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networkd: add support for prefix allow-list and route allow-list

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This commit is contained in:
Susant Sahani 2020-12-18 20:28:38 +01:00 committed by Yu Watanabe
parent 3f0af4a5f9
commit de6b6ff84c
7 changed files with 58 additions and 19 deletions
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18
man/systemd.network.xml
View File

@ -2100,6 +2100,15 @@ IPv6Token=prefixstable:2002:da8:1::</programlisting></para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>PrefixAllowList=</varname></term>
<listitem>
<para>A whitespace-separated list of IPv6 prefixes. IPv6 prefixes supplied via router
advertisements in the list are allowed. Note that if <varname>PrefixAllowList=</varname> is
configured then <varname>PrefixDenyList=</varname> is ignored.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>RouteDenyList=</varname></term>
<listitem>
@ -2108,6 +2117,15 @@ IPv6Token=prefixstable:2002:da8:1::</programlisting></para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>RouteAllowList=</varname></term>
<listitem>
<para>A whitespace-separated list of IPv6 route prefixes. IPv6 route prefixes supplied via
router advertisements in the list are allowed. Note that if <varname>RouteAllowList=</varname> is
configured then <varname>RouteDenyList=</varname> is ignored.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>DHCPv6Client=</varname></term>
<listitem>

41
src/network/networkd-ndisc.c
View File

@ -69,6 +69,12 @@ void network_adjust_ipv6_accept_ra(Network *network) {
if (network->ipv6_accept_ra < 0)
/* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
network->ipv6_accept_ra = !FLAGS_SET(network->ip_forward, ADDRESS_FAMILY_IPV6);
/* When PrefixAllowList= or RouteAllowList= are specified, then PrefixDenyList= or RouteDenyList= are ignored. */
if (!set_isempty(network->ndisc_allow_listed_prefix))
network->ndisc_deny_listed_prefix = set_free_free(network->ndisc_deny_listed_prefix);
if (!set_isempty(network->ndisc_allow_listed_route_prefix))
network->ndisc_deny_listed_route_prefix = set_free_free(network->ndisc_deny_listed_route_prefix);
}
static int ndisc_remove_old_one(Link *link, const struct in6_addr *router, bool force);
@ -839,12 +845,17 @@ static int ndisc_router_process_route(Link *link, sd_ndisc_router *rt) {
if (r < 0)
return log_link_error_errno(link, r, "Failed to get route address: %m");
if (set_contains(link->network->ndisc_deny_listed_route_prefix, &dst.in6)) {
if ((!set_isempty(link->network->ndisc_allow_listed_route_prefix) &&
!set_contains(link->network->ndisc_allow_listed_route_prefix, &dst.in6)) ||
set_contains(link->network->ndisc_deny_listed_route_prefix, &dst.in6)) {
if (DEBUG_LOGGING) {
_cleanup_free_ char *buf = NULL;
