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scd: Add genkey command to app-piv (rsa-only)
* scd/app-piv.c (struct genkey_result_s): new. (struct app_local_s): add member genkey_results. (do_deinit): Free that one. (flush_cached_data): Extend to delete all items. (keyref_from_dobj): New. (do_readkey): New. (do_auth): Use keyref_from_dobj. (does_key_exist): New. (genkey_parse_rsa): New. (do_genkey): New. -- We need to extend the GENKEY in command.c to support other algos. Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch
parent
9a9cb0257a
commit
b5b1f72158
362
scd/app-piv.c
362
scd/app-piv.c
@ -38,6 +38,7 @@
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* | Unblock PIN | | | yes | New PIN required |
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* |---------------------------------------------------------------|
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* (9B indicates the 24 byte PIV Card Application Administration Key)
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*
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*/
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#include <config.h>
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@ -152,11 +153,22 @@ struct cache_s {
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};
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/* A cache item used by genkey. */
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struct genkey_result_s {
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struct genkey_result_s *next;
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int keyref;
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gcry_sexp_t s_pkey;
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};
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/* Object with application specific data. */
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struct app_local_s {
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/* A linked list with cached DOs. */
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struct cache_s *cache;
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/* A list with results from recent genkey operations. */
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struct genkey_result_s *genkey_results;
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/* Various flags. */
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struct
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{
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@ -181,12 +193,19 @@ do_deinit (app_t app)
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if (app && app->app_local)
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{
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struct cache_s *c, *c2;
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struct genkey_result_s *gr, *gr2;
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for (c = app->app_local->cache; c; c = c2)
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{
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c2 = c->next;
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xfree (c);
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}
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for (gr = app->app_local->genkey_results; gr; gr = gr2)
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{
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gr2 = gr->next;
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gcry_sexp_release (gr->s_pkey);
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xfree (gr);
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}
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xfree (app->app_local);
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app->app_local = NULL;
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@ -284,14 +303,15 @@ get_cached_data (app_t app, int tag,
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}
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/* Remove data object described by TAG from the cache. */
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/* Remove data object described by TAG from the cache. If TAG is 0
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* all cache iterms are flushed. */
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static void
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flush_cached_data (app_t app, int tag)
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{
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struct cache_s *c, *cprev;
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for (c=app->app_local->cache, cprev=NULL; c; cprev=c, c = c->next)
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if (c->tag == tag)
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if (c->tag == tag || !tag)
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{
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if (cprev)
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cprev->next = c->next;
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@ -860,7 +880,7 @@ do_learn_status (app_t app, ctrl_t ctrl, unsigned int flags)
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}
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/* Core of do-readcert which fetches the certificate based on the
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/* Core of do_readcert which fetches the certificate based on the
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* given tag and returns it in a freshly allocated buffer stored at
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* R_CERT and the length of the certificate stored at R_CERTLEN. */
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static gpg_error_t
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@ -1010,6 +1030,17 @@ find_dobj_by_keyref (app_t app, const char *keyref)
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}
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/* Return the keyref from DOBJ as an integer. If it does not exist,
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* return -1. */
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static int
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keyref_from_dobj (data_object_t dobj)
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{
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if (!dobj || !hexdigitp (dobj->keyref) || !hexdigitp (dobj->keyref+1))
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return -1;
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return xtoi_2 (dobj->keyref);
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}
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/* Read a certificate from the card and returned in a freshly
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* allocated buffer stored at R_CERT and the length of the certificate
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* stored at R_CERTLEN. CERTID is either the OID of the cert's
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@ -1031,6 +1062,70 @@ do_readcert (app_t app, const char *certid,
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}
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/* Return a public key in a freshly allocated buffer. This will only
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* work for a freshly generated key as long as no reset of the
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* application has been performed. This is because we return a cached
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* result from key generation. If no cached result is available, the
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* error GPG_ERR_UNSUPPORTED_OPERATION is returned so that the higher
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* layer can then to get the key by reading the matching certificate.
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* On success a canonical encoded S-expression with the public key is
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* stored at (R_PK,R_PKLEN); the caller must release that buffer. On
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* error R_PK and R_PKLEN are not changed and an error code is
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* returned.
