sop /
x509
Complex classes like PathValidator often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use PathValidator, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 18 | class PathValidator |
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| 19 | { |
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| 20 | /** |
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| 21 | * Crypto engine. |
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| 22 | * |
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| 23 | * @var Crypto $_crypto |
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| 24 | */ |
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| 25 | protected $_crypto; |
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| 26 | |||
| 27 | /** |
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| 28 | * Path validation configuration. |
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| 29 | * |
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| 30 | * @var PathValidationConfig $_config |
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| 31 | */ |
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| 32 | protected $_config; |
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| 33 | |||
| 34 | /** |
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| 35 | * Certification path. |
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| 36 | * |
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| 37 | * @var Certificate[] $_certificates |
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| 38 | */ |
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| 39 | protected $_certificates; |
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| 40 | |||
| 41 | /** |
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| 42 | * Certification path trust anchor. |
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| 43 | * |
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| 44 | * @var Certificate $_trustAnchor |
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| 45 | */ |
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| 46 | protected $_trustAnchor; |
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| 47 | |||
| 48 | /** |
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| 49 | * Constructor |
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| 50 | * |
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| 51 | * @param Crypto $crypto |
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| 52 | * @param PathValidationConfig $config |
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| 53 | * @param Certificate ...$certificates |
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| 54 | */ |
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| 55 | 46 | public function __construct(Crypto $crypto, PathValidationConfig $config, |
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| 56 | Certificate ...$certificates) { |
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| 57 | 46 | if (!count($certificates)) { |
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| 58 | 1 | throw new \LogicException("No certificates."); |
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| 59 | } |
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| 60 | 45 | $this->_crypto = $crypto; |
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| 61 | 45 | $this->_config = $config; |
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| 62 | 45 | $this->_certificates = $certificates; |
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| 63 | // if trust anchor is explicitly given in configuration |
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| 64 | 45 | if ($config->hasTrustAnchor()) { |
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| 65 | 1 | $this->_trustAnchor = $config->trustAnchor(); |
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| 66 | 1 | } else { |
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| 67 | 44 | $this->_trustAnchor = $certificates[0]; |
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| 68 | } |
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| 69 | 45 | } |
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| 70 | |||
| 71 | /** |
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| 72 | * Validate certification path. |
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| 73 | * |
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| 74 | * @throws PathValidationException |
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| 75 | * @return PathValidationResult |
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| 76 | */ |
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| 77 | 45 | public function validate() { |
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| 78 | 45 | $n = count($this->_certificates); |
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| 79 | 45 | $state = ValidatorState::initialize($this->_config, $this->_trustAnchor, |
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| 80 | 45 | $n); |
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| 81 | 45 | for ($i = 0; $i < $n; ++$i) { |
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| 82 | 44 | $state = $state->withIndex($i + 1); |
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| 83 | 44 | $cert = $this->_certificates[$i]; |
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| 84 | // process certificate (section 6.1.3.) |
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| 85 | 44 | $state = $this->_processCertificate($state, $cert); |
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| 86 | 43 | if (!$state->isFinal()) { |
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| 87 | // prepare next certificate (section 6.1.4.) |
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| 88 | 43 | $state = $this->_prepareNext($state, $cert); |
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| 89 | 39 | } |
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| 90 | 39 | } |
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| 91 | 31 | if (!isset($cert)) { |
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| 92 | 1 | throw new \LogicException("No certificates."); |
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| 93 | } |
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| 94 | // wrap-up (section 6.1.5.) |
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| 95 | 30 | $state = $this->_wrapUp($state, $cert); |
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| 96 | // return outputs |
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| 97 | 28 | return $state->getResult($this->_certificates); |
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| 98 | } |
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| 99 | |||
| 100 | /** |
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| 101 | * Apply basic certificate processing according to RFC 5280 section 6.1.3. |
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| 102 | * |
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| 103 | * @link https://tools.ietf.org/html/rfc5280#section-6.1.3 |
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| 104 | * @param ValidatorState $state |
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| 105 | * @param Certificate $cert |
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| 106 | * @throws PathValidationException |
