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security: enforce server-side registration string length and complexity filters (#345) #527

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security: enforce server-side registration string length and complexity filters (#345) #527

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security: enforce server-side registration string length and complexi…
prakshithamalla-art Jun 8, 2026
7cdc948
Merge branch 'main' into security/signup-password-validation
prakshithamalla-art Jun 8, 2026
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14 changes: 14 additions & 0 deletions backend/src/controllers/auth.controller.js
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,20 @@ const getGoogleClient = () => {
*/
export const signup = catchAsync(async (req, res) => {
const { name, email, password } = req.body;
try {
// STRICT PASSWORD VALIDATION GATEWAY
if (!password || password.length < 8) {
return res.status(400).json({ message: "Password must be at least 8 characters long" });
}

const complexityRegex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/;
if (!complexityRegex.test(password)) {
return res.status(400).json({
message: "Password must contain at least one uppercase letter, one lowercase letter, one number, and one special character"
});
}


const existing = await User.findOne({ email });
if (existing) {
return res.status(409).json({ message: "An account with this email already exists" });
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