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-rw-r--r--src/lib/cert/x509/x509_ext.cpp75
-rw-r--r--src/lib/cert/x509/x509_ext.h69
-rw-r--r--src/lib/cert/x509/x509path.cpp68
3 files changed, 111 insertions, 101 deletions
diff --git a/src/lib/cert/x509/x509_ext.cpp b/src/lib/cert/x509/x509_ext.cpp
index 7dd6100ee..b54c82b87 100644
--- a/src/lib/cert/x509/x509_ext.cpp
+++ b/src/lib/cert/x509/x509_ext.cpp
@@ -6,6 +6,7 @@
*/
#include <botan/x509_ext.h>
+#include <botan/x509cert.h>
#include <botan/sha160.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
@@ -40,7 +41,7 @@ Certificate_Extension* Extensions::get_extension(const OID& oid, bool critical)
X509_EXTENSION("X509v3.CRLNumber", CRL_Number);
X509_EXTENSION("X509v3.ReasonCode", CRL_ReasonCode);
- return critical ? new Cert_Extension::Unknown_Critical_Extension() : nullptr;
+ return critical ? new Cert_Extension::Unknown_Critical_Extension(oid) : nullptr;
}
/*
@@ -77,6 +78,16 @@ OID Certificate_Extension::oid_of() const
return OIDS::lookup(oid_name());
}
+/*
+* Validate the extension (the default implementation is a NOP)
+*/
+void Certificate_Extension::validate(const X509_Certificate&, const X509_Certificate&,
+ const std::vector<X509_Certificate>&,
+ std::vector<std::set<Certificate_Status_Code>>&,
+ size_t)
+ {
+ }
+
void Extensions::add(Certificate_Extension* extn, bool critical)
{
m_extensions.push_back(std::make_pair(std::unique_ptr<Certificate_Extension>(extn), critical));
@@ -510,6 +521,68 @@ void Name_Constraints::contents_to(Data_Store& subject, Data_Store&) const
}
}
+void Name_Constraints::validate(const X509_Certificate& subject, const X509_Certificate& issuer,
+ const std::vector<X509_Certificate>& cert_path,
+ std::vector<std::set<Certificate_Status_Code>>& cert_status,
+ size_t pos)
+ {
+ if(!m_name_constraints.permitted().empty() || !m_name_constraints.excluded().empty())
+ {
+ if(!subject.is_CA_cert() || !subject.is_critical("X509v3.NameConstraints"))
+ cert_status.at(pos).insert(Certificate_Status_Code::NAME_CONSTRAINT_ERROR);
+
+ const bool at_self_signed_root = (pos == cert_path.size() - 1);
+
+ // Check that all subordinate certs pass the name constraint
+ for(size_t j = 0; j <= pos; ++j)
+ {
+ if(pos == j && at_self_signed_root)
+ continue;
+
+ bool permitted = m_name_constraints.permitted().empty();
+ bool failed = false;
+
+ for(auto c: m_name_constraints.permitted())
+ {
+ switch(c.base().matches(cert_path.at(j)))
+ {
+ case GeneralName::MatchResult::NotFound:
+ case GeneralName::MatchResult::All:
+ permitted = true;
+ break;
+ case GeneralName::MatchResult::UnknownType:
+ failed = issuer.is_critical("X509v3.NameConstraints");
+ permitted = true;
+ break;
+ default:
+ break;
+ }
+ }
+
+ for(auto c: m_name_constraints.excluded())
+ {
+ switch(c.base().matches(cert_path.at(j)))
+ {
+ case GeneralName::MatchResult::All:
+ case GeneralName::MatchResult::Some:
+ failed = true;
+ break;
+ case GeneralName::MatchResult::UnknownType:
+ failed = issuer.is_critical("X509v3.NameConstraints");
+ break;
+ default:
+ break;
+ }
+ }
+
+ if(failed || !permitted)
+ {
+ cert_status.at(j).insert(Certificate_Status_Code::NAME_CONSTRAINT_ERROR);
+ }
+ }
+ }
+ }
+
namespace {
/*
diff --git a/src/lib/cert/x509/x509_ext.h b/src/lib/cert/x509/x509_ext.h
index e1e8666ff..caefcb855 100644
--- a/src/lib/cert/x509/x509_ext.h
+++ b/src/lib/cert/x509/x509_ext.h
@@ -30,7 +30,7 @@ class BOTAN_DLL Certificate_Extension
/**
* @return OID representing this extension
*/
- OID oid_of() const;
+ virtual OID oid_of() const;
/**
* Make a copy of this extension
@@ -53,17 +53,24 @@ class BOTAN_DLL Certificate_Extension
virtual std::string oid_name() const = 0;
/*
- * Callback visited during path validation
+ * Callback visited during path validation.
+ *
+ * An extension can implement this callback to inspect
+ * the path during path validation.
*
* If an error occurs during validation of this extension,
- * an appropriate status code shall be added to status.
+ * an appropriate status code shall be added to cert_status.
