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[caclmgrd] Add support for multi-ASIC platforms #5022

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merged 16 commits into from
Aug 20, 2020
Merged

[caclmgrd] Add support for multi-ASIC platforms #5022

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1094086
Support for Control Plane ACL's for Multi-asic Platforms.
abdosi Jul 22, 2020
a1ac653
Address Review Comments
abdosi Jul 23, 2020
2137fc0
Fix Review Comments
abdosi Jul 23, 2020
5f16389
Merge remote-tracking branch 'upstream/master' into multi-asic-cacl
abdosi Jul 23, 2020
9a45fb5
Fix Comments
abdosi Jul 23, 2020
47a0699
Added Change for Multi-asic to have iptables
abdosi Jul 24, 2020
32de19d
Fix Review Comments
abdosi Jul 24, 2020
fbfc4a7
Merge remote-tracking branch 'upstream/master' into multi-asic-cacl
abdosi Jul 24, 2020
9410398
Added more comments on logic.
abdosi Jul 25, 2020
083bac4
Fixed all warning/errors reported by http://pep8online.com/
abdosi Jul 25, 2020
ecfe339
Fix Comment
abdosi Jul 26, 2020
3f3283b
Merge remote-tracking branch 'upstream/master' into multi-asic-cacl
abdosi Jul 26, 2020
590fe91
Verified with swsscommon package. Fix issue for single asic platforms.
abdosi Jul 27, 2020
d2f8b6f
Moved to new python package
abdosi Jul 27, 2020
1e8cdc4
Address Review Comments.
abdosi Aug 19, 2020
087163c
Address Review Comments.
abdosi Aug 19, 2020
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6 changes: 6 additions & 0 deletions files/build_templates/sonic_debian_extension.j2
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Expand Up @@ -214,6 +214,12 @@ if [[ $CONFIGURED_ARCH == amd64 ]]; then
sudo DEBIAN_FRONTEND=noninteractive dpkg --root=$FILESYSTEM_ROOT -i $debs_path/kdump-tools_*.deb || \
sudo LANG=C DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true chroot $FILESYSTEM_ROOT apt-get -q --no-install-suggests --no-install-recommends --force-no install
fi
# Install python-swss-common package and all its dependent packages
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{% if python_swss_debs.strip() -%}
{% for deb in python_swss_debs.strip().split(' ') -%}
sudo dpkg --root=$FILESYSTEM_ROOT -i {{deb}} || sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y install -f
{% endfor %}
{% endif %}

# Install custom-built monit package and SONiC configuration files
sudo dpkg --root=$FILESYSTEM_ROOT -i $debs_path/monit_*.deb || \
Expand Down
162 changes: 90 additions & 72 deletions files/image_config/caclmgrd/caclmgrd
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Expand Up @@ -16,7 +16,9 @@ try:
import subprocess
import sys
import syslog
from swsssdk import ConfigDBConnector
import sonic_device_util
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from swsscommon import swsscommon
from swsssdk import SonicDBConfig, ConfigDBConnector
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except ImportError as err:
raise ImportError("%s - required module not found" % str(err))

Expand Down Expand Up @@ -88,9 +90,17 @@ class ControlPlaneAclManager(object):
}

def __init__(self):
# Open a handle to the Config database
self.config_db = ConfigDBConnector()
self.config_db.connect()
SonicDBConfig.load_sonic_global_db_config()
self.config_db_map = {}
self.iptables_cmd_ns_prefix = {}
self.config_db_map[''] = ConfigDBConnector(use_unix_socket_path=True, namespace='')
self.config_db_map[''].connect()
self.iptables_cmd_ns_prefix[''] = ""
namespaces = sonic_device_util.get_all_namespaces()
for front_asic_namespaces in namespaces['front_ns']:
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self.config_db_map[front_asic_namespaces] = ConfigDBConnector(use_unix_socket_path=True, namespace=front_asic_namespaces)
self.config_db_map[front_asic_namespaces].connect()
self.iptables_cmd_ns_prefix[front_asic_namespaces] = "ip netns exec " + front_asic_namespaces + " "

def run_commands(self, commands):
"""
Expand Down Expand Up @@ -133,7 +143,7 @@ class ControlPlaneAclManager(object):
tcp_flags_str = tcp_flags_str[:-1]
return tcp_flags_str

def generate_block_ip2me_traffic_iptables_commands(self):
def generate_block_ip2me_traffic_iptables_commands(self, namespace):
INTERFACE_TABLE_NAME_LIST = [
"LOOPBACK_INTERFACE",
"MGMT_INTERFACE",
Expand All @@ -146,7 +156,7 @@ class ControlPlaneAclManager(object):

