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scd: One new and one improved 7816 function.

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* scd/apdu.c (apdu_send_direct): New arg R_SW.
* scd/command.c (cmd_apdu): Ditto.
* scd/iso7816.c (iso7816_apdu_direct): New arg R_SW.
(iso7816_general_authenticate): New.
* scd/app-nks.c (get_chv_status, get_nks_version): Pass NULL for new
arg.
--

iso7816_general_authenticate will be used for the PIV card support.
The new arg to iso7816_apdu_direct and apdu_send_direct allows to get
the raw status word back without the need to handle an output buffer.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2019-01-20 11:41:23 +01:00
parent d93797c8a7
commit 70bb5c7931
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
6 changed files with 90 additions and 27 deletions
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30
scd/apdu.c
View File

@ -3063,19 +3063,25 @@ apdu_send_simple (int slot, int extended_mode,
/* This is a more generic version of the apdu sending routine. It
takes an already formatted APDU in APDUDATA or length APDUDATALEN
and returns with an APDU including the status word. With
HANDLE_MORE set to true this function will handle the MORE DATA
status and return all APDUs concatenated with one status word at
the end. If EXTENDED_LENGTH is != 0 extended lengths are allowed
with a max. result data length of EXTENDED_LENGTH bytes. The
function does not return a regular status word but 0 on success.
If the slot is locked, the function returns immediately with an
error. */
* takes an already formatted APDU in APDUDATA or length APDUDATALEN
* and returns with an APDU including the status word. With
* HANDLE_MORE set to true this function will handle the MORE DATA
* status and return all APDUs concatenated with one status word at
* the end. If EXTENDED_LENGTH is != 0 extended lengths are allowed
* with a max. result data length of EXTENDED_LENGTH bytes. The
* function does not return a regular status word but 0 on success.
* If the slot is locked, the function returns immediately with an
* error.
*
* Out of historical reasons the function returns 0 on success and
* outs the status word at the end of the result to be able to get the
* status word in the case of a not provided RETBUF, R_SW can be used
* to store the SW. But note that R_SW qill only be set if the
* function returns 0. */
int
apdu_send_direct (int slot, size_t extended_length,
const unsigned char *apdudata, size_t apdudatalen,
int handle_more,
int handle_more, unsigned int *r_sw,
unsigned char **retbuf, size_t *retbuflen)
{
#define SHORT_RESULT_BUFFER_SIZE 258
@ -3282,9 +3288,13 @@ apdu_send_direct (int slot, size_t extended_length,
(*retbuf)[(*retbuflen)++] = sw;
}
if (r_sw)
*r_sw = sw;
if (DBG_CARD_IO && retbuf)
log_printhex (*retbuf, *retbuflen, " dump: ");
return 0;
}

2
scd/apdu.h
View File

@ -138,7 +138,7 @@ int apdu_send_le (int slot, int extended_mode,
unsigned char **retbuf, size_t *retbuflen);
int apdu_send_direct (int slot, size_t extended_length,
const unsigned char *apdudata, size_t apdudatalen,
int handle_more,
int handle_more, unsigned int *r_sw,
unsigned char **retbuf, size_t *retbuflen);
const char *apdu_get_reader_name (int slot);

4
scd/app-nks.c
View File

@ -273,7 +273,7 @@ get_chv_status (app_t app, int sigg, int pwid)
command[3] = pwid;
if (apdu_send_direct (app->slot, 0, (unsigned char *)command,
4, 0, &result, &resultlen))
4, 0, NULL, &result, &resultlen))
rc = -1; /* Error. */
else if (resultlen < 2)
rc = -1; /* Error. */
@ -1300,7 +1300,7 @@ get_nks_version (int slot)
int type;
if (iso7816_apdu_direct (slot, "\x80\xaa\x06\x00\x00", 5, 0,
&result, &resultlen))
NULL, &result, &resultlen))
return 2; /* NKS 2 does not support this command. */
/* Example value: 04 11 19 22 21 6A 20 80 03 03 01 01 01 00 00 00

5
scd/command.c
View File

@ -333,7 +333,7 @@ static const char hlp_learn[] =
"or a \"CANCEL\" to force the function to terminate with a Cancel\n"
"error message.\n"
"\n"
"With the option --keypairinfo only KEYPARIINFO lstatus lines are\n"
"With the option --keypairinfo only KEYPARIINFO status lines are\n"
"returned.\n"
"\n"
"The response of this command is a list of status lines formatted as\n"
@ -346,6 +346,7 @@ static const char hlp_learn[] =
" P15 = PKCS-15 structure used\n"
" DINSIG = DIN SIG\n"
" OPENPGP = OpenPGP card\n"
" PIV = PIV card\n"
" NKS = NetKey card\n"
"\n"
"are implemented. These strings are aliases for the AID\n"
@ -1663,7 +1664,7 @@ cmd_apdu (assuan_context_t ctx, char *line)
rc = apdu_send_direct (app->slot, exlen,
apdu, apdulen, handle_more,
&result, &resultlen);
NULL, &result, &resultlen);
if (rc)
log_error ("apdu_send_direct failed: %s\n", gpg_strerror (rc));
else