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| 107 | * @return ValidatorState |
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| 108 | */ |
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| 109 | 44 | private function _processCertificate(ValidatorState $state, |
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| 110 | Certificate $cert) { |
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| 111 | // (a.1) verify signature |
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| 112 | 44 | $this->_verifySignature($state, $cert); |
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| 113 | // (a.2) check validity period |
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| 114 | 44 | $this->_checkValidity($cert); |
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| 115 | // (a.3) check that certificate is not revoked |
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| 116 | 43 | $this->_checkRevocation($cert); |
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| 117 | // (a.4) check issuer |
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| 118 | 43 | $this->_checkIssuer($state, $cert); |
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| 119 | // (b)(c) if certificate is self-issued and it is not |
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| 120 | // the final certificate in the path, skip this step |
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| 121 | 43 | if (!($cert->isSelfIssued() && !$state->isFinal())) { |
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| 122 | // (b) check permitted subtrees |
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| 123 | 35 | $this->_checkPermittedSubtrees($state, $cert); |
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| 124 | // (c) check excluded subtrees |
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| 125 | 35 | $this->_checkExcludedSubtrees($state, $cert); |
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| 126 | 35 | } |
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| 127 | 43 | $extensions = $cert->tbsCertificate()->extensions(); |
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| 128 | 43 | if ($extensions->hasCertificatePolicies()) { |
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| 129 | // (d) process policy information |
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| 130 | 26 | if ($state->hasValidPolicyTree()) { |
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| 131 | 14 | $state = $state->validPolicyTree()->processPolicies($state, |
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| 132 | 14 | $cert); |
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| 133 | 14 | } |
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| 134 | 26 | } else { |
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| 135 | // (e) certificate policies extension not present, |
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| 136 | // set the valid_policy_tree to NULL |
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| 137 | 31 | $state = $state->withoutValidPolicyTree(); |
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| 138 | } |
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| 139 | // (f) check that explicit_policy > 0 or valid_policy_tree is set |
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| 140 | 43 | if (!($state->explicitPolicy() > 0 || $state->hasValidPolicyTree())) { |
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| 141 | 3 | throw new PathValidationException("No valid policies."); |
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| 142 | } |
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| 143 | 43 | return $state; |
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| 144 | } |
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| 145 | |||
| 146 | /** |
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| 147 | * Apply preparation for the certificate i+1 according to rfc5280 section |
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| 148 | * 6.1.4. |
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| 149 | * |
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| 150 | * @link https://tools.ietf.org/html/rfc5280#section-6.1.4 |
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| 151 | * @param ValidatorState $state |
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| 152 | * @param Certificate $cert |
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| 153 | * @return ValidatorState |
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| 154 | */ |
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| 155 | 43 | private function _prepareNext(ValidatorState $state, Certificate $cert) { |
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| 156 | // (a)(b) if policy mappings extension is present |
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| 157 | 43 | $state = $this->_preparePolicyMappings($state, $cert); |
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| 158 | // (c) assign working_issuer_name |
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| 159 | 42 | $state = $state->withWorkingIssuerName( |
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| 160 | 42 | $cert->tbsCertificate() |
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| 161 | 42 | ->subject()); |
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| 162 | // (d)(e)(f) |
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| 163 | 42 | $state = $this->_setPublicKeyState($state, $cert); |
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| 164 | // (g) if name constraints extension is present |
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| 165 | 42 | $state = $this->_prepareNameConstraints($state, $cert); |
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| 166 | // (h) if certificate is not self-issued |
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| 167 | 42 | if (!$cert->isSelfIssued()) { |
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| 168 | 21 | $state = $this->_prepareNonSelfIssued($state); |
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| 169 | 21 | } |
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| 170 | // (i) if policy constraints extension is present |
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| 171 | 42 | $state = $this->_preparePolicyConstraints($state, $cert); |
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| 172 | // (j) if inhibit any policy extension is present |
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| 173 | 42 | $state = $this->_prepareInhibitAnyPolicy($state, $cert); |
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| 174 | // (k) check basic constraints |
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| 175 | 42 | $this->_processBasicContraints($cert); |
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| 176 | // (l) verify max_path_length |
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| 177 | 40 | $state = $this->_verifyMaxPathLength($state, $cert); |
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| 178 | // (m) check pathLenContraint |
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| 179 | 40 | $state = $this->_processPathLengthContraint($state, $cert); |
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| 180 | // (n) check key usage |
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| 181 | 40 | $this->_checkKeyUsage($cert); |
