24101703016

Committed 06 Apr 2026 10:36PM UTC coverage: 89.45% (-0.005%) from 89.455%

Build # 24101703016

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Commit Message

Merge pull request #5521 from randombit/jack/fix-rollup

Rollup of small fixes

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85.71

/src/lib/x509/ocsp.cpp

/*
* OCSP
* (C) 2012,2013 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/ocsp.h>

#include <botan/base64.h>
#include <botan/ber_dec.h>
#include <botan/certstor.h>
#include <botan/der_enc.h>
#include <botan/hash.h>
#include <botan/pubkey.h>
#include <botan/x509_ext.h>

#if defined(BOTAN_HAS_HTTP_UTIL)
   #include <botan/internal/http_util.h>
#endif

namespace Botan::OCSP {

CertID::CertID(const X509_Certificate& issuer, const BigInt& subject_serial) : m_subject_serial(subject_serial) {
   /*
   In practice it seems some responders, including, notably,
   ocsp.verisign.com, will reject anything but SHA-1 here
   */
   auto hash = HashFunction::create_or_throw("SHA-1");

   m_hash_id = AlgorithmIdentifier(hash->name(), AlgorithmIdentifier::USE_NULL_PARAM);
   m_issuer_key_hash = unlock(hash->process(issuer.subject_public_key_bitstring()));
   m_issuer_dn_hash = unlock(hash->process(issuer.raw_subject_dn()));
}

bool CertID::is_id_for(const X509_Certificate& issuer, const X509_Certificate& subject) const {
   try {
      if(BigInt::from_bytes(subject.serial_number()) != m_subject_serial) {
         return false;
      }

      const std::string hash_algo = m_hash_id.oid().to_formatted_string();

      if(hash_algo != "SHA-1" && hash_algo != "SHA-256") {
         return false;
      }

      auto hash = HashFunction::create_or_throw(hash_algo);

      if(m_issuer_dn_hash != unlock(hash->process(subject.raw_issuer_dn()))) {
         return false;
      }

      if(m_issuer_key_hash != unlock(hash->process(issuer.subject_public_key_bitstring()))) {
         return false;
      }
   } catch(...) {
      return false;
   }

   return true;
}

void CertID::encode_into(DER_Encoder& to) const {
   to.start_sequence()
      .encode(m_hash_id)
      .encode(m_issuer_dn_hash, ASN1_Type::OctetString)
      .encode(m_issuer_key_hash, ASN1_Type::OctetString)
      .encode(m_subject_serial)
      .end_cons();
}

void CertID::decode_from(BER_Decoder& from) {
   /*
   * RFC 6960 Section 4.1.1
   *
   * CertID ::= SEQUENCE {
   *    hashAlgorithm       AlgorithmIdentifier,
   *    issuerNameHash      OCTET STRING,
   *    issuerKeyHash       OCTET STRING,
   *    serialNumber        CertificateSerialNumber }
   */
   from.start_sequence()
      .decode(m_hash_id)
      .decode(m_issuer_dn_hash, ASN1_Type::OctetString)
      .decode(m_issuer_key_hash, ASN1_Type::OctetString)
      .decode(m_subject_serial)
      .end_cons();
}

void SingleResponse::encode_into(DER_Encoder& /*to*/) const {
   throw Not_Implemented("SingleResponse::encode_into");
}

void SingleResponse::decode_from(BER_Decoder& from) {
   /*
   * RFC 6960 Section 4.2.1
   *
   * SingleResponse ::= SEQUENCE {
   *    certID                       CertID,
   *    certStatus                   CertStatus,
   *    thisUpdate                   GeneralizedTime,
   *    nextUpdate         [0]       EXPLICIT GeneralizedTime OPTIONAL,
   *    singleExtensions   [1]       EXPLICIT Extensions OPTIONAL }
   *
   * CertStatus ::= CHOICE {
   *    good        [0]     IMPLICIT NULL,
   *    revoked     [1]     IMPLICIT RevokedInfo,
   *    unknown     [2]     IMPLICIT UnknownInfo }
   *
   * RevokedInfo ::= SEQUENCE {
   *    revocationTime              GeneralizedTime,
   *    revocationReason    [0]     EXPLICIT CRLReason OPTIONAL }
   */
   BER_Object cert_status;
   Extensions extensions;

   from.start_sequence()
      .decode(m_certid)
      .get_next(cert_status)
      .decode(m_thisupdate)
      .decode_optional(m_nextupdate, ASN1_Type(0), ASN1_Class::ContextSpecific | ASN1_Class::Constructed)
      .decode_optional(extensions, ASN1_Type(1), ASN1_Class::ContextSpecific | ASN1_Class::Constructed)
      .end_cons();

