/
lint_ext_san_uri_host_not_fqdn_or_ip.go
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/
lint_ext_san_uri_host_not_fqdn_or_ip.go
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package lints
/*
* ZLint Copyright 2018 Regents of the University of Michigan
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
/*********************************************************************
When the subjectAltName extension contains a URI, the name MUST be
stored in the uniformResourceIdentifier (an IA5String). The name
MUST NOT be a relative URI, and it MUST follow the URI syntax and
encoding rules specified in [RFC3986]. The name MUST include both a
scheme (e.g., "http" or "ftp") and a scheme-specific-part. URIs that
include an authority ([RFC3986], Section 3.2) MUST include a fully
qualified domain name or IP address as the host. Rules for encoding
Internationalized Resource Identifiers (IRIs) are specified in
Section 7.4.
*********************************************************************/
import (
"github.com/zmap/zcrypto/x509"
"github.com/zmap/zlint/util"
"net/url"
)
type SANURIHost struct{}
func (l *SANURIHost) Initialize() error {
return nil
}
func (l *SANURIHost) CheckApplies(c *x509.Certificate) bool {
return util.IsExtInCert(c, util.SubjectAlternateNameOID)
}
func (l *SANURIHost) Execute(c *x509.Certificate) *LintResult {
for _, uri := range c.URIs {
if uri != "" {
parsed, err := url.Parse(uri)
if err != nil {
return &LintResult{Status: Error}
}
if parsed.Opaque == "" {
// if Opaque is not empty, that means there is no authority, which means that the URI is vacuously OK
if parsed.Host == "" {
return &LintResult{Status: Error}
}
if !util.IsFQDNOrIP(parsed.Host) {
return &LintResult{Status: Error}
}
}
}
}
return &LintResult{Status: Pass}
}
func init() {
RegisterLint(&Lint{
Name: "e_ext_san_uri_host_not_fqdn_or_ip",
Description: "URIs that include an authority ([RFC3986], Section 3.2) MUST include a fully qualified domain name or IP address as the host",
Citation: "RFC 5280: 4.2.1.7",
Source: RFC5280,
EffectiveDate: util.RFC5280Date,
Lint: &SANURIHost{},
})
}