Re: OpenSSL dynamic engine loading shows error

Dmitry Belyavsky <beldmit@xxxxxxxxx> · Thu, 26 Aug 2021 15:38:39 +0200

Dear Shariful,
1. Don't hurry :)
2. It looks like there are some more configuration options in your openssl.cnf [rsa_section] 
I think they came from the standard configuration. So if I am wrong, please provide the whole file.
3. I'd recommend you also update the lines
`
static const char *engine_dasync_id = "dasync";
static const char *engine_dasync_name = "Dummy Async engine support";
`
To be consistent with your engine name

On Thu, Aug 26, 2021 at 3:24 PM Shariful Alam <dipto181@xxxxxxxxx> wrote:
Any help regarding this matter??
Regards,
Shariful 

On Thu, Aug 26, 2021, 12:06 AM Shariful Alam <dipto181@xxxxxxxxx> wrote:
Hello,
I have a simple rsa engine code (from engines/e_dasync.c). My code compiles. Command "$openssl engine -t -c" shows the following,

 openssl engine -t -c
(rdrand) Intel RDRAND engine
 [RAND]
     [ available ]
(dynamic) Dynamic engine loading support
     [ unavailable ]
(dasync) Dummy Async engine support
 [RSA]
     [ available ]

I also modify openssl.cnf configuration as following to load this engine,

openssl_conf = openssl_def

[openssl_def]
engines = engine_section

[engine_section]
rsa-engine-new = rsa_section

[rsa_section]
engine_id = rsa-engine-new

Then when I run the command "$openssl engine", I get the following error,
$openssl engine
(rdrand) Intel RDRAND engine
(dynamic) Dynamic engine loading support
(dasync) Dummy Async engine support
139633213376256:error:260AB089:engine routines:ENGINE_ctrl_cmd_string:invalid cmd name:crypto/engine/eng_ctrl.c:255:
139633213376256:error:260BC066:engine routines:int_engine_configure:engine configuration error:crypto/engine/eng_cnf.c:141:section=rsa_section, name=oid_section, value=new_oids
139633213376256:error:0E07606D:configuration file routines:module_run:module initialization error:crypto/conf/conf_mod.c:177:module=engines, value=engine_section, retcode=-1   

Any help why is this happening? How can I fix this? 
My goal is to use my OpenSSL engine with Apache for mod_ssl. Do I have to compile my engine with the OpenSSL source code to do that? 

Here is the complete source code of my sample engine,
==============================================

#include <stdio.h>
#include <string.h>

#include <openssl/engine.h>
#include <openssl/sha.h>
#include <openssl/aes.h>
#include <openssl/rsa.h>
#include <openssl/evp.h>
#include <openssl/async.h>
#include <openssl/bn.h>
#include <openssl/crypto.h>
#include <openssl/ssl.h>
#include <openssl/modes.h>

/* Engine Id and Name */
static const char *engine_dasync_id = "dasync";
static const char *engine_dasync_name = "Dummy Async engine support";

static int dasync_pub_enc(int flen, const unsigned char *from,
                    unsigned char *to, RSA *rsa, int padding) {
	printf("dasync_pub_enc\n");

	return 0;
}

static int dasync_pub_dec(int flen, const unsigned char *from,
                    unsigned char *to, RSA *rsa, int padding) {
	printf("dasync_pub_dec\n");

	return 0;
}

static int dasync_rsa_priv_enc(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding){
    	printf("dasync_rsa_priv_enc\n");
	return 0;	
}

static int dasync_rsa_priv_dec(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding){
	printf("dasync_rsa_priv_dec\n");
	return 0;
}

static RSA_METHOD *dasync_rsa_method = NULL;

static int bind_dasync(ENGINE *e){
    /* Setup RSA_METHOD */
    if ((dasync_rsa_method = RSA_meth_new("Dummy Async RSA method", 0)) == NULL
        || RSA_meth_set_pub_enc(dasync_rsa_method, dasync_pub_enc) == 0
        || RSA_meth_set_pub_dec(dasync_rsa_method, dasync_pub_dec) == 0
        || RSA_meth_set_priv_enc(dasync_rsa_method, dasync_rsa_priv_enc) == 0
        || RSA_meth_set_priv_dec(dasync_rsa_method, dasync_rsa_priv_dec) == 0
	) {

        return 0;
    }

    /* Ensure the dasync error handling is set up */

    if (!ENGINE_set_id(e, engine_dasync_id)
        || !ENGINE_set_name(e, engine_dasync_name)
        || !ENGINE_set_RSA(e, dasync_rsa_method)
       	) {
        return 0;
    }
    return 1;
}

static int bind_helper(ENGINE *e, const char *id){
    if (!bind_dasync(e)){
	printf("2_Error: Inside Bind helper\n");
        return 0;
	}
    return 1;
}

IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
IMPLEMENT_DYNAMIC_CHECK_FN()

=============================================

Thanks,
Shariful   

-- 
SY, Dmitry Belyavsky