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UserPassSession Authentication!!!

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This commit is contained in:
Rene Schallner 2023-05-09 04:35:59 +02:00
parent 645db5c8d0
commit 340b1ae3a8
9 changed files with 560 additions and 1 deletions
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4
README.md
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@ -47,6 +47,10 @@ Here's what works:
- **[cookies](examples/cookies/cookies.zig)**: a simple example sending
itself a cookie and responding with a session cookie.
- **[websockets](examples/websockets/)**: a simple websockets chat for the browser.
- **[Username/Password Session Authentication](./examples/userpass_session_auth/)**:
A convenience authenticator that redirects un-authenticated requests to a
login page and sends cookies containing session tokens based on
username/password pairs transmitted via POST request.
I'll continue wrapping more of facil.io's functionality and adding stuff to zap

1
build.zig
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@ -53,6 +53,7 @@ pub fn build(b: *std.build.Builder) !void {
.{ .name = "http_params", .src = "examples/http_params/http_params.zig" },
.{ .name = "cookies", .src = "examples/cookies/cookies.zig" },
.{ .name = "websockets", .src = "examples/websockets/websockets.zig" },
.{ .name = "userpass_session", .src = "examples/userpass_session_auth/userpass_session_auth.zig" },
}) |excfg| {
const ex_name = excfg.name;
const ex_src = excfg.src;

2
build.zig.zon
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@ -1,6 +1,6 @@
.{
.name = "zap",
.version = "0.0.16",
.version = "0.0.17",
.dependencies = .{
.@"facil.io" = .{

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examples/userpass_session_auth/html/Ziggy_the_Ziguana.svg.png Normal file
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90
examples/userpass_session_auth/html/login.html Normal file
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@ -0,0 +1,90 @@
<html>
<head>
<style>
/* Bordered form */
form {
border: 3px solid #f1f1f1;
}
/* Full-width inputs */
input[type=text], input[type=password] {
width: 100%;
padding: 12px 20px;
margin: 8px 0;
display: inline-block;
border: 1px solid #ccc;
box-sizing: border-box;
}
/* Set a style for all buttons */
button {
background-color: #04AA6D;
color: white;
padding: 14px 20px;
margin: 8px 0;
border: none;
cursor: pointer;
width: 100%;
}
/* Add a hover effect for buttons */
button:hover {
opacity: 0.8;
}
/* Extra style for the cancel button (red) */
.cancelbtn {
width: auto;
padding: 10px 18px;
background-color: #f44336;
}
/* Center the avatar image inside this container */
.imgcontainer {
text-align: center;
margin: 24px 0 12px 0;
}
/* Avatar image */
img.avatar {
width: 40%;
border-radius: 50%;
}
/* Add padding to containers */
.container {
padding: 16px;
}
/* Change styles for span and cancel button on extra small screens */
@media screen and (max-width: 300px) {
span.psw {
display: block;
float: none;
}
.cancelbtn {
width: 100%;
}
}
</style>
</head>
<body>
<form action="normal_page" method="post"> <!-- we post directly to the page we want to display if login is successful-->
<div class="imgcontainer">
<img src="/login/Ziggy_the_Ziguana.svg.png" alt="Avatar" class="avatar">
</div>
<div class="container">
<label for="username"><b>Username</b></label>
<input type="text" placeholder="Enter Username" name="username" required>
<label for="password"><b>Password</b></label>
<input type="password" placeholder="Enter Password" name="password" required>
<button type="submit">Login</button>
</div>
</form>
</body>
</html>