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| 182 | // (o) process relevant extensions |
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| 183 | 39 | $state = $this->_processExtensions($state, $cert); |
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| 184 | 39 | return $state; |
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| 185 | } |
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| 186 | |||
| 187 | /** |
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| 188 | * Apply wrap-up procedure according to RFC 5280 section 6.1.5. |
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| 189 | * |
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| 190 | * @link https://tools.ietf.org/html/rfc5280#section-6.1.5 |
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| 191 | * @param ValidatorState $state |
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| 192 | * @param Certificate $cert |
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| 193 | * @throws PathValidationException |
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| 194 | */ |
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| 195 | 30 | private function _wrapUp(ValidatorState $state, Certificate $cert) { |
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| 196 | 30 | $tbs_cert = $cert->tbsCertificate(); |
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| 197 | 30 | $extensions = $tbs_cert->extensions(); |
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| 198 | // (a) |
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| 199 | 30 | if ($state->explicitPolicy() > 0) { |
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| 200 | 26 | $state = $state->withExplicitPolicy($state->explicitPolicy() - 1); |
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| 201 | 26 | } |
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| 202 | // (b) |
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| 203 | 30 | if ($extensions->hasPolicyConstraints()) { |
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| 204 | 13 | $ext = $extensions->policyConstraints(); |
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| 205 | 13 | if ($ext->hasRequireExplicitPolicy() && |
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| 206 | 13 | $ext->requireExplicitPolicy() == 0) { |
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| 207 | 1 | $state = $state->withExplicitPolicy(0); |
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| 208 | 1 | } |
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| 209 | 13 | } |
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| 210 | // (c)(d)(e) |
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| 211 | 30 | $state = $this->_setPublicKeyState($state, $cert); |
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| 212 | // (f) process relevant extensions |
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| 213 | 30 | $state = $this->_processExtensions($state, $cert); |
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| 214 | // (g) intersection of valid_policy_tree and the initial-policy-set |
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| 215 | 30 | $state = $this->_calculatePolicyIntersection($state); |
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| 216 | // check that explicit_policy > 0 or valid_policy_tree is set |
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| 217 | 30 | if (!($state->explicitPolicy() > 0 || $state->hasValidPolicyTree())) { |
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| 218 | 2 | throw new PathValidationException("No valid policies."); |
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| 219 | } |
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| 220 | // path validation succeeded |
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| 221 | 28 | return $state; |
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| 222 | } |
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| 223 | |||
| 224 | /** |
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| 225 | * Update working_public_key, working_public_key_parameters and |
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| 226 | * working_public_key_algorithm state variables from certificate. |
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| 227 | * |
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| 228 | * @param ValidatorState $state |
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| 229 | * @param Certificate $cert |
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| 230 | * @return ValidatorState |
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| 231 | */ |
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| 232 | 42 | private function _setPublicKeyState(ValidatorState $state, Certificate $cert) { |
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| 253 | |||
| 254 | /** |
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| 255 | * Verify certificate signature. |
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| 256 | * |
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| 257 | * @param ValidatorState $state |
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| 258 | * @param Certificate $cert |
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| 259 | * @throws PathValidationException |
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| 260 | */ |
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| 261 | 44 | private function _verifySignature(ValidatorState $state, Certificate $cert) { |
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| 262 | try { |
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| 263 | 44 | $valid = $cert->verify($this->_crypto, $state->workingPublicKey()); |
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| 264 | 44 | } catch (\RuntimeException $e) { |
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| 265 | 1 | throw new PathValidationException( |
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| 266 | 1 | "Failed to verify signature: " . $e->getMessage(), null, $e); |
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| 267 | } |
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| 268 | 44 | if (!$valid) { |
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| 269 | 2 | throw new PathValidationException( |
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| 270 | 2 | "Certificate signature doesn't match."); |
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| 271 | } |
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| 272 | 44 | } |
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| 273 | |||
| 274 | /** |
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| 275 | * Check certificate validity. |
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| 276 | * |
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| 277 | * @param Certificate $cert |
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| 278 | * @throws PathValidationException |
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| 279 | */ |
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| 280 | 44 | private function _checkValidity(Certificate $cert) { |
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| 281 | 44 | $refdt = $this->_config->dateTime(); |
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| 282 | 44 | $validity = $cert->tbsCertificate()->validity(); |