# Add iptables rules to drop all packets destined for peer-to-peer interface IP addresses
for iface_table_name in INTERFACE_TABLE_NAME_LIST:
iface_table = self.config_db.get_table(iface_table_name)
iface_table = self.config_db_map[namespace].get_table(iface_table_name)
if iface_table:
for key, _ in iface_table.iteritems():
if not _ip_prefix_in_key(key):
Expand All @@ -160,9 +170,9 @@ class ControlPlaneAclManager(object):
ip_addr = next(ip_ntwrk.hosts()) if iface_table_name == "VLAN_INTERFACE" else ip_ntwrk.network_address

if isinstance(ip_ntwrk, ipaddress.IPv4Network):
block_ip2me_cmds.append("iptables -A INPUT -d {}/{} -j DROP".format(ip_addr, ip_ntwrk.max_prefixlen))
block_ip2me_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -d {}/{} -j DROP".format(ip_addr, ip_ntwrk.max_prefixlen)))
elif isinstance(ip_ntwrk, ipaddress.IPv6Network):
block_ip2me_cmds.append("ip6tables -A INPUT -d {}/{} -j DROP".format(ip_addr, ip_ntwrk.max_prefixlen))
block_ip2me_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -d {}/{} -j DROP".format(ip_addr, ip_ntwrk.max_prefixlen)))
else:
log_warning("Unrecognized IP address type on interface '{}': {}".format(iface_name, ip_ntwrk))

Expand All @@ -182,7 +192,7 @@ class ControlPlaneAclManager(object):
else:
return False

def get_acl_rules_and_translate_to_iptables_commands(self):
def get_acl_rules_and_translate_to_iptables_commands(self, namespace):
"""
Retrieves current ACL tables and rules from Config DB, translates
control plane ACLs into a list of iptables commands that can be run
Expand All @@ -197,72 +207,72 @@ class ControlPlaneAclManager(object):
# First, add iptables commands to set default policies to accept all
# traffic. In case we are connected remotely, the connection will not
# drop when we flush the current rules
iptables_cmds.append("iptables -P INPUT ACCEPT")
iptables_cmds.append("iptables -P FORWARD ACCEPT")
iptables_cmds.append("iptables -P OUTPUT ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -P INPUT ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -P FORWARD ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -P OUTPUT ACCEPT")

# Add iptables command to flush the current rules
iptables_cmds.append("iptables -F")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -F")

# Add iptables command to delete all non-default chains
iptables_cmds.append("iptables -X")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -X")

# Add same set of commands for ip6tables
iptables_cmds.append("ip6tables -P INPUT ACCEPT")
iptables_cmds.append("ip6tables -P FORWARD ACCEPT")
iptables_cmds.append("ip6tables -P OUTPUT ACCEPT")
iptables_cmds.append("ip6tables -F")
iptables_cmds.append("ip6tables -X")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -P INPUT ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -P FORWARD ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -P OUTPUT ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -F")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -X")

# Add iptables/ip6tables commands to allow all traffic from localhost
iptables_cmds.append("iptables -A INPUT -s 127.0.0.1 -i lo -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -s ::1 -i lo -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -s 127.0.0.1 -i lo -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -s ::1 -i lo -j ACCEPT")

# Add iptables/ip6tables commands to allow all incoming packets from established
# connections or new connections which are related to established connections
iptables_cmds.append("iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT")

# Add iptables/ip6tables commands to allow bidirectional ICMPv4 ping and traceroute
# TODO: Support processing ICMPv4 service ACL rules, and remove this blanket acceptance
iptables_cmds.append("iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT")
iptables_cmds.append("iptables -A INPUT -p icmp --icmp-type echo-reply -j ACCEPT")
iptables_cmds.append("iptables -A INPUT -p icmp --icmp-type destination-unreachable -j ACCEPT")
iptables_cmds.append("iptables -A INPUT -p icmp --icmp-type time-exceeded -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -p icmp --icmp-type echo-reply -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -p icmp --icmp-type destination-unreachable -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -p icmp --icmp-type time-exceeded -j ACCEPT")