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*/
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static gpg_error_t
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do_readkey (app_t app, int advanced, const char *keyrefstr,
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unsigned char **r_pk, size_t *r_pklen)
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{
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gpg_error_t err;
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data_object_t dobj;
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int keyref;
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struct genkey_result_s *gres;
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unsigned char *pk = NULL;
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size_t pklen;
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dobj = find_dobj_by_keyref (app, keyrefstr);
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if ((keyref = keyref_from_dobj (dobj)) == -1)
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{
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err = gpg_error (GPG_ERR_INV_ID);
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goto leave;
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}
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for (gres = app->app_local->genkey_results; gres; gres = gres->next)
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if (gres->keyref == keyref)
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break;
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if (!gres || !gres->s_pkey)
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{
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err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
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goto leave;
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}
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err = make_canon_sexp (gres->s_pkey, &pk, &pklen);
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if (err)
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goto leave;
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if (advanced)
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{
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/* FIXME: How ugly - we should move that to command.c */
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char *p = canon_sexp_to_string (pk, pklen);
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if (!p)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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xfree (pk);
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pk = p;
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pklen = strlen (pk);
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}
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*r_pk = pk;
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pk = NULL;
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*r_pklen = pklen;
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leave:
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xfree (pk);
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return err;
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}
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/* Given a data object DOBJ return the corresponding PIV algorithm and
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* store it at R_ALGO. The algorithm is taken from the corresponding
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* certificate or from a cache. */
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@ -1553,12 +1648,11 @@ do_auth (app_t app, const char *keyidstr,
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* make sense for X.509 certs? */
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dobj = find_dobj_by_keyref (app, keyidstr);
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if (!dobj)
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if ((keyref = keyref_from_dobj (dobj)) == -1)
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{
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err = gpg_error (GPG_ERR_INV_ID);
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goto leave;
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}
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keyref = xtoi_2 (dobj->keyref);
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err = get_key_algorithm_by_dobj (app, dobj, &algo);
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if (err)
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@ -1714,6 +1808,260 @@ do_auth (app_t app, const char *keyidstr,
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}
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/* Check whether a key for DOBJ already exists. We detect this by
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* reading the certificate described by DOBJ. If FORCE is TRUE a
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* diagnositic will be printed but no error returned if the key
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* already exists. The flag GENERATING is used to select a
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* diagnositic. */
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static gpg_error_t
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does_key_exist (app_t app, data_object_t dobj, int generating, int force)
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{
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void *relptr;
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unsigned char *buffer;
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size_t buflen;
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int found;
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relptr = get_one_do (app, dobj->tag, &buffer, &buflen, NULL);
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found = (relptr && buflen);
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xfree (relptr);
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if (found && !force)
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{
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log_error ("piv: %s", _("key already exists\n"));
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return gpg_error (GPG_ERR_EEXIST);
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}
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if (found)
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log_info ("piv: %s", _("existing key will be replaced\n"));
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else if (generating)
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log_info ("piv: %s", _("generating new key\n"));
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else
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log_info ("piv: %s", _("writing new key\n"));
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return 0;
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}
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/* Parse an RSA response object, consisting of the content of tag
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* 0x7f49, into a gcrypt s-expresstion object and store that R_SEXP.
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* On error NULL is stored at R_SEXP. */
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static gpg_error_t
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genkey_parse_rsa (const unsigned char *data, size_t datalen,
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gcry_sexp_t *r_sexp)
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{
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gpg_error_t err;
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const unsigned char *m, *e;
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unsigned char *mbuf = NULL;
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unsigned char *ebuf = NULL;
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size_t mlen, elen;
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*r_sexp = NULL;
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m = find_tlv (data, datalen, 0x0081, &mlen);
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if (!m)
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{
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log_error (_("response does not contain the RSA modulus\n"));
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err = gpg_error (GPG_ERR_CARD);
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goto leave;
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}
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e = find_tlv (data, datalen, 0x0082, &elen);
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if (!e)
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{
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log_error (_("response does not contain the RSA public exponent\n"));
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err = gpg_error (GPG_ERR_CARD);
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goto leave;
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}
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for (; mlen && !*m; mlen--, m++) /* Strip leading zeroes */
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;
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for (; elen && !*e; elen--, e++) /* Strip leading zeroes */
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;
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mbuf = xtrymalloc (mlen + 1);
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if (!mbuf)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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/* Prepend numbers with a 0 if needed. */
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if (mlen && (*m & 0x80))
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{
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*mbuf = 0;
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memcpy (mbuf+1, m, mlen);
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mlen++;
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}
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else
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memcpy (mbuf, m, mlen);
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ebuf = xtrymalloc (elen + 1);
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if (!ebuf)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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/* Prepend numbers with a 0 if needed. */
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if (elen && (*e & 0x80))
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{
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*ebuf = 0;
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memcpy (ebuf+1, e, elen);
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elen++;
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}
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else
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memcpy (ebuf, e, elen);
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err = gcry_sexp_build (r_sexp, NULL, "(public-key(rsa(n%b)(e%b)))",
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(int)mlen, mbuf, (int)elen, ebuf);
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leave:
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xfree (mbuf);
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xfree (ebuf);
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return err;
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}
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/* Create a new keypair for KEYREF. If KEYTYPE is NULL a default
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* keytype is selected, else it may be one of the strings:
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* "rsa2048", "nistp256, or "nistp384".
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*
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* Supported FLAGS are:
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* APP_GENKEY_FLAG_FORCE Overwrite existing key.
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*
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* Note that CREATETIME is not used for PIV cards.
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*
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* Because there seems to be no way to read the public key we need to
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* retrieve it from a certificate. The GnuPG system however requires
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* the use of app_readkey to fetch the public key from the card to
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* create the certificate; to support this we temporary store the
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* generated public key in the local context for use by app_readkey.
