/*

* Certificate Store

* (C) 1999-2010,2013 Jack Lloyd

* (C) 2017 Fabian Weissberg, Rohde & Schwarz Cybersecurity

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#include <botan/certstor.h>

#include <botan/pkix_types.h>

#include <botan/internal/filesystem.h>

#include <botan/hash.h>

#include <botan/data_src.h>

namespace Botan {

Certificate_Store::~Certificate_Store() {}

std::optional<X509_Certificate>

Certificate_Store::find_cert(const X509_DN& subject_dn, const std::vector<uint8_t>& key_id) const

   {

   const auto certs = find_all_certs(subject_dn, key_id);

   if(certs.empty())

      {

      return std::nullopt;

      }

   // `count` might be greater than 1, but we'll just select the first match

   return certs.front();

   }

std::optional<X509_CRL> Certificate_Store::find_crl_for(const X509_Certificate&) const

   {

   return std::nullopt;

   }

void Certificate_Store_In_Memory::add_certificate(const X509_Certificate& cert)

   {

   for(const auto& c : m_certs)

      if(c == cert)

         return;

   m_certs.push_back(cert);

   }

std::vector<X509_DN> Certificate_Store_In_Memory::all_subjects() const

   {

   std::vector<X509_DN> subjects;

   for(const auto& cert : m_certs)

      subjects.push_back(cert.subject_dn());

   return subjects;

   }

std::optional<X509_Certificate>

Certificate_Store_In_Memory::find_cert(const X509_DN& subject_dn,

                                       const std::vector<uint8_t>& key_id) const

   {

   for(const auto& cert : m_certs)

      {

      // Only compare key ids if set in both call and in the cert

      if(key_id.size())

         {

         std::vector<uint8_t> skid = cert.subject_key_id();

         if(skid.size() && skid != key_id) // no match

            continue;

         }

      if(cert.subject_dn() == subject_dn)

         return cert;

      }

   return std::nullopt;

   }

std::vector<X509_Certificate> Certificate_Store_In_Memory::find_all_certs(

      const X509_DN& subject_dn,

      const std::vector<uint8_t>& key_id) const

   {

   std::vector<X509_Certificate> matches;

   for(const auto& cert : m_certs)

      {

      if(key_id.size())

         {

         std::vector<uint8_t> skid = cert.subject_key_id();

         if(skid.size() && skid != key_id) // no match

            continue;

         }

      if(cert.subject_dn() == subject_dn)

         matches.push_back(cert);

      }

   return matches;

   }

std::optional<X509_Certificate>

Certificate_Store_In_Memory::find_cert_by_pubkey_sha1(const std::vector<uint8_t>& key_hash) const

   {

   if(key_hash.size() != 20)

      throw Invalid_Argument("Certificate_Store_In_Memory::find_cert_by_pubkey_sha1 invalid hash");

   std::unique_ptr<HashFunction> hash(HashFunction::create("SHA-1"));

   for(const auto& cert : m_certs){

      hash->update(cert.subject_public_key_bitstring());

      if(key_hash == hash->final_stdvec()) //final_stdvec also clears the hash to initial state

         return cert;

   }

   return std::nullopt;

   }

std::optional<X509_Certificate>

Certificate_Store_In_Memory::find_cert_by_raw_subject_dn_sha256(const std::vector<uint8_t>& subject_hash) const

   {

   if(subject_hash.size() != 32)

      throw Invalid_Argument("Certificate_Store_In_Memory::find_cert_by_raw_subject_dn_sha256 invalid hash");

   std::unique_ptr<HashFunction> hash(HashFunction::create("SHA-256"));

   for(const auto& cert : m_certs){

      hash->update(cert.raw_subject_dn());

      if(subject_hash == hash->final_stdvec()) //final_stdvec also clears the hash to initial state

         return cert;

   }

   return std::nullopt;

   }

void Certificate_Store_In_Memory::add_crl(const X509_CRL& crl)

   {

   X509_DN crl_issuer = crl.issuer_dn();

   for(auto& c : m_crls)

      {

      // Found an update of a previously existing one; replace it

      if(c.issuer_dn() == crl_issuer)

         {

         if(c.this_update() <= crl.this_update())

            c = crl;

         return;

         }

      }

   // Totally new CRL, add to the list

   m_crls.push_back(crl);

   }

std::optional<X509_CRL> Certificate_Store_In_Memory::find_crl_for(const X509_Certificate& subject) const

   {

   const std::vector<uint8_t>& key_id = subject.authority_key_id();

   for(const auto& c : m_crls)

      {

      // Only compare key ids if set in both call and in the CRL

      if(key_id.size())

         {

         std::vector<uint8_t> akid = c.authority_key_id();

         if(akid.size() && akid != key_id) // no match

            continue;

         }

      if(c.issuer_dn() == subject.issuer_dn())

         return c;

      }

   return {};

   }

Certificate_Store_In_Memory::Certificate_Store_In_Memory(const X509_Certificate& cert)

   {

   add_certificate(cert);

   }

#if defined(BOTAN_TARGET_OS_HAS_FILESYSTEM)

Certificate_Store_In_Memory::Certificate_Store_In_Memory(const std::string& dir)

   {

   if(dir.empty())

      return;

   std::vector<std::string> maybe_certs = get_files_recursive(dir);

   if(maybe_certs.empty())

      {

      maybe_certs.push_back(dir);

      }

   for(auto&& cert_file : maybe_certs)

      {

      try

         {

         DataSource_Stream src(cert_file, true);

         while(!src.end_of_data())

            {

            try

               {

               X509_Certificate cert(src);

               m_certs.push_back(cert);

               }

            catch(std::exception&)

               {

               // stop searching for other certificate at first exception

               break;

               }

            }

         }

      catch(std::exception&)

         {

         }

      }

   }

#endif

}