Repository: randombit/botan
Pull request #2739 (2021-05-09 11:04:10)

Backport #2738


Patch:
diff --git a/src/lib/utils/parsing.cpp b/src/lib/utils/parsing.cpp
index 8004dbdd0..ff3d4ac0a 100644
--- a/src/lib/utils/parsing.cpp
+++ b/src/lib/utils/parsing.cpp
@@ -324,8 +324,6 @@ std::string replace_char(const std::string& str, char from_char, char to_char)
    return out;
    }
 
-namespace {
-
 std::string tolower_string(const std::string& in)
    {
    std::string s = in;
@@ -338,8 +336,6 @@ std::string tolower_string(const std::string& in)
    return s;
    }
 
-}
-
 bool host_wildcard_match(const std::string& issued_, const std::string& host_)
    {
    const std::string issued = tolower_string(issued_);
diff --git a/src/lib/utils/parsing.h b/src/lib/utils/parsing.h
index 216dbc822..d2c0b5f8c 100644
--- a/src/lib/utils/parsing.h
+++ b/src/lib/utils/parsing.h
@@ -167,6 +167,8 @@ std::map<std::string, std::string> BOTAN_PUBLIC_API(2,8) read_kv(const std::stri
 
 std::string BOTAN_PUBLIC_API(2,0) clean_ws(const std::string& s);
 
+std::string tolower_string(const std::string& s);
+
 /**
 * Check if the given hostname is a match for the specified wildcard
 */
diff --git a/src/lib/x509/name_constraint.cpp b/src/lib/x509/name_constraint.cpp
index 91c644068..c9045729d 100644
--- a/src/lib/x509/name_constraint.cpp
+++ b/src/lib/x509/name_constraint.cpp
@@ -165,17 +165,19 @@ bool GeneralName::matches_dns(const std::string& nam) const
    {
    if(nam.size() == name().size())
       {
-      return nam == name();
+      return tolower_string(nam) == tolower_string(name());
       }
    else if(name().size() > nam.size())
       {
+      // The constraint is longer than the issued name: not possibly a match
       return false;
       }
    else // name.size() < nam.size()
       {
-      std::string constr = name().front() == '.' ? name() : "." + name();
       // constr is suffix of nam
-      return constr == nam.substr(nam.size() - constr.size(), constr.size());
+      const std::string constr = name().front() == '.' ? name() : "." + name();
+      const std::string substr = nam.substr(nam.size() - constr.size(), constr.size());
+      return tolower_string(constr) == tolower_string(substr);
       }
    }
 
diff --git a/src/lib/x509/x509_ext.cpp b/src/lib/x509/x509_ext.cpp
index 7809b5617..e81e15c18 100644
--- a/src/lib/x509/x509_ext.cpp
+++ b/src/lib/x509/x509_ext.cpp
@@ -657,20 +657,17 @@ void Name_Constraints::validate(const X509_Certificate& subject, const X509_Cert
    {
    if(!m_name_constraints.permitted().empty() || !m_name_constraints.excluded().empty())
       {
-      if(!subject.is_CA_cert() || !subject.is_critical("X509v3.NameConstraints"))
+      if(!subject.is_CA_cert())
+         {
          cert_status.at(pos).insert(Certificate_Status_Code::NAME_CONSTRAINT_ERROR);
+         }
 
       const bool issuer_name_constraint_critical =
          issuer.is_critical("X509v3.NameConstraints");
 
-      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)
+      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;
 


Test patch:
diff --git a/src/tests/data/x509/bsi/expected.txt b/src/tests/data/x509/bsi/expected.txt
index 9099ab58a..a3f957a81 100644
--- a/src/tests/data/x509/bsi/expected.txt
+++ b/src/tests/data/x509/bsi/expected.txt
@@ -48,7 +48,7 @@ cert_path_ext_12$Certificate contains duplicate policy
 cert_path_ext_13$Unknown critical extension encountered
 cert_path_ext_14$Unknown critical extension encountered
 cert_path_ext_15$Certificate does not pass name constraint
-cert_path_ext_16$Certificate does not pass name constraint
+cert_path_ext_16$Verified
 #cert_path_ext_17$
 cert_path_ext_18$Unknown critical extension encountered
 cert_path_ext_19$Unknown critical extension encountered
diff --git a/src/tests/data/x509/misc/name_constraint_ci/int.pem b/src/tests/data/x509/misc/name_constraint_ci/int.pem
new file mode 100644
index 000000000..e72186198
--- /dev/null
+++ b/src/tests/data/x509/misc/name_constraint_ci/int.pem
@@ -0,0 +1,101 @@
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diff --git a/src/tests/data/x509/misc/name_constraint_ci/leaf.pem b/src/tests/data/x509/misc/name_constraint_ci/leaf.pem
new file mode 100644
index 000000000..8dbba412e
--- /dev/null
+++ b/src/tests/data/x509/misc/name_constraint_ci/leaf.pem
@@ -0,0 +1,45 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/src/tests/data/x509/misc/name_constraint_ci/root.pem b/src/tests/data/x509/misc/name_constraint_ci/root.pem
new file mode 100644
index 000000000..5762f37e6
--- /dev/null
+++ b/src/tests/data/x509/misc/name_constraint_ci/root.pem
@@ -0,0 +1,33 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/src/tests/data/x509/misc/nc_skip_self/int.pem b/src/tests/data/x509/misc/nc_skip_self/int.pem
new file mode 100644
index 000000000..209bda324
--- /dev/null
+++ b/src/tests/data/x509/misc/nc_skip_self/int.pem
@@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/src/tests/data/x509/misc/nc_skip_self/leaf.pem b/src/tests/data/x509/misc/nc_skip_self/leaf.pem
new file mode 100644
index 000000000..dd1991acd
--- /dev/null
+++ b/src/tests/data/x509/misc/nc_skip_self/leaf.pem
@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
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+j50djA==
+-----END CERTIFICATE-----
diff --git a/src/tests/data/x509/misc/nc_skip_self/root.pem b/src/tests/data/x509/misc/nc_skip_self/root.pem
new file mode 100644
index 000000000..27f99ee35
--- /dev/null
+++ b/src/tests/data/x509/misc/nc_skip_self/root.pem
@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
+MIIFBzCCAu+gAwIBAgIUF/jloc5zNYR3gyPGyMfuC4Qf5cEwDQYJKoZIhvcNAQEL
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+txvJF3BvCIHwTlFAECgg6Je5qu6yWu4T+P4zPhWj1RaYA1i7cuXTXwKKKg==
+-----END CERTIFICATE-----
diff --git a/src/tests/test_x509_path.cpp b/src/tests/test_x509_path.cpp
index 3adc917d4..727d063d6 100644
--- a/src/tests/test_x509_path.cpp
+++ b/src/tests/test_x509_path.cpp
@@ -640,6 +640,98 @@ std::vector<Test::Result> Validate_Name_Constraint_SAN_Test::run()
 
