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39
README.md
39
README.md
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# GoPass
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# GoPass
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An easy to use command-line password generator that creates secure passwords (Version 1.1 adds proper cryptographic seeding of math/rand)
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An easy to use command-line password generator that creates secure passwords
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# Usage:
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# Usage:
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<code>./gopass [number of characters]</code><br>
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`./gopass [number of characters]`<br>
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or <br>
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`./gopass [number of characters] -r=[excluded characters] [-s to remove all symbols]`
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<hr>
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<hr>
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eg:
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eg: `./gopass 32` <br>
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<code>./gopass 32</code><br>
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output: `E$bGOiiPASS*,ISl{!MJ&<\[COOL0eVw` <br>
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output: <code>E$bGOiiPASS*,ISl{!MJ&<\[COOL0eVw</code>
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eg: (with excluded characters): `./gopass 32 -r=$,!` <br>
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output: `EYbGOiiPASS*2ISl{?MJ&<\[COOL0eVw` <- note the excluded characters are not present in the output <br>
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eg: `./gopass 32 -s` <br>
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output: `LEYbGOiiPASS2ISlMJCOOL0eRt3KPOVw` <- note the symbols are not present in the output <br>
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eg: `./gopass 32 -r=$,! -s` the -r and -s flags can be combined <br>
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# How to install/use for Windows:
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1. Download Windows binary, it may be helpful to simply rename it to "gopass.exe" (make sure to add .exe, this won't
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need to
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be typed to execute the file from the CLI, but it is required for Windows to recognize the binary) to keep
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commands shorter.
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2. Move the file to your `C:\Users\[Username]` directory
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3. Opening the console *without* Administrator privileges will put you in the directory mentioned above by default
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4. Now type `gopass [number of characters]` (Ex. `gopass 64`) to generate a new password!
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# How to install/use for Linux:
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1. Download Linux binary, it may be helpful to simply rename it to "gopass" to keep commands shorter.
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2. Move the file to your home directory.
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3. `chmod +x gopass` if necessary
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3. Opening your terminal should put you in your home directory by default, if not, just type `cd` to get sent back to
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home.
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4. Now type `./gopass [number of characters]` (Ex. `./gopass 64`) to generate a new password!
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bin/gopass-amd64-linux
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bin/gopass-amd64-linux
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bin/gopass-amd64-osx
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bin/gopass-amd64-osx
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bin/gopass-amd64-windows
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bin/gopass-amd64-windows
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134
main.go
134
main.go
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// GoPass
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// GoPass
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// Author: Maximilian Patterson
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// Author: Maximilian Patterson
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// Version: 1.1
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package main
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package main
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import (
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import (
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"crypto/rand"
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cryptorand "crypto/rand"
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"encoding/binary"
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"fmt"
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"fmt"
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"math/big"
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mathrand "math/rand"
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"os"
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"os"
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"runtime"
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"strconv"
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"strconv"
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"strings"
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)
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)
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var allowedCharacters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890`~!@#$%^&*()_+[]\\{}|;':,./<>?")
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var runes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890`~!@#$%^&*()_+[]\\{}|;':,./<>?")
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const (
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func main() {
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Version = "1.3.1"
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// Take OS arg (only accepts one arg)
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symbols = "`~!@#$%^&*()_+[]\\{}|;':,./<>?"
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arg := os.Args[1]
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chunkSize = 16 // The size of each chunk of the password to be generated by the worker goroutines
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)
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func matchArguments(args []string) string {
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// Convert String arg to int
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// If there are no arguments
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size, err := strconv.Atoi(arg)
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if len(args) == 0 {
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if err != nil {
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return "No password length specified! (ex: gopass 16)"
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panic(err)
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}
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}
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// First argument is special, must be an integer, -v, or -h
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var size = 0 // Password length
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switch args[0] {
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case "-v":
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return "GoPass version " + Version
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case "-h":
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return "GoPass - A simple password generator written in Go\n" +
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"Usage: gopass [length] [disallowed characters] [optional remove symbols -s]\n" +
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" Example: gopass 16\n" +
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" Example: gopass 16 -r=abc123!@#\n" +
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" Example: gopass 16 -s\n" +
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"\nFor help (this output): gopass -h\n" +
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"For version: gopass -v\n"
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default:
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err := error(nil)
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size, err = strconv.Atoi(args[0])
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if err != nil {
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return "Invalid first argument (\"" + args[0] + "\") supplied! (Type gopass -h for help)"
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}
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}
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for i := 1; i < len(args); i++ {
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v := args[i]
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switch {
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case v == "-s":
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removeDisallowed([]rune(symbols))
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case strings.HasPrefix(v, "-r="):
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// Remove all characters after the = until next whitespace
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removeDisallowed([]rune(v[2:]))
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default:
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return "Invalid argument (\"" + v + "\") supplied! (Type gopass -h for help)"
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}
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}
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if size <= 0 {
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return "No/invalid password length specified! (ex: gopass 16)"
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} else {
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return generatePassword(size)
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}
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}
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// Remove all disallowed characters from the allowedCharacters slice
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func removeDisallowed(disallowed []rune) {
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disallowedMap := make(map[rune]bool, len(disallowed))
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for _, r := range disallowed {
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disallowedMap[r] = true
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}
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i := 0
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for _, v := range allowedCharacters {
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if !disallowedMap[v] {
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allowedCharacters[i] = v
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i++
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}
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}
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allowedCharacters = allowedCharacters[:i]
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}
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func generatePassword(size int) string {
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// Make empty array of runes with size of size
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// Make empty array of runes with size of size
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pass := make([]rune, size)
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pass := make([]rune, size)
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// Create a channel to receive chunks of the password
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// Seed rand with time
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passChan := make(chan []rune)
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var b [8]byte
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_, err = cryptorand.Read(b[:])
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if err != nil {
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panic("Error securely seeding rand!")
