owenandClaude Sonnet 5
ba1f7c4c03
Self-contained HTTP/HTTPS/TCP/UDP reverse proxy manager written in Go, with SQLite storage, a Bootstrap 5 admin UI (Go templates, no JS framework), and a REST API under /api/v1. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QTXFrNP1imCW7jtfL5SZrw
79 lines
2.4 KiB
Go
79 lines
2.4 KiB
Go
// Package auth handles admin credential hashing, HTTP Basic Auth, API
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// tokens, and CSRF protection for the web UI.
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package auth
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import (
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"crypto/rand"
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"crypto/subtle"
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"encoding/base64"
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"errors"
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"fmt"
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"strings"
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"golang.org/x/crypto/argon2"
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)
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// Argon2id parameters. Tuned for a low-traffic single-admin login, not a
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// high-throughput multi-tenant service.
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const (
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argonTime = 1
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argonMemory = 64 * 1024 // KiB
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argonThreads = 4
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argonKeyLen = 32
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saltLen = 16
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)
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var ErrInvalidHash = errors.New("invalid password hash format")
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// HashPassword returns an encoded argon2id hash in the standard
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// $argon2id$v=19$m=...,t=...,p=...$salt$hash format.
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func HashPassword(password string) (string, error) {
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salt := make([]byte, saltLen)
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if _, err := rand.Read(salt); err != nil {
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return "", err
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}
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hash := argon2.IDKey([]byte(password), salt, argonTime, argonMemory, argonThreads, argonKeyLen)
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b64Salt := base64.RawStdEncoding.EncodeToString(salt)
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b64Hash := base64.RawStdEncoding.EncodeToString(hash)
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return fmt.Sprintf("$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s", argon2.Version, argonMemory, argonTime, argonThreads, b64Salt, b64Hash), nil
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}
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// VerifyPassword checks password against an encoded hash produced by
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// HashPassword, using constant-time comparison.
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func VerifyPassword(password, encoded string) (bool, error) {
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parts := strings.Split(encoded, "$")
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if len(parts) != 6 || parts[1] != "argon2id" {
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return false, ErrInvalidHash
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}
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var version int
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if _, err := fmt.Sscanf(parts[2], "v=%d", &version); err != nil {
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return false, ErrInvalidHash
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}
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var memory uint32
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var time uint32
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var threads uint8
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if _, err := fmt.Sscanf(parts[3], "m=%d,t=%d,p=%d", &memory, &time, &threads); err != nil {
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return false, ErrInvalidHash
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}
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salt, err := base64.RawStdEncoding.DecodeString(parts[4])
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if err != nil {
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return false, ErrInvalidHash
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}
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want, err := base64.RawStdEncoding.DecodeString(parts[5])
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if err != nil {
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return false, ErrInvalidHash
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}
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got := argon2.IDKey([]byte(password), salt, time, memory, threads, uint32(len(want)))
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return subtle.ConstantTimeCompare(got, want) == 1, nil
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}
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// GenerateRandomPassword returns a strong, human-typeable temporary
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// password (24 base64url characters, no padding).
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func GenerateRandomPassword() (string, error) {
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b := make([]byte, 18)
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if _, err := rand.Read(b); err != nil {
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return "", err
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}
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return base64.RawURLEncoding.EncodeToString(b), nil
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}
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