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Pod SecurityContext and PodSecurityPolicy supports slash as sysctl separator

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This commit is contained in:
Mengjiao Liu 2021-12-06 16:53:27 +08:00
parent 3beb8dc596
commit 20bb84b3f1
6 changed files with 40 additions and 102 deletions
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19
pkg/api/pod/util.go
View File

@ -329,20 +329,6 @@ func usesHugePagesInProjectedEnv(item api.Container) bool {
return false
}
// hasSysctlsWithSlashNames returns true if the sysctl name contains a slash, otherwise it returns false
func hasSysctlsWithSlashNames(podSpec *api.PodSpec) bool {
if podSpec.SecurityContext == nil {
return false
}
securityContext := podSpec.SecurityContext
for _, s := range securityContext.Sysctls {
if strings.Contains(s.Name, "/") {
return true
}
}
return false
}
func checkContainerUseIndivisibleHugePagesValues(container api.Container) bool {
for resourceName, quantity := range container.Resources.Limits {
if helper.IsHugePageResourceName(resourceName) {
@ -434,8 +420,6 @@ func GetValidationOptionsFromPodSpecAndMeta(podSpec, oldPodSpec *api.PodSpec, po
AllowExpandedDNSConfig: utilfeature.DefaultFeatureGate.Enabled(features.ExpandedDNSConfig) || haveSameExpandedDNSConfig(podSpec, oldPodSpec),
// Allow pod spec to use OS field
AllowOSField: utilfeature.DefaultFeatureGate.Enabled(features.IdentifyPodOS),
// The default sysctl value does not contain a forward slash, and in 1.24 we intend to relax this to be true by default
AllowSysctlRegexContainSlash: false,
}
if oldPodSpec != nil {
@ -457,9 +441,6 @@ func GetValidationOptionsFromPodSpecAndMeta(podSpec, oldPodSpec *api.PodSpec, po
// if old spec used non-integer multiple of huge page unit size, we must allow it
opts.AllowIndivisibleHugePagesValues = usesIndivisibleHugePagesValues(oldPodSpec)
// if old spec used use relaxed validation for Update requests where the existing object's sysctl contains a slash, we must allow it.
opts.AllowSysctlRegexContainSlash = hasSysctlsWithSlashNames(oldPodSpec)
}
if oldPodMeta != nil && !opts.AllowInvalidPodDeletionCost {
// This is an update, so validate only if the existing object was valid.

