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package constraints
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import (
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"crypto/x509"
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"fmt"
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"net"
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"net/url"
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)
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var oidExtensionNameConstraints = []int{2, 5, 29, 30}
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// ConstraintError is the typed error that will be returned if a constraint
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// error is found.
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type ConstraintError struct {
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Type string
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Name string
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Detail string
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}
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// Error implements the error interface.
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func (e ConstraintError) Error() string {
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return e.Detail
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}
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// Service implements a constraint validator for DNS names, IP addresses, Email
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// addresses and URIs.
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type Service struct {
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hasNameConstraints bool
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permittedDNSDomains []string
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excludedDNSDomains []string
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permittedIPRanges []*net.IPNet
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excludedIPRanges []*net.IPNet
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permittedEmailAddresses []string
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excludedEmailAddresses []string
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permittedURIDomains []string
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excludedURIDomains []string
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}
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// New creates a constraint validation service that contains the given chain of
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// certificates.
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func New(chain ...*x509.Certificate) *Service {
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s := new(Service)
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for _, crt := range chain {
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s.permittedDNSDomains = append(s.permittedDNSDomains, crt.PermittedDNSDomains...)
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s.excludedDNSDomains = append(s.excludedDNSDomains, crt.ExcludedDNSDomains...)
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s.permittedIPRanges = append(s.permittedIPRanges, crt.PermittedIPRanges...)
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s.excludedIPRanges = append(s.excludedIPRanges, crt.ExcludedIPRanges...)
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s.permittedEmailAddresses = append(s.permittedEmailAddresses, crt.PermittedEmailAddresses...)
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s.excludedEmailAddresses = append(s.excludedEmailAddresses, crt.ExcludedEmailAddresses...)
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s.permittedURIDomains = append(s.permittedURIDomains, crt.PermittedURIDomains...)
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s.excludedURIDomains = append(s.excludedURIDomains, crt.ExcludedURIDomains...)
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if !s.hasNameConstraints {
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for _, ext := range crt.Extensions {
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if ext.Id.Equal(oidExtensionNameConstraints) {
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s.hasNameConstraints = true
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break
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}
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}
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}
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}
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return s
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}
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// Validate checks the given names with the name constraints defined in the
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// service.
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func (s *Service) Validate(dnsNames []string, ipAddresses []net.IP, emailAddresses []string, uris []*url.URL) error {
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if !s.hasNameConstraints {
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return nil
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}
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for _, name := range dnsNames {
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if err := checkNameConstraints("DNS name", name, name, s.permittedDNSDomains, s.excludedDNSDomains,
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func(parsedName, constraint any) (bool, error) {
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return matchDomainConstraint(parsedName.(string), constraint.(string))
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},
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); err != nil {
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return err
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}
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}
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for _, ip := range ipAddresses {
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if err := checkNameConstraints("IP address", ip.String(), ip, s.permittedIPRanges, s.excludedIPRanges,
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func(parsedName, constraint any) (bool, error) {
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return matchIPConstraint(parsedName.(net.IP), constraint.(*net.IPNet))
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},
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); err != nil {
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return err
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}
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}
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for _, email := range emailAddresses {
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mailbox, ok := parseRFC2821Mailbox(email)
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if !ok {
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return fmt.Errorf("cannot parse rfc822Name %q", email)
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}
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if err := checkNameConstraints("Email address", email, mailbox, s.permittedEmailAddresses, s.excludedEmailAddresses,
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func(parsedName, constraint any) (bool, error) {
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return matchEmailConstraint(parsedName.(rfc2821Mailbox), constraint.(string))
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},
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); err != nil {
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return err
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}
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}
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for _, uri := range uris {
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if err := checkNameConstraints("URI", uri.String(), uri, s.permittedURIDomains, s.excludedURIDomains,
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func(parsedName, constraint any) (bool, error) {
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return matchURIConstraint(parsedName.(*url.URL), constraint.(string))
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},
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); err != nil {
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return err
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}
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}
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return nil
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}
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