connector/ldap: support the StartTLS flow for secure connections

When connecting to an LDAP server, there are three ways to connect:

1. Insecurely through port 389 (LDAP).
2. Securely through port 696 (LDAPS).
3. Insecurely through port 389 then negotiate TLS (StartTLS).

This PR adds support for the 3rd flow, letting dex connect to the
standard LDAP port then negotiating TLS through the LDAP protocol
itself.

See a writeup here:

http://www.openldap.org/faq/data/cache/185.html
This commit is contained in:
Eric Chiang 2017-04-12 14:13:34 -07:00
parent 9b0af83604
commit 74f5eaf47e
8 changed files with 334 additions and 27 deletions

View File

@ -30,20 +30,28 @@ connectors:
name: LDAP
config:
# Host and optional port of the LDAP server in the form "host:port".
# If the port is not supplied, it will be guessed based on "insecureNoSSL".
# 389 for insecure connections, 636 otherwise.
# If the port is not supplied, it will be guessed based on "insecureNoSSL",
# and "startTLS" flags. 389 for insecure or StartTLS connections, 636
# otherwise.
host: ldap.example.com:636
# Following field is required if the LDAP host is not using TLS (port 389).
# Because this option inherently leaks passwords to anyone on the same network
# as dex, THIS OPTION MAY BE REMOVED WITHOUT WARNING IN A FUTURE RELEASE.
#
# insecureNoSSL: true
# If a custom certificate isn't provide, this option can be used to turn on
# TLS certificate checks. As noted, it is insecure and shouldn't be used outside
# of explorative phases.
#
# insecureSkipVerify: true
# When connecting to the server, connect using the ldap:// protocol then issue
# a StartTLS command. If unspecified, connections will use the ldaps:// protocol
#
# startTLS: true
# Path to a trusted root certificate file. Default: use the host's root CA.
rootCA: /etc/dex/ldap.ca

49
connector/ldap/gen-certs.sh Executable file
View File

@ -0,0 +1,49 @@
#!/bin/bash -e
# Stolen from the coreos/matchbox repo.
echo "
[req]
req_extensions = v3_req
distinguished_name = req_distinguished_name
[req_distinguished_name]
[ v3_req ]
basicConstraints = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
subjectAltName = @alt_names
[alt_names]
DNS.101 = localhost
" > openssl.config
openssl genrsa -out testdata/ca.key 2048
openssl genrsa -out testdata/server.key 2048
openssl req \
-x509 -new -nodes \
-key testdata/ca.key \
-days 10000 -out testdata/ca.crt \
-subj "/CN=ldap-tests"
openssl req \
-new \
-key testdata/server.key \
-out testdata/server.csr \
-subj "/CN=localhost" \
-config openssl.config
openssl x509 -req \
-in testdata/server.csr \
-CA testdata/ca.crt \
-CAkey testdata/ca.key \
-CAcreateserial \
-out testdata/server.crt \
-days 10000 \
-extensions v3_req \
-extfile openssl.config
rm testdata/server.csr
rm testdata/ca.srl
rm openssl.config

View File

@ -61,6 +61,11 @@ type Config struct {
// Don't verify the CA.
InsecureSkipVerify bool `json:"insecureSkipVerify"`
// Connect to the insecure port then issue a StartTLS command to negotiate a
// secure connection. If unsupplied secure connections will use the LDAPS
// protocol.
StartTLS bool `json:"startTLS"`
// Path to a trusted root certificate file.
RootCA string `json:"rootCA"`
@ -238,9 +243,18 @@ func (c *ldapConnector) do(ctx context.Context, f func(c *ldap.Conn) error) erro
conn *ldap.Conn
err error
)
if c.InsecureNoSSL {
switch {
case c.InsecureNoSSL:
conn, err = ldap.Dial("tcp", c.Host)
} else {
case c.StartTLS:
conn, err = ldap.Dial("tcp", c.Host)
if err != nil {
return fmt.Errorf("failed to connect: %v", err)
}
if err := conn.StartTLS(c.tlsConfig); err != nil {
return fmt.Errorf("start TLS failed: %v", err)
}
default:
conn, err = ldap.DialTLS("tcp", c.Host, c.tlsConfig)
}
if err != nil {

