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opensc/src/libopensc/card-openpgp.c

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/*
* card-openpgp.c: Support for OpenPGP card
*
* Copyright (C) 2003 Olaf Kirch <okir@suse.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Specifications:
* http://www.g10code.de/docs/openpgp-card-1.1.pdf
* http://www.g10code.de/docs/openpgp-card-2.0.pdf
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "internal.h"
#include "asn1.h"
#include "cardctl.h"
static struct sc_atr_table pgp_atrs[] = {
{ "3b:fa:13:00:ff:81:31:80:45:00:31:c1:73:c0:01:00:00:90:00:b1", NULL, "OpenPGP card v1.0/1.1", SC_CARD_TYPE_OPENPGP_V1, 0, NULL },
{ "3b:da:18:ff:81:b1:fe:75:1f:03:00:31:c5:73:c0:01:40:00:90:00:0c", NULL, "CryptoStick v1.2 (OpenPGP v2.0)", SC_CARD_TYPE_OPENPGP_V2, 0, NULL },
{ NULL, NULL, NULL, 0, 0, NULL }
};
static struct sc_card_operations *iso_ops;
static struct sc_card_operations pgp_ops;
static struct sc_card_driver pgp_drv = {
"OpenPGP card",
"openpgp",
&pgp_ops,
NULL, 0, NULL
};
/*
* The OpenPGP card doesn't have a file system, instead everything
* is stored in data objects that are accessed through GET/PUT.
*
* However, much inside OpenSC's pkcs15 implementation is based on
* the assumption that we have a file system. So we fake one here.
*
* Selecting the MF causes us to select the OpenPGP AID.
*
* Everything else is mapped to "file" IDs.
*/
struct blob {
struct blob * next;
struct blob * parent;
struct do_info *info;
sc_file_t * file;
unsigned int id;
int status;
unsigned char * data;
unsigned int len;
struct blob * files;
};
struct do_info {
unsigned int id;
unsigned int constructed : 1;
unsigned int size;
int (*get_fn)(sc_card_t *, unsigned int, u8 *, size_t);
int (*put_fn)(sc_card_t *, unsigned int, const u8 *, size_t);
};
static struct blob * pgp_new_blob(struct blob *, unsigned int, int,
struct do_info *);
static int pgp_get_pubkey(sc_card_t *, unsigned int,
u8 *, size_t);
static int pgp_get_pubkey_pem(sc_card_t *, unsigned int,
u8 *, size_t);
static struct do_info pgp_objects[] = {
{ 0x004f, 0, 0, sc_get_data, sc_put_data },
{ 0x005e, 1, 0, sc_get_data, sc_put_data },
{ 0x0065, 1, 0, sc_get_data, sc_put_data },
{ 0x006e, 1, 0, sc_get_data, sc_put_data },
{ 0x0073, 1, 0, sc_get_data, sc_put_data },
{ 0x007a, 1, 0, sc_get_data, sc_put_data },
{ 0x5f50, 0, 0, sc_get_data, sc_put_data },
{ 0xb600, 1, 0, pgp_get_pubkey, NULL },
{ 0xb800, 1, 0, pgp_get_pubkey, NULL },
{ 0xa400, 1, 0, pgp_get_pubkey, NULL },
{ 0xb601, 0, 0, pgp_get_pubkey_pem,NULL },
{ 0xb801, 0, 0, pgp_get_pubkey_pem,NULL },
{ 0xa401, 0, 0, pgp_get_pubkey_pem,NULL },
{ 0, 0, 0, NULL, NULL },
};
#define DRVDATA(card) ((struct pgp_priv_data *) ((card)->drv_data))