147
examples/userpass_session_auth/userpass_session_auth.zig Normal file
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@ -0,0 +1,147 @@
const std = @import("std");
const zap = @import("zap");
const Lookup = std.StringHashMap([]const u8);
const auth_lock_token_table = false;
const auth_lock_pw_table = false;
// see the source for more info
const Authenticator = zap.UserPassSessionAuth(
Lookup,
auth_lock_pw_table, // we may set this to true if we expect our username -> password map to change
auth_lock_token_table, // we may set this to true to have session tokens deleted server-side on logout
);
const loginpath = "/login";
const loginpage = @embedFile("html/login.html");
const img = @embedFile("./html/Ziggy_the_Ziguana.svg.png");
// global vars yeah!
var authenticator: Authenticator = undefined;
// the login page (embedded)
fn on_login(r: zap.SimpleRequest) void {
r.sendBody(loginpage) catch return;
}
// the "normal page"
fn on_normal_page(r: zap.SimpleRequest) void {
zap.debug("on_normal_page()\n", .{});
r.sendBody(
\\ <html><body>
\\ <h1>Hello from ZAP!!!</h1>
\\ <p>You are logged in!!!</>
\\ <center><a href="/logout">logout</a></center>
\\ </body></html>
) catch return;
}
// the logged-out page
fn on_logout(r: zap.SimpleRequest) void {
zap.debug("on_logout()\n", .{});
authenticator.logout(&r);
r.sendBody(
\\ <html><body>
\\ <p>You are logged out!!!</p>
\\ </body></html>
) catch return;
}
fn on_request(r: zap.SimpleRequest) void {
switch (authenticator.authenticateRequest(&r)) {
.Handled => {
// the authenticator handled the entire request for us. probably
// a redirect to the login page
std.log.info("Authenticator handled it", .{});
return;
},
.AuthFailed => unreachable,
.AuthOK => {
// the authenticator says it is ok to proceed as usual
std.log.info("Auth OK", .{});
// dispatch to target path
if (r.path) |p| {
// used in the login page
// note: our login page is /login
// so, anything that starts with /login will not be touched by
// the authenticator. Hence, we name the img /login/Ziggy....png
if (std.mem.startsWith(u8, p, "/login/Ziggy_the_Ziguana.svg.png")) {
std.log.info("Auth OK for img", .{});
r.setContentTypeFromPath() catch unreachable;
r.sendBody(img) catch unreachable;
return;
}
// aha! got redirected to /login
if (std.mem.startsWith(u8, p, loginpath)) {
std.log.info(" + for /login --> login page", .{});
return on_login(r);
}
// /logout can be shown since we're still authenticated for this
// very request
if (std.mem.startsWith(u8, p, "/logout")) {
std.log.info(" + for /logout --> logout page", .{});
return on_logout(r);
}
// any other paths will still show the normal page
std.log.info(" + --> normal page", .{});
return on_normal_page(r);
}
// if there is no path, we're still authenticated, so let's show
// the user something
return on_normal_page(r);
},
}
}
pub fn main() !void {
var gpa = std.heap.GeneralPurposeAllocator(.{
.thread_safe = true,
}){};
var allocator = gpa.allocator();
var listener = zap.SimpleHttpListener.init(.{
.port = 3000,
.on_request = on_request,
.log = true,
.max_clients = 100000,
});
try listener.listen();
zap.enableDebugLog();
// add a single user to our allowed users
var userpass = Lookup.init(allocator);
try userpass.put("zap", "awesome");
// init our auth
authenticator = try Authenticator.init(
allocator,
&userpass,
.{
.usernameParam = "username",
.passwordParam = "password",
.loginPage = loginpath,
.cookieName = "zap-session",
},
);
// just some debug output: listing the session tokens the authenticator may
// have generated already (if auth_lock_token_table == false).
const lookup = authenticator.sessionTokens;
std.debug.print("\nauth token list len: {d}\n", .{lookup.count()});
var it = lookup.iterator();
while (it.next()) |item| {
std.debug.print(" {s}\n", .{item.key_ptr.*});
}
std.debug.print("Visit me on http://127.0.0.1:3000\n", .{});
// start worker threads
zap.start(.{
.threads = 2,
.workers = 2,
});
}

