Hi, list
2008/5/12 Isaias Punktin <[EMAIL PROTECTED]>:
> Hi all.
>
> I have been reading the code of openssl/apps/ts.c and there is no
> possible for the TSA to sign using a private key stored in a
> token/SmartCard/engine. I think this is interesting because it makes
> possible to make a TSA compliant with RFC 3628 ("Requirements for
> Time-Stamping Authorities"). Is somebody working on this?
>
> Thanks for all.
>
> Punkto
>
I have been looking for a solution for the problem about using ts with
private keys placed into engines. I have made a patch for ts, in the
bottom of this mail, that solves the problem for me.
You can see that I had to create a new option called "keyform" where the
user selects a PEM key or an ENGINE key. I use load_key function in
order to load the private key wherever it is.
With this patch there is no need to change any application that uses ts
because the key format is PEM if the option is not specified. The id of
the engine can be written in the same formats that OpenSSL uses. So, in
my tests i use commands like this:
ts -config CAtsa.cnf -reply -section tsa_config1 -queryfile req.tsq -out
res.tsr -engine pkcs11 -keyform ENGINE -inkey id_50
Please, can you see if this patch can be added to OpenSSL source? Maybe
you don't have any SmartCards to play with and make tests. But, at
least, you can check using the tests you have in order to see if ts
works well with no engines using this patch.
Thanks in advance.
Jorge Muñoz
PS: As you can see, I have only changed ts.c. The diff was applied to
the OpenTSA patch for OpenSSL version 0.9.8c.
--- ./ts.c.orig 2008-07-18 16:05:17.000000000 +0200
+++ ./ts.c 2008-07-21 12:44:09.000000000 +0200
@@ -93,13 +93,13 @@
static ASN1_INTEGER *create_nonce(int bits);
/* Reply related functions. */
-static int reply_command(CONF *conf, char *section, char *engine,
+static int reply_command(CONF *conf, char *section, char *engine, int
keyform,
char *queryfile, char *passin, char *inkey,
char *signer, char *chain, const char *policy,
char *in, int token_in, char *out, int token_out,
int text);
static TS_RESP *read_PKCS7(BIO *in_bio);
-static TS_RESP *create_response(CONF *conf, const char *section, char
*engine,
+static TS_RESP *create_response(CONF *conf, const char *section, char
*engine, int keyform,
char *queryfile, char *passin, char *inkey,
char *signer, char *chain, const char
*policy);
static ASN1_INTEGER * MS_CALLBACK serial_cb(TS_RESP_CTX *ctx, void *data);
@@ -348,7 +348,7 @@
if (ret) goto usage;
}
- ret = !reply_command(conf, section, engine, queryfile,
+ ret = !reply_command(conf, section, engine, keyform,
queryfile,
password, inkey, signer, chain, policy,
in, token_in, out, token_out, text);
break;
@@ -670,7 +670,7 @@
* Reply-related method definitions.
*/
-static int reply_command(CONF *conf, char *section, char *engine,
+static int reply_command(CONF *conf, char *section, char *engine, int
keyform,
char *queryfile, char *passin, char *inkey,
char *signer, char *chain, const char *policy,
char *in, int token_in,
@@ -702,7 +702,7 @@
}
else
{
- response = create_response(conf, section, engine,
queryfile,
+ response = create_response(conf, section, engine,
keyform, queryfile,
passin, inkey, signer, chain,
policy);
if (response)
@@ -797,7 +797,7 @@
return resp;
}
-static TS_RESP *create_response(CONF *conf, const char *section, char
*engine,
+static TS_RESP *create_response(CONF *conf, const char *section, char
*engine, int keyform,
char *queryfile, char *passin, char *inkey,
char *signer, char *chain, const char
*policy)
{
@@ -805,6 +805,8 @@
TS_RESP *response = NULL;
BIO *query_bio = NULL;
TS_RESP_CTX *resp_ctx = NULL;
+ EVP_PKEY *sigkey = NULL;
+ ENGINE *e = NULL;
if (!(query_bio = BIO_new_file(queryfile, "rb")))
goto end;
@@ -829,8 +831,26 @@
if (!TS_CONF_set_certs(conf, section, chain, resp_ctx)) goto end;
/* Setting TSA signer private key. */
- if (!TS_CONF_set_signer_key(conf, section, inkey, passin,
resp_ctx))
+#ifndef OPENSSL_NO_ENGINE
+ e = setup_engine(bio_err, engine, 0);
+#endif
+ if (!inkey)
+ inkey = NCONF_get_string(conf, section, "signer_key");
+ if (!inkey)
+ {
+ BIO_printf(bio_err, "variable lookup failed for
section::signer_key\n");
+ goto end;
+ }
+
+
+ sigkey = load_key(bio_err, inkey, keyform, 0, passin, e, "key
file");
+ if (!sigkey)
+ {
+ /* load_key() has already printed an appropriate message */
goto end;
+ }
+ if (!TS_RESP_CTX_set_signer_key(resp_ctx, sigkey)) goto end;
+
/* Setting default policy OID. */
if (!TS_CONF_set_def_policy(conf, section, policy, resp_ctx))
goto end;
@@ -869,6 +889,7 @@
response = NULL;
}
TS_RESP_CTX_free(resp_ctx);
+ EVP_PKEY_free(sigkey);
BIO_free_all(query_bio);
return response;
--
Jorge Muñoz Castañer
e-mail: jorgem(en)det.uvigo.es
Departamento de Ingeniería Telemática
Universidad de Vigo
ETSI Telecomunicación
Campus 36310 Vigo SPAIN
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