Update for v2g module interoperability:

- install certificate check if already contained
- last valid certificate retrieval move in bundle helper
- added certificate directory helper
- added support for the case when the V2G root doesn't contain the full chain

Signed-off-by: ioanbogdan <[email protected]>

include/evse_security.hpp

@@ -132,19 +132,6 @@ class EvseSecurity {
     std::optional<std::string> private_key_password; // used to decrypt encrypted private keys;
 };
 
-/// @brief Custom exception that is thrown when no private key could be found for a selected certificate
-class NoPrivateKeyException : public std::runtime_error {
-public:
-    using std::runtime_error::runtime_error;
-};
-
-/// @brief Custom exception that is thrown when no valid certificate could be found for the specified filesystem
-/// locations
-class NoCertificateValidException : public std::runtime_error {
-public:
-    using std::runtime_error::runtime_error;
-};
-
 } // namespace evse_security
 
 #endif // EVSE_SECURITY_HPP

include/evse_utilities.hpp

@@ -6,6 +6,8 @@
 #include <filesystem>
 #include <fstream>
 #include <iostream>
+#include <limits>
+#include <random>
 
 #include <everest/logging.hpp>
 namespace evse_security {
@@ -16,6 +18,7 @@ class EvseUtils {
         if (std::filesystem::is_regular_file(file_path))
             return std::filesystem::remove(file_path);
 
+        EVLOG_error << "Error deleting file: " << file_path;
         return false;
     }
 
@@ -29,6 +32,7 @@ class EvseUtils {
             }
         }
 
+        EVLOG_error << "Error reading file: " << file_path;
         return false;
     }
 
@@ -56,10 +60,20 @@ class EvseUtils {
     }
 
     static std::string get_random_file_name(const std::string& extension) {
-        char path[] = "XXXXXX";
-        mktemp(path);
+        static std::random_device rd;
+        static std::mt19937 generator(rd());
+        static std::uniform_int_distribution<int> distribution(1, std::numeric_limits<int>::max());
+
+        static int increment = 0;
 
-        return std::string(path) + extension;
+        std::ostringstream buff;
+
+        auto now = std::chrono::system_clock::now();
+        std::time_t time = std::chrono::system_clock::to_time_t(now);
+        buff << std::put_time(std::gmtime(&time), "%m_%d_%Y_%H_%M_%S_") << std::to_string(++increment) << "_"
+             << distribution(generator) << extension;
+
+        return buff.str();
     }
 };
 

include/x509_bundle.hpp

@@ -8,42 +8,86 @@
 
 namespace evse_security {
 
+/// @brief Custom exception that is thrown when no private key could be found for a selected certificate
+class NoPrivateKeyException : public std::runtime_error {
+public:
+    using std::runtime_error::runtime_error;
+};
+
+/// @brief Custom exception that is thrown when no valid certificate could be found for the specified filesystem
+/// locations
+class NoCertificateValidException : public std::runtime_error {
+public:
+    using std::runtime_error::runtime_error;
+};
+
 /// @brief X509 certificate bundle, used for holding multiple X509Wrappers. Supports
-/// operations like add/delete importing/exporting certificates
+/// operations like add/delete importing/exporting certificates. Can use either a
+/// directory with multiple certificates or a single file with one or more certificates
+/// in it. A directory that contains certificate bundle files will not work, the entry
+/// will be ignored
 class X509CertificateBundle {
 public:
     X509CertificateBundle(const std::filesystem::path& path, const EncodingFormat encoding);
     X509CertificateBundle(const std::string& certificate, const EncodingFormat encoding);
 
+    X509CertificateBundle(X509CertificateBundle&& other) = default;
+    X509CertificateBundle(const X509CertificateBundle& other) = delete;
+
 public:
     /// @brief Gets if this certificate bundle comes from a single certificate bundle file
     /// @return
-    bool is_using_bundle_file() {
+    bool is_using_bundle_file() const {
         return (source == X509CertificateSource::FILE);
     }
 
     /// @brief Gets if this certificate bundle comes from an entire directory
     /// @return
-    bool is_using_directory() {
+    bool is_using_directory() const {
         return (source == X509CertificateSource::DIRECTORY);
     }
 