   // TODO: should verify the cert_status body and decode RevokedInfo
   m_cert_status = static_cast<uint32_t>(cert_status.type());
}

namespace {

// TODO: should this be in a header somewhere?
void decode_optional_list(BER_Decoder& ber, ASN1_Type tag, std::vector<X509_Certificate>& output) {
   const BER_Object obj = ber.get_next_object();

   if(!obj.is_a(tag, ASN1_Class::ContextSpecific | ASN1_Class::Constructed)) {
      ber.push_back(obj);
      return;
   }

   BER_Decoder list(obj, BER_Decoder::Limits::DER());
   auto seq = list.start_sequence();
   while(seq.more_items()) {
      output.push_back([&] {
         X509_Certificate cert;
         cert.decode_from(seq);
         return cert;
      }());
   }
   seq.end_cons();
}

}  // namespace

Request::Request(const X509_Certificate& issuer_cert, const X509_Certificate& subject_cert) :
      m_issuer(issuer_cert), m_certid(m_issuer, BigInt::from_bytes(subject_cert.serial_number())) {
   if(subject_cert.issuer_dn() != issuer_cert.subject_dn()) {
      throw Invalid_Argument("Invalid cert pair to OCSP::Request (mismatched issuer,subject args?)");
   }
}

Request::Request(const X509_Certificate& issuer_cert, const BigInt& subject_serial) :
      m_issuer(issuer_cert), m_certid(m_issuer, subject_serial) {}

std::vector<uint8_t> Request::BER_encode() const {
   /*
   * RFC 6960 Section 4.1.1
   *
   * OCSPRequest ::= SEQUENCE {
   *    tbsRequest                  TBSRequest,
   *    optionalSignature   [0]    EXPLICIT Signature OPTIONAL }
   *
   * TBSRequest ::= SEQUENCE {
   *    version             [0]    EXPLICIT Version DEFAULT v1,
   *    requestList                SEQUENCE OF Request }
   *
   * Request ::= SEQUENCE {
   *    reqCert                    CertID }
   */
   std::vector<uint8_t> output;
   DER_Encoder(output)
      .start_sequence()
      .start_sequence()
      .start_explicit(0)
      .encode(static_cast<size_t>(0))  // version #
      .end_explicit()
      .start_sequence()
      .start_sequence()
      .encode(m_certid)
      .end_cons()
      .end_cons()
      .end_cons()
      .end_cons();

   return output;
}

std::string Request::base64_encode() const {
   return Botan::base64_encode(BER_encode());
}

Response::Response(Certificate_Status_Code status) :
      m_status(Response_Status_Code::Successful), m_dummy_response_status(status) {}

Response::Response(const uint8_t response_bits[], size_t response_bits_len) :
      m_response_bits(response_bits, response_bits + response_bits_len) {
   /*
   * RFC 6960 Section 4.2.1
   *
   * OCSPResponse ::= SEQUENCE {
   *    responseStatus         OCSPResponseStatus,
   *    responseBytes      [0] EXPLICIT ResponseBytes OPTIONAL }
   *
   * OCSPResponseStatus ::= ENUMERATED { ... }
   *
   * ResponseBytes ::= SEQUENCE {
   *    responseType   OBJECT IDENTIFIER,
   *    response       OCTET STRING }
   */
   BER_Decoder outer_decoder(m_response_bits, BER_Decoder::Limits::DER());
   BER_Decoder response_outer = outer_decoder.start_sequence();

   size_t resp_status = 0;

   response_outer.decode(resp_status, ASN1_Type::Enumerated, ASN1_Class::Universal);

   m_status = static_cast<Response_Status_Code>(resp_status);

   if(m_status != Response_Status_Code::Successful) {
      return;
   }

   if(response_outer.more_items()) {
      BER_Decoder response_bytes_ctx = response_outer.start_context_specific(0);
      BER_Decoder response_bytes = response_bytes_ctx.start_sequence();

      response_bytes.decode_and_check(OID({1, 3, 6, 1, 5, 5, 7, 48, 1, 1}), "Unknown response type in OCSP response");