# Add iptables/ip6tables commands to allow bidirectional ICMPv6 ping and traceroute
# TODO: Support processing ICMPv6 service ACL rules, and remove this blanket acceptance
iptables_cmds.append("ip6tables -A INPUT -p icmpv6 --icmpv6-type echo-request -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -p icmpv6 --icmpv6-type echo-reply -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -p icmpv6 --icmpv6-type destination-unreachable -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -p icmpv6 --icmpv6-type time-exceeded -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p icmpv6 --icmpv6-type echo-request -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p icmpv6 --icmpv6-type echo-reply -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p icmpv6 --icmpv6-type destination-unreachable -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p icmpv6 --icmpv6-type time-exceeded -j ACCEPT")

# Add iptables/ip6tables commands to allow all incoming Neighbor Discovery Protocol (NDP) NS/NA/RS/RA messages
# TODO: Support processing NDP service ACL rules, and remove this blanket acceptance
iptables_cmds.append("ip6tables -A INPUT -p icmpv6 --icmpv6-type neighbor-solicitation -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -p icmpv6 --icmpv6-type neighbor-advertisement -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -p icmpv6 --icmpv6-type router-solicitation -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -p icmpv6 --icmpv6-type router-advertisement -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p icmpv6 --icmpv6-type neighbor-solicitation -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p icmpv6 --icmpv6-type neighbor-advertisement -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p icmpv6 --icmpv6-type router-solicitation -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p icmpv6 --icmpv6-type router-advertisement -j ACCEPT")

# Add iptables/ip6tables commands to allow all incoming IPv4 DHCP packets
iptables_cmds.append("iptables -A INPUT -p udp --dport 67:68 -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -p udp --dport 67:68 -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -p udp --dport 67:68 --sport 67:68 -j ACCEPT")
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iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p udp --dport 67:68 --sport 67:68 -j ACCEPT")

# Add iptables/ip6tables commands to allow all incoming IPv6 DHCP packets
iptables_cmds.append("iptables -A INPUT -p udp --dport 546:547 -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -p udp --dport 546:547 -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -p udp --dport 546:547 --sport 546:547 -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p udp --dport 546:547 --sport 546:547 -j ACCEPT")

# Add iptables/ip6tables commands to allow all incoming BGP traffic
# TODO: Determine BGP ACLs based on configured device sessions, and remove this blanket acceptance
iptables_cmds.append("iptables -A INPUT -p tcp --dport 179 -j ACCEPT")
iptables_cmds.append("iptables -A INPUT -p tcp --sport 179 -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -p tcp --dport 179 -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -p tcp --sport 179 -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -p tcp --dport 179 -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -p tcp --sport 179 -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p tcp --dport 179 -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p tcp --sport 179 -j ACCEPT")


# Get current ACL tables and rules from Config DB
self._tables_db_info = self.config_db.get_table(self.ACL_TABLE)
self._rules_db_info = self.config_db.get_table(self.ACL_RULE)
self._tables_db_info = self.config_db_map[namespace].get_table(self.ACL_TABLE)
self._rules_db_info = self.config_db_map[namespace].get_table(self.ACL_RULE)

num_ctrl_plane_acl_rules = 0

Expand Down Expand Up @@ -363,58 +373,66 @@ class ControlPlaneAclManager(object):
# Append the packet action as the jump target
rule_cmd += " -j {}".format(rule_props["PACKET_ACTION"])

iptables_cmds.append(rule_cmd)
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + rule_cmd)
num_ctrl_plane_acl_rules += 1

# Add iptables commands to block ip2me traffic
iptables_cmds += self.generate_block_ip2me_traffic_iptables_commands()
iptables_cmds += self.generate_block_ip2me_traffic_iptables_commands(namespace)

# Add iptables/ip6tables commands to allow all incoming packets with TTL of 0 or 1
# This allows the device to respond to tools like tcptraceroute
iptables_cmds.append("iptables -A INPUT -m ttl --ttl-lt 2 -j ACCEPT")
iptables_cmds.append("ip6tables -A INPUT -p tcp -m hl --hl-lt 2 -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -m ttl --ttl-lt 2 -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p tcp -m hl --hl-lt 2 -j ACCEPT")

