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common.ts
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common.ts
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import { FlowFilter, EventTypeFilter } from '~backend/proto/flow/flow_pb';
import * as helpers from '~/domain/helpers';
import { CiliumEventTypes } from '~/domain/cilium';
import { ReservedLabel, SpecialLabel } from '~/domain/labels';
import { Filters, FilterEntry, FilterKind } from '~/domain/filtering';
export type FlowFilters = [FlowFilter[], FlowFilter[]];
export const baseWhitelistFilter = (filters?: Filters): FlowFilter => {
const wlFilter = new FlowFilter();
const eventTypes: CiliumEventTypes[] = [];
if (filters?.httpStatus) {
// Filter by http status code allows only l7 event type
eventTypes.push(CiliumEventTypes.L7);
wlFilter.addHttpStatusCode(filters.httpStatus);
} else {
eventTypes.push(
CiliumEventTypes.Drop,
CiliumEventTypes.Trace,
CiliumEventTypes.L7,
);
}
eventTypes.forEach(eventTypeNumber => {
const eventTypeFilter = new EventTypeFilter();
eventTypeFilter.setType(eventTypeNumber);
wlFilter.addEventType(eventTypeFilter);
});
if (filters?.verdict) {
wlFilter.addVerdict(helpers.verdict.verdictToPb(filters.verdict));
}
// TODO: code for handling tcp flags should be here
// NOTE: 1.9.1 gets rid of that field, wait for the next release
wlFilter.addReply(false);
return wlFilter;
};
export const buildBlacklistFlowFilters = (filters?: Filters): FlowFilter[] => {
const blFilters: FlowFilter[] = [];
const blSrcLabelsFilter = new FlowFilter();
const blDstLabelsFilter = new FlowFilter();
blFilters.push(blSrcLabelsFilter, blDstLabelsFilter);
blSrcLabelsFilter.addSourceLabel(ReservedLabel.Unknown);
blDstLabelsFilter.addDestinationLabel(ReservedLabel.Unknown);
if (filters?.skipHost) {
blSrcLabelsFilter.addSourceLabel(ReservedLabel.Host);
blDstLabelsFilter.addDestinationLabel(ReservedLabel.Host);
}
if (filters?.skipKubeDns) {
blSrcLabelsFilter.addSourceLabel(SpecialLabel.KubeDNS);
const blDstKubeDns = new FlowFilter();
// TODO: consider this line to remove, as if service is Unmanaged, flows to
// TOOD: 53 port will be allowed; don't forget to fix `filter-flow.ts` too
blDstKubeDns.addDestinationLabel(SpecialLabel.KubeDNS);
blDstKubeDns.addDestinationPort('53');
blFilters.push(blDstKubeDns);
}
if (filters?.skipRemoteNode) {
blSrcLabelsFilter.addSourceLabel(ReservedLabel.RemoteNode);
blDstLabelsFilter.addDestinationLabel(ReservedLabel.RemoteNode);
}
if (filters?.skipPrometheusApp) {
blSrcLabelsFilter.addSourceLabel(SpecialLabel.PrometheusApp);
blDstLabelsFilter.addDestinationLabel(SpecialLabel.PrometheusApp);
}
if (filters?.skipKubeApiServer) {
blSrcLabelsFilter.addSourceLabel(ReservedLabel.KubeApiServer);
blDstLabelsFilter.addDestinationLabel(ReservedLabel.KubeApiServer);
}
// filter out intermediate dns requests
const blSrcLocalDnsFilter = new FlowFilter();
const blDstLocalDnsFilter = new FlowFilter();
blSrcLocalDnsFilter.addSourceFqdn('*.cluster.local*');
blDstLocalDnsFilter.addDestinationFqdn('*.cluster.local*');
blFilters.push(blSrcLocalDnsFilter, blDstLocalDnsFilter);
// filter out icmp flows
const blICMPv4Filter = new FlowFilter();
const blICMPv6Filter = new FlowFilter();
blICMPv4Filter.addProtocol('ICMPv4');
blICMPv6Filter.addProtocol('ICMPv6');
blFilters.push(blICMPv4Filter, blICMPv6Filter);
return blFilters;
};
export const filterEntryWhitelistFilters = (
filters: Filters,
filter: FilterEntry,
): FlowFilter[] => {
const { kind, query } = filter;
const wlFilters: FlowFilter[] = [];
const podsInNamespace = filters.namespace ? `${filters.namespace}/` : null;
const pod = filter.podNamespace
? `${filter.podNamespace}/${filter.query}`
: filters.namespace
? `${filters.namespace}/${filter.query}`
: null;
if (filter.fromRequired) {
// NOTE: this makes possible to catch flows [outside of ns] -> [ns]
// NOTE: but flows [ns] -> [outside of ns] are lost...
