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scd: Implement direct access by KEYGRIP for GETATTR and READKEY.

Browse Source 
* scd/app-openpgp.c (do_readkey): Handle KEYGRIP access.
* scd/command.c (do_readkey): New.
(cmd_readkey): Use do_readkey supporting KEYGRIP access.
(cmd_getattr): Supporting KEYGRIP access.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2020-01-10 15:58:49 +09:00
parent 63bda3aad8
commit 0cfded4bb1
2 changed files with 127 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
scd/app-openpgp.c
View File

@ -1920,7 +1920,21 @@ do_readkey (app_t app, ctrl_t ctrl, const char *keyid, unsigned int flags,
int keyno;
unsigned char *buf;
if (!strcmp (keyid, "OPENPGP.1"))
if (strlen (keyid) == 40)
{
const unsigned char *keygrip_str;
for (keyno = 0; keyno < 3; keyno++)
{
keygrip_str = app->app_local->pk[keyno].keygrip_str;
if (!strncmp (keygrip_str, keyid, 40))
break;
}
if (keyno >= 3)
return gpg_error (GPG_ERR_INV_ID);
}
else if (!strcmp (keyid, "OPENPGP.1"))
keyno = 0;
else if (!strcmp (keyid, "OPENPGP.2"))
keyno = 1;

