Method read_key_file

phx_percona/percona/sql/sql_acl.cc:11979–12036

@brief Read a key file and store its value in RSA structure @param key_ptr[out] Address of pointer to RSA. This is set to point to a non null value if key is correctly read. @param is_priv_key[in] Whether we are reading private key or public key. @param key_text_buffer[ou

      @retval true               Failure : An appropriate error is raised.
  */
  bool read_key_file(RSA **key_ptr, bool is_priv_key, char **key_text_buffer)
  {
    String key_file_path;
    char *key;
    const char *key_type;
    FILE *key_file= NULL;

    key= is_priv_key ? auth_rsa_private_key_path : auth_rsa_public_key_path;
    key_type= is_priv_key ? "private" : "public";
    *key_ptr= NULL;

    get_key_file_path(key, &key_file_path);

    /*
       Check for existance of private key/public key file.
    */
    if ((key_file= fopen(key_file_path.c_ptr(), "r")) == NULL)
    {
      sql_print_information("RSA %s key file not found: %s."
                            " Some authentication plugins will not work.",
                            key_type, key_file_path.c_ptr());
    }
    else
    {
        *key_ptr= is_priv_key ? PEM_read_RSAPrivateKey(key_file, 0, 0, 0) :
                                PEM_read_RSA_PUBKEY(key_file, 0, 0, 0);

      if (!(*key_ptr))
      {
        char error_buf[MYSQL_ERRMSG_SIZE];
        ERR_error_string_n(ERR_get_error(), error_buf, MYSQL_ERRMSG_SIZE);
        sql_print_error("Failure to parse RSA %s key (file exists): %s:"
                        " %s", key_type, key_file_path.c_ptr(), error_buf);

        /*
          Call ERR_clear_error() just in case there are more than 1 entry in the
          OpenSSL thread's error queue.
        */
        ERR_clear_error();

        return true;
      }

      /* For public key, read key file content into a char buffer. */
      if (!is_priv_key)
      {
        int filesize;
        fseek(key_file, 0, SEEK_END);
        filesize= ftell(key_file);
        fseek(key_file, 0, SEEK_SET);
        *key_text_buffer= new char[filesize+1];
        (void) fread(*key_text_buffer, filesize, 1, key_file);
        (*key_text_buffer)[filesize]= '\0';
      }
      fclose(key_file);
    }
    return false;
  }