struct pgp_priv_data {
struct blob mf;
struct blob * current;
sc_security_env_t sec_env;
};
static int
pgp_match_card(sc_card_t *card)
{
int i;
i = _sc_match_atr(card, pgp_atrs, &card->type);
if (i >= 0) {
card->name = pgp_atrs[i].name;
return 1;
}
return 0;
}
static int
pgp_init(sc_card_t *card)
{
struct pgp_priv_data *priv;
unsigned long flags;
sc_path_t aid;
sc_file_t *file = NULL;
struct do_info *info;
int r;
priv = calloc (1, sizeof *priv);
if (!priv)
return SC_ERROR_OUT_OF_MEMORY;
card->drv_data = priv;
card->cla = 0x00;
/* Is this correct? */
flags = SC_ALGORITHM_RSA_RAW;
flags |= SC_ALGORITHM_RSA_PAD_PKCS1;
flags |= SC_ALGORITHM_RSA_HASH_NONE;
/* Is this correct? */
_sc_card_add_rsa_alg(card, 512, flags, 0);
_sc_card_add_rsa_alg(card, 768, flags, 0);
_sc_card_add_rsa_alg(card, 1024, flags, 0);
sc_format_path("D276:0001:2401", &aid);
aid.type = SC_PATH_TYPE_DF_NAME;
if ((r = iso_ops->select_file(card, &aid, &file)) < 0)
return r;
sc_format_path("3f00", &file->path);
file->type = SC_FILE_TYPE_DF;
file->id = 0x3f00;
priv->mf.file = file;
priv->mf.id = 0x3F00;
priv->current = &priv->mf;
/* Populate MF - add all blobs listed in the pgp_objects
* table. */
for (info = pgp_objects; info->id > 0; info++) {
pgp_new_blob(&priv->mf, info->id,
info->constructed? SC_FILE_TYPE_DF
: SC_FILE_TYPE_WORKING_EF,
info);
}
return 0;
}
static int
pgp_finish(sc_card_t *card)
{
struct pgp_priv_data *priv;
if (card == NULL)
return 0;
priv = DRVDATA (card);
/* XXX delete fake file hierarchy */
free(priv);
return 0;
}
static int
pgp_set_blob(struct blob *blob, const u8 *data, size_t len)
{
if (blob->data)
free(blob->data);
blob->len = len;
blob->status = 0;
blob->data = malloc(len);
memcpy(blob->data, data, len);
blob->file->size = len;
return 0;
}
static struct blob *
pgp_new_blob(struct blob *parent, unsigned int file_id,
int file_type, struct do_info *info)
{
sc_file_t *file = sc_file_new();
struct blob *blob, **p;
blob = calloc(1, sizeof(*blob));
blob->parent = parent;
blob->id = file_id;
blob->file = file;
blob->info = info;
file->type = file_type;
file->path = parent->file->path;
file->ef_structure = SC_FILE_EF_TRANSPARENT;
sc_append_file_id(&file->path, file_id);
for (p = &parent->files; *p; p = &(*p)->next)
;
*p = blob;
return blob;
}
static int
pgp_read_blob(sc_card_t *card, struct blob *blob)
{
unsigned char buffer[256];
int r;
if (blob->data != NULL)
return 0;
if (blob->info == NULL)
return blob->status;
r = blob->info->get_fn(card, blob->id, buffer, sizeof(buffer));
if (r < 0) {
blob->status = r;
return r;
}
return pgp_set_blob(blob, buffer, r);
}
/*
* Enumerate contents of a data blob.
* The OpenPGP card has a funny TLV encoding.
