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Add awareness of server mode to TLS configurator 

Preivously the TLS configurator would default to presenting auto TLS
certificates as client certificates.

Server agents should not have this behavior and should instead present
the manually configured certs. The autoTLS certs for servers are
exclusively used for peering and should not be used as the default for
outbound communication.
This commit is contained in:
freddygv 2022-09-15 19:12:10 -06:00
parent f30bc96239
commit 5fbb26525b
6 changed files with 133 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
agent/config/builder.go
View File

@ -2596,6 +2596,7 @@ func (b *builder) buildTLSConfig(rt RuntimeConfig, t TLS) (tlsutil.Config, error
mapCommon("grpc", t.GRPC, &c.GRPC)
c.GRPC.UseAutoCert = boolValWithDefault(t.GRPC.UseAutoCert, false)
c.ServerMode = rt.ServerMode
c.ServerName = rt.ServerName
c.NodeName = rt.NodeName
c.Domain = rt.DNSDomain

1
agent/config/runtime_oss_test.go
View File

@ -66,6 +66,7 @@ func TestLoad_IntegrationWithFlags_OSS(t *testing.T) {
expected: func(rt *RuntimeConfig) {
rt.DataDir = dataDir
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.LeaveOnTerm = false
rt.SkipLeaveOnInt = true
rt.RPCConfig.EnableStreaming = true

19
agent/config/runtime_test.go
View File

@ -177,6 +177,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
expected: func(rt *RuntimeConfig) {
rt.Bootstrap = true
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.LeaveOnTerm = false
rt.SkipLeaveOnInt = true
rt.DataDir = dataDir
@ -194,6 +195,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
expected: func(rt *RuntimeConfig) {
rt.BootstrapExpect = 3
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.LeaveOnTerm = false
rt.SkipLeaveOnInt = true
rt.DataDir = dataDir
@ -208,6 +210,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
`-data-dir=` + dataDir,
},
expected: func(rt *RuntimeConfig) {
rt.TLS.ServerMode = false
rt.ClientAddrs = []*net.IPAddr{ipAddr("1.2.3.4")}
rt.DNSAddrs = []net.Addr{tcpAddr("1.2.3.4:8600"), udpAddr("1.2.3.4:8600")}
rt.HTTPAddrs = []net.Addr{tcpAddr("1.2.3.4:8500")}
@ -319,6 +322,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
rt.SerfBindAddrLAN = tcpAddr("127.0.0.1:8301")
rt.SerfBindAddrWAN = tcpAddr("127.0.0.1:8302")
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.SkipLeaveOnInt = true
rt.TaggedAddresses = map[string]string{
"lan": "127.0.0.1",
@ -659,6 +663,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
rt.DataDir = dataDir
// server things
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.LeaveOnTerm = false
rt.SkipLeaveOnInt = true
rt.RPCConfig.EnableStreaming = true
@ -841,6 +846,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
},
expected: func(rt *RuntimeConfig) {
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.LeaveOnTerm = false
rt.SkipLeaveOnInt = true
rt.DataDir = dataDir
@ -1881,6 +1887,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
rt.BootstrapExpect = 0
rt.LeaveOnTerm = false
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.SkipLeaveOnInt = true
rt.DataDir = dataDir
rt.RPCConfig.EnableStreaming = true
@ -1898,6 +1905,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
rt.BootstrapExpect = 2
rt.LeaveOnTerm = false
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.SkipLeaveOnInt = true
rt.DataDir = dataDir
rt.RPCConfig.EnableStreaming = true
@ -1918,6 +1926,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
rt.BootstrapExpect = 4
rt.LeaveOnTerm = false
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.SkipLeaveOnInt = true
rt.DataDir = dataDir
rt.RPCConfig.EnableStreaming = true
@ -1937,6 +1946,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
expected: func(rt *RuntimeConfig) {
rt.LeaveOnTerm = true
rt.ServerMode = false
rt.TLS.ServerMode = false
rt.SkipLeaveOnInt = false
rt.DataDir = dataDir
},
@ -3056,6 +3066,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
// server things
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.LeaveOnTerm = false
rt.SkipLeaveOnInt = true
rt.RPCConfig.EnableStreaming = true
@ -3087,6 +3098,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
// server things
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.LeaveOnTerm = false
rt.SkipLeaveOnInt = true
rt.RPCConfig.EnableStreaming = true
@ -3115,6 +3127,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
// server things
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.LeaveOnTerm = false
rt.SkipLeaveOnInt = true
rt.RPCConfig.EnableStreaming = true
@ -3140,6 +3153,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
rt.ConnectEnabled = true
// server things
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.LeaveOnTerm = false
rt.SkipLeaveOnInt = true
rt.RPCConfig.EnableStreaming = true
@ -3162,6 +3176,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
// rpc.enable_streaming make no sense in not-server mode
rt.RPCConfig.EnableStreaming = true
rt.ServerMode = false
rt.TLS.ServerMode = false
},
})
run(t, testCase{
@ -3185,6 +3200,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
rt.UseStreamingBackend = true
// server things
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.LeaveOnTerm = false
rt.SkipLeaveOnInt = true
},
@ -3602,6 +3618,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
rt.ConnectMeshGatewayWANFederationEnabled = true
// server things
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.LeaveOnTerm = false
rt.SkipLeaveOnInt = true
rt.RPCConfig.EnableStreaming = true
@ -5023,6 +5040,7 @@ func TestLoad_IntegrationWithFlags(t *testing.T) {
rt.DataDir = dataDir
rt.LeaveOnTerm = false
rt.ServerMode = true
rt.TLS.ServerMode = true
rt.SkipLeaveOnInt = true
rt.TLS.InternalRPC.CertFile = "foo"
rt.RPCConfig.EnableStreaming = true
@ -6441,6 +6459,7 @@ func TestLoad_FullConfig(t *testing.T) {
},
NodeName: "otlLxGaI",
ServerName: "Oerr9n1G",
ServerMode: true,
Domain: "7W1xXSqd",
EnableAgentTLSForChecks: true,
},