32
pkg/apis/core/validation/validation.go
View File

@ -3398,8 +3398,6 @@ type PodValidationOptions struct {
AllowExpandedDNSConfig bool
// Allow OSField to be set in the pod spec
AllowOSField bool
// Allow sysctl name to contain a slash
AllowSysctlRegexContainSlash bool
}
// validatePodMetadataAndSpec tests if required fields in the pod.metadata and pod.spec are set,
@ -4058,9 +4056,6 @@ const (
// a sysctl segment regex, concatenated with dots to form a sysctl name
SysctlSegmentFmt string = "[a-z0-9]([-_a-z0-9]*[a-z0-9])?"
// a sysctl name regex
SysctlFmt string = "(" + SysctlSegmentFmt + "\\.)*" + SysctlSegmentFmt
// a sysctl name regex with slash allowed
SysctlContainSlashFmt string = "(" + SysctlSegmentFmt + "[\\./])*" + SysctlSegmentFmt
@ -4068,41 +4063,28 @@ const (
SysctlMaxLength int = 253
)
var sysctlRegexp = regexp.MustCompile("^" + SysctlFmt + "$")
var sysctlContainSlashRegexp = regexp.MustCompile("^" + SysctlContainSlashFmt + "$")
// IsValidSysctlName checks that the given string is a valid sysctl name,
// i.e. matches SysctlFmt (or SysctlContainSlashFmt if canContainSlash is true).
// i.e. matches SysctlContainSlashFmt.
// More info:
// https://man7.org/linux/man-pages/man8/sysctl.8.html
// https://man7.org/linux/man-pages/man5/sysctl.d.5.html
func IsValidSysctlName(name string, canContainSlash bool) bool {
func IsValidSysctlName(name string) bool {
if len(name) > SysctlMaxLength {
return false
}
if canContainSlash {
return sysctlContainSlashRegexp.MatchString(name)
}
return sysctlRegexp.MatchString(name)
return sysctlContainSlashRegexp.MatchString(name)
}
func getSysctlFmt(canContainSlash bool) string {
if canContainSlash {
// use relaxed validation everywhere in 1.24
return SysctlContainSlashFmt
}
// Will be removed in 1.24
return SysctlFmt
}
func validateSysctls(sysctls []core.Sysctl, fldPath *field.Path, allowSysctlRegexContainSlash bool) field.ErrorList {
func validateSysctls(sysctls []core.Sysctl, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
names := make(map[string]struct{})
for i, s := range sysctls {
if len(s.Name) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Index(i).Child("name"), ""))
} else if !IsValidSysctlName(s.Name, allowSysctlRegexContainSlash) {
allErrs = append(allErrs, field.Invalid(fldPath.Index(i).Child("name"), s.Name, fmt.Sprintf("must have at most %d characters and match regex %s", SysctlMaxLength, getSysctlFmt(allowSysctlRegexContainSlash))))
} else if !IsValidSysctlName(s.Name) {
allErrs = append(allErrs, field.Invalid(fldPath.Index(i).Child("name"), s.Name, fmt.Sprintf("must have at most %d characters and match regex %s", SysctlMaxLength, sysctlContainSlashRegexp)))
} else if _, ok := names[s.Name]; ok {
allErrs = append(allErrs, field.Duplicate(fldPath.Index(i).Child("name"), s.Name))
}
@ -4142,7 +4124,7 @@ func ValidatePodSecurityContext(securityContext *core.PodSecurityContext, spec *
}
if len(securityContext.Sysctls) != 0 {
allErrs = append(allErrs, validateSysctls(securityContext.Sysctls, fldPath.Child("sysctls"), opts.AllowSysctlRegexContainSlash)...)
allErrs = append(allErrs, validateSysctls(securityContext.Sysctls, fldPath.Child("sysctls"))...)
}
if securityContext.FSGroupChangePolicy != nil {