*
- * @param current_cert Certificate that contains this extension
- * @param status Certificate validation status codes for current_cert
+ * @param subject Subject certificate that contains this extension
+ * @param issuer Issuer certificate
+ * @param status Certificate validation status codes for subject certificate
* @param cert_path Certificate path which is currently validated
+ * @param pos Position of subject certificate in cert_path
*/
- virtual void validate(const X509_Certificate& current_cert, std::set<Certificate_Status_Code>& status,
- const std::vector<X509_Certificate>& cert_path) = 0;
+ virtual void validate(const X509_Certificate& subject, const X509_Certificate& issuer,
+ const std::vector<X509_Certificate>& cert_path,
+ std::vector<std::set<Certificate_Status_Code>>& cert_status,
+ size_t pos);
virtual ~Certificate_Extension() {}
protected:
@@ -123,8 +130,6 @@ class BOTAN_DLL Basic_Constraints final : public Certificate_Extension
bool get_is_ca() const { return m_is_ca; }
size_t get_path_limit() const;
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& /* status */,
- const std::vector<X509_Certificate>& /* cert_path */) {}
private:
std::string oid_name() const override
{ return "X509v3.BasicConstraints"; }
@@ -149,8 +154,6 @@ class BOTAN_DLL Key_Usage final : public Certificate_Extension
Key_Constraints get_constraints() const { return m_constraints; }
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& /* status */,
- const std::vector<X509_Certificate>& /* cert_path */) {}
private:
std::string oid_name() const override { return "X509v3.KeyUsage"; }
@@ -176,9 +179,6 @@ class BOTAN_DLL Subject_Key_ID final : public Certificate_Extension
explicit Subject_Key_ID(const std::vector<byte>&);
std::vector<byte> get_key_id() const { return m_key_id; }
-
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& /* status */,
- const std::vector<X509_Certificate>& /* cert_path */) {}
private:
std::string oid_name() const override
{ return "X509v3.SubjectKeyIdentifier"; }
@@ -205,8 +205,6 @@ class BOTAN_DLL Authority_Key_ID final : public Certificate_Extension
std::vector<byte> get_key_id() const { return m_key_id; }
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& /* status */,
- const std::vector<X509_Certificate>& /* cert_path */) {}
private:
std::string oid_name() const override
{ return "X509v3.AuthorityKeyIdentifier"; }
@@ -232,8 +230,6 @@ class BOTAN_DLL Alternative_Name : public Certificate_Extension
Alternative_Name(const std::string&, const std::string&);
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& /* status */,
- const std::vector<X509_Certificate>& /* cert_path */) {}
private:
std::string oid_name() const override { return m_oid_name_str; }
@@ -284,8 +280,6 @@ class BOTAN_DLL Extended_Key_Usage final : public Certificate_Extension
std::vector<OID> get_oids() const { return m_oids; }
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& /* status */,
- const std::vector<X509_Certificate>& /* cert_path */) {}
private:
std::string oid_name() const override
{ return "X509v3.ExtendedKeyUsage"; }
@@ -310,8 +304,11 @@ class BOTAN_DLL Name_Constraints : public Certificate_Extension
Name_Constraints() {}
Name_Constraints(const NameConstraints &nc) : m_name_constraints(nc) {}
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& /* status */,
- const std::vector<X509_Certificate>& /* cert_path */) {}
+ void validate(const X509_Certificate& subject, const X509_Certificate& issuer,
+ const std::vector<X509_Certificate>& cert_path,
+ std::vector<std::set<Certificate_Status_Code>>& cert_status,
+ size_t pos) override;
+
private:
std::string oid_name() const override
{ return "X509v3.NameConstraints"; }
@@ -338,8 +335,6 @@ class BOTAN_DLL Certificate_Policies final : public Certificate_Extension
std::vector<OID> get_oids() const { return m_oids; }
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& /* status */,
- const std::vector<X509_Certificate>& /* cert_path */) {}
private:
std::string oid_name() const override
{ return "X509v3.CertificatePolicies"; }
@@ -363,8 +358,6 @@ class BOTAN_DLL Authority_Information_Access final : public Certificate_Extensio
explicit Authority_Information_Access(const std::string& ocsp) :
m_ocsp_responder(ocsp) {}
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& /* status */,
- const std::vector<X509_Certificate>& /* cert_path */) {}
private:
std::string oid_name() const override
{ return "PKIX.AuthorityInformationAccess"; }
@@ -392,8 +385,6 @@ class BOTAN_DLL CRL_Number final : public Certificate_Extension
size_t get_crl_number() const;
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& /* status */,
- const std::vector<X509_Certificate>& /* cert_path */) {}
private:
std::string oid_name() const override { return "X509v3.CRLNumber"; }