(void) in_addr_to_string(AF_INET6, &dst, &buf);
log_link_debug(link, "Route Prefix '%s' is deny-listed, ignoring", strnull(buf));
if (!set_isempty(link->network->ndisc_allow_listed_route_prefix))
log_link_debug(link, "Route prefix '%s' is not in allow list, ignoring", strnull(buf));
else
log_link_debug(link, "Route prefix '%s' is in deny list, ignoring", strnull(buf));
}
return 0;
}
@ -1096,12 +1107,17 @@ static int ndisc_router_process_options(Link *link, sd_ndisc_router *rt) {
if (r < 0)
return log_link_error_errno(link, r, "Failed to get prefix address: %m");
if (set_contains(link->network->ndisc_deny_listed_prefix, &a.in6)) {
if ((!set_isempty(link->network->ndisc_allow_listed_prefix) &&
!set_contains(link->network->ndisc_allow_listed_prefix, &a.in6)) ||
set_contains(link->network->ndisc_deny_listed_prefix, &a.in6)) {
if (DEBUG_LOGGING) {
_cleanup_free_ char *b = NULL;
(void) in_addr_to_string(AF_INET6, &a, &b);
log_link_debug(link, "Prefix '%s' is deny-listed, ignoring", strna(b));
if (!set_isempty(link->network->ndisc_allow_listed_prefix))
log_link_debug(link, "Prefix '%s' is not in allow list, ignoring", strna(b));
else
log_link_debug(link, "Prefix '%s' is in deny list, ignoring", strna(b));
}
break;
}
@ -1377,7 +1393,7 @@ DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(
ipv6_token_compare_func,
free);
int config_parse_ndisc_deny_listed_prefix(
int config_parse_ndisc_address_filter(
const char *unit,
const char *filename,
unsigned line,
@ -1390,7 +1406,6 @@ int config_parse_ndisc_deny_listed_prefix(
void *userdata) {
Set **list = data;
bool is_route;
int r;
assert(filename);
@ -1403,8 +1418,6 @@ int config_parse_ndisc_deny_listed_prefix(
return 0;
}
is_route = streq_ptr(lvalue, "RouteDenyList");
for (const char *p = rvalue;;) {
_cleanup_free_ char *n = NULL;
_cleanup_free_ struct in6_addr *a = NULL;
@ -1415,8 +1428,8 @@ int config_parse_ndisc_deny_listed_prefix(
return log_oom();
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse NDisc deny-listed %sprefix, ignoring assignment: %s",
is_route ? "route " : "", rvalue);
"Failed to parse NDisc %s=, ignoring assignment: %s",
lvalue, rvalue);
return 0;
}
if (r == 0)
@ -1425,8 +1438,8 @@ int config_parse_ndisc_deny_listed_prefix(
r = in_addr_from_string(AF_INET6, n, &ip);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"NDisc deny-listed %sprefix is invalid, ignoring assignment: %s",
is_route ? "route " : "", n);
"NDisc %s= entry is invalid, ignoring assignment: %s",
lvalue, n);
continue;
}
@ -1439,8 +1452,8 @@ int config_parse_ndisc_deny_listed_prefix(
return log_oom();
if (r == 0)
log_syntax(unit, LOG_WARNING, filename, line, 0,
"NDisc deny-listed %sprefix entry %s is duplicated, ignoring assignment.",
is_route ? "route " : "", n);
"NDisc %s= entry is duplicated, ignoring assignment: %s",
lvalue, n);
}
}

