zmap/zlint
GitHub: zmap/zlint
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# ZLint
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ZLint is a X.509 certificate linter written in Go that checks for consistency
with standards (e.g. [RFC 5280]) and other relevant PKI requirements (e.g.
[CA/Browser Forum Baseline Requirements][BR v1.4.8]).
It can be used as a command line tool or as a library integrated into CA
software.
## Requirements
ZLint requires [Go 1.16.x or newer](https://golang.org/doc/install) be
installed. The command line setup instructions assume the `go` command is in
your `$PATH`.
## Lint Sources
Historically ZLint was focused on only [RFC 5280] and [v1.4.8][BR v1.4.8] of the
[CA/Browser Forum baseline requirements][BRs]. A detailed list of the original
BR coverage can be found [in this spreadsheet][Coverage Spreadsheet].
More recently ZLint has been restructured to make it easier to add lints based
on other sources. While not complete, presently ZLint has lints sourced from:
* [CA/Browser Forum EV SSL Certificate Guidelines][CABF EV]
* [ETSI ESI]
* [Mozilla's PKI policy][MozPolicy]
* [Apple's CT policy][AppleCT]
* Various RFCs (e.g. [RFC 6818], [RFC 4055], [RFC 8399])
By default ZLint will apply applicable lints from all sources but consumers may
also customize which lints are used by including/exclduing specific sources.
## Versioning and Releases
Where possible we will try to make available a release candidate (RC) a week
before finalizing a production ready release tag. We encourage users to test RC
releases to provide feedback early enough for bugs to be addressed before the
final release is made available.
## Command Line Usage
ZLint can be used on the command-line through a simple bundled executable
_ZLint_ as well as through
[ZCertificate](https://github.com/zmap/zcertificate), a more full-fledged
command-line certificate parser that links against ZLint.
Example ZLint CLI usage:
go get github.com/zmap/zlint/v3/cmd/zlint
echo "Lint mycert.pem with all applicable lints"
zlint mycert.pem
echo "Lint mycert.pem with just the two named lints"
zlint -includeNames=e_mp_exponent_cannot_be_one,e_mp_modulus_must_be_divisible_by_8 mycert.pem
echo "List available lint sources"
zlint -list-lints-source
echo "Lint mycert.pem with all of the lints except for ETSI ESI sourced lints"
zlint -excludeSources=ETSI_ESI mycert.pem
echo "Receive a copy of the full (default) configuration for all configurable lints"
zlint -exampleConfig
echo "Lint mycert.pem using a custom configuration for any configurable lints"
zlint -config configFile.toml mycert.pem
echo "List available lint profiles. A profile is a pre-defined collection of lints."
zlint -list-profiles
See `zlint -h` for all available command line options.
### Linting Certificate Revocation Lists
No special flags are necessary when running lints against a certificate revocation list. However, the CRL in question MUST be a PEM encoded ASN.1 with the `X509 CRL` PEM armor.
The following is an example of a parseable CRL PEM file.
-----BEGIN X509 CRL-----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-----END X509 CRL-----
## Library Usage
ZLint can also be used as a library. To lint a certificate with all applicable
lints is as simple as using `zlint.LintCertificate` with a parsed certificate:
import (
"github.com/zmap/zcrypto/x509"
"github.com/zmap/zlint/v3"
)
var certDER []byte = ...
parsed, err := x509.ParseCertificate(certDER)
if err != nil {
// If x509.ParseCertificate fails, the certificate is too broken to lint.
// This should be treated as ZLint rejecting the certificate
log.Fatal("unable to parse certificate:", err)
}
zlintResultSet := zlint.LintCertificate(parsed)
To lint a certificate with a subset of lints (e.g. based on lint source, or
name) filter the global lint registry and use it with `zlint.LintCertificateEx`:
import (
"github.com/zmap/zcrypto/x509"
"github.com/zmap/zlint/v3"
"github.com/zmap/zlint/v3/lint"
)
var certDER []byte = ...
parsed, err := x509.ParseCertificate(certDER)
if err != nil {
// If x509.ParseCertificate fails, the certificate is too broken to lint.
