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I write code with my bare hands

Matt Holt mholt

I write code with my bare hands
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On Twitter the other day, I was lamenting the state of OCSP stapling support on Linux servers, and got asked by several people to write-up what I think the requirements are for OCSP stapling support.

  1. Support for keeping a long-lived (disk) cache of OCSP responses.

    This should be fairly simple. Any restarting of the service shouldn't blow away previous responses that were obtained. This doesn't need to be disk, just stable - and disk is an easy stable storage for most server

mholt / passwordpwned.go
Created Aug 12, 2018
Use Go to check if a password has been pwned
View passwordpwned.go
// checkPasswordPwned checks if the password is "pwned" according
// to the API offered by (The password
// is not sent to their servers to do the check.)
// This function returns the number of times the password appears in
// their data set. A password is pwned, or compromised, if the return
// value is greater than 0.
// API Docs:
mholt / interface_spider.go
Created Aug 4, 2014
Crawls for interfaces and writes them to a file.
View interface_spider.go
package main
import (
gq ""
mholt / apply-license.bash
Created Mar 27, 2018
Apply the Apache 2.0 license to all your .go files
View apply-license.bash
FILES=$(find . -name "*.go" -not -path "./vendor/*" -type f)
for f in $FILES
echo "processing: $f"
ed -s $f << EOF
// Copyright YEAR YOU
mholt /
Last active Jul 9, 2019
How do you like your handler configs?

Caddy 2 HTTP handlers come in two flavors: middleware and responders.

  • Middleware are in the middle of a request chain; i.e. they have a next handler to invoke.
  • Responders are content origins, at the end of a request chain; i.e. there is no next handler. Any handlers defined after it would not be invoked.

Caveat: Sometimes a handler's role is ambiguous. For example, a caching handler would be middleware on a cache miss (it needs to invoke the upstream handlers for a response, then cache it), but on a cache hit it would be a responder, since no further handlers would be invoked (it would simply write the response).

View gen.go
// Handler that calls generate
func ok(w http.ResponseWriter, r *http.Request) {
// res := make([]int64, 0, 100000)
var res [100000]int64
// fmt.Println(suc)
// fmt.Printf("%T", res)
// fmt.Println(res[50])
fmt.Fprintf(w, "OK")
mholt /
Created Oct 18, 2019 — forked from sleevi/
CT Best Practices (April 2017)

CT For Server (Developers)


Similar to my advice regarding OCSP Stapling for servers/server developers, based on questions I've received about "CT best practices," I wanted to write something similar for those writing server software. That is, this isn't targeted at server operators, but for those writing software like Apache, nginx, Caddy, etc.

At the most basic level, the deployment of Certificate Transparency to date has largely tried to focus the burden on CAs, rather than on server developers. If the CA is doing everything right,

mholt / main.go
Created Oct 16, 2018 — forked from LiamHaworth/main.go
Example of run an interactive process on the current user from system service on windows (Golang)
View main.go
package main
import (
type Service struct {}
mholt / stringscontext.go
Last active Apr 14, 2020
Functions from the 'strings' package as template actions. Feel free to copy+paste into your project as a starting point.
View stringscontext.go
// Functions from Go's strings package usable as template actions
// with text/template.
// This approach assumes you have some context type as a receiver,
// but if you just need the functions check out the FuncMap variant
// below.
// Commented functions are not deemed useful in template actions.
// Haven't actually used this, but this is one possible way of doing it.
// Another option is to fill a FuncMap with most of the strings package.
mholt / everything.go
Last active Apr 14, 2020
Implements 103 of the 114 Go 1.3 standard library interfaces
View everything.go
package interfaces
import (
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