53
pkg/apis/core/validation/validation_test.go
View File

@ -18261,6 +18261,8 @@ func TestIsValidSysctlName(t *testing.T) {
"a-b",
"abc",
"abc.def",
"a/b/c/d",
"a/b.c",
}
invalid := []string{
"",
@ -18285,6 +18287,10 @@ func TestIsValidSysctlName(t *testing.T) {
"a.abc*",
"a.b.*",
"Abc",
"/",
"/a",
"a/abc*",
"a/b/*",
func(n int) string {
x := make([]byte, n)
for i := range x {
@ -18294,34 +18300,13 @@ func TestIsValidSysctlName(t *testing.T) {
}(256),
}
containSlashesValid := []string{
"a/b/c/d",
"a/b.c",
}
containSlashesInvalid := []string{
"/",
"/a",
"a/abc*",
"a/b/*",
}
for _, s := range valid {
if !IsValidSysctlName(s, false) {
if !IsValidSysctlName(s) {
t.Errorf("%q expected to be a valid sysctl name", s)
}
}
for _, s := range invalid {
if IsValidSysctlName(s, false) {
t.Errorf("%q expected to be an invalid sysctl name", s)
}
}
for _, s := range containSlashesValid {
if !IsValidSysctlName(s, true) {
t.Errorf("%q expected to be a valid sysctl name", s)
}
}
for _, s := range containSlashesInvalid {
if IsValidSysctlName(s, true) {
if IsValidSysctlName(s) {
t.Errorf("%q expected to be an invalid sysctl name", s)
}
}
@ -18331,6 +18316,8 @@ func TestValidateSysctls(t *testing.T) {
valid := []string{
"net.foo.bar",
"kernel.shmmax",
"net.ipv4.conf.enp3s0/200.forwarding",
"net/ipv4/conf/enp3s0.200/forwarding",
}
invalid := []string{
"i..nvalid",
@ -18342,16 +18329,11 @@ func TestValidateSysctls(t *testing.T) {
"kernel.shmmax",
}
containSlashes := []string{
"net.ipv4.conf.enp3s0/200.forwarding",
"net/ipv4/conf/enp3s0.200/forwarding",
}
sysctls := make([]core.Sysctl, len(valid))
for i, sysctl := range valid {
sysctls[i].Name = sysctl
}
errs := validateSysctls(sysctls, field.NewPath("foo"), false)
errs := validateSysctls(sysctls, field.NewPath("foo"))
if len(errs) != 0 {
t.Errorf("unexpected validation errors: %v", errs)
}
@ -18360,7 +18342,7 @@ func TestValidateSysctls(t *testing.T) {
for i, sysctl := range invalid {
sysctls[i].Name = sysctl
}
errs = validateSysctls(sysctls, field.NewPath("foo"), false)
errs = validateSysctls(sysctls, field.NewPath("foo"))
if len(errs) != 2 {
t.Errorf("expected 2 validation errors. Got: %v", errs)
} else {
@ -18376,21 +18358,12 @@ func TestValidateSysctls(t *testing.T) {
for i, sysctl := range duplicates {
sysctls[i].Name = sysctl
}
errs = validateSysctls(sysctls, field.NewPath("foo"), false)
errs = validateSysctls(sysctls, field.NewPath("foo"))
if len(errs) != 1 {
t.Errorf("unexpected validation errors: %v", errs)
} else if errs[0].Type != field.ErrorTypeDuplicate {
t.Errorf("expected error type %v, got %v", field.ErrorTypeDuplicate, errs[0].Type)
}
sysctls = make([]core.Sysctl, len(containSlashes))
for i, sysctl := range containSlashes {
sysctls[i].Name = sysctl
}
errs = validateSysctls(sysctls, field.NewPath("foo"), true)
if len(errs) != 0 {
t.Errorf("unexpected validation errors: %v", errs)
}
}
func newNodeNameEndpoint(nodeName string) *core.Endpoints {

18
pkg/apis/policy/validation/validation.go
View File

@ -400,29 +400,21 @@ func validatePSPAllowedProcMountTypes(fldPath *field.Path, allowedProcMountTypes
const sysctlPatternSegmentFmt string = "([a-z0-9][-_a-z0-9]*)?[a-z0-9*]"
// SysctlPatternFmt is a regex used for matching valid sysctl patterns.
const SysctlPatternFmt string = "(" + apivalidation.SysctlSegmentFmt + "\\.)*" + sysctlPatternSegmentFmt
// SysctlContainSlashPatternFmt is a regex that contains a slash used for matching valid sysctl patterns.
const SysctlContainSlashPatternFmt string = "(" + apivalidation.SysctlSegmentFmt + "[\\./])*" + sysctlPatternSegmentFmt
var sysctlPatternRegexp = regexp.MustCompile("^" + SysctlPatternFmt + "$")
var sysctlContainSlashPatternRegexp = regexp.MustCompile("^" + SysctlContainSlashPatternFmt + "$")
// IsValidSysctlPattern checks if name is a valid sysctl pattern.
// i.e. matches sysctlPatternRegexp (or sysctlContainSlashPatternRegexp if canContainSlash is true).
// i.e. matches sysctlContainSlashPatternRegexp.
// More info:
// https://man7.org/linux/man-pages/man8/sysctl.8.html
// https://man7.org/linux/man-pages/man5/sysctl.d.5.html
func IsValidSysctlPattern(name string, canContainSlash bool) bool {
func IsValidSysctlPattern(name string) bool {
if len(name) > apivalidation.SysctlMaxLength {
return false
}
if canContainSlash {
return sysctlContainSlashPatternRegexp.MatchString(name)
}
return sysctlPatternRegexp.MatchString(name)
return sysctlContainSlashPatternRegexp.MatchString(name)
}
func validatePodSecurityPolicySysctlListsDoNotOverlap(allowedSysctlsFldPath, forbiddenSysctlsFldPath *field.Path, allowedUnsafeSysctls, forbiddenSysctls []string) field.ErrorList {
@ -478,12 +470,12 @@ func validatePodSecurityPolicySysctls(fldPath *field.Path, sysctls []string) fie
for i, s := range sysctls {
if len(s) == 0 {
allErrs = append(allErrs, field.Invalid(fldPath.Index(i), sysctls[i], "empty sysctl not allowed"))
} else if !IsValidSysctlPattern(string(s), false) {
} else if !IsValidSysctlPattern(string(s)) {
allErrs = append(
allErrs,
field.Invalid(fldPath.Index(i), sysctls[i], fmt.Sprintf("must have at most %d characters and match regex %s",
apivalidation.SysctlMaxLength,
SysctlPatternFmt,
SysctlContainSlashPatternFmt,
)),
)
} else if s[0] == '*' {