13
agent/config/testdata/TestRuntimeConfig_Sanitize.golden vendored
View File

@ -374,10 +374,10 @@
"CipherSuites": [],
"KeyFile": "hidden",
"TLSMinVersion": "",
"UseAutoCert": false,
"VerifyIncoming": false,
"VerifyOutgoing": false,
"VerifyServerHostname": false,
"UseAutoCert": false
"VerifyServerHostname": false
},
"HTTPS": {
"CAFile": "",
@ -386,10 +386,10 @@
"CipherSuites": [],
"KeyFile": "hidden",
"TLSMinVersion": "",
"UseAutoCert": false,
"VerifyIncoming": false,
"VerifyOutgoing": false,
"VerifyServerHostname": false,
"UseAutoCert": false
"VerifyServerHostname": false
},
"InternalRPC": {
"CAFile": "",
@ -398,12 +398,13 @@
"CipherSuites": [],
"KeyFile": "hidden",
"TLSMinVersion": "",
"UseAutoCert": false,
"VerifyIncoming": false,
"VerifyOutgoing": false,
"VerifyServerHostname": false,
"UseAutoCert": false
"VerifyServerHostname": false
},
"NodeName": "",
"ServerMode": false,
"ServerName": ""
},
"TaggedAddresses": {},

13
tlsutil/config.go
View File

@ -110,6 +110,10 @@ type ProtocolConfig struct {
// Config configures the Configurator.
type Config struct {
// ServerMode indicates whether the configurator is attached to a server
// or client agent.
ServerMode bool
// InternalRPC is used to configure the internal multiplexed RPC protocol.
InternalRPC ProtocolConfig
@ -597,9 +601,12 @@ func (c *Configurator) commonTLSConfig(state protocolConfig, cfg ProtocolConfig,
// to a server requesting a certificate. Return the autoEncrypt certificate
// if possible, otherwise default to the manually provisioned one.
tlsConfig.GetClientCertificate = func(*tls.CertificateRequestInfo) (*tls.Certificate, error) {
cert := c.autoTLS.cert
if cert == nil {
cert = state.cert
cert := state.cert
// In the general case we only prefer to dial out with the autoTLS cert if we are a client.
// The server's autoTLS cert is exclusively for peering control plane traffic.
if !c.base.ServerMode && c.autoTLS.cert != nil {
cert = c.autoTLS.cert
}
if cert == nil {

92
tlsutil/config_test.go
View File

@ -467,6 +467,98 @@ func TestConfigurator_ALPNRPCConfig(t *testing.T) {
})
}
func TestConfigurator_OutgoingRPC_ServerMode(t *testing.T) {
type testCase struct {
clientConfig Config
expectName string
}
run := func(t *testing.T, tc testCase) {
serverCfg := makeConfigurator(t, Config{
InternalRPC: ProtocolConfig{
CAFile: "../test/hostname/CertAuth.crt",
CertFile: "../test/hostname/Alice.crt",
KeyFile: "../test/hostname/Alice.key",
VerifyIncoming: true,
},
ServerMode: true,
})
serverConn, errc, certc := startTLSServer(serverCfg.IncomingRPCConfig())
if serverConn == nil {
t.Fatalf("startTLSServer err: %v", <-errc)
}
clientCfg := makeConfigurator(t, tc.clientConfig)
bettyCert := loadFile(t, "../test/hostname/Betty.crt")
bettyKey := loadFile(t, "../test/hostname/Betty.key")
require.NoError(t, clientCfg.UpdateAutoTLSCert(bettyCert, bettyKey))
wrap := clientCfg.OutgoingRPCWrapper()
require.NotNil(t, wrap)
tlsClient, err := wrap("dc1", serverConn)
require.NoError(t, err)
defer tlsClient.Close()
err = tlsClient.(*tls.Conn).Handshake()
require.NoError(t, err)
err = <-errc
require.NoError(t, err)
clientCerts := <-certc
require.NotEmpty(t, clientCerts)
require.Equal(t, tc.expectName, clientCerts[0].Subject.CommonName)
// Check the server side of the handshake succeeded.
require.NoError(t, <-errc)
}
tt := map[string]testCase{
"server with manual cert": {
clientConfig: Config{
InternalRPC: ProtocolConfig{
VerifyOutgoing: true,
CAFile: "../test/hostname/CertAuth.crt",
CertFile: "../test/hostname/Bob.crt",
KeyFile: "../test/hostname/Bob.key",
},
ServerMode: true,
},
// Even though an AutoTLS cert is configured, the server will prefer the manually configured cert.
expectName: "Bob",
},
"client with manual cert": {
clientConfig: Config{
InternalRPC: ProtocolConfig{
VerifyOutgoing: true,
CAFile: "../test/hostname/CertAuth.crt",
CertFile: "../test/hostname/Bob.crt",
KeyFile: "../test/hostname/Bob.key",
},
ServerMode: false,
},
expectName: "Betty",
},
"client with auto-TLS": {
clientConfig: Config{
ServerMode: false,
AutoTLS: true,
},
expectName: "Betty",
},
}
for name, tc := range tt {
t.Run(name, func(t *testing.T) {
run(t, tc)
})
}
}
func TestConfigurator_OutgoingInternalRPCWrapper(t *testing.T) {
// if this test is failing because of expired certificates
// use the procedure in test/CA-GENERATION.md