View File

@ -21,6 +21,15 @@ import (
const envVar = "DEX_LDAP_TESTS"
// connectionMethod indicates how the test should connect to the LDAP server.
type connectionMethod int32
const (
connectStartTLS connectionMethod = iota
connectLDAPS
connectLDAP
)
// subtest is a login test against a given schema.
type subtest struct {
// Name of the sub-test.
@ -110,7 +119,7 @@ userpassword: bar
},
}
runTests(t, schema, c, tests)
runTests(t, schema, connectLDAP, c, tests)
}
func TestGroupQuery(t *testing.T) {
@ -198,7 +207,7 @@ member: cn=jane,ou=People,dc=example,dc=org
},
}
runTests(t, schema, c, tests)
runTests(t, schema, connectLDAP, c, tests)
}
func TestGroupsOnUserEntity(t *testing.T) {
@ -295,7 +304,93 @@ gidNumber: 1002
},
},
}
runTests(t, schema, c, tests)
runTests(t, schema, connectLDAP, c, tests)
}
func TestStartTLS(t *testing.T) {
schema := `
dn: dc=example,dc=org
objectClass: dcObject
objectClass: organization
o: Example Company
dc: example
dn: ou=People,dc=example,dc=org
objectClass: organizationalUnit
ou: People
dn: cn=jane,ou=People,dc=example,dc=org
objectClass: person
objectClass: inetOrgPerson
sn: doe
cn: jane
mail: janedoe@example.com
userpassword: foo
`
c := &Config{}
c.UserSearch.BaseDN = "ou=People,dc=example,dc=org"
c.UserSearch.NameAttr = "cn"
c.UserSearch.EmailAttr = "mail"
c.UserSearch.IDAttr = "DN"
c.UserSearch.Username = "cn"
tests := []subtest{
{
name: "validpassword",
username: "jane",
password: "foo",
want: connector.Identity{
UserID: "cn=jane,ou=People,dc=example,dc=org",
Username: "jane",
Email: "janedoe@example.com",
EmailVerified: true,
},
},
}
runTests(t, schema, connectStartTLS, c, tests)
}
func TestLDAPS(t *testing.T) {
schema := `
dn: dc=example,dc=org
objectClass: dcObject
objectClass: organization
o: Example Company
dc: example
dn: ou=People,dc=example,dc=org
objectClass: organizationalUnit
ou: People
dn: cn=jane,ou=People,dc=example,dc=org
objectClass: person
objectClass: inetOrgPerson
sn: doe
cn: jane
mail: janedoe@example.com
userpassword: foo
`
c := &Config{}
c.UserSearch.BaseDN = "ou=People,dc=example,dc=org"
c.UserSearch.NameAttr = "cn"
c.UserSearch.EmailAttr = "mail"
c.UserSearch.IDAttr = "DN"
c.UserSearch.Username = "cn"
tests := []subtest{
{
name: "validpassword",
username: "jane",
password: "foo",
want: connector.Identity{
UserID: "cn=jane,ou=People,dc=example,dc=org",
Username: "jane",
Email: "janedoe@example.com",
EmailVerified: true,
},
},
}
runTests(t, schema, connectLDAPS, c, tests)
}
// runTests runs a set of tests against an LDAP schema. It does this by
@ -305,7 +400,7 @@ gidNumber: 1002
// machine's PATH.
//
// The DEX_LDAP_TESTS must be set to "1"
func runTests(t *testing.T, schema string, config *Config, tests []subtest) {
func runTests(t *testing.T, schema string, connMethod connectionMethod, config *Config, tests []subtest) {
if os.Getenv(envVar) != "1" {
t.Skipf("%s not set. Skipping test (run 'export %s=1' to run tests)", envVar, envVar)
}
@ -316,6 +411,11 @@ func runTests(t *testing.T, schema string, config *Config, tests []subtest) {
}
}
wd, err := os.Getwd()
if err != nil {
t.Fatal(err)
}
tempDir, err := ioutil.TempDir("", "")
if err != nil {
t.Fatal(err)
@ -324,7 +424,13 @@ func runTests(t *testing.T, schema string, config *Config, tests []subtest) {
configBytes := new(bytes.Buffer)
if err := slapdConfigTmpl.Execute(configBytes, tmplData{tempDir, includes(t)}); err != nil {
data := tmplData{
TempDir: tempDir,
Includes: includes(t, wd),
}
data.TLSCertPath, data.TLSKeyPath = tlsAssets(t, wd)
if err := slapdConfigTmpl.Execute(configBytes, data); err != nil {
t.Fatal(err)
}
@ -344,7 +450,7 @@ func runTests(t *testing.T, schema string, config *Config, tests []subtest) {
cmd := exec.Command(
"slapd",
"-d", "any",
"-h", "ldap://localhost:10363/ ldaps://localhost:10636/ ldapi://"+socketPath,
"-h", "ldap://localhost:10389/ ldaps://localhost:10636/ ldapi://"+socketPath,
"-f", configPath,
)
cmd.Stdout = slapdOut
@ -385,18 +491,30 @@ func runTests(t *testing.T, schema string, config *Config, tests []subtest) {
wg.Wait()
}()
// Wait for slapd to come up.
time.Sleep(100 * time.Millisecond)
// Try a few times to connect to the LDAP server. On slower machines
// it can take a while for it to come up.
connected := false
wait := 100 * time.Millisecond
for i := 0; i < 5; i++ {
time.Sleep(wait)
ldapadd := exec.Command(
"ldapadd", "-x",
"-D", "cn=admin,dc=example,dc=org",
"-w", "admin",
"-f", schemaPath,
"-H", "ldap://localhost:10363/",
)
if out, err := ldapadd.CombinedOutput(); err != nil {
t.Errorf("ldapadd: %s", out)
ldapadd := exec.Command(
"ldapadd", "-x",
"-D", "cn=admin,dc=example,dc=org",
"-w", "admin",
"-f", schemaPath,
"-H", "ldap://localhost:10389/",
)
if out, err := ldapadd.CombinedOutput(); err != nil {
t.Logf("ldapadd: %s", out)
wait = wait * 2 // backoff
continue
}
connected = true
break
}
if !connected {
t.Errorf("ldapadd command failed")
return
}
@ -405,8 +523,19 @@ func runTests(t *testing.T, schema string, config *Config, tests []subtest) {
// We need to configure host parameters but don't want to overwrite user or
// group search configuration.
c.Host = "localhost:10363"
c.InsecureNoSSL = true
switch connMethod {
case connectStartTLS:
c.Host = "localhost:10389"
c.RootCA = "testdata/ca.crt"
c.StartTLS = true
case connectLDAPS:
c.Host = "localhost:10636"
c.RootCA = "testdata/ca.crt"
case connectLDAP:
c.Host = "localhost:10389"
c.InsecureNoSSL = true
}
c.BindDN = "cn=admin,dc=example,dc=org"
c.BindPW = "admin"
@ -488,10 +617,16 @@ type tmplData struct {
TempDir string
// List of schema files to include.
Includes []string
// TLS assets for LDAPS.
TLSKeyPath string
TLSCertPath string
}
// Config template copied from:
// http://www.zytrax.com/books/ldap/ch5/index.html#step1-slapd
//
// TLS instructions found here:
// http://www.openldap.org/doc/admin24/tls.html
var slapdConfigTmpl = template.Must(template.New("").Parse(`
{{ range $i, $include := .Includes }}
include {{ $include }}
@ -511,6 +646,9 @@ rootpw admin
# change path as necessary
directory {{ .TempDir }}
TLSCertificateFile {{ .TLSCertPath }}
TLSCertificateKeyFile {{ .TLSKeyPath }}
# Indices to maintain for this directory
# unique id so equality match only
index uid eq
@ -534,11 +672,18 @@ cachesize 10000
checkpoint 128 15
`))
func includes(t *testing.T) (paths []string) {
wd, err := os.Getwd()
if err != nil {
t.Fatalf("getting working directory: %v", err)
func tlsAssets(t *testing.T, wd string) (certPath, keyPath string) {
certPath = filepath.Join(wd, "testdata", "server.crt")
keyPath = filepath.Join(wd, "testdata", "server.key")
for _, p := range []string{certPath, keyPath} {
if _, err := os.Stat(p); err != nil {
t.Fatalf("failed to find TLS asset file: %s %v", p, err)
}
}
return
}
func includes(t *testing.T, wd string) (paths []string) {
for _, f := range includeFiles {
p := filepath.Join(wd, "testdata", f)
if _, err := os.Stat(p); err != nil {

