mirror of https://gogs.blitter.com/RLabs/xs
129 lines
2.7 KiB
Go
129 lines
2.7 KiB
Go
// Util to generate/store passwords for users in a file akin to /etc/passwd
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// suitable for the demo hkexsh server, using bcrypt.
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package main
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import (
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"bytes"
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"encoding/csv"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/user"
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hkex "blitter.com/herradurakex"
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"github.com/jameskeane/bcrypt"
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)
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func main() {
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var pfName string
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var newpw string
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var confirmpw string
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var userName string
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flag.StringVar(&userName, "u", "", "username")
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flag.StringVar(&pfName, "f", "/etc/hkexsh.passwd", "passwd file")
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flag.Parse()
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var uname string
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if len(userName) == 0 {
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log.Println("specify username with -u")
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os.Exit(1)
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}
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u, err := user.Lookup(userName)
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if err != nil {
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log.Printf("Invalid user %s\n", userName)
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log.Fatal(err)
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}
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uname = u.Username
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fmt.Printf("New Password:")
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ab, err := hkex.ReadPassword(int(os.Stdin.Fd()))
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fmt.Printf("\r\n")
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if err != nil {
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log.Fatal(err)
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os.Exit(1)
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}
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newpw = string(ab)
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fmt.Printf("Confirm:")
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ab, err = hkex.ReadPassword(int(os.Stdin.Fd()))
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fmt.Printf("\r\n")
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if err != nil {
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log.Fatal(err)
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os.Exit(1)
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}
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confirmpw = string(ab)
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if confirmpw != newpw {
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log.Println("New passwords do not match.")
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os.Exit(1)
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}
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// generate a random salt with specific rounds of complexity
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// (default in jameskeane/bcrypt is 12 but we'll be explicit here)
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salt, err := bcrypt.Salt(12)
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if err != nil {
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fmt.Println("ERROR: bcrypt.Salt() failed.")
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os.Exit(2)
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}
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// hash and verify a password with explicit (random) salt
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hash, err := bcrypt.Hash(newpw, salt)
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if err != nil || !bcrypt.Match(newpw, hash) {
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fmt.Println("ERROR: bcrypt.Match() failed.")
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log.Fatal(err)
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}
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//fmt.Println("Salt:", salt, "Hash:", hash)
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b, err := ioutil.ReadFile(pfName)
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if err != nil {
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log.Fatal(err)
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}
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r := csv.NewReader(bytes.NewReader(b))
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r.Comma = ':'
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r.Comment = '#'
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r.FieldsPerRecord = 4 // username:salt:authCookie:disallowedCmdList (a,b,...)
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records, err := r.ReadAll()
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if err != nil {
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log.Fatal(err)
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}
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for i, _ := range records {
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//fmt.Println(records[i])
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if records[i][0] == uname {
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records[i][1] = salt
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records[i][2] = hash
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}
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//// csv lib doesn't preserve comment in record, so put it back
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//if records[i][0][0] == '!' {
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// records[i][0] = "#" + records[i][0]
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//}
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}
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outFile, err := ioutil.TempFile("", "hkexsh-passwd")
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if err != nil {
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log.Fatal(err)
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}
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w := csv.NewWriter(outFile)
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w.Comma = ':'
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//w.FieldsPerRecord = 4 // username:salt:authCookie:disallowedCmdList (a,b,...)
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w.Write([]string{"#username", "salt", "authCookie", "disallowedCmdList"})
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w.WriteAll(records)
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if err = w.Error(); err != nil {
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log.Fatal(err)
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}
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err = os.Remove(pfName)
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if err != nil {
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log.Fatal(err)
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}
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err = os.Rename(outFile.Name(), pfName)
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if err != nil {
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log.Fatal(err)
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}
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}
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