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| 283 | 44 | if ($validity->notBefore() |
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| 284 | 44 | ->dateTime() |
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| 285 | 44 | ->diff($refdt)->invert) { |
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| 286 | 1 | throw new PathValidationException( |
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| 287 | 1 | "Certificate validity period has not started."); |
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| 288 | } |
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| 289 | 43 | if ($refdt->diff($validity->notAfter() |
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| 290 | 43 | ->dateTime())->invert) { |
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| 291 | 1 | throw new PathValidationException("Certificate has expired."); |
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| 292 | } |
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| 293 | 43 | } |
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| 294 | |||
| 295 | /** |
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| 296 | * Check certificate revocation. |
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| 297 | * |
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| 298 | * @param Certificate $cert |
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| 299 | */ |
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| 300 | 43 | private function _checkRevocation(Certificate $cert) { |
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| 301 | // @todo Implement CRL handling |
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| 302 | 43 | } |
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| 303 | |||
| 304 | /** |
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| 305 | * Check certificate issuer. |
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| 306 | * |
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| 307 | * @param ValidatorState $state |
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| 308 | * @param Certificate $cert |
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| 309 | * @throws PathValidationException |
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| 310 | */ |
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| 311 | 43 | private function _checkIssuer(ValidatorState $state, Certificate $cert) { |
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| 312 | 43 | if (!$cert->tbsCertificate() |
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| 313 | 43 | ->issuer() |
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| 314 | 43 | ->equals($state->workingIssuerName())) { |
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| 315 | 1 | throw new PathValidationException("Certification issuer mismatch."); |
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| 316 | } |
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| 317 | 43 | } |
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| 318 | |||
| 319 | /** |
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| 320 | * |
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| 321 | * @param ValidatorState $state |
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| 322 | * @param Certificate $cert |
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| 323 | */ |
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| 324 | 35 | private function _checkPermittedSubtrees(ValidatorState $state, |
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| 325 | Certificate $cert) { |
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| 326 | // @todo Implement |
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| 327 | 35 | $state->permittedSubtrees(); |
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| 328 | 35 | } |
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| 329 | |||
| 330 | /** |
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| 331 | * |
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| 332 | * @param ValidatorState $state |
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| 333 | * @param Certificate $cert |
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| 334 | */ |
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| 335 | 35 | private function _checkExcludedSubtrees(ValidatorState $state, |
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| 336 | Certificate $cert) { |
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| 337 | // @todo Implement |
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| 338 | 35 | $state->excludedSubtrees(); |
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| 339 | 35 | } |
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| 340 | |||
| 341 | /** |
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| 342 | * Apply policy mappings handling for the preparation step. |
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| 343 | * |
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| 344 | * @param ValidatorState $state |
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| 345 | * @param Certificate $cert |
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| 346 | * @throws PathValidationException |
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| 347 | * @return ValidatorState |
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| 348 | */ |
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| 349 | 43 | private function _preparePolicyMappings(ValidatorState $state, |
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| 350 | Certificate $cert) { |
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| 351 | 43 | $extensions = $cert->tbsCertificate()->extensions(); |
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| 352 | 43 | if ($extensions->hasPolicyMappings()) { |
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| 353 | // (a) verify that anyPolicy mapping is not used |
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| 354 | 4 | if ($extensions->policyMappings()->hasAnyPolicyMapping()) { |
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| 355 | 1 | throw new PathValidationException("anyPolicy mapping found."); |
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| 356 | } |
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| 357 | // (b) process policy mappings |
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| 358 | 3 | if ($state->hasValidPolicyTree()) { |
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| 359 | 3 | $state = $state->validPolicyTree()->processMappings($state, |
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| 360 | 3 | $cert); |
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| 361 | 3 | } |
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| 362 | 3 | } |
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| 363 | 42 | return $state; |
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| 364 | } |
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| 365 | |||
| 366 | /** |
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| 367 | * Apply name constraints handling for the preparation step. |
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| 368 | * |
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| 369 | * @param ValidatorState $state |
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| 370 | * @param Certificate $cert |
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| 371 | * @return ValidatorState |