@@ -419,8 +410,6 @@ class BOTAN_DLL CRL_ReasonCode final : public Certificate_Extension
CRL_Code get_reason() const { return m_reason; }
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& /* status */,
- const std::vector<X509_Certificate>& /* cert_path */) {}
private:
std::string oid_name() const override { return "X509v3.ReasonCode"; }
@@ -460,8 +449,6 @@ class BOTAN_DLL CRL_Distribution_Points final : public Certificate_Extension
std::vector<Distribution_Point> distribution_points() const
{ return m_distribution_points; }
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& /* status */,
- const std::vector<X509_Certificate>& /* cert_path */) {}
private:
std::string oid_name() const override
{ return "X509v3.CRLDistributionPoints"; }
@@ -483,14 +470,22 @@ class BOTAN_DLL CRL_Distribution_Points final : public Certificate_Extension
class BOTAN_DLL Unknown_Critical_Extension final : public Certificate_Extension
{
public:
+ explicit Unknown_Critical_Extension(OID oid) : m_oid(oid) {}
+
Unknown_Critical_Extension* copy() const override
- { return new Unknown_Critical_Extension(); }
+ { return new Unknown_Critical_Extension(m_oid); }
- void validate(const X509_Certificate& /* current_cert */, std::set<Certificate_Status_Code>& status,
- const std::vector<X509_Certificate>& /* cert_path */)
+ OID oid_of() const override
+ { return m_oid; };
+
+ void validate(const X509_Certificate&, const X509_Certificate&,
+ const std::vector<X509_Certificate>&,
+ std::vector<std::set<Certificate_Status_Code>>& cert_status,
+ size_t pos) override
{
- status.insert(Certificate_Status_Code::UNKNOWN_CRITICAL_EXTENSION);
+ cert_status.at(pos).insert(Certificate_Status_Code::UNKNOWN_CRITICAL_EXTENSION);
}
+
private:
std::string oid_name() const override
{ return "Unknown OID name"; }
@@ -499,6 +494,8 @@ class BOTAN_DLL Unknown_Critical_Extension final : public Certificate_Extension
std::vector<byte> encode_inner() const override;
void decode_inner(const std::vector<byte>&) override;
void contents_to(Data_Store&, Data_Store&) const override;
+
+ OID m_oid;
};
}
diff --git a/src/lib/cert/x509/x509path.cpp b/src/lib/cert/x509/x509path.cpp
index 3f760cd54..436e27d39 100644
--- a/src/lib/cert/x509/x509path.cpp
+++ b/src/lib/cert/x509/x509path.cpp
@@ -113,12 +113,9 @@ check_chain(const std::vector<X509_Certificate>& cert_path,
// Check issuer constraints
- // TODO: put into Certificate_Extensions::Basic_Constraints::validate()
- // Don't require CA bit set on self-signed end entity cert
if(!issuer.is_CA_cert() && !self_signed_ee_cert)
status.insert(Certificate_Status_Code::CA_CERT_NOT_FOR_CERT_ISSUER);
- // TODO: put into Certificate_Extensions::Basic_Constraints::validate()
if(issuer.path_limit() < i)
status.insert(Certificate_Status_Code::CERT_CHAIN_TOO_LONG);
@@ -144,69 +141,12 @@ check_chain(const std::vector<X509_Certificate>& cert_path,
status.insert(Certificate_Status_Code::UNTRUSTED_HASH);
}
- // TODO: put into Certificate_Extensions::Name_Constraints::validate()
- const NameConstraints& name_constr = issuer.name_constraints();
-
- if(!name_constr.permitted().empty() || !name_constr.excluded().empty())
+ // Check cert extensions
+ Extensions extensions = subject.v3_extensions();
+ for(auto& extension : extensions.extensions())
{
- if(!issuer.is_CA_cert() || !issuer.is_critical("X509v3.NameConstraints"))
- cert_status.at(i).insert(Certificate_Status_Code::NAME_CONSTRAINT_ERROR);
-
- // Check that all subordinate certs pass the name constraint
- for(size_t j = 0; j <= i; ++j)
- {
- if(i == j && at_self_signed_root)
- continue;
-
- bool permitted = name_constr.permitted().empty();
- bool failed = false;
-
- for(auto c: name_constr.permitted())
- {
- switch(c.base().matches(cert_path.at(j)))
- {
- case GeneralName::MatchResult::NotFound:
- case GeneralName::MatchResult::All:
- permitted = true;
- break;
- case GeneralName::MatchResult::UnknownType:
- failed = issuer.is_critical("X509v3.NameConstraints");
- permitted = true;
- break;
- default:
- break;
- }
- }
-
- for(auto c: name_constr.excluded())
- {
- switch(c.base().matches(cert_path.at(j)))
- {
- case GeneralName::MatchResult::All:
- case GeneralName::MatchResult::Some:
- failed = true;
- break;
- case GeneralName::MatchResult::UnknownType:
- failed = issuer.is_critical("X509v3.NameConstraints");
- break;
- default:
- break;
- }
- }
-
- if(failed || !permitted)
- {
- cert_status.at(j).insert(Certificate_Status_Code::NAME_CONSTRAINT_ERROR);
- }
- }
+ extension.first->validate(subject, issuer, cert_path, cert_status, i);
}
-
- // Check cert extensions
- Extensions extensions = subject.v3_extensions();
- for (auto& extension : extensions.extensions())
- {
- extension.first->validate(cert_path[i], status, cert_path);
- }
}
for(size_t i = 0; i != cert_path.size() - 1; ++i)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 02:51:57 +0000