169
scd/command.c
View File

@ -537,8 +537,74 @@ cmd_readcert (assuan_context_t ctx, char *line)
}
static gpg_error_t
do_readkey (card_t card, ctrl_t ctrl, const char *line,
int opt_info, int opt_nokey,
unsigned char **pk_p, size_t *pklen_p)
{
int rc;
/* If the application supports the READKEY function we use that.
Otherwise we use the old way by extracting it from the
certificate. */
rc = app_readkey (card, ctrl, line,
opt_info? APP_READKEY_FLAG_INFO : 0,
opt_nokey? NULL : pk_p, pklen_p);
if (!rc)
/* Okay, got that key. */
return 0;
if (gpg_err_code (rc) == GPG_ERR_UNSUPPORTED_OPERATION
|| gpg_err_code (rc) == GPG_ERR_NOT_FOUND)
{
unsigned char *cert = NULL;
size_t ncert;
/* Fall back to certificate reading. */
rc = app_readcert (card, ctrl, line, &cert, &ncert);
if (rc)
{
log_error ("app_readcert failed: %s\n", gpg_strerror (rc));
return rc;
}
rc = app_help_pubkey_from_cert (cert, ncert, pk_p, pklen_p);
xfree (cert);
if (rc)
{
log_error ("failed to parse the certificate: %s\n",
gpg_strerror (rc));
return rc;
}
if (opt_info)
{
char keygripstr[KEYGRIP_LEN*2+1];
rc = app_help_get_keygrip_string_pk (*pk_p, *pklen_p, keygripstr);
if (rc)
{
log_error ("app_help_get_keygrip_string failed: %s\n",
gpg_strerror (rc));
return rc;
}
/* FIXME: Using LINE is not correct because it might be an
* OID and has not been canonicalized (i.e. uppercased). */
send_status_info (ctrl, "KEYPAIRINFO",
keygripstr, strlen (keygripstr),
line, strlen (line),
NULL, (size_t)0);
}
}
else
log_error ("app_readkey failed: %s\n", gpg_strerror (rc));
return rc;
}
static const char hlp_readkey[] =
"READKEY [--advanced] [--info[-only]] <keyid>|<oid>\n"
"READKEY [--advanced] [--info[-only]] <keyid>|<oid>|<keygrip>\n"
"\n"
"Return the public key for the given cert or key ID as a standard\n"
"S-expression. With --advanced the S-expression is returned in\n"
@ -552,9 +618,10 @@ cmd_readkey (assuan_context_t ctx, char *line)
int advanced = 0;
int opt_info = 0;
int opt_nokey = 0;
unsigned char *cert = NULL;
unsigned char *pk = NULL;
size_t ncert, pklen;
size_t pklen;
card_t card;
int direct = 0;
if ((rc = open_card (ctrl)))
return rc;
@ -569,57 +636,26 @@ cmd_readkey (assuan_context_t ctx, char *line)
line = skip_options (line);
line = xstrdup (line); /* Need a copy of the line. */
/* If the application supports the READKEY function we use that.
Otherwise we use the old way by extracting it from the
certificate. */
rc = app_readkey (ctrl->card_ctx, ctrl, line,
opt_info? APP_READKEY_FLAG_INFO : 0,
opt_nokey? NULL : &pk, &pklen);
if (!rc)
; /* Okay, got that key. */
else if (gpg_err_code (rc) == GPG_ERR_UNSUPPORTED_OPERATION
|| gpg_err_code (rc) == GPG_ERR_NOT_FOUND)
if (strlen (line) == 40)
{
/* Fall back to certificate reading. */
rc = app_readcert (ctrl->card_ctx, ctrl, line, &cert, &ncert);
if (rc)
{
log_error ("app_readcert failed: %s\n", gpg_strerror (rc));
goto leave;
}
rc = app_help_pubkey_from_cert (cert, ncert, &pk, &pklen);
if (rc)
{
log_error ("failed to parse the certificate: %s\n",
gpg_strerror (rc));
goto leave;
}
if (opt_info)
{
char keygripstr[KEYGRIP_LEN*2+1];
rc = app_help_get_keygrip_string_pk (pk, pklen, keygripstr);
if (rc)
{
log_error ("app_help_get_keygrip_string failed: %s\n",
gpg_strerror (rc));
goto leave;
}
/* FIXME: Using LINE is not correct because it might be an
* OID and has not been canonicalized (i.e. uppercased). */
send_status_info (ctrl, "KEYPAIRINFO",
keygripstr, strlen (keygripstr),
line, strlen (line),
NULL, (size_t)0);
}
card = app_do_with_keygrip (ctrl, KEYGRIP_ACTION_LOOKUP, line, 0);
direct = 1;
}
else
card = ctrl->card_ctx;
if (card)
{
log_error ("app_readkey failed: %s\n", gpg_strerror (rc));
goto leave;
if (direct)
card_ref (card);
rc = do_readkey (card, ctrl, line, opt_info, opt_nokey, &pk, &pklen);
if (direct)
card_unref (card);
}
else
rc = gpg_error (GPG_ERR_NO_SECKEY);
if (opt_nokey)
;
@ -653,7 +689,6 @@ cmd_readkey (assuan_context_t ctx, char *line)
leave:
xfree (pk);
xfree (cert);
return rc;
}
@ -1004,7 +1039,7 @@ cmd_pkdecrypt (assuan_context_t ctx, char *line)
static const char hlp_getattr[] =
"GETATTR <name>\n"
"GETATTR <name> [<keygrip>]\n"
"\n"
"This command is used to retrieve data from a smartcard. The\n"
"allowed names depend on the currently selected smartcard\n"
@ -1014,13 +1049,16 @@ static const char hlp_getattr[] =
"However, the current implementation assumes that Name is not escaped;\n"
"this works as long as no one uses arbitrary escaping. \n"
"\n"
"Note, that this function may even be used on a locked card.";
"Note, that this function may even be used on a locked card.\n"
"When KEYGRIP is specified, it accesses directly with the KEYGRIP.";
static gpg_error_t
cmd_getattr (assuan_context_t ctx, char *line)
{
ctrl_t ctrl = assuan_get_pointer (ctx);
int rc;
const char *keyword;
card_t card;
int direct = 0;
if ((rc = open_card (ctrl)))
return rc;
@ -1029,13 +1067,30 @@ cmd_getattr (assuan_context_t ctx, char *line)
for (; *line && !spacep (line); line++)
;
if (*line)
*line++ = 0;
*line++ = 0;
/* (We ignore any garbage for now.) */
if (strlen (line) == 40)
{
card = app_do_with_keygrip (ctrl, KEYGRIP_ACTION_LOOKUP, line, 0);
direct = 1;
}
else
card = ctrl->card_ctx;
/* FIXME: Applications should not return sensitive data if the card
is locked. */
rc = app_getattr (ctrl->card_ctx, ctrl, keyword);
if (card)
{
if (direct)
card_ref (card);
/* FIXME: Applications should not return sensitive data if the card
is locked. */
rc = app_getattr (card, ctrl, keyword);
if (direct)
card_unref (card);
}
else
rc = gpg_error (GPG_ERR_NO_SECKEY);
return rc;
}