83 lines
2.2 KiB
Go
83 lines
2.2 KiB
Go
// Package security provides password hashing and JWT issuing/verification
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// shared across auth modules.
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package security
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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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"fmt"
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"strings"
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"golang.org/x/crypto/argon2"
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)
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const (
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argon2Time = 3
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argon2Memory = 64 * 1024 // 64 MB
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argon2Threads = 2
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argon2SaltLen = 16
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argon2KeyLen = 32
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)
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// HashPassword hashes a plaintext password using argon2id and returns the
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// PHC-formatted string ($argon2id$v=19$m=...,t=...,p=...$salt$hash).
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func HashPassword(password string) (string, error) {
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salt := make([]byte, argon2SaltLen)
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if _, err := rand.Read(salt); err != nil {
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return "", fmt.Errorf("generate salt: %w", err)
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}
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hash := argon2.IDKey([]byte(password), salt, argon2Time, argon2Memory, argon2Threads, argon2KeyLen)
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encoded := fmt.Sprintf(
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"$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
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argon2.Version,
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argon2Memory,
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argon2Time,
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argon2Threads,
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base64.RawStdEncoding.EncodeToString(salt),
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base64.RawStdEncoding.EncodeToString(hash),
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)
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return encoded, nil
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}
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// VerifyPassword checks a plaintext password against a PHC-formatted argon2id hash.
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func VerifyPassword(encodedHash, password string) (bool, error) {
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parts := strings.Split(encodedHash, "$")
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if len(parts) != 6 || parts[1] != "argon2id" {
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return false, fmt.Errorf("invalid hash format")
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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, fmt.Errorf("invalid hash version segment: %w", err)
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}
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if version != argon2.Version {
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return false, fmt.Errorf("unsupported argon2 version: %d", version)
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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, fmt.Errorf("invalid hash params segment: %w", err)
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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, fmt.Errorf("decode salt: %w", err)
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}
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wantHash, err := base64.RawStdEncoding.DecodeString(parts[5])
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if err != nil {
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return false, fmt.Errorf("decode hash: %w", err)
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}
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gotHash := argon2.IDKey([]byte(password), salt, time, memory, threads, uint32(len(wantHash)))
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if subtle.ConstantTimeCompare(gotHash, wantHash) == 1 {
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return true, nil
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}
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return false, nil
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}
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