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// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package password
import (
"bytes"
"context"
"crypto/rand"
"errors"
"html/template"
"math/big"
"strings"
"sync"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/translation"
)
var (
ErrComplexity = errors.New("password not complex enough")
ErrMinLength = errors.New("password not long enough")
)
// complexity contains information about a particular kind of password complexity
type complexity struct {
ValidChars string
TrNameOne string
}
var (
matchComplexityOnce sync.Once
validChars string
requiredList []complexity
charComplexities = map[string]complexity{
"lower": {
`abcdefghijklmnopqrstuvwxyz`,
"form.password_lowercase_one",
},
"upper": {
`ABCDEFGHIJKLMNOPQRSTUVWXYZ`,
"form.password_uppercase_one",
},
"digit": {
`0123456789`,
"form.password_digit_one",
},
"spec": {
` !"#$%&'()*+,-./:;<=>?@[\]^_{|}~` + "`",
"form.password_special_one",
},
}
)
// NewComplexity for preparation
func NewComplexity() {
matchComplexityOnce.Do(func() {
setupComplexity(setting.PasswordComplexity)
})
}
func setupComplexity(values []string) {
if len(values) != 1 || values[0] != "off" {
for _, val := range values {
if complexity, ok := charComplexities[val]; ok {
validChars += complexity.ValidChars
requiredList = append(requiredList, complexity)
}
}
if len(requiredList) == 0 {
// No valid character classes found; use all classes as default
for _, complexity := range charComplexities {
validChars += complexity.ValidChars
requiredList = append(requiredList, complexity)
}
}
}
if validChars == "" {
// No complexities to check; provide a sensible default for password generation
validChars = charComplexities["lower"].ValidChars + charComplexities["upper"].ValidChars + charComplexities["digit"].ValidChars
}
}
// IsComplexEnough return True if password meets complexity settings
func IsComplexEnough(pwd string) bool {
NewComplexity()
if len(validChars) > 0 {
for _, req := range requiredList {
if !strings.ContainsAny(req.ValidChars, pwd) {
return false
}
}
}
return true
}
// Generate a random password
func Generate(n int) (string, error) {
NewComplexity()
buffer := make([]byte, n)
max := big.NewInt(int64(len(validChars)))
for {
for j := 0; j < n; j++ {
rnd, err := rand.Int(rand.Reader, max)
if err != nil {
return "", err
}
buffer[j] = validChars[rnd.Int64()]
}
if err := IsPwned(context.Background(), string(buffer)); err != nil {
if errors.Is(err, ErrIsPwned) {
continue
}
return "", err
}
if IsComplexEnough(string(buffer)) && string(buffer[0]) != " " && string(buffer[n-1]) != " " {
return string(buffer), nil
}
}
}
// BuildComplexityError builds the error message when password complexity checks fail
func BuildComplexityError(locale translation.Locale) template.HTML {
var buffer bytes.Buffer
buffer.WriteString(locale.TrString("form.password_complexity"))
buffer.WriteString("<ul>")
for _, c := range requiredList {
buffer.WriteString("<li>")
buffer.WriteString(locale.TrString(c.TrNameOne))
buffer.WriteString("</li>")
}
buffer.WriteString("</ul>")
return template.HTML(buffer.String())
}
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