/
mtls.go
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/
mtls.go
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package envoy
import (
"fmt"
"strconv"
"strings"
core "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
api "github.com/envoyproxy/go-control-plane/envoy/config/listener/v3"
rbacConfig "github.com/envoyproxy/go-control-plane/envoy/config/rbac/v3"
proxyProtocol "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/listener/proxy_protocol/v3"
rbac "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/network/rbac/v3"
tls "github.com/envoyproxy/go-control-plane/envoy/extensions/transport_sockets/tls/v3"
matcher "github.com/envoyproxy/go-control-plane/envoy/type/matcher/v3"
"google.golang.org/protobuf/types/known/anypb"
"google.golang.org/protobuf/types/known/wrapperspb"
wrappers "google.golang.org/protobuf/types/known/wrapperspb"
)
type MTLS struct {
enabled bool
}
func newMTLS() *MTLS {
return &MTLS{}
}
func (l *MTLS) updateMTLSListener(cache *WorkQueueCache, params ListenerParams, paramsTLS TLSParams, mTLSParams MTLSParams) error {
_, _, _, listenerName, _, _ := getListenerAttributes(params, paramsTLS)
// validation
if mTLSParams.CACertificate == "" {
return fmt.Errorf("Cannot create/update mTLS listener: CA Certificate is empty")
}
if mTLSParams.Certificate == "" {
return fmt.Errorf("Cannot create/update mTLS listener: Server Certificate is empty")
}
if mTLSParams.PrivateKey == "" {
return fmt.Errorf("Cannot create/update mTLS listener: Private Key is empty")
}
if mTLSParams.Name == "" {
return fmt.Errorf("Cannot create/update mTLS listener: mTLS name is empty")
}
listenerIndex := getListenerIndex(cache.listeners, listenerName)
if listenerIndex == -1 {
return fmt.Errorf("Listener not found: %s", listenerName)
}
ll := cache.listeners[listenerIndex].(*api.Listener)
// set proxy protocol filter
ll.ListenerFilters = []*api.ListenerFilter{}
if mTLSParams.EnableProxyProtocol {
proxyProtocol := &proxyProtocol.ProxyProtocol{}
proxyProtocolPbst, err := anypb.New(proxyProtocol)
if err != nil {
return fmt.Errorf("anypb.New error: %s", err)
}
ll.ListenerFilters = append(ll.ListenerFilters, &api.ListenerFilter{
Name: "envoy.filters.listener.proxy_protocol",
ConfigType: &api.ListenerFilter_TypedConfig{
TypedConfig: proxyProtocolPbst,
},
})
}
// set AllowedIPRanges
if len(mTLSParams.AllowedIPRanges) > 0 {
rbacFilter := []*api.Filter{
{
Name: "envoy.filters.network.rbac",
ConfigType: &api.Filter_TypedConfig{
TypedConfig: getRBACConfig(mTLSParams),
},
},
}
ll.FilterChains[0].Filters = append(rbacFilter, ll.FilterChains[0].Filters...)
}
matchSubjectAltNames := make([]*tls.SubjectAltNameMatcher, len(mTLSParams.AllowedSubjectAltNames))
for k, name := range mTLSParams.AllowedSubjectAltNames {
matchSubjectAltNames[k] = &tls.SubjectAltNameMatcher{
SanType: tls.SubjectAltNameMatcher_DNS,
Matcher: &matcher.StringMatcher{
MatchPattern: &matcher.StringMatcher_Exact{
Exact: name,
},
},
}
}
if len(mTLSParams.AllowedSubjectAltNames) == 0 {
matchSubjectAltNames = nil
}
// add cert and key to tls listener
tlsContext, err := anypb.New(&tls.DownstreamTlsContext{
RequireClientCertificate: &wrapperspb.BoolValue{
Value: true,
},
CommonTlsContext: &tls.CommonTlsContext{
TlsParams: &tls.TlsParameters{
TlsMinimumProtocolVersion: tls.TlsParameters_TLSv1_2,
},
TlsCertificates: []*tls.TlsCertificate{
{
CertificateChain: &core.DataSource{
Specifier: &core.DataSource_InlineString{
InlineString: mTLSParams.Certificate,
},
},
PrivateKey: &core.DataSource{
Specifier: &core.DataSource_InlineString{
InlineString: mTLSParams.PrivateKey,
},
},
},
},
ValidationContextType: &tls.CommonTlsContext_ValidationContext{
ValidationContext: &tls.CertificateValidationContext{
MatchTypedSubjectAltNames: matchSubjectAltNames,
TrustedCa: &core.DataSource{
Specifier: &core.DataSource_InlineString{
InlineString: mTLSParams.CACertificate,
},
},
},
},
},
})
if err != nil {
panic(err)
}
ll.FilterChains[0].TransportSocket = &core.TransportSocket{
Name: "envoy.transport_sockets.tls",
ConfigType: &core.TransportSocket_TypedConfig{
TypedConfig: tlsContext,
},
}
return nil
}
func getRBACConfig(mTLSParams MTLSParams) *anypb.Any {
principals := []*rbacConfig.Principal{}
for _, ipRange := range mTLSParams.AllowedIPRanges {
ipRangeSplit := strings.Split(ipRange, "/")
prefixLen, err := strconv.ParseUint(ipRangeSplit[1], 10, 32)
if len(ipRangeSplit) != 2 || err != nil {
logger.Warningf("Invalid IP address range: %s in listener: l_mtls_%s", ipRange, mTLSParams.Name)
} else {
principals = append(principals, &rbacConfig.Principal{
Identifier: &rbacConfig.Principal_DirectRemoteIp{
DirectRemoteIp: &core.CidrRange{
AddressPrefix: ipRangeSplit[0],
PrefixLen: &wrappers.UInt32Value{
Value: uint32(prefixLen),
},
},
},
})
}
}
r := &rbac.RBAC{
StatPrefix: "rbac_" + mTLSParams.Name,
Rules: &rbacConfig.RBAC{
Action: rbacConfig.RBAC_ALLOW,
Policies: map[string]*rbacConfig.Policy{
"ip_filter": {
Principals: principals,
Permissions: []*rbacConfig.Permission{
{
Rule: &rbacConfig.Permission_Any{
Any: true,
},
},
},
},
},
},
}
pbst, err := anypb.New(r)
if err != nil {
panic(err)
}
return pbst
}