对于一个项目,我需要在apache级别进行HMAC身份验证。因此,我将解释的mod_示例扩展到这一点:

module AP_MODULE_DECLARE_DATA   hmac_module =
        {
                STANDARD20_MODULE_STUFF,
                NULL,            // Per-directory configuration handler
                NULL,            // Merge handler for per-directory configurations
                NULL,            // Per-server configuration handler
                NULL,            // Merge handler for per-server configurations
                NULL,            // Any directives we may have for httpd
                register_hooks   // Our hook registering function
        };


/* register_hooks: Adds a hook to the httpd process */
static void register_hooks(apr_pool_t *pool)
{

    /* Hook the request handler */
    ap_hook_handler(hmac_handler, NULL, NULL,APR_HOOK_REALLY_FIRST);
}

static int hmac_handler(request_rec *r)
{
    // ...
    // some variable definition
    // ...

    // Check that the "hmac-handler" handler is being called.
    if (!r->handler || strcmp(r->handler, "hmac-handler")) return (DECLINED);

    ap_args_to_table(r, &GET);
    ap_parse_form_data(r, NULL, &POST, -1, 8192);

    timestamp = apr_table_get(r->headers_in, "X-EPOCH");
    claimedHash = apr_table_get(r->headers_in, "X-HMAC");
    if (!timestamp){
        ap_log_rerror(APLOG_MARK,APLOG_ERR,HTTP_FORBIDDEN,r,"Timestamp does not exits in request");
        return HTTP_FORBIDDEN;
    }
    if(!claimedHash){
        ap_log_rerror(APLOG_MARK,APLOG_ERR,HTTP_FORBIDDEN,r,"There is no claimed hash in the request!");
        return HTTP_FORBIDDEN;
    }

    //...
    // calculate timestamp's sha1 hash
    //...

    if(strcmp(claimedHash,encoded)){
        ap_log_rerror(APLOG_MARK,APLOG_ERR,HTTP_FORBIDDEN,r,"Claimed hash and digested values does not match,Claimed:%s , Target:%s",claimedHash,encoded);
        return HTTP_FORBIDDEN;
    }

    // Let Apache know that we responded to this request.
    return OK;
}

现在,我需要在apache中钩住这个模块,然后再进一步处理它,以检查这个请求是否经过身份验证。
我知道APR_HOOK_REALLY_FIRST函数中的ap_hook_handler参数使apache在任何其他处理程序之前执行此处理程序。
但我需要知道如何使这个处理程序在特定目录中发生任何请求之前执行。

最佳答案

我终于自己明白了。与在处理程序阶段注册钩子不同,我应该在前面的阶段注册我的模块:访问检查程序。
如果有人感兴趣,可以在github找到最终代码。

关于c - 在每个请求中都添加一个自定义的apache模块 Hook ?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/42327958/

10-11 22:39
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