*/
static int
pgp_enumerate_blob(sc_card_t *card, struct blob *blob)
{
const u8 *in, *end;
int r;
if (blob->files != NULL)
return 0;
if ((r = pgp_read_blob(card, blob)) < 0)
return r;
in = blob->data;
end = blob->data + blob->len;
while (in < end) {
unsigned int tag, len, type = SC_FILE_TYPE_WORKING_EF;
unsigned char c;
c = *in++;
if (c == 0x00 || c == 0xFF)
continue;
tag = c;
if (tag & 0x20)
type = SC_FILE_TYPE_DF;
while ((c & 0x1f) == 0x1f) {
if (in >= end)
goto eoc;
c = *in++;
tag = (tag << 8) | c;
}
if (in >= end)
goto eoc;
c = *in++;
if (c < 0x80) {
len = c;
} else {
len = 0;
c &= 0x7F;
while (c--) {
if (in >= end)
goto eoc;
len = (len << 8) | *in++;
}
}
/* Don't search past end of content */
if (in + len > end)
goto eoc;
pgp_set_blob(pgp_new_blob(blob, tag, type, NULL), in, len);
in += len;
}
return 0;
eoc: sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL, "Unexpected end of contents\n");
return SC_ERROR_OBJECT_NOT_VALID;
}
static int
pgp_get_blob(sc_card_t *card, struct blob *blob, unsigned int id,
struct blob **ret)
{
struct blob *child;
int r;
if ((r = pgp_enumerate_blob(card, blob)) < 0)
return r;
for (child = blob->files; child; child = child->next) {
if (child->id == id)
break;
}
if (child != NULL) {
(void) pgp_read_blob(card, child);
*ret = child;
return 0;
}
return SC_ERROR_FILE_NOT_FOUND;
}
static int
pgp_select_file(sc_card_t *card, const sc_path_t *path, sc_file_t **ret)
{
struct pgp_priv_data *priv = DRVDATA(card);
struct blob *blob;
sc_path_t path_copy;
unsigned int n;
int r;
memset(&path_copy, 0, sizeof(path_copy));
if (path->type == SC_PATH_TYPE_DF_NAME)
return iso_ops->select_file(card, path, ret);
if (path->type != SC_PATH_TYPE_PATH)
return SC_ERROR_INVALID_ARGUMENTS;
if (path->len < 2 || (path->len & 1))
return SC_ERROR_INVALID_ARGUMENTS;
if (!memcmp(path->value, "\x3f\x00", 2)) {
memcpy(path_copy.value, path->value + 2, path->len - 2);
path_copy.len = path->len - 2;
path = &path_copy;
}
blob = &priv->mf;
for (n = 0; n < path->len; n += 2) {
r = pgp_get_blob(card, blob,
(path->value[n] << 8) | path->value[n+1],
&blob);
if (r < 0) {
priv->current = NULL;
return r;
}
}
priv->current = blob;
if (ret)
sc_file_dup(ret, blob->file);
return 0;
}
static int
pgp_list_files(sc_card_t *card, u8 *buf, size_t buflen)
{
struct pgp_priv_data *priv = DRVDATA(card);
struct blob *blob;
unsigned int k;
int r;
blob = priv->current;
if (blob->file->type != SC_FILE_TYPE_DF)
return SC_ERROR_OBJECT_NOT_VALID;
if ((r = pgp_enumerate_blob(card, blob)) < 0)
return r;
for (k = 0, blob = blob->files; blob; blob = blob->next) {
if (k + 2 > buflen)
break;
buf[k++] = blob->id >> 8;
buf[k++] = blob->id;
}
return k;
}
static int
pgp_read_binary(sc_card_t *card, unsigned int idx,
u8 *buf, size_t count, unsigned long flags)
{
struct pgp_priv_data *priv = DRVDATA(card);
struct blob *blob;
int r;
if ((blob = priv->current) == NULL)
return SC_ERROR_FILE_NOT_FOUND;
if (blob->file->type != SC_FILE_TYPE_WORKING_EF)
return SC_ERROR_FILE_NOT_FOUND;
if ((r = pgp_read_blob(card, blob)) < 0)
return r;
if (idx > blob->len)
return SC_ERROR_INCORRECT_PARAMETERS;
if (idx + count > blob->len)
count = blob->len - idx;
memcpy(buf, blob->data + idx, count);
return count;
}
static int
pgp_write_binary(sc_card_t *card, unsigned int idx,
const u8 *buf, size_t count, unsigned long flags)
{
return SC_ERROR_NOT_SUPPORTED;
}
static int
pgp_get_pubkey(sc_card_t *card, unsigned int tag, u8 *buf, size_t buf_len)
{
sc_apdu_t apdu;
u8 idbuf[2];
