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fix: validate iat and nbf on payload #568

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Merged
bshaffer merged 5 commits into from
Apr 16, 2025
Merged

fix: validate iat and nbf on payload #568

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f4b20e0
fix: validate iat and nbf on payload
christiandavilakoobin Jun 19, 2024
2d901bd
Merge branch 'main' into main
bshaffer Apr 15, 2025
f0d5ea1
Remove unnecessary floor on comparation
Apr 16, 2025
aa46214
Add tests with JWT decode with invalid iat, nbf and exp properties
Apr 16, 2025
12fb412
clean up tests
bshaffer Apr 16, 2025
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12 changes: 11 additions & 1 deletion src/JWT.php
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Original file line number Diff line number Diff line change
Expand Up @@ -127,6 +127,16 @@ public static function decode(
if (!$payload instanceof stdClass) {
throw new UnexpectedValueException('Payload must be a JSON object');
}
if (isset($payload->iat) && !\is_numeric($payload->iat)) {
throw new UnexpectedValueException('Payload iat must be a number');
}
if (isset($payload->nbf) && !\is_numeric($payload->nbf)) {
throw new UnexpectedValueException('Payload nbf must be a number');
}
if (isset($payload->exp) && !\is_numeric($payload->exp)) {
throw new UnexpectedValueException('Payload exp must be a number');
}

$sig = static::urlsafeB64Decode($cryptob64);
if (empty($header->alg)) {
throw new UnexpectedValueException('Empty algorithm');
Expand Down Expand Up @@ -172,7 +182,7 @@ public static function decode(
}

// Check if this token has expired.
if (isset($payload->exp) && ($timestamp - static::$leeway) >= $payload->exp) {
if (isset($payload->exp) && floor($payload->exp) && ($timestamp - static::$leeway) >= $payload->exp) {
$ex = new ExpiredException('Expired token');
$ex->setPayload($payload);
throw $ex;
Expand Down