18
pkg/apis/policy/validation/validation_test.go
View File

@ -524,12 +524,12 @@ func TestValidatePodSecurityPolicy(t *testing.T) {
"invalid allowed unsafe sysctl pattern": {
psp: invalidAllowedUnsafeSysctlPattern,
errorType: field.ErrorTypeInvalid,
errorDetail: fmt.Sprintf("must have at most 253 characters and match regex %s", SysctlPatternFmt),
errorDetail: fmt.Sprintf("must have at most 253 characters and match regex %s", SysctlContainSlashPatternFmt),
},
"invalid forbidden sysctl pattern": {
psp: invalidForbiddenSysctlPattern,
errorType: field.ErrorTypeInvalid,
errorDetail: fmt.Sprintf("must have at most 253 characters and match regex %s", SysctlPatternFmt),
errorDetail: fmt.Sprintf("must have at most 253 characters and match regex %s", SysctlContainSlashPatternFmt),
},
"invalid overlapping sysctl pattern": {
psp: invalidOverlappingSysctls,
@ -805,6 +805,12 @@ func TestIsValidSysctlPattern(t *testing.T) {
"abc*",
"a.abc*",
"a.b.*",
"a/b/c/d",
"a/*",
"a/b/*",
"a.b/c*",
"a.b/c.d",
"a/b.c/d",
}
invalid := []string{
"",
@ -823,6 +829,10 @@ func TestIsValidSysctlPattern(t *testing.T) {
"a*b",
"*a",
"Abc",
"/",
"a/",
"/a",
"a*/b",
func(n int) string {
x := make([]byte, n)
for i := range x {
@ -832,12 +842,12 @@ func TestIsValidSysctlPattern(t *testing.T) {
}(256),
}
for _, s := range valid {
if !IsValidSysctlPattern(s, false) {
if !IsValidSysctlPattern(s) {
t.Errorf("%q expected to be a valid sysctl pattern", s)
}
}
for _, s := range invalid {
if IsValidSysctlPattern(s, false) {
if IsValidSysctlPattern(s) {
t.Errorf("%q expected to be an invalid sysctl pattern", s)
}
}

2
pkg/kubelet/sysctl/allowlist.go
View File

@ -48,7 +48,7 @@ func NewAllowlist(patterns []string) (*patternAllowlist, error) {
}
for _, s := range patterns {
if !policyvalidation.IsValidSysctlPattern(s, true) {
if !policyvalidation.IsValidSysctlPattern(s) {
return nil, fmt.Errorf("sysctl %q must have at most %d characters and match regex %s",
s,
validation.SysctlMaxLength,