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*/
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static gpg_error_t
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do_genkey (app_t app, ctrl_t ctrl, const char *keyrefstr, const char *keytype,
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unsigned int flags, time_t createtime,
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gpg_error_t (*pincb)(void*, const char *, char **),
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void *pincb_arg)
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{
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gpg_error_t err;
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data_object_t dobj;
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unsigned char *buffer = NULL;
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size_t buflen;
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int force = !!(flags & APP_GENKEY_FLAG_FORCE);
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int mechanism;
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time_t start_at;
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int keyref;
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unsigned char tmpl[5];
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size_t tmpllen;
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const unsigned char *keydata;
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size_t keydatalen;
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gcry_sexp_t s_pkey = NULL;
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struct genkey_result_s *gres;
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(void)ctrl;
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(void)createtime;
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(void)pincb;
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(void)pincb_arg;
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if (!keytype)
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keytype = "rsa2048";
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if (!strcmp (keytype, "rsa2048"))
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mechanism = PIV_ALGORITHM_RSA;
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else if (!strcmp (keytype, "nistp256"))
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mechanism = PIV_ALGORITHM_ECC_P256;
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else if (!strcmp (keytype, "nistp384"))
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mechanism = PIV_ALGORITHM_ECC_P384;
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else
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return gpg_error (GPG_ERR_UNKNOWN_CURVE);
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/* We flush the cache to increase the I/O traffic before a key
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* generation. This _might_ help the card to gather more entropy
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* and is anyway a prerequisite for does_key_exist. */
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flush_cached_data (app, 0);
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/* Check whether a key already exists. */
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dobj = find_dobj_by_keyref (app, keyrefstr);
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if ((keyref = keyref_from_dobj (dobj)) == -1)
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{
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err = gpg_error (GPG_ERR_INV_ID);
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goto leave;
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}
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err = does_key_exist (app, dobj, 1, force);
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if (err)
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goto leave;
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/* FIXME: Check that the authentication has already been done. */
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/* Create the key. */
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log_info (_("please wait while key is being generated ...\n"));
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start_at = time (NULL);
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tmpl[0] = 0xac;
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tmpl[1] = 3;
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tmpl[2] = 0x80;
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tmpl[3] = 1;
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tmpl[4] = mechanism;
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tmpllen = 5;
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err = iso7816_generate_keypair (app->slot, 0, 0, keyref,
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tmpl, tmpllen, 0, &buffer, &buflen);
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if (err)
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{
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log_error (_("generating key failed\n"));
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return gpg_error (GPG_ERR_CARD);
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}
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{
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int nsecs = (int)(time (NULL) - start_at);
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log_info (ngettext("key generation completed (%d second)\n",
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"key generation completed (%d seconds)\n",
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nsecs), nsecs);
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}
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/* Parse the result and store it as an s-expression in a dedicated
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* cache for later retrieval by app_readkey. */
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keydata = find_tlv (buffer, buflen, 0x7F49, &keydatalen);
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if (!keydata || !keydatalen)
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{
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err = gpg_error (GPG_ERR_CARD);
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log_error (_("response does not contain the public key data\n"));
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goto leave;
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}
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if (mechanism == PIV_ALGORITHM_RSA)
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err = genkey_parse_rsa (keydata, keydatalen, &s_pkey);
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else
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err = gpg_error (GPG_ERR_BUG);
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if (err)
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goto leave;
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for (gres = app->app_local->genkey_results; gres; gres = gres->next)
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if (gres->keyref == keyref)
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break;
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if (!gres)
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{
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gres = xtrycalloc (1, sizeof *gres);
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if (!gres)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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gres->keyref = keyref;
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gres->next = app->app_local->genkey_results;
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app->app_local->genkey_results = gres;
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}
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else
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gcry_sexp_release (gres->s_pkey);
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gres->s_pkey = s_pkey;
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s_pkey = NULL;
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leave:
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gcry_sexp_release (s_pkey);
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xfree (buffer);
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return err;
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}
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/* Select the PIV application on the card in SLOT. This function must
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* be used before any other PIV application functions. */
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gpg_error_t
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@ -1801,12 +2149,12 @@ app_select_piv (app_t app)
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app->fnc.deinit = do_deinit;
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app->fnc.learn_status = do_learn_status;
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app->fnc.readcert = do_readcert;
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app->fnc.readkey = NULL;
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app->fnc.readkey = do_readkey;
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app->fnc.getattr = do_getattr;
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app->fnc.setattr = do_setattr;
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/* app->fnc.writecert = do_writecert; */
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/* app->fnc.writekey = do_writekey; */
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/* app->fnc.genkey = do_genkey; */
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app->fnc.genkey = do_genkey;
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/* app->fnc.sign = do_sign; */
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app->fnc.auth = do_auth;
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/* app->fnc.decipher = do_decipher; */
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