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Merge pull request #76920 from sempr/master

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MOD: support wildcard DNS for apiserver certSANs
This commit is contained in:
Kubernetes Prow Robot 2019-04-29 14:36:01 -07:00 committed by GitHub
commit 35b278447c
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4 changed files with 40 additions and 2 deletions
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6
cmd/kubeadm/app/apis/kubeadm/validation/validation.go
View File

@ -308,8 +308,10 @@ func ValidateCertSANs(altnames []string, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
for _, altname := range altnames {
if errs := validation.IsDNS1123Subdomain(altname); len(errs) != 0 {
if net.ParseIP(altname) == nil {
allErrs = append(allErrs, field.Invalid(fldPath, altname, fmt.Sprintf("altname is not a valid IP address or DNS label: %s", strings.Join(errs, "; "))))
if errs2 := validation.IsWildcardDNS1123Subdomain(altname); len(errs2) != 0 {
if net.ParseIP(altname) == nil {
allErrs = append(allErrs, field.Invalid(fldPath, altname, fmt.Sprintf("altname is not a valid IP address, DNS label or a DNS label with subdomain wildcards: %s; %s", strings.Join(errs, "; "), strings.Join(errs2, "; "))))
}
}
}
}

5
cmd/kubeadm/app/apis/kubeadm/validation/validation_test.go
View File

@ -144,6 +144,11 @@ func TestValidateCertSANs(t *testing.T) {
{[]string{"my-hostname2", "my.other.subdomain", "10.0.0.10"}, true}, // supported
{[]string{"my-hostname", "my.subdomain", "2001:db8::4"}, true}, // supported
{[]string{"my-hostname2", "my.other.subdomain", "2001:db8::10"}, true}, // supported
{[]string{"*.my-hostname2", "*.my.other.subdomain"}, true}, // supported Wildcard DNS label
{[]string{"**.my-hostname2", "my.other.subdomain"}, false}, // not a Wildcard DNS label
{[]string{"*.*.my-hostname2", "my.other.subdomain"}, false}, // not a Wildcard DNS label
{[]string{"a.*.my-hostname2", "my.other.subdomain"}, false}, // not a Wildcard DNS label
{[]string{"*", "my.other.subdomain", "2001:db8::10"}, false}, // not a Wildcard DNS label
}
for _, rt := range tests {
actual := ValidateCertSANs(rt.sans, nil)

3
cmd/kubeadm/app/util/pkiutil/pki_helpers.go
View File

@ -446,6 +446,7 @@ func getAltNames(cfg *kubeadmapi.InitConfiguration, certName string) (*certutil.
// altNames is passed in with a pointer, and the struct is modified
// valid IP address strings are parsed and added to altNames.IPs as net.IP's
// RFC-1123 compliant DNS strings are added to altNames.DNSNames as strings
// RFC-1123 compliant wildcard DNS strings are added to altNames.DNSNames as strings
// certNames is used to print user facing warnings and should be the name of the cert the altNames will be used for
func appendSANsToAltNames(altNames *certutil.AltNames, SANs []string, certName string) {
for _, altname := range SANs {
@ -453,6 +454,8 @@ func appendSANsToAltNames(altNames *certutil.AltNames, SANs []string, certName s
altNames.IPs = append(altNames.IPs, ip)
} else if len(validation.IsDNS1123Subdomain(altname)) == 0 {
altNames.DNSNames = append(altNames.DNSNames, altname)
} else if len(validation.IsWildcardDNS1123Subdomain(altname)) == 0 {
altNames.DNSNames = append(altNames.DNSNames, altname)
} else {
fmt.Printf(
"[certificates] WARNING: '%s' was not added to the '%s' SAN, because it is not a valid IP or RFC-1123 compliant DNS entry\n",

28
cmd/kubeadm/app/util/pkiutil/pki_helpers_test.go
View File

@ -704,3 +704,31 @@ func TestGetEtcdPeerAltNames(t *testing.T) {
})
}
}
func TestAppendSANsToAltNames(t *testing.T) {
var tests = []struct {
sans []string
expected int
}{
{[]string{}, 0},
{[]string{"abc"}, 1},
{[]string{"*.abc"}, 1},
{[]string{"**.abc"}, 0},
{[]string{"a.*.bc"}, 0},
{[]string{"a.*.bc", "abc.def"}, 1},
{[]string{"a*.bc", "abc.def"}, 1},
}
for _, rt := range tests {
altNames := certutil.AltNames{}
appendSANsToAltNames(&altNames, rt.sans, "foo")
actual := len(altNames.DNSNames)
if actual != rt.expected {
t.Errorf(
"failed AppendSANsToAltNames Numbers:\n\texpected: %d\n\t actual: %d",
rt.expected,
actual,
)
}
}
}