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Perl 安全
本文档在 common/security.md 的基础上扩展了 Perl 相关的内容。
污染模式
- 在所有 CGI/面向 Web 的脚本中使用
-T标志 - 在执行任何外部命令前,清理
%ENV($ENV{PATH}、$ENV{CDPATH}等)
输入验证
- 使用允许列表正则表达式进行去污化 — 绝不要使用
/(.*)/s - 使用明确的模式验证所有用户输入:
if ($input =~ /\A([a-zA-Z0-9_-]+)\z/) {
my $clean = $1;
}
文件 I/O
- 仅使用三参数 open — 绝不要使用两参数 open
- 使用
Cwd::realpath防止路径遍历:
use Cwd 'realpath';
my $safe_path = realpath($user_path);
die "Path traversal" unless $safe_path =~ m{\A/allowed/directory/};
进程执行
- 使用 列表形式的
system()— 绝不要使用单字符串形式 - 使用 IPC::Run3 来捕获输出
- 绝对不要在反引号中使用变量插值
system('grep', '-r', $pattern, $directory); # safe
SQL 注入预防
始终使用 DBI 占位符 — 绝不要将变量插值到 SQL 中:
my $sth = $dbh->prepare('SELECT * FROM users WHERE email = ?');
$sth->execute($email);
安全扫描
运行 perlcritic 并使用安全主题,严重级别设为 4 或更高:
perlcritic --severity 4 --theme security lib/
参考
有关全面的 Perl 安全模式、污染模式和安全 I/O,请参阅技能:perl-security。