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Validate that projected files do not contain ..

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This was checked in the kubelet, but not at the API.
This commit is contained in:
Tim Hockin
2016-07-29 22:41:20 -07:00
parent 63602348a4
commit 9f2e13acca
2 changed files with 140 additions and 34 deletions
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70
pkg/api/validation/validation.go
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@@ -598,7 +598,7 @@ func validateGitRepoVolumeSource(gitRepo *api.GitRepoVolumeSource, fldPath *fiel
allErrs = append(allErrs, field.Required(fldPath.Child("repository"), ""))
}
pathErrs := validateVolumeSourcePath(gitRepo.Directory, fldPath.Child("directory"))
pathErrs := validateLocalDescendingPath(gitRepo.Directory, fldPath.Child("directory"))
allErrs = append(allErrs, pathErrs...)
return allErrs
}
@@ -660,6 +660,11 @@ func validateSecretVolumeSource(secretSource *api.SecretVolumeSource, fldPath *f
if len(secretSource.SecretName) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Child("secretName"), ""))
}
itemsPath := fldPath.Child("items")
for i, kp := range secretSource.Items {
itemPath := itemsPath.Index(i)
allErrs = append(allErrs, validateKeyToPath(&kp, itemPath)...)
}
return allErrs
}
@@ -668,6 +673,23 @@ func validateConfigMapVolumeSource(configMapSource *api.ConfigMapVolumeSource, f
if len(configMapSource.Name) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Child("name"), ""))
}
itemsPath := fldPath.Child("items")
for i, kp := range configMapSource.Items {
itemPath := itemsPath.Index(i)
allErrs = append(allErrs, validateKeyToPath(&kp, itemPath)...)
}
return allErrs
}
func validateKeyToPath(kp *api.KeyToPath, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
if len(kp.Key) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Child("key"), ""))
}
if len(kp.Path) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Child("path"), ""))
}
allErrs = append(allErrs, validateLocalNonReservedPath(kp.Path, fldPath.Child("path"))...)
return allErrs
}
@@ -723,7 +745,7 @@ func validateDownwardAPIVolumeSource(downwardAPIVolume *api.DownwardAPIVolumeSou
if len(downwardAPIVolumeFile.Path) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Child("path"), ""))
}
allErrs = append(allErrs, validateVolumeSourcePath(downwardAPIVolumeFile.Path, fldPath.Child("path"))...)
allErrs = append(allErrs, validateLocalNonReservedPath(downwardAPIVolumeFile.Path, fldPath.Child("path"))...)
if downwardAPIVolumeFile.FieldRef != nil {
allErrs = append(allErrs, validateObjectFieldSelector(downwardAPIVolumeFile.FieldRef, &validDownwardAPIFieldPathExpressions, fldPath.Child("fieldRef"))...)
if downwardAPIVolumeFile.ResourceFieldRef != nil {
@@ -740,44 +762,32 @@ func validateDownwardAPIVolumeSource(downwardAPIVolume *api.DownwardAPIVolumeSou
// This validate will make sure targetPath:
// 1. is not abs path
// 2. does not start with '../'
// 3. does not contain '/../'
// 4. does not end with '/..'
func validateSubPath(targetPath string, fldPath *field.Path) field.ErrorList {
// 2. does not have any element which is ".."
func validateLocalDescendingPath(targetPath string, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
if path.IsAbs(targetPath) {
allErrs = append(allErrs, field.Invalid(fldPath, targetPath, "must be a relative path"))
}
if strings.HasPrefix(targetPath, "../") {
allErrs = append(allErrs, field.Invalid(fldPath, targetPath, "must not start with '../'"))
}
if strings.Contains(targetPath, "/../") {
allErrs = append(allErrs, field.Invalid(fldPath, targetPath, "must not contain '/../'"))
}
if strings.HasSuffix(targetPath, "/..") {
allErrs = append(allErrs, field.Invalid(fldPath, targetPath, "must not end with '/..'"))
// TODO: this assumes the OS of apiserver & nodes are the same
parts := strings.Split(targetPath, string(os.PathSeparator))
for _, item := range parts {
if item == ".." {
allErrs = append(allErrs, field.Invalid(fldPath, targetPath, "must not contain '..'"))
}
}
return allErrs
}
// This validate will make sure targetPath:
// 1. is not abs path
// 2. does not contain '..'
// 2. does not contain any '..' elements
// 3. does not start with '..'
func validateVolumeSourcePath(targetPath string, fldPath *field.Path) field.ErrorList {
func validateLocalNonReservedPath(targetPath string, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
if path.IsAbs(targetPath) {
allErrs = append(allErrs, field.Invalid(fldPath, targetPath, "must be a relative path"))
}
// TODO assume OS of api server & nodes are the same for now
items := strings.Split(targetPath, string(os.PathSeparator))
for _, item := range items {
if item == ".." {
allErrs = append(allErrs, field.Invalid(fldPath, targetPath, "must not contain '..'"))
}
}
if strings.HasPrefix(items[0], "..") && len(items[0]) > 2 {
allErrs = append(allErrs, validateLocalDescendingPath(targetPath, fldPath)...)
// Don't report this error if the check for .. elements already caught it.
if strings.HasPrefix(targetPath, "..") && !strings.HasPrefix(targetPath, "../") {
allErrs = append(allErrs, field.Invalid(fldPath, targetPath, "must not start with '..'"))
}
return allErrs
@@ -1262,7 +1272,7 @@ func validateVolumeMounts(mounts []api.VolumeMount, volumes sets.String, fldPath
}
mountpoints.Insert(mnt.MountPath)
if len(mnt.SubPath) > 0 {
allErrs = append(allErrs, validateSubPath(mnt.SubPath, fldPath.Child("subPath"))...)
allErrs = append(allErrs, validateLocalDescendingPath(mnt.SubPath, fldPath.Child("subPath"))...)
}
}
return allErrs
@@ -1918,7 +1928,7 @@ func validateSeccompProfile(p string, fldPath *field.Path) field.ErrorList {
return nil
}
if strings.HasPrefix(p, "localhost/") {
return validateSubPath(strings.TrimPrefix(p, "localhost/"), fldPath)
return validateLocalDescendingPath(strings.TrimPrefix(p, "localhost/"), fldPath)
}
return field.ErrorList{field.Invalid(fldPath, p, "must be a valid seccomp profile")}
}