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Check for DNS name validity

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This commit is contained in:
max furman 2022-08-15 23:03:18 -07:00
parent ae76d943c9
commit b7c2f6c482
1 changed files with 25 additions and 10 deletions
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35
acme/api/order.go
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@ -13,6 +13,7 @@ import (
"github.com/go-chi/chi"
"go.step.sm/crypto/randutil"
"go.step.sm/crypto/x509util"
"github.com/smallstep/certificates/acme"
"github.com/smallstep/certificates/api/render"
@ -33,12 +34,20 @@ func (n *NewOrderRequest) Validate() error {
return acme.NewError(acme.ErrorMalformedType, "identifiers list cannot be empty")
}
for _, id := range n.Identifiers {
if !(id.Type == acme.DNS || id.Type == acme.IP) {
switch id.Type {
case acme.IP:
if net.ParseIP(id.Value) == nil {
return acme.NewError(acme.ErrorMalformedType, "invalid IP address: %s", id.Value)
}
case acme.DNS:
value, _ := trimIfWildcard(id.Value)
if _, err := x509util.SanitizeName(value); err != nil {
return acme.NewError(acme.ErrorMalformedType, "invalid DNS name: %s", id.Value)
}
default:
return acme.NewError(acme.ErrorMalformedType, "identifier type unsupported: %s", id.Type)
}
if id.Type == acme.IP && net.ParseIP(id.Value) == nil {
return acme.NewError(acme.ErrorMalformedType, "invalid IP address: %s", id.Value)
}
// TODO(hs): add some validations for DNS domains?
// TODO(hs): combine the errors from this with allow/deny policy, like example error in https://datatracker.ietf.org/doc/html/rfc8555#section-6.7.1
}
@ -218,13 +227,19 @@ func newACMEPolicyEngine(eak *acme.ExternalAccountKey) (policy.X509Policy, error
return policy.NewX509PolicyEngine(eak.Policy)
}
func trimIfWildcard(value string) (string, bool) {
if strings.HasPrefix(value, "*.") {
return strings.TrimPrefix(value, "*."), true
}
return value, false
}
func newAuthorization(ctx context.Context, az *acme.Authorization) error {
if strings.HasPrefix(az.Identifier.Value, "*.") {
az.Wildcard = true
az.Identifier = acme.Identifier{
Value: strings.TrimPrefix(az.Identifier.Value, "*."),
Type: az.Identifier.Type,
}
value, isWildcard := trimIfWildcard(az.Identifier.Value)
az.Wildcard = isWildcard
az.Identifier = acme.Identifier{
Value: value,
Type: az.Identifier.Type,
}
chTypes := challengeTypes(az)