# Finally, if the device has control plane ACLs configured,
# add iptables/ip6tables commands to drop all other incoming packets
if num_ctrl_plane_acl_rules > 0:
iptables_cmds.append("iptables -A INPUT -j DROP")
iptables_cmds.append("iptables -A FORWARD -j DROP")
iptables_cmds.append("ip6tables -A INPUT -j DROP")
iptables_cmds.append("ip6tables -A FORWARD -j DROP")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -j DROP")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A FORWARD -j DROP")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -j DROP")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A FORWARD -j DROP")

return iptables_cmds

def update_control_plane_acls(self):
def update_control_plane_acls(self, namespace):
"""
Convenience wrapper which retrieves current ACL tables and rules from
Config DB, translates control plane ACLs into a list of iptables
commands and runs them.
"""
iptables_cmds = self.get_acl_rules_and_translate_to_iptables_commands()

iptables_cmds = self.get_acl_rules_and_translate_to_iptables_commands(namespace)
log_info("Issuing the following iptables commands:")
for cmd in iptables_cmds:
log_info(" " + cmd)

self.run_commands(iptables_cmds)

def notification_handler(self, key, data):
log_info("ACL configuration changed. Updating iptables rules for control plane ACLs...")
self.update_control_plane_acls()

def run(self):
# Unconditionally update control plane ACLs once at start
self.update_control_plane_acls()

# Subscribe to notifications when ACL tables or rules change
self.config_db.subscribe(self.ACL_TABLE,
lambda table, key, data: self.notification_handler(key, data))
self.config_db.subscribe(self.ACL_RULE,
lambda table, key, data: self.notification_handler(key, data))

# Indefinitely listen for Config DB notifications
self.config_db.listen()

# Select Time-out for 10 Seconds
SELECT_TIMEOUT_MS = 1000 * 10
swsscommon.SonicDBConfig.initializeGlobalConfig()
sel = swsscommon.Select()
config_db_subscriber_table_map = {}
for namespace in self.config_db_map.keys():
# Unconditionally update control plane ACLs once at start
self.update_control_plane_acls(namespace)
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acl_db_connector = swsscommon.DBConnector("CONFIG_DB", 0, False, namespace)
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subscribe_acl_table = swsscommon.SubscriberStateTable(acl_db_connector, swsscommon.CFG_ACL_TABLE_TABLE_NAME)
subscribe_acl_rule_table = swsscommon.SubscriberStateTable(acl_db_connector, swsscommon.CFG_ACL_RULE_TABLE_NAME)
sel.addSelectable(subscribe_acl_table)
sel.addSelectable(subscribe_acl_rule_table)
config_db_subscriber_table_map[namespace] = []
config_db_subscriber_table_map[namespace].append(subscribe_acl_table)
config_db_subscriber_table_map[namespace].append(subscribe_acl_rule_table)
while True:
(state, c) = sel.select(SELECT_TIMEOUT_MS)
if state != swsscommon.Select.OBJECT:
continue
namespace = c.getDbNamespace()
for table in config_db_subscriber_table_map[namespace]:
table.pop()
self.update_control_plane_acls(namespace)

# ============================= Functions =============================

Expand Down
5 changes: 4 additions & 1 deletion slave.mk
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Expand Up @@ -800,7 +800,8 @@ $(addprefix $(TARGET_PATH)/, $(SONIC_INSTALLERS)) : $(TARGET_PATH)/% : \
$(KDUMP_TOOLS) \
$(LIBPAM_TACPLUS) \
$(LIBNSS_TACPLUS) \
$(MONIT)) \
$(MONIT) \
$(PYTHON_SWSSCOMMON)) \
$$(addprefix $(TARGET_PATH)/,$$($$*_DOCKERS)) \
$$(addprefix $(FILES_PATH)/,$$($$*_FILES)) \
$(if $(findstring y,$(ENABLE_ZTP)),$(addprefix $(IMAGE_DISTRO_DEBS_PATH)/,$(SONIC_ZTP))) \
Expand Down Expand Up @@ -845,6 +846,8 @@ $(addprefix $(TARGET_PATH)/, $(SONIC_INSTALLERS)) : $(TARGET_PATH)/% : \
export sonic_yang_models_py3_wheel_path="$(addprefix $(PYTHON_WHEELS_PATH)/,$(SONIC_YANG_MODELS_PY3))"
export sonic_yang_mgmt_py_wheel_path="$(addprefix $(PYTHON_WHEELS_PATH)/,$(SONIC_YANG_MGMT_PY))"
export multi_instance="false"
export python_swss_debs="$(addprefix $(IMAGE_DISTRO_DEBS_PATH)/,$($(LIBSWSSCOMMON)_RDEPENDS))"
export python_swss_debs+=" $(addprefix $(IMAGE_DISTRO_DEBS_PATH)/,$(LIBSWSSCOMMON)) $(addprefix $(IMAGE_DISTRO_DEBS_PATH)/,$(PYTHON_SWSSCOMMON))"

$(foreach docker, $($*_DOCKERS),\
export docker_image="$(docker)"
Expand Down