      /*
      * RFC 6960 Section 4.2.1
      *
      * BasicOCSPResponse ::= SEQUENCE {
      *    tbsResponseData      ResponseData,
      *    signatureAlgorithm   AlgorithmIdentifier,
      *    signature            BIT STRING,
      *    certs            [0] EXPLICIT SEQUENCE OF Certificate OPTIONAL }
      */
      BER_Decoder basic_response_decoder(response_bytes.get_next_octet_string(), BER_Decoder::Limits::DER());
      BER_Decoder basicresponse = basic_response_decoder.start_sequence();

      basicresponse.start_sequence()
         .raw_bytes(m_tbs_bits)
         .end_cons()
         .decode(m_sig_algo)
         .decode(m_signature, ASN1_Type::BitString);
      decode_optional_list(basicresponse, ASN1_Type(0), m_certs);

      basicresponse.verify_end();
      basic_response_decoder.verify_end();

      /*
      * RFC 6960 Section 4.2.1
      *
      * ResponseData ::= SEQUENCE {
      *    version              [0] EXPLICIT Version DEFAULT v1,
      *    responderID              ResponderID,
      *    producedAt               GeneralizedTime,
      *    responses                SEQUENCE OF SingleResponse,
      *    responseExtensions   [1] EXPLICIT Extensions OPTIONAL }
      *
      * ResponderID ::= CHOICE {
      *    byName   [1] Name,
      *    byKey    [2] KeyHash }
      */
      size_t responsedata_version = 0;
      Extensions extensions;

      BER_Decoder(m_tbs_bits, BER_Decoder::Limits::DER())
         .decode_optional(responsedata_version, ASN1_Type(0), ASN1_Class::ContextSpecific | ASN1_Class::Constructed)

         .decode_optional(m_signer_name, ASN1_Type(1), ASN1_Class::ContextSpecific | ASN1_Class::Constructed)

         .decode_optional_string(
            m_key_hash, ASN1_Type::OctetString, 2, ASN1_Class::ContextSpecific | ASN1_Class::Constructed)

         .decode(m_produced_at)

         .decode_list(m_responses)

         .decode_optional(extensions, ASN1_Type(1), ASN1_Class::ContextSpecific | ASN1_Class::Constructed)

         .verify_end();

      const bool has_signer = !m_signer_name.empty();
      const bool has_key_hash = !m_key_hash.empty();

      if(has_signer && has_key_hash) {
         throw Decoding_Error("OCSP response includes both byName and byKey in responderID field");
      }
      if(!has_signer && !has_key_hash) {
         throw Decoding_Error("OCSP response contains neither byName nor byKey in responderID field");
      }

      response_bytes.verify_end();
      response_bytes_ctx.verify_end();
   }

   response_outer.verify_end();
   outer_decoder.verify_end();
}

bool Response::is_issued_by(const X509_Certificate& candidate) const {
   if(!m_signer_name.empty()) {
      return (candidate.subject_dn() == m_signer_name);
   }

   if(!m_key_hash.empty()) {
      return (candidate.subject_public_key_bitstring_sha1() == m_key_hash);
   }

   return false;
}

Certificate_Status_Code Response::verify_signature(const X509_Certificate& issuer) const {
   if(m_dummy_response_status) {
      return m_dummy_response_status.value();
   }

   if(m_signer_name.empty() && m_key_hash.empty()) {
      return Certificate_Status_Code::OCSP_RESPONSE_INVALID;
   }

   if(!is_issued_by(issuer)) {
      return Certificate_Status_Code::OCSP_ISSUER_NOT_FOUND;
   }

   try {
      auto pub_key = issuer.subject_public_key();

      PK_Verifier verifier(*pub_key, m_sig_algo);

      if(verifier.verify_message(ASN1::put_in_sequence(m_tbs_bits), m_signature)) {
         return Certificate_Status_Code::OCSP_SIGNATURE_OK;
      } else {
         return Certificate_Status_Code::OCSP_SIGNATURE_ERROR;
      }
   } catch(Exception&) {
      return Certificate_Status_Code::OCSP_SIGNATURE_ERROR;
   }
}

std::optional<X509_Certificate> Response::find_signing_certificate(
   const X509_Certificate& issuer_certificate, const Certificate_Store* trusted_ocsp_responders) const {
   using namespace std::placeholders;

   // Check whether the CA issuing the certificate in question also signed this
   if(is_issued_by(issuer_certificate)) {
      return issuer_certificate;
   }

   // Then try to find a delegated responder certificate in the stapled certs
   for(const auto& cert : m_certs) {
      if(this->is_issued_by(cert)) {
         return cert;
      }
   }