int r;
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL, "called, tag=%04x\n", tag);
idbuf[0] = tag >> 8;
idbuf[1] = tag;
sc_format_apdu(card, &apdu, SC_APDU_CASE_4_SHORT, 0x47, 0x81, 0);
apdu.lc = 2;
apdu.data = idbuf;
apdu.datalen = 2;
apdu.le = (buf_len > 256)? 256 : buf_len;
apdu.resp = buf;
apdu.resplen = buf_len;
r = sc_transmit_apdu(card, &apdu);
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, r, "APDU transmit failed");
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, r, "Card returned error");
return apdu.resplen;
}
static int
pgp_get_pubkey_pem(sc_card_t *card, unsigned int tag, u8 *buf, size_t buf_len)
{
struct pgp_priv_data *priv = DRVDATA(card);
struct blob *blob, *mod_blob, *exp_blob;
sc_pkcs15_pubkey_t pubkey;
u8 *data;
size_t len;
int r;
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL, "called, tag=%04x\n", tag);
if ((r = pgp_get_blob(card, &priv->mf, tag & 0xFFFE, &blob)) < 0
|| (r = pgp_get_blob(card, blob, 0x7F49, &blob)) < 0
|| (r = pgp_get_blob(card, blob, 0x0081, &mod_blob)) < 0
|| (r = pgp_get_blob(card, blob, 0x0082, &exp_blob)) < 0
|| (r = pgp_read_blob(card, mod_blob)) < 0
|| (r = pgp_read_blob(card, exp_blob)) < 0)
return r;
memset(&pubkey, 0, sizeof(pubkey));
pubkey.algorithm = SC_ALGORITHM_RSA;
pubkey.u.rsa.modulus.data = mod_blob->data;
pubkey.u.rsa.modulus.len = mod_blob->len;
pubkey.u.rsa.exponent.data = exp_blob->data;
pubkey.u.rsa.exponent.len = exp_blob->len;
if ((r = sc_pkcs15_encode_pubkey(card->ctx, &pubkey, &data, &len)) < 0)
return r;
if (len > buf_len)
len = buf_len;
memcpy(buf, data, len);
free(data);
return len;
}
static int
pgp_get_data(sc_card_t *card, unsigned int tag, u8 *buf, size_t buf_len)
{
sc_apdu_t apdu;
int r;
sc_format_apdu(card, &apdu, SC_APDU_CASE_2_SHORT,
0xCA, tag >> 8, tag);
apdu.le = (buf_len <= 255)? buf_len : 256;
apdu.resp = buf;
apdu.resplen = buf_len;
r = sc_transmit_apdu(card, &apdu);
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, r, "APDU transmit failed");
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, r, "Card returned error");
return apdu.resplen;
}
static int
pgp_put_data(sc_card_t *card, unsigned int tag, const u8 *buf, size_t buf_len)
{
return SC_ERROR_NOT_SUPPORTED;
}
static int
pgp_pin_cmd(sc_card_t *card, struct sc_pin_cmd_data *data, int *tries_left)
{
if (data->pin_type != SC_AC_CHV)
return SC_ERROR_INVALID_ARGUMENTS;
data->pin_reference |= 0x80;
return iso_ops->pin_cmd(card, data, tries_left);
}
static int
pgp_set_security_env(sc_card_t *card,
const sc_security_env_t *env, int se_num)
{
struct pgp_priv_data *priv = DRVDATA(card);
if (env->flags & SC_SEC_ENV_ALG_PRESENT) {
if (env->algorithm != SC_ALGORITHM_RSA)
return SC_ERROR_INVALID_ARGUMENTS;
}
if (!(env->flags & SC_SEC_ENV_KEY_REF_PRESENT)
|| env->key_ref_len != 1)
return SC_ERROR_INVALID_ARGUMENTS;
if (env->flags & SC_SEC_ENV_FILE_REF_PRESENT)
return SC_ERROR_INVALID_ARGUMENTS;
switch (env->operation) {
case SC_SEC_OPERATION_SIGN:
if (env->key_ref[0] != 0x00
&& env->key_ref[0] != 0x02) {
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL,
"Key reference not compatible with "
"requested usage\n");
return SC_ERROR_NOT_SUPPORTED;
}
break;
case SC_SEC_OPERATION_DECIPHER:
if (env->key_ref[0] != 0x01) {
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL,
"Key reference not compatible with "
"requested usage\n");
return SC_ERROR_NOT_SUPPORTED;
}
break;
default:
return SC_ERROR_INVALID_ARGUMENTS;
}
priv->sec_env = *env;
return 0;
}