const toInside = baseWhitelistFilter(filters);
podsInNamespace && toInside.addDestinationPod(podsInNamespace);
// NOTE: ...this filter fixes this last case
const fromInside = baseWhitelistFilter(filters);
podsInNamespace && fromInside.addSourcePod(podsInNamespace);
switch (kind) {
case FilterKind.Label: {
toInside.addSourceLabel(query);
fromInside.addSourceLabel(query);
break;
}
case FilterKind.Ip: {
toInside.addSourceIp(query);
fromInside.addSourceIp(query);
break;
}
case FilterKind.Dns: {
toInside.addSourceFqdn(query);
fromInside.addSourceFqdn(query);
break;
}
case FilterKind.Identity: {
toInside.addSourceIdentity(+query);
fromInside.addSourceIdentity(+query);
break;
}
case FilterKind.Pod: {
pod && toInside.addSourcePod(pod);
fromInside.clearSourcePodList();
if (pod && podsInNamespace && !pod.startsWith(podsInNamespace)) {
fromInside.addDestinationPod(podsInNamespace);
}
pod && fromInside.addSourcePod(pod);
break;
}
}
wlFilters.push(toInside, fromInside);
}
if (filter.toRequired) {
// NOTE: this makes possible to catch flows [ns] -> [outside of ns]
// NOTE: but flows [outside of ns] -> [ns] are lost...
const fromInside = baseWhitelistFilter(filters);
podsInNamespace && fromInside.addSourcePod(podsInNamespace);
// NOTE: ...this filter fixes this last case
const toInside = baseWhitelistFilter(filters);
podsInNamespace && toInside.addDestinationPod(podsInNamespace);
switch (kind) {
case FilterKind.Label: {
fromInside.addDestinationLabel(query);
toInside.addDestinationLabel(query);
break;
}
case FilterKind.Ip: {
fromInside.addDestinationIp(query);
toInside.addDestinationIp(query);
break;
}
case FilterKind.Dns: {
fromInside.addDestinationFqdn(query);
toInside.addDestinationFqdn(query);
break;
}
case FilterKind.Identity: {
fromInside.addDestinationIdentity(+query);
toInside.addDestinationIdentity(+query);
break;
}
case FilterKind.Pod: {
pod && fromInside.addDestinationPod(pod);
toInside.clearDestinationPodList();
if (podsInNamespace && pod && !pod.startsWith(podsInNamespace)) {
toInside.addSourcePod(podsInNamespace);
}
pod && toInside.addDestinationPod(pod);
break;
}
}
wlFilters.push(fromInside, toInside);
}
return wlFilters;
};
// Taken from previous FlowStream class
export const buildFlowFilters = (filters: Filters): FlowFilters => {
const wlFilters: FlowFilter[] = [];
const blFilters = buildBlacklistFlowFilters(filters);
if (!filters.filters?.length) {
const namespace = filters?.namespace;
if (namespace) {
const wlSrcFilter = baseWhitelistFilter(filters);
const wlDstFilter = baseWhitelistFilter(filters);
wlSrcFilter.addSourcePod(`${namespace}/`);
wlDstFilter.addDestinationPod(`${namespace}/`);
wlFilters.push(wlSrcFilter, wlDstFilter);
} else {
wlFilters.push(baseWhitelistFilter(filters));
}
return [wlFilters, blFilters];
}
filters.filters.forEach(filter => {
wlFilters.push(...filterEntryWhitelistFilters(filters, filter));
});
return [wlFilters, blFilters];
};