   // Last resort: check the additionally provides trusted OCSP responders
   if(trusted_ocsp_responders != nullptr) {
      if(!m_key_hash.empty()) {
         auto signing_cert = trusted_ocsp_responders->find_cert_by_pubkey_sha1(m_key_hash);
         if(signing_cert) {
            return signing_cert;
         }
      }

      if(!m_signer_name.empty()) {
         auto signing_cert = trusted_ocsp_responders->find_cert(m_signer_name, {});
         if(signing_cert) {
            return signing_cert;
         }
      }
   }

   return std::nullopt;
}

Certificate_Status_Code Response::status_for(const X509_Certificate& issuer,
                                             const X509_Certificate& subject,
                                             std::chrono::system_clock::time_point ref_time,
                                             std::chrono::seconds max_age) const {
   if(m_dummy_response_status) {
      return m_dummy_response_status.value();
   }

   for(const auto& response : m_responses) {
      if(response.certid().is_id_for(issuer, subject)) {
         const X509_Time x509_ref_time(ref_time);

         if(response.cert_status() == 1) {
            return Certificate_Status_Code::CERT_IS_REVOKED;
         }

         if(response.this_update() > x509_ref_time) {
            return Certificate_Status_Code::OCSP_NOT_YET_VALID;
         }

         if(response.next_update().time_is_set()) {
            if(x509_ref_time > response.next_update()) {
               return Certificate_Status_Code::OCSP_HAS_EXPIRED;
            }
         } else if(max_age > std::chrono::seconds::zero() &&
                   ref_time - response.this_update().to_std_timepoint() > max_age) {
            return Certificate_Status_Code::OCSP_IS_TOO_OLD;
         }

         if(response.cert_status() == 0) {
            return Certificate_Status_Code::OCSP_RESPONSE_GOOD;
         } else {
            return Certificate_Status_Code::OCSP_BAD_STATUS;
         }
      }
   }

   return Certificate_Status_Code::OCSP_CERT_NOT_LISTED;
}

#if defined(BOTAN_HAS_HTTP_UTIL)

Response online_check(const X509_Certificate& issuer,
                      const BigInt& subject_serial,
                      std::string_view ocsp_responder,
                      std::chrono::milliseconds timeout) {
   if(ocsp_responder.empty()) {
      throw Invalid_Argument("No OCSP responder specified");
   }

   const OCSP::Request req(issuer, subject_serial);

   auto http = HTTP::POST_sync(ocsp_responder, "application/ocsp-request", req.BER_encode(), 1, timeout);

   http.throw_unless_ok();

   // Check the MIME type?

   return OCSP::Response(http.body());
}

Response online_check(const X509_Certificate& issuer,
                      const X509_Certificate& subject,
                      std::chrono::milliseconds timeout) {
   if(subject.issuer_dn() != issuer.subject_dn()) {
      throw Invalid_Argument("Invalid cert pair to OCSP::online_check (mismatched issuer,subject args?)");
   }

   return online_check(issuer, BigInt::from_bytes(subject.serial_number()), subject.ocsp_responder(), timeout);
}

