mirror of
https://github.com/BookStackApp/BookStack.git
synced 2024-12-13 22:43:39 +08:00
b18cee3dc4
Not yet tested, nor checked all response validations.
175 lines
5.7 KiB
PHP
175 lines
5.7 KiB
PHP
<?php
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namespace BookStack\Access\Oidc;
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class OidcJwtWithClaims implements ProvidesClaims
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{
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protected array $header;
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protected array $payload;
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protected string $signature;
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protected string $issuer;
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protected array $tokenParts = [];
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/**
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* @var array[]|string[]
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*/
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protected array $keys;
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public function __construct(string $token, string $issuer, array $keys)
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{
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$this->keys = $keys;
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$this->issuer = $issuer;
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$this->parse($token);
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}
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/**
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* Parse the token content into its components.
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*/
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protected function parse(string $token): void
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{
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$this->tokenParts = explode('.', $token);
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$this->header = $this->parseEncodedTokenPart($this->tokenParts[0]);
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$this->payload = $this->parseEncodedTokenPart($this->tokenParts[1] ?? '');
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$this->signature = $this->base64UrlDecode($this->tokenParts[2] ?? '') ?: '';
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}
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/**
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* Parse a Base64-JSON encoded token part.
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* Returns the data as a key-value array or empty array upon error.
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*/
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protected function parseEncodedTokenPart(string $part): array
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{
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$json = $this->base64UrlDecode($part) ?: '{}';
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$decoded = json_decode($json, true);
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return is_array($decoded) ? $decoded : [];
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}
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/**
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* Base64URL decode. Needs some character conversions to be compatible
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* with PHP's default base64 handling.
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*/
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protected function base64UrlDecode(string $encoded): string
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{
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return base64_decode(strtr($encoded, '-_', '+/'));
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}
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/**
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* Validate common parts of OIDC JWT tokens.
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*
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* @throws OidcInvalidTokenException
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*/
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protected function validateCommonTokenDetails(): bool
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{
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$this->validateTokenStructure();
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$this->validateTokenSignature();
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$this->validateCommonClaims();
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return true;
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}
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/**
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* Fetch a specific claim from this token.
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* Returns null if it is null or does not exist.
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*/
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public function getClaim(string $claim): mixed
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{
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return $this->payload[$claim] ?? null;
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}
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/**
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* Get all returned claims within the token.
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*/
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public function getAllClaims(): array
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{
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return $this->payload;
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}
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/**
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* Replace the existing claim data of this token with that provided.
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*/
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public function replaceClaims(array $claims): void
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{
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$this->payload = $claims;
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}
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/**
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* Validate the structure of the given token and ensure we have the required pieces.
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* As per https://datatracker.ietf.org/doc/html/rfc7519#section-7.2.
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*
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* @throws OidcInvalidTokenException
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*/
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protected function validateTokenStructure(): void
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{
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foreach (['header', 'payload'] as $prop) {
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if (empty($this->$prop) || !is_array($this->$prop)) {
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throw new OidcInvalidTokenException("Could not parse out a valid {$prop} within the provided token");
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}
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}
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if (empty($this->signature) || !is_string($this->signature)) {
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throw new OidcInvalidTokenException('Could not parse out a valid signature within the provided token');
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}
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}
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/**
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* Validate the signature of the given token and ensure it validates against the provided key.
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*
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* @throws OidcInvalidTokenException
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*/
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protected function validateTokenSignature(): void
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{
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if ($this->header['alg'] !== 'RS256') {
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throw new OidcInvalidTokenException("Only RS256 signature validation is supported. Token reports using {$this->header['alg']}");
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}
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$parsedKeys = array_map(function ($key) {
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try {
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return new OidcJwtSigningKey($key);
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} catch (OidcInvalidKeyException $e) {
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throw new OidcInvalidTokenException('Failed to read signing key with error: ' . $e->getMessage());
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}
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}, $this->keys);
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$parsedKeys = array_filter($parsedKeys);
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$contentToSign = $this->tokenParts[0] . '.' . $this->tokenParts[1];
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/** @var OidcJwtSigningKey $parsedKey */
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foreach ($parsedKeys as $parsedKey) {
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if ($parsedKey->verify($contentToSign, $this->signature)) {
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return;
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}
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}
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throw new OidcInvalidTokenException('Token signature could not be validated using the provided keys');
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}
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/**
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* Validate common claims for OIDC JWT tokens.
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* As per https://openid.net/specs/openid-connect-basic-1_0.html#IDTokenValidation
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* and https://openid.net/specs/openid-connect-core-1_0.html#UserInfoResponse
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*
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* @throws OidcInvalidTokenException
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*/
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public function validateCommonClaims(): void
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{
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// 1. The Issuer Identifier for the OpenID Provider (which is typically obtained during Discovery)
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// MUST exactly match the value of the iss (issuer) Claim.
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if (empty($this->payload['iss']) || $this->issuer !== $this->payload['iss']) {
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throw new OidcInvalidTokenException('Missing or non-matching token issuer value');
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}
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// 2. The Client MUST validate that the aud (audience) Claim contains its client_id value registered
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// at the Issuer identified by the iss (issuer) Claim as an audience. The ID Token MUST be rejected
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// if the ID Token does not list the Client as a valid audience.
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if (empty($this->payload['aud'])) {
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throw new OidcInvalidTokenException('Missing token audience value');
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}
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$aud = is_string($this->payload['aud']) ? [$this->payload['aud']] : $this->payload['aud'];
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if (!in_array($this->payload['aud'], $aud, true)) {
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throw new OidcInvalidTokenException('Token audience value did not match the expected client_id');
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}
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}
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}
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