+    /// @return True if multiple certificates are contained within
+    bool is_bundle() const {
+        return (get_certificate_count() > 1);
+    }
+
+    bool empty() const {
+        return certificates.empty();
+    }
+
+    /// @return Contained certificate count
+    int get_certificate_count() const {
+        return certificates.size();
+    }
+
+    std::filesystem::path get_path() const {
+        return path;
+    }
+
+    X509CertificateSource get_source() const {
+        return source;
+    }
+
 public:
     /// @brief Splits the certificate (chain) into single certificates
     /// @return vector containing single certificates
     std::vector<X509Wrapper> split();
 
     /// @brief If we already have the certificate
-    bool contains_certificate(const X509Wrapper& certificate);
+    bool contains_certificate(const X509Wrapper& certificate) const;
     /// @brief If we already have the certificate
-    bool contains_certificate(const CertificateHashData& certificate_hash);
+    bool contains_certificate(const CertificateHashData& certificate_hash) const;
+
+    /// @brief Updates a single certificate in the chain. Only in memory, use @ref export_certificates to filesystem
+    void add_certificate(X509Wrapper&& certificate);
 
     /// @brief Updates a single certificate in the chain. Only in memory, use @ref export_certificates to filesystem
     /// export
     /// @param certificate certificate to update
     /// @return true if the certificate was found and updated, false otherwise. If true is returned the provided
     /// certificate is invalidated
-    bool update_certificate(X509Wrapper& certificate);
+    bool update_certificate(X509Wrapper&& certificate);
 
     /// @brief Deletes a single certificate in the chain. Only in memory, use @ref export_certificates to filesystem
     /// export
@@ -68,7 +112,21 @@ class X509CertificateBundle {
     bool sync_to_certificate_store();
 
 public:
+    const X509Wrapper& get_at(int index) {
+        return certificates.at(index);
+    }
+
+    /// @brief returns the latest valid certificate within this bundle
+    X509Wrapper get_latest_valid_certificate();
+
+public:
+    X509CertificateBundle& operator=(X509CertificateBundle&& other) = default;
+
+public:
+    /// @brief Loads all certificates from the string data that can contain multiple cetifs
     static std::vector<X509_ptr> load_certificates(const std::string& data, const EncodingFormat encoding);
+    /// @brief Returns the latest valid certif that we might contain
+    static X509Wrapper get_latest_valid_certificate(const std::vector<X509Wrapper>& certificates);
 
     static bool is_certificate_file(const std::filesystem::path& file) {
         return std::filesystem::is_regular_file(file) &&
@@ -90,6 +148,28 @@ class X509CertificateBundle {
     X509CertificateSource source;
 };
 
+/// @brief Unlike the bundle, this is loaded only from a directory that can contain a
+/// combination of bundle files and single files. Used for easier operations on the
+/// directory structures. All bundles will use individual files instead of directories
+class X509CertificateDirectory {
+public:
+    X509CertificateDirectory(const std::filesystem::path& directory);
+
+public:
+    /// @brief Iterates through all the contained bundles, while the provided function
+    /// returns true
+    template <typename function> void for_each(function func) {
+        for (const auto& bundle : bundles) {
+            if (!func(bundle))
+                break;
+        }
+    }
+
+private:
+    std::vector<X509CertificateBundle> bundles;
+    std::filesystem::path directory;
+};
+
 } // namespace evse_security
 
 #endif // X509_BUNDLE_HPP

include/x509_wrapper.hpp

@@ -34,6 +34,8 @@ const std::filesystem::path PEM_EXTENSION = ".pem";
 const std::filesystem::path DER_EXTENSION = ".der";
 const std::filesystem::path KEY_EXTENSION = ".key";
 
+using ossl_days_to_seconds = std::chrono::duration<std::int64_t, std::ratio<86400>>;
+
 /// @brief Convenience wrapper around openssl X509 certificate
 class X509Wrapper {
 public:
@@ -104,6 +106,9 @@ class X509Wrapper {
     /// @return
     std::string get_export_string() const;
 
+    /// @brief If the certificate is within the validity date
+    bool is_valid() const;
+
 public:
     X509Wrapper& operator=(X509Wrapper&& other) = default;