| 1 | const crypto = require('crypto'); |
| 2 | const config = require('./config'); |
| 3 | |
| 4 | const COOKIE_NAME = 'otgit_sid'; |
| 5 | |
| 6 | function cookieSecure() { |
| 7 | const setting = config.get('security.cookieSecure'); |
| 8 | if (setting === 'true') return true; |
| 9 | if (setting === 'false') return false; |
| 10 | return /^https:/i.test(config.get('site.publicUrl') || ''); |
| 11 | } |
| 12 | |
| 13 | function hashPassword(password, salt) { |
| 14 | const N = config.get('auth.scryptN') || 16384; |
| 15 | const saltBuf = typeof salt === 'string' ? Buffer.from(salt, 'base64') : salt; |
| 16 | return crypto.scryptSync(String(password), saltBuf, 64, { N, r: 8, p: 1 }); |
| 17 | } |
| 18 | |
| 19 | function createPasswordRecord(password) { |
| 20 | const salt = crypto.randomBytes(16); |
| 21 | const hash = hashPassword(password, salt); |
| 22 | return { |
| 23 | passwordHash: hash.toString('base64'), |
| 24 | passwordSalt: salt.toString('base64') |
| 25 | }; |
| 26 | } |
| 27 | |
| 28 | function verifyPassword(candidate, record) { |
| 29 | if (!record || !record.passwordHash || !record.passwordSalt) return false; |
| 30 | let candidateHash; |
| 31 | try { |
| 32 | candidateHash = hashPassword(candidate, record.passwordSalt); |
| 33 | } catch { return false; } |
| 34 | const expected = Buffer.from(record.passwordHash, 'base64'); |
| 35 | if (candidateHash.length !== expected.length) return false; |
| 36 | return crypto.timingSafeEqual(candidateHash, expected); |
| 37 | } |
| 38 | |
| 39 | function sessionSecret() { |
| 40 | const s = config.get('auth.sessionSecret'); |
| 41 | const buf = Buffer.from(s || '', 'base64'); |
| 42 | if (buf.length < 16) throw new Error('auth.sessionSecret too short or missing. Run: node setup.js'); |
| 43 | return buf; |
| 44 | } |
| 45 | |
| 46 | function signSession(username) { |
| 47 | const issued = Date.now().toString(36); |
| 48 | const payload = username + '.' + issued; |
| 49 | const sig = crypto.createHmac('sha256', sessionSecret()).update(payload).digest('base64url'); |
| 50 | return payload + '.' + sig; |
| 51 | } |
| 52 | |
| 53 | function parseCookies(req) { |
| 54 | const out = {}; |
| 55 | const h = req.headers.cookie; |
| 56 | if (!h) return out; |
| 57 | for (const part of h.split(';')) { |
| 58 | const i = part.indexOf('='); |
| 59 | if (i < 0) continue; |
| 60 | const k = part.slice(0, i).trim(); |
| 61 | if (k) out[k] = decodeURIComponent(part.slice(i + 1).trim()); |
| 62 | } |
| 63 | return out; |
| 64 | } |
| 65 | |
| 66 | function getSession(req) { |
| 67 | const tok = parseCookies(req)[COOKIE_NAME]; |
| 68 | if (!tok) return null; |
| 69 | const i1 = tok.indexOf('.'); |
| 70 | const i2 = tok.lastIndexOf('.'); |
| 71 | if (i1 < 0 || i1 === i2) return null; |
| 72 | const username = tok.slice(0, i1); |
| 73 | const issued = tok.slice(i1 + 1, i2); |
| 74 | const sig = tok.slice(i2 + 1); |
| 75 | const expected = crypto.createHmac('sha256', sessionSecret()) |
| 76 | .update(username + '.' + issued).digest('base64url'); |
| 77 | const a = Buffer.from(sig); |
| 78 | const b = Buffer.from(expected); |
| 79 | if (a.length !== b.length || !crypto.timingSafeEqual(a, b)) return null; |
| 80 | return { username }; |
| 81 | } |
| 82 | |
| 83 | function setSessionCookie(res, username) { |
| 84 | const maxAge = (config.get('auth.sessionMaxAgeDays') || 365) * 86400; |
| 85 | const parts = [ |
| 86 | `${COOKIE_NAME}=${signSession(username)}`, |
| 87 | 'HttpOnly', |
| 88 | 'SameSite=Strict', |
| 89 | 'Path=/', |
| 90 | `Max-Age=${maxAge}` |
| 91 | ]; |
| 92 | if (cookieSecure()) parts.push('Secure'); |
| 93 | res.setHeader('Set-Cookie', parts.join('; ')); |
| 94 | } |
| 95 | |
| 96 | function clearSessionCookie(res) { |
| 97 | const parts = [`${COOKIE_NAME}=`, 'HttpOnly', 'SameSite=Strict', 'Path=/', 'Max-Age=0']; |
| 98 | if (cookieSecure()) parts.push('Secure'); |
| 99 | res.setHeader('Set-Cookie', parts.join('; ')); |
| 100 | } |
| 101 | |
| 102 | function requireAuth(req, res) { |
| 103 | const session = getSession(req); |
| 104 | if (!session) { |
| 105 | const respond = require('./respond'); |
| 106 | respond.unauthorized(res); |
| 107 | return null; |
| 108 | } |
| 109 | return session; |
| 110 | } |
| 111 | |
| 112 | module.exports = { |
| 113 | hashPassword, createPasswordRecord, verifyPassword, |
| 114 | signSession, getSession, setSessionCookie, clearSessionCookie, |
| 115 | requireAuth |
| 116 | }; |
| 117 | |