305
src/http_auth.zig
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@ -300,3 +300,308 @@ pub fn BearerAuthMulti(comptime Lookup: type) type {
}
};
}
pub const UserPassSessionAuthArgs = struct {
/// username body parameter
usernameParam: []const u8,
/// password body parameter
passwordParam: []const u8,
/// redirect to this page if auth fails
loginPage: []const u8,
/// name of the cookie
cookieName: []const u8,
/// cookie max age in seconds; 0 -> session cookie
cookieMaxAge: u8 = 0,
/// redirect status code, defaults to 302 found
redirectCode: zap.StatusCode = .found,
};
/// UserPassSessionAuth supports the following use case:
///
/// - checks every request: is it going to the login page? -> let the request through.
/// - else:
/// - checks every request for a session token in a cookie
/// - if there is no token, it checks for correct username and password body params
/// - if username and password are present and correct, it will create a session token,
/// create a response cookie containing the token, and carry on with the request
/// - else it will redirect to the login page
/// - if the session token is present and correct: it will let the request through
/// - else: it will redirect to the login page
///
/// Please note the implications of this simple approach: IF YOU REUSE "username"
/// and "password" body params for anything else in your application, then the
/// mechanisms described above will kick in. For that reason: please know what you're
/// doing.
///
/// See UserPassSessionAuthArgs:
/// - username & password param names can be defined by you
/// - session cookie name and max-age can be defined by you
/// - login page and redirect code (.302) can be defined by you
///
/// Comptime Parameters:
///
/// - `Lookup` must implement .get([]const u8) -> []const u8 for user password retrieval
/// - `lockedPwLookups` : if true, accessing the provided Lookup instance will be protected
/// by a Mutex. You can access the mutex yourself via the `passwordLookupLock`.
/// - `lockedTokenLookups` : if true, accessing the internal token table will be protected
/// by a Mutex. You can access the mutex yourself via the `passwordLookupLock`.
///
/// Note: In order to be quick, you can set lockedTokenLookups to false.
/// -> we generate it on init() and leave it static
/// -> there is no way to 100% log out apart from re-starting the server
/// -> because: we send a cookie to the browser that invalidates the session cookie
/// -> another browser program with the page still open would still be able to use
/// -> the session. Which is kindof OK, but not as cool as erasing the token
/// -> on the server side which immediately block all other browsers as well.
pub fn UserPassSessionAuth(comptime Lookup: type, comptime lockedPwLookups: bool, comptime lockedTokenLookups: bool) type {
return struct {
allocator: std.mem.Allocator,
lookup: *Lookup,
settings: UserPassSessionAuthArgs,
// TODO: cookie store per user
sessionTokens: SessionTokenMap,
passwordLookupLock: std.Thread.Mutex = .{},
tokenLookupLock: std.Thread.Mutex = .{},
const Self = @This();
const SessionTokenMap = std.StringHashMap(void);
const Hash = std.crypto.hash.sha2.Sha256;
const Token = [Hash.digest_length * 2]u8;
pub fn init(
allocator: std.mem.Allocator,
lookup: *Lookup,
args: UserPassSessionAuthArgs,
) !Self {
var ret: Self = .{
.allocator = allocator,
.settings = .{
.usernameParam = try allocator.dupe(u8, args.usernameParam),
.passwordParam = try allocator.dupe(u8, args.passwordParam),
.loginPage = try allocator.dupe(u8, args.loginPage),
.cookieName = try allocator.dupe(u8, args.cookieName),
.cookieMaxAge = args.cookieMaxAge,
.redirectCode = args.redirectCode,
},
.lookup = lookup,
.sessionTokens = SessionTokenMap.init(allocator),
};
if (lockedTokenLookups == false) {
// we populate on init and forbid logout()
var it = lookup.iterator();
while (it.next()) |kv| {
// we iterate over all usernames and passwords, create tokens,
// and memorize the tokens
_ = try ret.createAndStoreSessionToken(kv.key_ptr.*, kv.value_ptr.*);
}
}
return ret;
}
/// Check for session token cookie, remove the token from the valid tokens
/// Note: only valid if lockedTokenLookups == true
pub fn logout(self: *Self, r: *const zap.SimpleRequest) void {
if (lockedTokenLookups == false) {
if (r.setCookie(.{
.name = self.settings.cookieName,
.value = "invalid",
.max_age_s = self.settings.cookieMaxAge,
})) {
zap.debug("logout ok\n", .{});
} else |err| {
zap.debug("logout cookie setting failed: {any}\n", .{err});
}
// @compileLog("WARNING! If lockedTokenLookups==false, logout() cannot erase the token from its internal, server-side list of valid tokens");
return;
} else {
zap.debug("logout cookie setting failed\n", .{});
}
// if we are allowed to lock the table, we can erase the list of valid tokens server-side
if (r.setCookie(.{
.name = self.settings.cookieName,
.value = "invalid",
.max_age_s = self.settings.cookieMaxAge,
})) {
zap.debug("logout ok\n", .{});
} else |err| {
zap.debug("logout cookie setting failed: {any}\n", .{err});
}
r.parseCookies();
// check for session cookie
if (r.getCookieStr(self.settings.cookieName, self.allocator, false)) |maybe_cookie| {
if (maybe_cookie) |cookie| {
defer cookie.deinit();
self.tokenLookupLock.lock();
defer self.tokenLookupLock.unlock();
