
socket = dup(nvlist_get_descriptor(nvlin, "s"));
if (connect(socket, saddr, len) < 0) {
serrno = errno;

33
lib/libcasper/services/cap_net/tests/net_test.c
View File

@ -1068,6 +1068,38 @@ ATF_TC_BODY(capnet__limits_connect_mode, tc)
cap_close(capnet);
}
ATF_TC_WITHOUT_HEAD(capnet__limits_connect_dns_mode);
ATF_TC_BODY(capnet__limits_connect_dns_mode, tc)
{
cap_channel_t *capnet;
cap_net_limit_t *limit;
capnet = create_network_service();
/* LIMIT */
limit = cap_net_limit_init(capnet, CAPNET_CONNECT | CAPNET_CONNECTDNS);
ATF_REQUIRE(limit != NULL);
ATF_REQUIRE(cap_net_limit(limit) == 0);
/* ALLOWED */
ATF_REQUIRE(test_connect(capnet, TEST_IPV4, 80) == 0);
/* DISALLOWED */
ATF_REQUIRE(
test_gethostbyname(capnet, AF_INET, TEST_DOMAIN_0) == ENOTCAPABLE);
ATF_REQUIRE(test_getnameinfo(capnet, AF_INET, TEST_IPV4) ==
ENOTCAPABLE);
ATF_REQUIRE(test_gethostbyaddr(capnet, AF_INET, TEST_IPV4) ==
ENOTCAPABLE);
ATF_REQUIRE(test_getaddrinfo(capnet, AF_INET, TEST_DOMAIN_0, NULL) ==
ENOTCAPABLE);
ATF_REQUIRE(test_bind(capnet, TEST_BIND_IPV4) == ENOTCAPABLE);
test_extend_mode(capnet, CAPNET_ADDR2NAME);
cap_close(capnet);
}
ATF_TC_WITHOUT_HEAD(capnet__limits_connect);
ATF_TC_BODY(capnet__limits_connect, tc)
{
@ -1238,6 +1270,7 @@ ATF_TP_ADD_TCS(tp)
ATF_TP_ADD_TC(tp, capnet__limits_bind);
ATF_TP_ADD_TC(tp, capnet__limits_connect_mode);
ATF_TP_ADD_TC(tp, capnet__limits_connect_dns_mode);
ATF_TP_ADD_TC(tp, capnet__limits_connect);
ATF_TP_ADD_TC(tp, capnet__limits_connecttodns);