67
scd/iso7816.c
View File

@ -50,6 +50,7 @@
#define CMD_PUT_DATA 0xDA
#define CMD_MSE 0x22
#define CMD_PSO 0x2A
#define CMD_GENERAL_AUTHENTICATE 0x87
#define CMD_INTERNAL_AUTHENTICATE 0x88
#define CMD_GENERATE_KEYPAIR 0x47
#define CMD_GET_CHALLENGE 0x84
@ -225,24 +226,28 @@ iso7816_list_directory (int slot, int list_dirs,
internally. The return value is a gpg error code (i.e. a mapped
status word). This is basically the same as apdu_send_direct but
it maps the status word and does not return it in the result
buffer. */
buffer. However, it R_SW is not NULL the status word is stored
R_SW for closer inspection. */
gpg_error_t
iso7816_apdu_direct (int slot, const void *apdudata, size_t apdudatalen,
int handle_more,
int handle_more, unsigned int *r_sw,
unsigned char **result, size_t *resultlen)
{
int sw;
int sw, sw2;
if (!result || !resultlen)
return gpg_error (GPG_ERR_INV_VALUE);
*result = NULL;
*resultlen = 0;
if (result)
{
*result = NULL;
*resultlen = 0;
}
sw = apdu_send_direct (slot, 0, apdudata, apdudatalen, handle_more,
result, resultlen);
&sw2, result, resultlen);
if (!sw)
{
if (*resultlen < 2)
if (!result)
sw = sw2;
else if (*resultlen < 2)
sw = SW_HOST_GENERAL_ERROR;
else
{
@ -251,13 +256,15 @@ iso7816_apdu_direct (int slot, const void *apdudata, size_t apdudatalen,
(*resultlen)--;
}
}
if (sw != SW_SUCCESS)
if (sw != SW_SUCCESS && result)
{
/* Make sure that pending buffers are released. */
xfree (*result);
*result = NULL;
*resultlen = 0;
}
if (r_sw)
*r_sw = sw;
return map_sw (sw);
}
@ -621,7 +628,7 @@ iso7816_decipher (int slot, int extended_mode,
}
/* For LE see do_generate_keypair. */
/* For LE see do_generate_keypair. */
gpg_error_t
iso7816_internal_authenticate (int slot, int extended_mode,
const unsigned char *data, size_t datalen,
@ -658,6 +665,44 @@ iso7816_internal_authenticate (int slot, int extended_mode,
}
/* For LE see do_generate_keypair. */
gpg_error_t
iso7816_general_authenticate (int slot, int extended_mode,
int algoref, int keyref,
const unsigned char *data, size_t datalen,
int le,
unsigned char **result, size_t *resultlen)
{
int sw;
if (!data || !datalen || !result || !resultlen)
return gpg_error (GPG_ERR_INV_VALUE);
*result = NULL;
*resultlen = 0;
if (!extended_mode)
le = 256; /* Ignore provided Le and use what apdu_send uses. */
else if (le >= 0 && le < 256)
le = 256;
sw = apdu_send_le (slot, extended_mode,
0x00, CMD_GENERAL_AUTHENTICATE, algoref, keyref,
datalen, (const char*)data,
le,
result, resultlen);
if (sw != SW_SUCCESS)
{
/* Make sure that pending buffers are released. */
xfree (*result);
*result = NULL;
*resultlen = 0;
return map_sw (sw);
}
return 0;
}
/* LE is the expected return length. This is usually 0 except if
extended length mode is used and more than 256 byte will be
returned. In that case a value of -1 uses a large default

9
scd/iso7816.h
View File

@ -63,7 +63,7 @@ gpg_error_t iso7816_list_directory (int slot, int list_dirs,
unsigned char **result, size_t *resultlen);
gpg_error_t iso7816_apdu_direct (int slot,
const void *apdudata, size_t apdudatalen,
int handle_more,
int handle_more, unsigned int *r_sw,
unsigned char **result, size_t *resultlen);
gpg_error_t iso7816_check_pinpad (int slot, int command,
pininfo_t *pininfo);
@ -104,6 +104,13 @@ gpg_error_t iso7816_internal_authenticate (int slot, int extended_mode,
const unsigned char *data, size_t datalen,
int le,
unsigned char **result, size_t *resultlen);
gpg_error_t iso7816_general_authenticate (int slot, int extended_mode,
int algoref, int keyref,
const unsigned char *data,
size_t datalen,
int le,
unsigned char **result,
size_t *resultlen);
gpg_error_t iso7816_generate_keypair (int slot, int extended_mode,
const char *data, size_t datalen,
int le,