#endif

}  // namespace Botan::OCSP

1	/*
2	* OCSP
3	* (C) 2012,2013 Jack Lloyd
4	*
5	* Botan is released under the Simplified BSD License (see license.txt)
6	*/
7
8	#include <botan/ocsp.h>
9
10	#include <botan/base64.h>
11	#include <botan/ber_dec.h>
12	#include <botan/certstor.h>
13	#include <botan/der_enc.h>
14	#include <botan/hash.h>
15	#include <botan/pubkey.h>
16	#include <botan/x509_ext.h>
17
18	#if defined(BOTAN_HAS_HTTP_UTIL)
19	#include <botan/internal/http_util.h>
20	#endif
21
22	namespace Botan::OCSP {
23
24	CertID::CertID(const X509_Certificate& issuer, const BigInt& subject_serial) : m_subject_serial(subject_serial) {	4✔
25	/*
26	In practice it seems some responders, including, notably,
27	ocsp.verisign.com, will reject anything but SHA-1 here
28	*/
29	auto hash = HashFunction::create_or_throw("SHA-1");	4✔
30
31	m_hash_id = AlgorithmIdentifier(hash->name(), AlgorithmIdentifier::USE_NULL_PARAM);	4✔
32	m_issuer_key_hash = unlock(hash->process(issuer.subject_public_key_bitstring()));	8✔
33	m_issuer_dn_hash = unlock(hash->process(issuer.raw_subject_dn()));	12✔
34	}	4✔
35
36	bool CertID::is_id_for(const X509_Certificate& issuer, const X509_Certificate& subject) const {	38✔
37	try {	38✔
38	if(BigInt::from_bytes(subject.serial_number()) != m_subject_serial) {	76✔
39	return false;	×
40	}
41
42	const std::string hash_algo = m_hash_id.oid().to_formatted_string();	38✔
43
44	if(hash_algo != "SHA-1" && hash_algo != "SHA-256") {	38✔
45	return false;
46	}
47
48	auto hash = HashFunction::create_or_throw(hash_algo);	38✔
49
50	if(m_issuer_dn_hash != unlock(hash->process(subject.raw_issuer_dn()))) {	152✔
51	return false;
52	}
53
54	if(m_issuer_key_hash != unlock(hash->process(issuer.subject_public_key_bitstring()))) {	152✔
55	return false;
56	}
57	} catch(...) {	38✔
58	return false;	×
59	}	×
60
61	return true;	38✔
62	}
63
64	void CertID::encode_into(DER_Encoder& to) const {	3✔
65	to.start_sequence()	3✔
66	.encode(m_hash_id)	3✔
67	.encode(m_issuer_dn_hash, ASN1_Type::OctetString)	3✔
68	.encode(m_issuer_key_hash, ASN1_Type::OctetString)	3✔
69	.encode(m_subject_serial)	3✔
70	.end_cons();	3✔
71	}	3✔
72
73	void CertID::decode_from(BER_Decoder& from) {	48✔
74	/*
75	* RFC 6960 Section 4.1.1
76	*
77	* CertID ::= SEQUENCE {
78	* hashAlgorithm AlgorithmIdentifier,
79	* issuerNameHash OCTET STRING,
80	* issuerKeyHash OCTET STRING,
81	* serialNumber CertificateSerialNumber }
82	*/
83	from.start_sequence()	96✔
84	.decode(m_hash_id)	48✔
85	.decode(m_issuer_dn_hash, ASN1_Type::OctetString)	48✔
86	.decode(m_issuer_key_hash, ASN1_Type::OctetString)	48✔
87	.decode(m_subject_serial)	48✔
88	.end_cons();	46✔
89	}	46✔
90
91	void SingleResponse::encode_into(DER_Encoder& /to/) const {	×
92	throw Not_Implemented("SingleResponse::encode_into");	×
93	}
94
95	void SingleResponse::decode_from(BER_Decoder& from) {	48✔
96	/*
97	* RFC 6960 Section 4.2.1
98	*
99	* SingleResponse ::= SEQUENCE {
100	* certID CertID,
101	* certStatus CertStatus,
102	* thisUpdate GeneralizedTime,
103	* nextUpdate [0] EXPLICIT GeneralizedTime OPTIONAL,
104	* singleExtensions [1] EXPLICIT Extensions OPTIONAL }
105	*
106	* CertStatus ::= CHOICE {
107	* good [0] IMPLICIT NULL,
108	* revoked [1] IMPLICIT RevokedInfo,
109	* unknown [2] IMPLICIT UnknownInfo }
110	*
111	* RevokedInfo ::= SEQUENCE {
112	* revocationTime GeneralizedTime,
113	* revocationReason [0] EXPLICIT CRLReason OPTIONAL }
114	*/
115	BER_Object cert_status;	48✔
116	Extensions extensions;	48✔
117
118	from.start_sequence()	56✔
119	.decode(m_certid)	48✔
120	.get_next(cert_status)	46✔
121	.decode(m_thisupdate)	46✔
122	.decode_optional(m_nextupdate, ASN1_Type(0), ASN1_Class::ContextSpecific \| ASN1_Class::Constructed)	83✔
123	.decode_optional(extensions, ASN1_Type(1), ASN1_Class::ContextSpecific \| ASN1_Class::Constructed)	90✔
