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scd:piv: Allow writecert to only write matching certs.

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* scd/app-piv.c (do_readkey): Read the key from the cert here instead
of letting the upper layer do this.
(do_writecert): Check that the cert matches the key and that a key has
already been generated.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2019-03-01 12:58:56 +01:00
parent 280baee72d
commit 696d4c290d
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
1 changed files with 55 additions and 22 deletions
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77
scd/app-piv.c
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@ -1450,27 +1450,32 @@ do_readkey (app_t app, const char *keyrefstr,
goto leave; goto leave;
if (!mechanism) if (!mechanism)
{ {
/* We got a certificate. Let the upper layer handle the /* We got a certificate. Extract the pubkey from it. */
* extraction of the key. FIXME: It would be better to have a err = app_help_pubkey_from_cert (cert, certlen, &pk, &pklen);
* shared fucntion to dothis here. */ if (err)
err = gpg_error (GPG_ERR_NOT_FOUND); {
goto leave; log_error ("failed to parse the certificate: %s\n",
gpg_strerror (err));
goto leave;
}
} }
/* Convert the public key into the expected s-expression. */
if (mechanism == PIV_ALGORITHM_RSA)
err = genkey_parse_rsa (cert, certlen, &s_pkey);
else if (mechanism == PIV_ALGORITHM_ECC_P256
|| mechanism == PIV_ALGORITHM_ECC_P384)
err = genkey_parse_ecc (cert, certlen, mechanism, &s_pkey);
else else
err = gpg_error (GPG_ERR_PUBKEY_ALGO); {
if (err) /* Convert the public key into the expected s-expression. */
goto leave; if (mechanism == PIV_ALGORITHM_RSA)
err = genkey_parse_rsa (cert, certlen, &s_pkey);
else if (mechanism == PIV_ALGORITHM_ECC_P256
|| mechanism == PIV_ALGORITHM_ECC_P384)
err = genkey_parse_ecc (cert, certlen, mechanism, &s_pkey);
else
err = gpg_error (GPG_ERR_PUBKEY_ALGO);
if (err)
goto leave;
err = make_canon_sexp (s_pkey, &pk, &pklen); err = make_canon_sexp (s_pkey, &pk, &pklen);
if (err) if (err)
goto leave; goto leave;
}
*r_pk = pk; *r_pk = pk;
pk = NULL; pk = NULL;
@ -2735,6 +2740,9 @@ do_writecert (app_t app, ctrl_t ctrl,
{ {
gpg_error_t err; gpg_error_t err;
data_object_t dobj; data_object_t dobj;
unsigned char *pk = NULL;
unsigned char *orig_pk = NULL;
size_t pklen, orig_pklen;
(void)ctrl; (void)ctrl;
(void)pincb; /* Not used; instead authentication is needed. */ (void)pincb; /* Not used; instead authentication is needed. */
@ -2746,10 +2754,33 @@ do_writecert (app_t app, ctrl_t ctrl,
/* FIXME: Check that the authentication has already been done. */ /* FIXME: Check that the authentication has already been done. */
/* FIXME: Check that the public key parameters from the certificate
* match an already stored key. */
flush_cached_data (app, dobj->tag); flush_cached_data (app, dobj->tag);
/* Check that the public key parameters from the certificate match
* an already stored key. Note that we do not allow writing a
* certificate if no key has yet been created (GPG_ERR_NOT_FOUND) or
* if there is a problem reading the public key from the certificate
* GPG_ERR_NO_PUBKEY). We enforce this because otherwise the only
* way to detect whether a key exists is by trying to use that
* key. */
err = do_readkey (app, certrefstr, &orig_pk, &orig_pklen);
if (err)
{
if (gpg_err_code (err) == GPG_ERR_NOT_FOUND)
err = gpg_error (GPG_ERR_NO_SECKEY); /* Use a better error code. */
goto leave;
}
/* Compare pubkeys. */
err = app_help_pubkey_from_cert (cert, certlen, &pk, &pklen);
if (err)
goto leave; /* No public key in new certificate. */
if (orig_pklen != pklen || memcmp (orig_pk, pk, pklen))
{
err = gpg_error (GPG_ERR_CONFLICT);
goto leave;
}
err = put_data (app->slot, dobj->tag, err = put_data (app->slot, dobj->tag,
(int)0x70, (size_t)certlen, cert,/* Certificate */ (int)0x70, (size_t)certlen, cert,/* Certificate */
(int)0x71, (size_t)1, "", /* No compress */ (int)0x71, (size_t)1, "", /* No compress */
@ -2762,7 +2793,9 @@ do_writecert (app_t app, ctrl_t ctrl,
log_error ("piv: failed to write cert to %s: %s\n", log_error ("piv: failed to write cert to %s: %s\n",
dobj->keyref, gpg_strerror (err)); dobj->keyref, gpg_strerror (err));
leave:
xfree (pk);
xfree (orig_pk);
return err; return err;
} }