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| 372 | */ |
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| 373 | 42 | private function _prepareNameConstraints(ValidatorState $state, |
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| 374 | Certificate $cert) { |
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| 375 | 42 | $extensions = $cert->tbsCertificate()->extensions(); |
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| 376 | 42 | if ($extensions->hasNameConstraints()) { |
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| 377 | 1 | $state = $this->_processNameConstraints($state, $cert); |
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| 378 | 1 | } |
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| 379 | 42 | return $state; |
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| 380 | } |
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| 381 | |||
| 382 | /** |
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| 383 | * Apply preparation for a non-self-signed certificate. |
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| 384 | * |
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| 385 | * @param ValidatorState $state |
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| 386 | * @return ValidatorState |
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| 387 | */ |
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| 388 | 21 | private function _prepareNonSelfIssued(ValidatorState $state) { |
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| 389 | // (h.1) |
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| 390 | 21 | if ($state->explicitPolicy() > 0) { |
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| 391 | 20 | $state = $state->withExplicitPolicy($state->explicitPolicy() - 1); |
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| 392 | 20 | } |
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| 393 | // (h.2) |
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| 394 | 21 | if ($state->policyMapping() > 0) { |
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| 395 | 20 | $state = $state->withPolicyMapping($state->policyMapping() - 1); |
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| 396 | 20 | } |
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| 397 | // (h.3) |
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| 398 | 21 | if ($state->inhibitAnyPolicy() > 0) { |
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| 399 | 21 | $state = $state->withInhibitAnyPolicy( |
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| 400 | 21 | $state->inhibitAnyPolicy() - 1); |
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| 401 | 21 | } |
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| 402 | 21 | return $state; |
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| 403 | } |
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| 404 | |||
| 405 | /** |
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| 406 | * Apply policy constraints handling for the preparation step. |
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| 407 | * |
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| 408 | * @param ValidatorState $state |
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| 409 | * @param Certificate $cert |
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| 410 | * @return ValidatorState |
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| 411 | */ |
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| 412 | 42 | private function _preparePolicyConstraints(ValidatorState $state, |
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| 413 | Certificate $cert) { |
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| 414 | 42 | $extensions = $cert->tbsCertificate()->extensions(); |
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| 415 | 42 | if (!$extensions->hasPolicyConstraints()) { |
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| 416 | 41 | return $state; |
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| 417 | } |
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| 418 | 2 | $ext = $extensions->policyConstraints(); |
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| 419 | // (i.1) |
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| 420 | 2 | if ($ext->hasRequireExplicitPolicy() && |
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| 421 | 2 | $ext->requireExplicitPolicy() < $state->explicitPolicy()) { |
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| 422 | 2 | $state = $state->withExplicitPolicy($ext->requireExplicitPolicy()); |
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| 423 | 2 | } |
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| 424 | // (i.2) |
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| 425 | 2 | if ($ext->hasInhibitPolicyMapping() && |
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| 426 | 2 | $ext->inhibitPolicyMapping() < $state->policyMapping()) { |
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| 427 | 1 | $state = $state->withPolicyMapping($ext->inhibitPolicyMapping()); |
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| 428 | 1 | } |
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| 429 | 2 | return $state; |
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| 430 | } |
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| 431 | |||
| 432 | /** |
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| 433 | * Apply inhibit any-policy handling for the preparation step. |
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| 434 | * |
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| 435 | * @param ValidatorState $state |
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| 436 | * @param Certificate $cert |
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| 437 | * @return ValidatorState |
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| 438 | */ |
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| 439 | 42 | private function _prepareInhibitAnyPolicy(ValidatorState $state, |
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| 440 | Certificate $cert) { |
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| 441 | 42 | $extensions = $cert->tbsCertificate()->extensions(); |
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| 442 | 42 | if ($extensions->hasInhibitAnyPolicy()) { |
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| 443 | 2 | $ext = $extensions->inhibitAnyPolicy(); |
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| 444 | 2 | if ($ext->skipCerts() < $state->inhibitAnyPolicy()) { |
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| 445 | 2 | $state = $state->withInhibitAnyPolicy($ext->skipCerts()); |
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| 446 | 2 | } |
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| 447 | 2 | } |
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| 448 | 42 | return $state; |
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| 449 | } |
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| 450 | |||
| 451 | /** |
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| 452 | * Verify maximum certification path length for the preparation step. |
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| 453 | * |
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| 454 | * @param ValidatorState $state |