124	.end_cons();	40✔
125
126	// TODO: should verify the cert_status body and decode RevokedInfo
127	m_cert_status = static_cast<uint32_t>(cert_status.type());	40✔
128	}	48✔
129
130	namespace {
131
132	// TODO: should this be in a header somewhere?
133	void decode_optional_list(BER_Decoder& ber, ASN1_Type tag, std::vector<X509_Certificate>& output) {	990✔
134	const BER_Object obj = ber.get_next_object();	990✔
135
136	if(!obj.is_a(tag, ASN1_Class::ContextSpecific \| ASN1_Class::Constructed)) {	990✔
137	ber.push_back(obj);	24✔
138	return;	24✔
139	}
140
141	BER_Decoder list(obj, BER_Decoder::Limits::DER());	966✔
142	auto seq = list.start_sequence();	966✔
143	while(seq.more_items()) {	981✔
144	output.push_back([&] {	2,871✔
145	X509_Certificate cert;	941✔
146	cert.decode_from(seq);	941✔
147	return cert;	48✔
148	}());	1,882✔
149	}
150	seq.end_cons();	40✔
151	}	2,809✔
152
153	} // namespace
154
155	Request::Request(const X509_Certificate& issuer_cert, const X509_Certificate& subject_cert) :	2✔
156	m_issuer(issuer_cert), m_certid(m_issuer, BigInt::from_bytes(subject_cert.serial_number())) {	2✔
157	if(subject_cert.issuer_dn() != issuer_cert.subject_dn()) {	2✔
158	throw Invalid_Argument("Invalid cert pair to OCSP::Request (mismatched issuer,subject args?)");	1✔
159	}
160	}	3✔
161
162	Request::Request(const X509_Certificate& issuer_cert, const BigInt& subject_serial) :	2✔
163	m_issuer(issuer_cert), m_certid(m_issuer, subject_serial) {}	2✔
164
165	std::vector<uint8_t> Request::BER_encode() const {	3✔
166	/*
167	* RFC 6960 Section 4.1.1
168	*
169	* OCSPRequest ::= SEQUENCE {
170	* tbsRequest TBSRequest,
171	* optionalSignature [0] EXPLICIT Signature OPTIONAL }
172	*
173	* TBSRequest ::= SEQUENCE {
174	* version [0] EXPLICIT Version DEFAULT v1,
175	* requestList SEQUENCE OF Request }
176	*
177	* Request ::= SEQUENCE {
178	* reqCert CertID }
179	*/
180	std::vector<uint8_t> output;	3✔
181	DER_Encoder(output)	6✔
182	.start_sequence()	3✔
183	.start_sequence()	3✔
184	.start_explicit(0)	3✔
185	.encode(static_cast<size_t>(0)) // version #	3✔
186	.end_explicit()	3✔
187	.start_sequence()	3✔
188	.start_sequence()	3✔
189	.encode(m_certid)	3✔
190	.end_cons()	3✔
191	.end_cons()	3✔
192	.end_cons()	3✔
193	.end_cons();	3✔
194
195	return output;	3✔
196	}	×
197
198	std::string Request::base64_encode() const {	2✔
199	return Botan::base64_encode(BER_encode());	4✔
200	}
201
202	Response::Response(Certificate_Status_Code status) :	11✔
203	m_status(Response_Status_Code::Successful), m_dummy_response_status(status) {}	11✔
204
205	Response::Response(const uint8_t response_bits[], size_t response_bits_len) :	2,905✔
206	m_response_bits(response_bits, response_bits + response_bits_len) {	2,905✔
207	/*
208	* RFC 6960 Section 4.2.1
209	*
210	* OCSPResponse ::= SEQUENCE {
211	* responseStatus OCSPResponseStatus,
212	* responseBytes [0] EXPLICIT ResponseBytes OPTIONAL }
213	*
214	* OCSPResponseStatus ::= ENUMERATED { ... }
215	*
216	* ResponseBytes ::= SEQUENCE {
217	* responseType OBJECT IDENTIFIER,
218	* response OCTET STRING }
219	*/
220	BER_Decoder outer_decoder(m_response_bits, BER_Decoder::Limits::DER());	2,905✔
221	BER_Decoder response_outer = outer_decoder.start_sequence();	2,905✔
222
223	size_t resp_status = 0;	1,004✔
224
225	response_outer.decode(resp_status, ASN1_Type::Enumerated, ASN1_Class::Universal);	1,004✔
226
227	m_status = static_cast<Response_Status_Code>(resp_status);	993✔
228
229	if(m_status != Response_Status_Code::Successful) {	993✔
230	return;	1✔
231	}
232
233	if(response_outer.more_items()) {	992✔
234	BER_Decoder response_bytes_ctx = response_outer.start_context_specific(0);	992✔
235	BER_Decoder response_bytes = response_bytes_ctx.start_sequence();	992✔