 BOTAN_REGISTER_TEST("x509", "x509_name_constraint_san", Validate_Name_Constraint_SAN_Test);
 
+class Validate_Name_Constraint_CaseInsensitive final : public Test
+   {
+   public:
+      std::vector<Test::Result> run() override;
+   };
+
+std::vector<Test::Result> Validate_Name_Constraint_CaseInsensitive::run()
+   {
+   if(Botan::has_filesystem_impl() == false)
+      {
+      return {Test::Result::Note("Path validation",
+                                 "Skipping due to missing filesystem access")};
+      }
+
+   std::vector<Test::Result> results;
+
+   const std::string root_crt = Test::data_file("/x509/misc/name_constraint_ci/root.pem");
+   const std::string int_crt  = Test::data_file("/x509/misc/name_constraint_ci/int.pem");
+   const std::string ee_crt   = Test::data_file("/x509/misc/name_constraint_ci/leaf.pem");
+
+   auto validation_time =
+      Botan::calendar_point(2021, 5, 8, 1, 0, 0).to_std_timepoint();
+
+   Botan::X509_Certificate root(root_crt);
+   Botan::X509_Certificate intermediate(int_crt);
+   Botan::X509_Certificate ee_cert(ee_crt);
+
+   Botan::Certificate_Store_In_Memory trusted;
+   trusted.add_certificate(root);
+
+   std::vector<Botan::X509_Certificate> chain = { ee_cert, intermediate };
+
+   Botan::Path_Validation_Restrictions restrictions;
+   Botan::Path_Validation_Result validation_result =
+      Botan::x509_path_validate(chain, restrictions, trusted, "",
+                                Botan::Usage_Type::UNSPECIFIED, validation_time);
+
+   Test::Result result("DNS name constraints are case insensitive");
+   result.test_eq("Path validation succeeded",
+                  validation_result.successful_validation(), true);
+
+   return {result};
+   }
+
+BOTAN_REGISTER_TEST("x509", "x509_name_constraint_ci", Validate_Name_Constraint_CaseInsensitive);
+
+class Validate_Name_Constraint_NoCheckSelf final : public Test
+   {
+   public:
+      std::vector<Test::Result> run() override;
+   };
+
+std::vector<Test::Result> Validate_Name_Constraint_NoCheckSelf::run()
+   {
+   if(Botan::has_filesystem_impl() == false)
+      {
+      return {Test::Result::Note("Path validation",
+                                 "Skipping due to missing filesystem access")};
+      }
+
+   std::vector<Test::Result> results;
+
+   const std::string root_crt = Test::data_file("/x509/misc/nc_skip_self/root.pem");
+   const std::string int_crt  = Test::data_file("/x509/misc/nc_skip_self/int.pem");
+   const std::string ee_crt   = Test::data_file("/x509/misc/nc_skip_self/leaf.pem");
+
+   auto validation_time =
+      Botan::calendar_point(2021, 5, 8, 1, 0, 0).to_std_timepoint();
+
+   Botan::X509_Certificate root(root_crt);
+   Botan::X509_Certificate intermediate(int_crt);
+   Botan::X509_Certificate ee_cert(ee_crt);
+
+   Botan::Certificate_Store_In_Memory trusted;
+   trusted.add_certificate(root);
+
+   std::vector<Botan::X509_Certificate> chain = { ee_cert, intermediate };
+
+   Botan::Path_Validation_Restrictions restrictions;
+   Botan::Path_Validation_Result validation_result =
+      Botan::x509_path_validate(chain, restrictions, trusted, "",
+                                Botan::Usage_Type::UNSPECIFIED, validation_time);
+
+   Test::Result result("Name constraints do not apply to the certificate which includes them");
+   result.test_eq("Path validation succeeded",
+                  validation_result.successful_validation(), true);
+
+   return {result};
+   }
+
+BOTAN_REGISTER_TEST("x509", "x509_name_constraint_no_check_self", Validate_Name_Constraint_NoCheckSelf);
+
 class BSI_Path_Validation_Tests final : public Test
 
    {