static int
pgp_compute_signature(sc_card_t *card, const u8 *data,
size_t data_len, u8 * out, size_t outlen)
{
struct pgp_priv_data *priv = DRVDATA(card);
sc_security_env_t *env = &priv->sec_env;
sc_apdu_t apdu;
int r;
if (env->operation != SC_SEC_OPERATION_SIGN)
return SC_ERROR_INVALID_ARGUMENTS;
switch (env->key_ref[0]) {
case 0x00: /* signature key */
/* PSO SIGNATURE */
sc_format_apdu(card, &apdu, SC_APDU_CASE_4_SHORT,
0x2A, 0x9E, 0x9A);
break;
case 0x02: /* authentication key */
/* INTERNAL AUTHENTICATE */
sc_format_apdu(card, &apdu, SC_APDU_CASE_4_SHORT,
0x88, 0, 0);
break;
case 0x01:
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL,
"Invalid key reference (decipher only key)\n");
return SC_ERROR_INVALID_ARGUMENTS;
default:
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL, "Invalid key reference 0x%02x\n",
env->key_ref[0]);
return SC_ERROR_INVALID_ARGUMENTS;
}
apdu.lc = data_len;
apdu.data = data;
apdu.datalen = data_len;
apdu.le = outlen > 256 ? 256 : outlen;
apdu.resp = out;
apdu.resplen = outlen;
r = sc_transmit_apdu(card, &apdu);
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, r, "APDU transmit failed");
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, r, "Card returned error");
return apdu.resplen;
}
static int
pgp_decipher(sc_card_t *card, const u8 *in, size_t inlen,
u8 *out, size_t outlen)
{
struct pgp_priv_data *priv = DRVDATA(card);
sc_security_env_t *env = &priv->sec_env;
sc_apdu_t apdu;
u8 *temp = NULL;
int r;
/* There's some funny padding indicator that must be
* prepended... hmm. */
if (!(temp = malloc(inlen + 1)))
return SC_ERROR_OUT_OF_MEMORY;
temp[0] = '\0';
memcpy(temp + 1, in, inlen);
in = temp;
inlen += 1;
if (env->operation != SC_SEC_OPERATION_DECIPHER) {
free(temp);
return SC_ERROR_INVALID_ARGUMENTS;
}
switch (env->key_ref[0]) {
case 0x01: /* Decryption key */
/* PSO DECIPHER */
sc_format_apdu(card, &apdu, SC_APDU_CASE_4_SHORT,
0x2A, 0x80, 0x86);
break;
case 0x00: /* signature key */
case 0x02: /* authentication key */
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL,
"Invalid key reference (signature only key)\n");
free(temp);
return SC_ERROR_INVALID_ARGUMENTS;
default:
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL, "Invalid key reference 0x%02x\n",
env->key_ref[0]);
free(temp);
return SC_ERROR_INVALID_ARGUMENTS;
}
apdu.lc = inlen;
apdu.data = in;
apdu.datalen = inlen;
apdu.le = 256;
apdu.resp = out;
apdu.resplen = outlen;
r = sc_transmit_apdu(card, &apdu);
free(temp);
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, r, "APDU transmit failed");
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL, r, "Card returned error");
return apdu.resplen;
}
/* Driver binding stuff */
static struct sc_card_driver *
sc_get_driver(void)
{
struct sc_card_driver *iso_drv = sc_get_iso7816_driver();
iso_ops = iso_drv->ops;
pgp_ops = *iso_ops;
pgp_ops.match_card = pgp_match_card;
pgp_ops.init = pgp_init;
pgp_ops.finish = pgp_finish;
pgp_ops.select_file = pgp_select_file;
pgp_ops.list_files = pgp_list_files;
pgp_ops.read_binary = pgp_read_binary;
pgp_ops.write_binary = pgp_write_binary;
pgp_ops.pin_cmd = pgp_pin_cmd;
pgp_ops.get_data = pgp_get_data;
pgp_ops.put_data = pgp_put_data;
pgp_ops.set_security_env= pgp_set_security_env;
pgp_ops.compute_signature= pgp_compute_signature;
pgp_ops.decipher = pgp_decipher;
return &pgp_drv;
}
struct sc_card_driver *
sc_get_openpgp_driver(void)
{
return sc_get_driver();
}
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