236
237	response_bytes.decode_and_check(OID({1, 3, 6, 1, 5, 5, 7, 48, 1, 1}), "Unknown response type in OCSP response");	992✔
238
239	/*
240	* RFC 6960 Section 4.2.1
241	*
242	* BasicOCSPResponse ::= SEQUENCE {
243	* tbsResponseData ResponseData,
244	* signatureAlgorithm AlgorithmIdentifier,
245	* signature BIT STRING,
246	* certs [0] EXPLICIT SEQUENCE OF Certificate OPTIONAL }
247	*/
248	BER_Decoder basic_response_decoder(response_bytes.get_next_octet_string(), BER_Decoder::Limits::DER());	992✔
249	BER_Decoder basicresponse = basic_response_decoder.start_sequence();	992✔
250
251	basicresponse.start_sequence()	992✔
252	.raw_bytes(m_tbs_bits)	990✔
253	.end_cons()	990✔
254	.decode(m_sig_algo)	990✔
255	.decode(m_signature, ASN1_Type::BitString);	990✔
256	decode_optional_list(basicresponse, ASN1_Type(0), m_certs);	990✔
257
258	basicresponse.verify_end();	64✔
259	basic_response_decoder.verify_end();	63✔
260
261	/*
262	* RFC 6960 Section 4.2.1
263	*
264	* ResponseData ::= SEQUENCE {
265	* version [0] EXPLICIT Version DEFAULT v1,
266	* responderID ResponderID,
267	* producedAt GeneralizedTime,
268	* responses SEQUENCE OF SingleResponse,
269	* responseExtensions [1] EXPLICIT Extensions OPTIONAL }
270	*
271	* ResponderID ::= CHOICE {
272	* byName [1] Name,
273	* byKey [2] KeyHash }
274	*/
275	size_t responsedata_version = 0;	63✔
276	Extensions extensions;	63✔
277
278	BER_Decoder(m_tbs_bits, BER_Decoder::Limits::DER())	86✔
279	.decode_optional(responsedata_version, ASN1_Type(0), ASN1_Class::ContextSpecific \| ASN1_Class::Constructed)	63✔
280
281	.decode_optional(m_signer_name, ASN1_Type(1), ASN1_Class::ContextSpecific \| ASN1_Class::Constructed)	122✔
282
283	.decode_optional_string(	59✔
284	m_key_hash, ASN1_Type::OctetString, 2, ASN1_Class::ContextSpecific \| ASN1_Class::Constructed)	59✔
285
286	.decode(m_produced_at)	59✔
287
288	.decode_list(m_responses)	48✔
289
290	.decode_optional(extensions, ASN1_Type(1), ASN1_Class::ContextSpecific \| ASN1_Class::Constructed)	99✔
291
292	.verify_end();	40✔
293
294	const bool has_signer = !m_signer_name.empty();	40✔
295	const bool has_key_hash = !m_key_hash.empty();	40✔
296
297	if(has_signer && has_key_hash) {	40✔
298	throw Decoding_Error("OCSP response includes both byName and byKey in responderID field");	×
299	}
300	if(!has_signer && !has_key_hash) {	40✔
301	throw Decoding_Error("OCSP response contains neither byName nor byKey in responderID field");	×
302	}
303
304	response_bytes.verify_end();	40✔
305	response_bytes_ctx.verify_end();	40✔
306	}	3,848✔
307
308	response_outer.verify_end();	40✔
309	outer_decoder.verify_end();	40✔
310	}	20,098✔
311
312	bool Response::is_issued_by(const X509_Certificate& candidate) const {	117✔
313	if(!m_signer_name.empty()) {	117✔
314	return (candidate.subject_dn() == m_signer_name);	114✔
315	}
316
317	if(!m_key_hash.empty()) {	3✔
318	return (candidate.subject_public_key_bitstring_sha1() == m_key_hash);	2✔
319	}
320
321	return false;
322	}
323
324	Certificate_Status_Code Response::verify_signature(const X509_Certificate& issuer) const {	40✔
325	if(m_dummy_response_status) {	40✔
326	return m_dummy_response_status.value();	×
327	}
328
329	if(m_signer_name.empty() && m_key_hash.empty()) {	40✔
330	return Certificate_Status_Code::OCSP_RESPONSE_INVALID;
331	}
332
333	if(!is_issued_by(issuer)) {	40✔
334	return Certificate_Status_Code::OCSP_ISSUER_NOT_FOUND;
335	}
336
337	try {	40✔
338	auto pub_key = issuer.subject_public_key();	40✔
339
340	PK_Verifier verifier(*pub_key, m_sig_algo);	40✔
341
342	if(verifier.verify_message(ASN1::put_in_sequence(m_tbs_bits), m_signature)) {	80✔
343	return Certificate_Status_Code::OCSP_SIGNATURE_OK;
344	} else {
345	return Certificate_Status_Code::OCSP_SIGNATURE_ERROR;	1✔
346	}
