67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
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package main
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import (
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"bytes"
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"fmt"
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"math/rand"
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pwgen "github.com/sethvargo/go-password/password"
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"golang.org/x/crypto/bcrypt"
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"golang.org/x/crypto/ssh/terminal"
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)
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type PasswordParam struct {
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Password string `name:"password" help:"The password to be set. Empty to prompt."`
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GeneratePassword bool `name:"generate-password" help:"If set, the password is auto generated."`
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GeneratePasswordLength int `name:"password-length" help:"If generate-password is set, this specified the length of the generated password." default:"32"`
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}
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func (p *PasswordParam) acquirePassword() (string, error) {
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if p.GeneratePassword {
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// math.rand is not secure. For determining the number of digits in a password
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// it should suffice, though. Beware that we expect here that we at least initialized
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// the seed somewhere.
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pw, err := pwgen.Generate(p.GeneratePasswordLength, rand.Intn(p.GeneratePasswordLength/2), 0, false, true)
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if err != nil {
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return "", fmt.Errorf("cannot generate password: %w", err)
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}
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p.Password = pw
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fmt.Printf("Password generated: %s\n", p.Password)
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}
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if p.Password == "" {
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fmt.Printf("Enter password: ")
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bytePassword, err := terminal.ReadPassword(0)
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if err != nil {
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fmt.Println()
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return "", fmt.Errorf("error reading password: %w", err)
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}
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fmt.Printf("\nRepeat password: ")
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bytePasswordRepeat, err := terminal.ReadPassword(0)
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if err != nil {
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fmt.Println()
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return "", fmt.Errorf("error reading password: %w", err)
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}
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fmt.Println()
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if !bytes.Equal(bytePassword, bytePasswordRepeat) {
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return "", fmt.Errorf("passwords do not match")
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}
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p.Password = string(bytePassword)
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}
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if p.Password == "" {
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return "", fmt.Errorf("empty password supplied")
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}
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hash, err := bcrypt.GenerateFromPassword([]byte(p.Password), 0)
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if err != nil {
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return "", fmt.Errorf("cannot hash password: %w", err)
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}
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return string(hash), nil
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}
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