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| 455 | * @param Certificate $cert |
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| 456 | * @throws PathValidationException |
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| 457 | * @return ValidatorState |
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| 458 | */ |
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| 459 | 40 | private function _verifyMaxPathLength(ValidatorState $state, |
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| 460 | Certificate $cert) { |
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| 461 | 40 | if (!$cert->isSelfIssued()) { |
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| 462 | 21 | if ($state->maxPathLength() <= 0) { |
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| 463 | 2 | throw new PathValidationException( |
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| 464 | 2 | "Certification path length exceeded."); |
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| 465 | } |
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| 466 | 19 | $state = $state->withMaxPathLength($state->maxPathLength() - 1); |
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| 467 | 19 | } |
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| 468 | 40 | return $state; |
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| 469 | } |
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| 470 | |||
| 471 | /** |
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| 472 | * Check key usage extension for the preparation step. |
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| 473 | * |
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| 474 | * @param Certificate $cert |
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| 475 | * @throws PathValidationException |
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| 476 | */ |
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| 477 | 40 | private function _checkKeyUsage(Certificate $cert) { |
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| 478 | 40 | $extensions = $cert->tbsCertificate()->extensions(); |
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| 479 | 40 | if ($extensions->hasKeyUsage()) { |
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| 480 | 20 | $ext = $extensions->keyUsage(); |
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| 481 | 20 | if (!$ext->isKeyCertSign()) { |
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| 482 | 1 | throw new PathValidationException("keyCertSign usage not set."); |
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| 483 | } |
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| 484 | 19 | } |
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| 485 | 39 | } |
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| 486 | |||
| 487 | /** |
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| 488 | * |
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| 489 | * @param ValidatorState $state |
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| 490 | * @param Certificate $cert |
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| 491 | * @return ValidatorState |
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| 492 | */ |
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| 493 | 1 | private function _processNameConstraints(ValidatorState $state, |
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| 498 | |||
| 499 | /** |
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| 500 | * Process basic constraints extension. |
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| 501 | * |
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| 502 | * @param Certificate $cert |
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| 503 | * @throws PathValidationException |
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| 504 | */ |
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| 505 | 42 | private function _processBasicContraints(Certificate $cert) { |
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| 506 | 42 | if ($cert->tbsCertificate()->version() == TBSCertificate::VERSION_3) { |
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| 507 | 39 | $extensions = $cert->tbsCertificate()->extensions(); |
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| 508 | 39 | if (!$extensions->hasBasicConstraints()) { |
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| 509 | 1 | throw new PathValidationException( |
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| 510 | 1 | "v3 certificate must have basicConstraints extension."); |
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| 511 | } |
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| 512 | // verify that cA is set to TRUE |
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| 513 | 38 | if (!$extensions->basicConstraints()->isCA()) { |
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| 519 | |||
| 520 | /** |
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| 521 | * Process pathLenConstraint. |
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| 522 | * |
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| 523 | * @param ValidatorState $state |
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| 524 | * @param Certificate $cert |
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| 525 | * @return ValidatorState |
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| 526 | */ |
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| 527 | 40 | private function _processPathLengthContraint(ValidatorState $state, |
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| 540 | |||
| 541 | /** |
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| 542 | * |
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| 543 | * @param ValidatorState $state |
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| 544 | * @param Certificate $cert |
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| 545 | * @return ValidatorState |
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| 546 | */ |
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| 547 | 39 | private function _processExtensions(ValidatorState $state, Certificate $cert) { |
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| 551 | |||
| 552 | /** |
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| 553 | * |
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| 554 | * @param ValidatorState $state |
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| 555 | * @return ValidatorState |
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| 556 | */ |
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| 557 | 30 | private function _calculatePolicyIntersection(ValidatorState $state) { |
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| 576 | } |
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| 577 |
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PHP Analyzer performs a side-effects analysis of your code. A side-effect is basically anything that might be visible after the scope of the method is left.
Let’s take a look at an example:
If we look at the
getEmail()method, we can see that it has no side-effect. Whether you call this method or not, no future calls to other methods are affected by this. As such code as the following is useless:On the hand, if we look at the
setEmail(), this method _has_ side-effects. In the following case, we could not remove the method call: