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validation.go
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validation.go
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package validation
import (
"fmt"
"net/url"
"regexp"
"strings"
"k8s.io/kubernetes/pkg/api/validation"
"k8s.io/kubernetes/pkg/api/validation/path"
"k8s.io/kubernetes/pkg/serviceaccount"
"k8s.io/kubernetes/pkg/util/validation/field"
authorizerscopes "github.com/openshift/origin/pkg/authorization/authorizer/scope"
"github.com/openshift/origin/pkg/oauth/api"
uservalidation "github.com/openshift/origin/pkg/user/api/validation"
)
const MinTokenLength = 32
// PKCE [RFC7636] code challenge methods supported
// https://tools.ietf.org/html/rfc7636#section-4.3
const (
codeChallengeMethodPlain = "plain"
codeChallengeMethodSHA256 = "S256"
)
var CodeChallengeMethodsSupported = []string{codeChallengeMethodPlain, codeChallengeMethodSHA256}
func ValidateTokenName(name string, prefix bool) []string {
if reasons := path.ValidatePathSegmentName(name, prefix); len(reasons) != 0 {
return reasons
}
if len(name) < MinTokenLength {
return []string{fmt.Sprintf("must be at least %d characters long", MinTokenLength)}
}
return nil
}
func ValidateRedirectURI(redirect string) (bool, string) {
if len(redirect) == 0 {
return true, ""
}
u, err := url.Parse(redirect)
if err != nil {
return false, err.Error()
}
if len(u.Fragment) != 0 {
return false, "may not contain a fragment"
}
for _, s := range strings.Split(u.Path, "/") {
if s == "." {
return false, "may not contain a path segment of ."
}
if s == ".." {
return false, "may not contain a path segment of .."
}
}
return true, ""
}
func ValidateAccessToken(accessToken *api.OAuthAccessToken) field.ErrorList {
allErrs := validation.ValidateObjectMeta(&accessToken.ObjectMeta, false, ValidateTokenName, field.NewPath("metadata"))
allErrs = append(allErrs, ValidateClientNameField(accessToken.ClientName, field.NewPath("clientName"))...)
allErrs = append(allErrs, ValidateUserNameField(accessToken.UserName, field.NewPath("userName"))...)
allErrs = append(allErrs, ValidateScopes(accessToken.Scopes, field.NewPath("scopes"))...)
if len(accessToken.UserUID) == 0 {
allErrs = append(allErrs, field.Required(field.NewPath("userUID"), ""))
}
if ok, msg := ValidateRedirectURI(accessToken.RedirectURI); !ok {
allErrs = append(allErrs, field.Invalid(field.NewPath("redirectURI"), accessToken.RedirectURI, msg))
}
return allErrs
}
func ValidateAccessTokenUpdate(newToken, oldToken *api.OAuthAccessToken) field.ErrorList {
allErrs := validation.ValidateObjectMetaUpdate(&newToken.ObjectMeta, &oldToken.ObjectMeta, field.NewPath("metadata"))
copied := *oldToken
copied.ObjectMeta = newToken.ObjectMeta
return append(allErrs, validation.ValidateImmutableField(newToken, &copied, field.NewPath(""))...)
}
var codeChallengeRegex = regexp.MustCompile("^[a-zA-Z0-9._~-]{43,128}$")
func ValidateAuthorizeToken(authorizeToken *api.OAuthAuthorizeToken) field.ErrorList {
allErrs := validation.ValidateObjectMeta(&authorizeToken.ObjectMeta, false, ValidateTokenName, field.NewPath("metadata"))
allErrs = append(allErrs, ValidateClientNameField(authorizeToken.ClientName, field.NewPath("clientName"))...)
allErrs = append(allErrs, ValidateUserNameField(authorizeToken.UserName, field.NewPath("userName"))...)
allErrs = append(allErrs, ValidateScopes(authorizeToken.Scopes, field.NewPath("scopes"))...)
if len(authorizeToken.UserUID) == 0 {
allErrs = append(allErrs, field.Required(field.NewPath("userUID"), ""))
}
if ok, msg := ValidateRedirectURI(authorizeToken.RedirectURI); !ok {
allErrs = append(allErrs, field.Invalid(field.NewPath("redirectURI"), authorizeToken.RedirectURI, msg))
}
if len(authorizeToken.CodeChallenge) > 0 || len(authorizeToken.CodeChallengeMethod) > 0 {
switch {
case len(authorizeToken.CodeChallenge) == 0:
allErrs = append(allErrs, field.Required(field.NewPath("codeChallenge"), "required if codeChallengeMethod is specified"))
case !codeChallengeRegex.MatchString(authorizeToken.CodeChallenge):
allErrs = append(allErrs, field.Invalid(field.NewPath("codeChallenge"), authorizeToken.CodeChallenge, "must be 43-128 characters [a-zA-Z0-9.~_-]"))
}
switch authorizeToken.CodeChallengeMethod {
case "":
allErrs = append(allErrs, field.Required(field.NewPath("codeChallengeMethod"), "required if codeChallenge is specified"))
case codeChallengeMethodPlain, codeChallengeMethodSHA256:
// no-op, good
default:
allErrs = append(allErrs, field.NotSupported(field.NewPath("codeChallengeMethod"), authorizeToken.CodeChallengeMethod, CodeChallengeMethodsSupported))
}
}
return allErrs
}
func ValidateAuthorizeTokenUpdate(newToken, oldToken *api.OAuthAuthorizeToken) field.ErrorList {
allErrs := validation.ValidateObjectMetaUpdate(&newToken.ObjectMeta, &oldToken.ObjectMeta, field.NewPath("metadata"))
copied := *oldToken
copied.ObjectMeta = newToken.ObjectMeta
return append(allErrs, validation.ValidateImmutableField(newToken, &copied, field.NewPath(""))...)
}
func ValidateClient(client *api.OAuthClient) field.ErrorList {
allErrs := validation.ValidateObjectMeta(&client.ObjectMeta, false, validation.NameIsDNSSubdomain, field.NewPath("metadata"))
for i, redirect := range client.RedirectURIs {
if ok, msg := ValidateRedirectURI(redirect); !ok {
allErrs = append(allErrs, field.Invalid(field.NewPath("redirectURIs").Index(i), redirect, msg))
}
}
for i, restriction := range client.ScopeRestrictions {
allErrs = append(allErrs, ValidateScopeRestriction(restriction, field.NewPath("scopeRestrictions").Index(i))...)
}
return allErrs
}
func ValidateScopeRestriction(restriction api.ScopeRestriction, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
specifiers := 0
if len(restriction.ExactValues) > 0 {
specifiers = specifiers + 1
}
if restriction.ClusterRole != nil {
specifiers = specifiers + 1
}
if specifiers != 1 {
allErrs = append(allErrs, field.Invalid(fldPath, restriction, "exactly one of literals, clusterRole is required"))
return allErrs
}
switch {
case len(restriction.ExactValues) > 0:
for i, literal := range restriction.ExactValues {
if len(literal) == 0 {
allErrs = append(allErrs, field.Invalid(fldPath.Child("literals").Index(i), literal, "may not be empty"))
}
}
case restriction.ClusterRole != nil:
if len(restriction.ClusterRole.RoleNames) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Child("clusterRole", "roleNames"), "won't match anything"))
}
if len(restriction.ClusterRole.Namespaces) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Child("clusterRole", "namespaces"), "won't match anything"))
}
}
return allErrs
}
func ValidateClientUpdate(client *api.OAuthClient, oldClient *api.OAuthClient) field.ErrorList {
allErrs := field.ErrorList{}
allErrs = append(allErrs, ValidateClient(client)...)
allErrs = append(allErrs, validation.ValidateObjectMetaUpdate(&client.ObjectMeta, &oldClient.ObjectMeta, field.NewPath("metadata"))...)
return allErrs
}
func ValidateClientAuthorizationName(name string, prefix bool) []string {
if reasons := path.ValidatePathSegmentName(name, prefix); len(reasons) != 0 {
return reasons
}
lastColon := strings.Index(name, ":")
if lastColon <= 0 || lastColon >= len(name)-1 {
return []string{"must be in the format <userName>:<clientName>"}
}
return nil
}
func ValidateClientAuthorization(clientAuthorization *api.OAuthClientAuthorization) field.ErrorList {
allErrs := field.ErrorList{}
expectedName := fmt.Sprintf("%s:%s", clientAuthorization.UserName, clientAuthorization.ClientName)
metadataErrs := validation.ValidateObjectMeta(&clientAuthorization.ObjectMeta, false, ValidateClientAuthorizationName, field.NewPath("metadata"))
if len(metadataErrs) > 0 {
allErrs = append(allErrs, metadataErrs...)