// This should be treated as ZLint rejecting the certificate
log.Fatal("unable to parse certificate:", err)
}
registry, err := lint.GlobalRegistry().Filter(lint.FilterOptions{
ExcludeSources: []lint.LintSource{lint.EtsiEsi},
})
if err != nil {
log.Fatal("lint registry filter failed to apply:", err)
}
zlintResultSet := zlint.LintCertificateEx(parsed, registry)
To lint a certificate in the presence of a particular configuration file, you must first construct the configuration and then make a call to `SetConfiguration` in the `Registry` interface.
A `Configuration` may be constructed using any of the following functions:
* `lint.NewConfig(r io.Reader) (Configuration, error)`
* `lint.NewConfigFromFile(path string) (Configuration, error)`
* `lint.NewConfigFromString(config string) (Configuration, error)`
The contents of the input to all three constructors must be a valid TOML document.
import (
"github.com/zmap/zcrypto/x509"
"github.com/zmap/zlint/v3"
)
var certDER []byte = ...
parsed, err := x509.ParseCertificate(certDER)
if err != nil {
// If x509.ParseCertificate fails, the certificate is too broken to lint.
// This should be treated as ZLint rejecting the certificate
log.Fatal("unable to parse certificate:", err)
}
configuration, err := lint.NewConfigFromString(`
[some_configurable_lint]
IsWebPki = true
NumIterations = 42
[some_configurable_lint.AnySubMapping]
something = "else"
anything = "at all"
`)
if err != nil {
log.Fatal("unable to parse configuration:", err)
}
lint.GlobalRegistry().SetConfigutration(configuration)
zlintResultSet := zlint.LintCertificate(parsed)
See [the `zlint` command][zlint cmd]'s source code for an example.
## Extending ZLint
## Zlint Users/Integrations
Pre-issuance linting is **strongly recommended** by the [Mozilla root
program](https://wiki.allizom.org/CA/Required_or_Recommended_Practices#Pre-Issuance_Linting).
Here are some projects/CAs known to integrate with ZLint in some fashion:
* [Actalis](https://www.actalis.it/en/home.aspx)
* [ANF AC](https://www.anf.es/)
* [Camerfirma](https://www.camerfirma.com/)
* [CFSSL](https://github.com/cloudflare/cfssl)
* [Deutsche Telekom Security GmbH](https://www.telesec.de/en)
* [Digicert](https://www.digicert.com/)
* [EJBCA](https://download.primekey.com/docs/EJBCA-Enterprise/6_11_1/adminguide.html#Post%20Processing%20Validators%20(Pre-Certificate%20or%20Certificate%20Validation))
* [Entrust](https://www.entrust.com/)
* [Globalsign](https://www.globalsign.com/en/)
* [GoDaddy](https://www.godaddy.com)
* [Google Trust Services](https://pki.goog/)
* [Government of Spain, FNMT](http://www.fnmt.es/)
* [Izenpe](https://www.izenpe.eus/)
* [Let's Encrypt](https://letsencrypt.org) and [Boulder](https://github.com/letsencrypt/boulder)
* [Microsec](https://www.microsec.com/)
* [Microsoft](https://www.microsoft.com)
* [Nexus Certificate Manager](https://doc.nexusgroup.com/display/PUB/Smart+ID+Certificate+Manager)
* [QuoVadis](https://www.quovadisglobal.com/)
* [Sectigo](https://sectigo.com/), [crt.sh](https://crt.sh/), and [pkimetal](https://github.com/pkimetal/pkimetal)
* [Siemens](https://siemens.com/pki)
* [SSL.com](https://www.ssl.com/)
* [PKI Insights](https://www.codegic.com/pki-insights-health-monitoring-for-microsoft-ca/)
* [NETLOCK](https://www.netlock.hu/)
* [Disig](https://eidas.disig.sk/en/)
Please submit a pull request to update the README if you are aware of
another CA/project that uses zlint.
## License and Copyright
ZMap Copyright 2024 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 LICENSE for the specific
language governing permissions and limitations under the License.
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