// if cookie is a valid session, remove it!
_ = self.sessionTokens.remove(cookie);
}
} else |err| {
zap.debug("unreachable: UserPassSessionAuth.logout: {any}", .{err});
}
}
pub fn deinit(self: *const Self) void {
self.allocator.free(self.settings.usernameParam);
self.allocator.free(self.settings.passwordParam);
self.allocator.free(self.settings.loginPage);
self.allocator.free(self.settings.cookieName);
}
fn _internal_authenticateRequest(self: *Self, r: *const zap.SimpleRequest) AuthResult {
// if we're requesting the login page, let the request through
if (r.path) |p| {
if (std.mem.startsWith(u8, p, self.settings.loginPage)) {
return .AuthOK;
}
}
// parse body
r.parseBody() catch {
// zap.debug("warning: parseBody() failed in UserPassSessionAuth: {any}", .{err});
// this is not an error in case of e.g. gets with querystrings
};
r.parseCookies(false);
// check for session cookie
if (r.getCookieStr(self.settings.cookieName, self.allocator, false)) |maybe_cookie| {
if (maybe_cookie) |cookie| {
defer cookie.deinit();
// locked or unlocked token lookup
if (lockedTokenLookups) {
self.tokenLookupLock.lock();
defer self.tokenLookupLock.unlock();
if (self.sessionTokens.contains(cookie.str)) {
// cookie is a valid session!
zap.debug("Auth: COKIE IS OK!!!!: {s}\n", .{cookie.str});
return .AuthOK;
} else {
zap.debug("Auth: COKIE IS BAD!!!!: {s}\n", .{cookie.str});
}
} else {
if (self.sessionTokens.contains(cookie.str)) {
// cookie is a valid session!
zap.debug("Auth: COKIE IS OK!!!!: {s}\n", .{cookie.str});
return .AuthOK;
} else {
zap.debug("Auth: COKIE IS BAD!!!!: {s}\n", .{cookie.str});
}
}
}
} else |err| {
zap.debug("unreachable: could not check for cookie in UserPassSessionAuth: {any}", .{err});
}
// get params of username and password
if (r.getParamStr(self.settings.usernameParam, self.allocator, false)) |maybe_username| {
if (maybe_username) |*username| {
defer username.deinit();
if (r.getParamStr(self.settings.passwordParam, self.allocator, false)) |maybe_pw| {
if (maybe_pw) |*pw| {
defer pw.deinit();
// now check
const correct_pw_optional = brk: {
if (lockedPwLookups) {
self.passwordLookupLock.lock();
defer self.passwordLookupLock.unlock();
break :brk self.lookup.*.get(username.str);
} else {
break :brk self.lookup.*.get(username.str);
}
};
if (correct_pw_optional) |correct_pw| {
if (std.mem.eql(u8, pw.str, correct_pw)) {
// create session token
if (self.createAndStoreSessionToken(username.str, pw.str)) |token| {
// now set the cookie header
if (r.setCookie(.{
.name = self.settings.cookieName,
.value = token,
.max_age_s = self.settings.cookieMaxAge,
})) {
return .AuthOK;
} else |err| {
zap.debug("could not set session token: {any}", .{err});
}
} else |err| {
zap.debug("could not create session token: {any}", .{err});
}
// errors with token don't mean the auth itself wasn't OK
return .AuthOK;
}
}
}
} else |err| {
zap.debug("getParamSt() for password failed in UserPassSessionAuth: {any}", .{err});
return .AuthFailed;
}
}
} else |err| {
zap.debug("getParamSt() for user failed in UserPassSessionAuth: {any}", .{err});
return .AuthFailed;
}
return .AuthFailed;
}
pub fn authenticateRequest(self: *Self, r: *const zap.SimpleRequest) AuthResult {
switch (self._internal_authenticateRequest(r)) {
.AuthOK => {
// username and pass are ok -> created token, set header, caller can continue
return .AuthOK;
},
// this does not happen, just for completeness
.Handled => return .Handled,
// auth failed -> redirect
.AuthFailed => {
// we need to redirect and return .Handled
self.redirect(r) catch |err| {
// we just give up
zap.debug("redirect() failed in UserPassSessionAuth: {any}", .{err});
};
return .Handled;
},
}
}
fn redirect(self: *Self, r: *const zap.SimpleRequest) !void {
try r.redirectTo(self.settings.loginPage, self.settings.redirectCode);
}
fn createSessionToken(self: *Self, username: []const u8, password: []const u8) ![]const u8 {
var hasher = Hash.init(.{});
hasher.update(username);
hasher.update(password);
var digest: [Hash.digest_length]u8 = undefined;
hasher.final(&digest);
const token: Token = std.fmt.bytesToHex(digest, .lower);
const token_str = try self.allocator.dupe(u8, token[0..token.len]);
return token_str;
}
fn createAndStoreSessionToken(self: *Self, username: []const u8, password: []const u8) ![]const u8 {
const token = try self.createSessionToken(username, password);
// put locked or not
if (lockedTokenLookups) {
self.tokenLookupLock.lock();
defer self.tokenLookupLock.unlock();
if (!self.sessionTokens.contains(token)) {
try self.sessionTokens.put(token, {});
}
} else {
if (!self.sessionTokens.contains(token)) {
try self.sessionTokens.put(token, {});
}
}
return token;
}
};
}

7
src/zap.zig
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@ -97,6 +97,13 @@ pub const SimpleRequest = struct {
return self.setHeader("content-type", s);
}
// redirect to path with status code 302 by default
pub fn redirectTo(self: *const Self, path: []const u8, code: ?_module.StatusCode) HttpError!void {
self.setStatus(if (code) |status| status else .found);
try self.setHeader("Location", path);
try self.sendBody("moved");
}
/// shows how to use the logger
pub fn setContentTypeWithLogger(
self: *const Self,

5
targets.txt
View file

@ -7,4 +7,9 @@ endpoint
wrk
mustache
endpoint_auth
http_params
pkghash
cookies
websockets
userpass_session