19
connector/ldap/testdata/ca.crt vendored Normal file
View File

@ -0,0 +1,19 @@
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

27
connector/ldap/testdata/ca.key vendored Normal file
View File

@ -0,0 +1,27 @@
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----

18
connector/ldap/testdata/server.crt vendored Normal file
View File

@ -0,0 +1,18 @@
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

27
connector/ldap/testdata/server.key vendored Normal file
View File

@ -0,0 +1,27 @@
-----BEGIN RSA PRIVATE KEY-----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eVt4j23VdaJ9inzoKhZTJcqTAoGAH9znJZsGo16lt/1ReWqgF1Ptt+bCYY6drnsM
ylnODD4m74LLXFx0jOKLH4PUMeWJLBUXWBnIZ9pfid7kb7YOL3p1aJnwVWhtiDhT
qhxfLbZznOfmFT5xwMJtm2Tk7NBueSYXuBExs7jbZX8AUJau7/NBmPlGkTxBxGzg
z0XQa4kCgYBxYBXwFpLLjBO+bMMkoVOlMDj7feCOWP9CsnKQSHYqPbmmb+8mA7pN
mIWfjSVynVe+Ncn0I5Uijbs9QDYqcfApJQ+iXeb+VGrg4QkLHHGd/5kIY28Evc6A
KVyRIuiYNmgOXGpaFpMXSw718N4U7jWW7lqUxK2rvEupFhaL52oJFQ==
-----END RSA PRIVATE KEY-----