} else if clientAuthorization.Name != expectedName {
allErrs = append(allErrs, field.Invalid(field.NewPath("metadata", "name"), clientAuthorization.Name, "must be in the format <userName>:<clientName>"))
}
allErrs = append(allErrs, ValidateClientNameField(clientAuthorization.ClientName, field.NewPath("clientName"))...)
allErrs = append(allErrs, ValidateUserNameField(clientAuthorization.UserName, field.NewPath("userName"))...)
allErrs = append(allErrs, ValidateScopes(clientAuthorization.Scopes, field.NewPath("scopes"))...)
if len(clientAuthorization.UserUID) == 0 {
allErrs = append(allErrs, field.Required(field.NewPath("useruid"), ""))
}
return allErrs
}
func ValidateClientAuthorizationUpdate(newAuth *api.OAuthClientAuthorization, oldAuth *api.OAuthClientAuthorization) field.ErrorList {
allErrs := ValidateClientAuthorization(newAuth)
allErrs = append(allErrs, validation.ValidateObjectMetaUpdate(&newAuth.ObjectMeta, &oldAuth.ObjectMeta, field.NewPath("metadata"))...)
if oldAuth.ClientName != newAuth.ClientName {
allErrs = append(allErrs, field.Invalid(field.NewPath("clientName"), newAuth.ClientName, "clientName is not a mutable field"))
}
if oldAuth.UserName != newAuth.UserName {
allErrs = append(allErrs, field.Invalid(field.NewPath("userName"), newAuth.UserName, "userName is not a mutable field"))
}
if oldAuth.UserUID != newAuth.UserUID {
allErrs = append(allErrs, field.Invalid(field.NewPath("userUID"), newAuth.UserUID, "userUID is not a mutable field"))
}
return allErrs
}
func ValidateClientNameField(value string, fldPath *field.Path) field.ErrorList {
if len(value) == 0 {
return field.ErrorList{field.Required(fldPath, "")}
} else if _, saName, err := serviceaccount.SplitUsername(value); err == nil {
if reasons := validation.ValidateServiceAccountName(saName, false); len(reasons) != 0 {
return field.ErrorList{field.Invalid(fldPath, value, strings.Join(reasons, ", "))}
}
} else if reasons := validation.NameIsDNSSubdomain(value, false); len(reasons) != 0 {
return field.ErrorList{field.Invalid(fldPath, value, strings.Join(reasons, ", "))}
}
return field.ErrorList{}
}
func ValidateUserNameField(value string, fldPath *field.Path) field.ErrorList {
if len(value) == 0 {
return field.ErrorList{field.Required(fldPath, "")}
} else if reasons := uservalidation.ValidateUserName(value, false); len(reasons) != 0 {
return field.ErrorList{field.Invalid(fldPath, value, strings.Join(reasons, ", "))}
}
return field.ErrorList{}
}
func ValidateScopes(scopes []string, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
for i, scope := range scopes {
illegalCharacter := false
// https://tools.ietf.org/html/rfc6749#section-3.3 (full list of allowed chars is %x21 / %x23-5B / %x5D-7E)
// for those without an ascii table, that's `!`, `#-[`, `]-~` inclusive.
for _, ch := range scope {
switch {
case ch == '!':
case ch >= '#' && ch <= '[':
case ch >= ']' && ch <= '~':
default:
allErrs = append(allErrs, field.Invalid(fldPath.Index(i), scope, fmt.Sprintf("%v not allowed", ch)))
illegalCharacter = true
}
}
if illegalCharacter {
continue
}
found := false
for _, evaluator := range authorizerscopes.ScopeEvaluators {
if !evaluator.Handles(scope) {
continue
}
found = true
if err := evaluator.Validate(scope); err != nil {
allErrs = append(allErrs, field.Invalid(fldPath.Index(i), scope, err.Error()))
break
}
}
if !found {
allErrs = append(allErrs, field.Invalid(fldPath.Index(i), scope, "no scope handler found"))
}
}
return allErrs
}
func ValidateOAuthRedirectReference(sref *api.OAuthRedirectReference) field.ErrorList {
allErrs := validation.ValidateObjectMeta(&sref.ObjectMeta, true, path.ValidatePathSegmentName, field.NewPath("metadata"))
return append(allErrs, validateRedirectReference(&sref.Reference)...)
}
func validateRedirectReference(ref *api.RedirectReference) field.ErrorList {
allErrs := field.ErrorList{}
if len(ref.Name) == 0 {
allErrs = append(allErrs, field.Required(field.NewPath("name"), "may not be empty"))
} else {
for _, msg := range path.ValidatePathSegmentName(ref.Name, false) {
allErrs = append(allErrs, field.Invalid(field.NewPath("name"), ref.Name, msg))
}
}
switch ref.Kind {
case "":
allErrs = append(allErrs, field.Required(field.NewPath("kind"), "may not be empty"))
case "Route":
// Valid, TODO add ingress once we support it and update error message
default:
allErrs = append(allErrs, field.Invalid(field.NewPath("kind"), ref.Kind, "must be Route"))
}
// TODO validate group once we start using it
return allErrs
}