ShareDAV/cmd_tools.go

92 lines
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Go
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2020-10-18 14:34:36 +02:00
// Copyright (c) 2020, Andreas Schneider
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the <organization> nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package main
import (
"bytes"
"fmt"
"math/rand"
pwgen "github.com/sethvargo/go-password/password"
"golang.org/x/crypto/bcrypt"
"golang.org/x/crypto/ssh/terminal"
)
type PasswordParam struct {
Password string `name:"password" help:"The password to be set. Empty to prompt."`
GeneratePassword bool `name:"generate-password" help:"If set, the password is auto generated."`
GeneratePasswordLength int `name:"password-length" help:"If generate-password is set, this specified the length of the generated password." default:"32"`
}
func (p *PasswordParam) acquirePassword() (string, error) {
if p.GeneratePassword {
// math.rand is not secure. For determining the number of digits in a password
// it should suffice, though. Beware that we expect here that we at least initialized
// the seed somewhere.
pw, err := pwgen.Generate(p.GeneratePasswordLength, rand.Intn(p.GeneratePasswordLength/2), 0, false, true)
if err != nil {
return "", fmt.Errorf("cannot generate password: %w", err)
}
p.Password = pw
fmt.Printf("Password generated: %s\n", p.Password)
}
if p.Password == "" {
fmt.Printf("Enter password: ")
bytePassword, err := terminal.ReadPassword(0)
if err != nil {
fmt.Println()
return "", fmt.Errorf("error reading password: %w", err)
}
fmt.Printf("\nRepeat password: ")
bytePasswordRepeat, err := terminal.ReadPassword(0)
if err != nil {
fmt.Println()
return "", fmt.Errorf("error reading password: %w", err)
}
fmt.Println()
if !bytes.Equal(bytePassword, bytePasswordRepeat) {
return "", fmt.Errorf("passwords do not match")
}
p.Password = string(bytePassword)
}
if p.Password == "" {
return "", fmt.Errorf("empty password supplied")
}
hash, err := bcrypt.GenerateFromPassword([]byte(p.Password), 0)
if err != nil {
return "", fmt.Errorf("cannot hash password: %w", err)
}
return string(hash), nil
}