2
src/network/networkd-ndisc.h
View File

@ -77,7 +77,7 @@ int ndisc_configure(Link *link);
void ndisc_vacuum(Link *link);
void ndisc_flush(Link *link);
CONFIG_PARSER_PROTOTYPE(config_parse_ndisc_deny_listed_prefix);
CONFIG_PARSER_PROTOTYPE(config_parse_ndisc_address_filter);
CONFIG_PARSER_PROTOTYPE(config_parse_address_generation_type);
CONFIG_PARSER_PROTOTYPE(config_parse_ipv6_accept_ra_start_dhcp6_client);

10
src/network/networkd-network-gperf.gperf
View File

@ -237,8 +237,10 @@ IPv6AcceptRA.UseDNS, config_parse_bool,
IPv6AcceptRA.UseDomains, config_parse_dhcp_use_domains, 0, offsetof(Network, ipv6_accept_ra_use_domains)
IPv6AcceptRA.DHCPv6Client, config_parse_ipv6_accept_ra_start_dhcp6_client, 0, offsetof(Network, ipv6_accept_ra_start_dhcp6_client)
IPv6AcceptRA.RouteTable, config_parse_section_route_table, 0, 0
IPv6AcceptRA.PrefixDenyList, config_parse_ndisc_deny_listed_prefix, 0, offsetof(Network, ndisc_deny_listed_prefix)
IPv6AcceptRA.RouteDenyList, config_parse_ndisc_deny_listed_prefix, 0, offsetof(Network, ndisc_deny_listed_route_prefix)
IPv6AcceptRA.PrefixAllowList, config_parse_ndisc_address_filter, 0, offsetof(Network, ndisc_allow_listed_prefix)
IPv6AcceptRA.PrefixDenyList, config_parse_ndisc_address_filter, 0, offsetof(Network, ndisc_deny_listed_prefix)
IPv6AcceptRA.RouteAllowList, config_parse_ndisc_address_filter, 0, offsetof(Network, ndisc_allow_listed_route_prefix)
IPv6AcceptRA.RouteDenyList, config_parse_ndisc_address_filter, 0, offsetof(Network, ndisc_deny_listed_route_prefix)
DHCPServer.MaxLeaseTimeSec, config_parse_sec, 0, offsetof(Network, dhcp_server_max_lease_time_usec)
DHCPServer.DefaultLeaseTimeSec, config_parse_sec, 0, offsetof(Network, dhcp_server_default_lease_time_usec)
DHCPServer.EmitDNS, config_parse_bool, 0, offsetof(Network, dhcp_server_emit[SD_DHCP_LEASE_DNS].emit)
@ -470,8 +472,8 @@ DHCP.RapidCommit, config_parse_bool,
DHCP.ForceDHCPv6PDOtherInformation, config_parse_bool, 0, offsetof(Network, dhcp6_force_pd_other_information)
DHCPv4.UseDomainName, config_parse_dhcp_use_domains, 0, offsetof(Network, dhcp_use_domains)
DHCPv4.CriticalConnection, config_parse_tristate, 0, offsetof(Network, dhcp_critical)
IPv6AcceptRA.DenyList, config_parse_ndisc_deny_listed_prefix, 0, offsetof(Network, ndisc_deny_listed_prefix)
IPv6AcceptRA.BlackList, config_parse_ndisc_deny_listed_prefix, 0, offsetof(Network, ndisc_deny_listed_prefix)
IPv6AcceptRA.DenyList, config_parse_ndisc_address_filter, 0, offsetof(Network, ndisc_deny_listed_prefix)
IPv6AcceptRA.BlackList, config_parse_ndisc_address_filter, 0, offsetof(Network, ndisc_deny_listed_prefix)
TrafficControlQueueingDiscipline.Parent, config_parse_qdisc_parent, _QDISC_KIND_INVALID, 0
TrafficControlQueueingDiscipline.NetworkEmulatorDelaySec, config_parse_network_emulator_delay, 0, 0
TrafficControlQueueingDiscipline.NetworkEmulatorDelayJitterSec, config_parse_network_emulator_delay, 0, 0

2
src/network/networkd-network.c
View File

@ -607,7 +607,9 @@ static Network *network_free(Network *network) {
ordered_set_free(network->router_search_domains);
free(network->router_dns);
set_free_free(network->ndisc_deny_listed_prefix);
set_free_free(network->ndisc_allow_listed_prefix);
set_free_free(network->ndisc_deny_listed_route_prefix);
set_free_free(network->ndisc_allow_listed_route_prefix);
free(network->bridge_name);
free(network->bond_name);

2
src/network/networkd-network.h
View File

@ -257,7 +257,9 @@ struct Network {
IPv6AcceptRAStartDHCP6Client ipv6_accept_ra_start_dhcp6_client;
uint32_t ipv6_accept_ra_route_table;
Set *ndisc_deny_listed_prefix;
Set *ndisc_allow_listed_prefix;
Set *ndisc_deny_listed_route_prefix;
Set *ndisc_allow_listed_route_prefix;
OrderedSet *ipv6_tokens;
/* LLDP support */

2
test/fuzz/fuzz-network-parser/directives.network
View File

@ -310,7 +310,9 @@ UseDNS=
DHCPv6Client=
UseAutonomousPrefix=
UseOnLinkPrefix=
PrefixAllowList=
PrefixDenyList=
RouteAllowList=
RouteDenyList=
DenyList=
BlackList=