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35 lines
1.3 KiB
PHP
35 lines
1.3 KiB
PHP
<?php
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/**
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* Class that represents a GPG signature that is claimed to sign the associated public key.
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*/
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class PublicKeySignature extends Record {
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protected $table = 'public_key_signature';
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/**
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* Perform basic validation that the signature at least looks like a valid signature and
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* retrieve the fingerprint and signing date.
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* We cannot check that the signature is actually a valid signature for the public key since we
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* would need to have the signing GPG public key on our keyring to do so.
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*/
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public function validate() {
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$gpg = new gnupg();
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// We assume that the pubkey file that was signed is equal to the uploaded pubkey + a single newline
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$line_endings = array("\n", "\r\n", "\r", ""); // Endings to try in order of expected likelihood
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foreach($line_endings as $line_ending) {
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$info = $gpg->verify($this->public_key->export().$line_ending, $this->signature);
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if(is_array($info)) {
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$sig = reset($info);
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if($sig['validity'] > 0) break;
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} else {
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throw new InvalidArgumentException("Signature doesn't seem valid");
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}
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}
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if($sig['validity'] == 0) {
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#throw new InvalidArgumentException("Signature doesn't validate against pubkey");
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}
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$this->fingerprint = $sig['fingerprint'];
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$this->sign_date = gmdate('Y-m-d H:i:s', $sig['timestamp']);
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}
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}
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