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}
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mathrand.Seed(int64(binary.LittleEndian.Uint64(b[:])))
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// Determine the number of worker goroutines to use
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// Assign every slot of pass to a random rune (generate rand int of length runes to select)
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numWorkers := runtime.NumCPU()
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for i := range pass {
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pass[i] = runes[mathrand.Intn(len(runes))]
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// Launch the worker goroutines
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for i := 0; i < numWorkers; i++ {
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go func() {
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allowedLen := len(allowedCharacters)
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for {
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// Generate a chunk of the password
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chunk := make([]rune, chunkSize)
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for i := range chunk {
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index, err := rand.Int(rand.Reader, big.NewInt(int64(allowedLen)))
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if err != nil {
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println("Error securely generating random character chunk!")
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return
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}
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chunk[i] = allowedCharacters[index.Int64()]
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}
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// Send the chunk of the password to the main goroutine
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passChan <- chunk
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}
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}()
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}
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}
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// Collect the chunks of the password from the channel
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// Print the pass :D
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for i := 0; i < size; i += chunkSize {
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fmt.Println(string(pass))
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chunk := <-passChan
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copy(pass[i:], chunk)
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}
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return string(pass)
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}
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func main() {
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// Process arguments
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fmt.Println(matchArguments(os.Args[1:]))
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}
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}
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87
makefile
87
makefile
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# The current version number of the program
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VERSION := 1.3.1
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# List of OS and architecture combinations to build
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BUILD_OS_ARCH := \
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darwin/amd64 \
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freebsd/386 \
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freebsd/amd64 \
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freebsd/arm \
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linux/386 \
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linux/amd64 \
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linux/arm \
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plan9/386 \
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plan9/amd64 \
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plan9/arm \
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windows/386 \
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windows/amd64 \
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windows/arm
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# Build all targets
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all: $(BUILD_OS_ARCH)
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# Build targets in the form of `OS/ARCH`
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darwin/amd64:
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GOOS=darwin \
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GOARCH=amd64 \
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go build -ldflags="-s -w" -o "gopass-darwin-amd64-$(VERSION)" main.go
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freebsd/386:
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GOOS=freebsd \
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GOARCH=386 \
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go build -ldflags="-s -w" -o "gopass-freebsd-386-$(VERSION)" main.go
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freebsd/amd64:
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GOOS=freebsd \
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GOARCH=amd64 \
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go build -ldflags="-s -w" -o "gopass-freebsd-amd64-$(VERSION)" main.go
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freebsd/arm:
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GOOS=freebsd \
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GOARCH=arm \
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go build -ldflags="-s -w" -o "gopass-freebsd-arm-$(VERSION)" main.go
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linux/386:
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GOOS=linux \
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GOARCH=386 \
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go build -ldflags="-s -w" -o "gopass-linux-386-$(VERSION)" main.go
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linux/amd64:
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GOOS=linux \
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GOARCH=amd64 \
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go build -ldflags="-s -w" -o "gopass-linux-amd64-$(VERSION)" main.go
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linux/arm:
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GOOS=linux \
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GOARCH=arm \
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go build -ldflags="-s -w" -o "gopass-linux-arm-$(VERSION)" main.go
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plan9/386:
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GOOS=plan9 \
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GOARCH=386 \
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go build -ldflags="-s -w" -o "gopass-plan9-386-$(VERSION)" main.go
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plan9/amd64:
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GOOS=plan9 \
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GOARCH=amd64 \
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go build -ldflags="-s -w" -o "gopass-plan9-amd64-$(VERSION)" main.go
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plan9/arm:
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GOOS=plan9 \
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GOARCH=arm \
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go build -ldflags="-s -w" -o "gopass-plan9-arm-$(VERSION)" main.go
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windows/386:
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GOOS=windows \
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GOARCH=386 \
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go build -ldflags="-s -w" -o "gopass-windows-386-$(VERSION)" main.go
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windows/amd64:
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GOOS=windows \
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GOARCH=amd64 \
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go build -ldflags="-s -w" -o "gopass-windows-amd64-$(VERSION)" main.go
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windows/arm:
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GOOS=windows \
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GOARCH=arm \
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go build -ldflags="-s -w" -o "gopass-windows-arm-$(VERSION)" main.go
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