347	} catch(Exception&) {	80✔
348	return Certificate_Status_Code::OCSP_SIGNATURE_ERROR;	×
349	}	×
350	}
351
352	std::optional<X509_Certificate> Response::find_signing_certificate(	53✔
353	const X509_Certificate& issuer_certificate, const Certificate_Store* trusted_ocsp_responders) const {
354	using namespace std::placeholders;	53✔
355
356	// Check whether the CA issuing the certificate in question also signed this
357	if(is_issued_by(issuer_certificate)) {	53✔
358	return issuer_certificate;	21✔
359	}
360
361	// Then try to find a delegated responder certificate in the stapled certs
362	for(const auto& cert : m_certs) {	32✔
363	if(this->is_issued_by(cert)) {	24✔
364	return cert;	24✔
365	}
366	}
367
368	// Last resort: check the additionally provides trusted OCSP responders
369	if(trusted_ocsp_responders != nullptr) {	8✔
370	if(!m_key_hash.empty()) {	4✔
371	auto signing_cert = trusted_ocsp_responders->find_cert_by_pubkey_sha1(m_key_hash);	×
372	if(signing_cert) {	×
373	return signing_cert;	×
374	}
375	}	×
376
377	if(!m_signer_name.empty()) {	4✔
378	auto signing_cert = trusted_ocsp_responders->find_cert(m_signer_name, {});	4✔
379	if(signing_cert) {	4✔
380	return signing_cert;	2✔
381	}
382	}	4✔
383	}
384
385	return std::nullopt;	6✔
386	}
387
388	Certificate_Status_Code Response::status_for(const X509_Certificate& issuer,	38✔
389	const X509_Certificate& subject,
390	std::chrono::system_clock::time_point ref_time,
391	std::chrono::seconds max_age) const {
392	if(m_dummy_response_status) {	38✔
393	return m_dummy_response_status.value();	×
394	}
395
396	for(const auto& response : m_responses) {	38✔
397	if(response.certid().is_id_for(issuer, subject)) {	38✔
398	const X509_Time x509_ref_time(ref_time);	38✔
399
400	if(response.cert_status() == 1) {	38✔
401	return Certificate_Status_Code::CERT_IS_REVOKED;
402	}
403
404	if(response.this_update() > x509_ref_time) {	38✔
405	return Certificate_Status_Code::OCSP_NOT_YET_VALID;
406	}
407
408	if(response.next_update().time_is_set()) {	28✔
409	if(x509_ref_time > response.next_update()) {	20✔
410	return Certificate_Status_Code::OCSP_HAS_EXPIRED;
411	}
412	} else if(max_age > std::chrono::seconds::zero() &&	12✔
413	ref_time - response.this_update().to_std_timepoint() > max_age) {	8✔
414	return Certificate_Status_Code::OCSP_IS_TOO_OLD;	2✔
415	}
416
417	if(response.cert_status() == 0) {	20✔
418	return Certificate_Status_Code::OCSP_RESPONSE_GOOD;
419	} else {
420	return Certificate_Status_Code::OCSP_BAD_STATUS;	×
421	}
422	}	38✔
423	}
424
425	return Certificate_Status_Code::OCSP_CERT_NOT_LISTED;
426	}
427
428	#if defined(BOTAN_HAS_HTTP_UTIL)
429
430	Response online_check(const X509_Certificate& issuer,	×
431	const BigInt& subject_serial,
432	std::string_view ocsp_responder,
433	std::chrono::milliseconds timeout) {
434	if(ocsp_responder.empty()) {	×
435	throw Invalid_Argument("No OCSP responder specified");	×
436	}
437
438	const OCSP::Request req(issuer, subject_serial);	×
439
440	auto http = HTTP::POST_sync(ocsp_responder, "application/ocsp-request", req.BER_encode(), 1, timeout);	×
441
442	http.throw_unless_ok();	×
443
444	// Check the MIME type?
445
446	return OCSP::Response(http.body());	×
447	}	×
448
449	Response online_check(const X509_Certificate& issuer,	×
450	const X509_Certificate& subject,
451	std::chrono::milliseconds timeout) {
452	if(subject.issuer_dn() != issuer.subject_dn()) {	×
453	throw Invalid_Argument("Invalid cert pair to OCSP::online_check (mismatched issuer,subject args?)");	×
454	}
455
456	return online_check(issuer, BigInt::from_bytes(subject.serial_number()), subject.ocsp_responder(), timeout);	×
457	}
458
459	#endif
460
461	} // namespace Botan::OCSP

randombit / botan / 24101703016

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