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opensc/src/libopensc/pkcs15-cac.c

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/*
* partial PKCS15 emulation for CAC-II cards
* only minimal use of the authentication cert and key
*
* Copyright (C) 2005,2006,2007,2008,2009,2010
* Douglas E. Engert <deengert@anl.gov>
* 2004, Nils Larsch <larsch@trustcenter.de>
* Copyright (C) 2006, Identity Alliance,
* Thomas Harning <thomas.harning@identityalliance.com>
* Copyright (C) 2007, EMC, Russell Larner <rlarner@rsa.com>
* Copyright (C) 2016, Red Hat, Inc.
*
* CAC driver author: Robert Relyea <rrelyea@redhat.com>
*
* 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
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include "internal.h"
#include "cardctl.h"
#include "pkcs15.h"
/* X509 Key Usage flags */
#include "../pkcs15init/pkcs15-init.h"
/* probably should get manufacturer ID from cuid */
#define MANU_ID "Common Access Card"
typedef struct pdata_st {
const char *id;
const char *label;
const char *path;
int ref;
int type;
unsigned int maxlen;
unsigned int minlen;
unsigned int storedlen;
int flags;
int tries_left;
const unsigned char pad_char;
int obj_flags;
} pindata;
static int cac_detect_card(sc_pkcs15_card_t *p15card)
{
sc_card_t *card = p15card->card;
SC_FUNC_CALLED(card->ctx, SC_LOG_DEBUG_VERBOSE);
if (card->type < SC_CARD_TYPE_CAC_GENERIC
|| card->type >= SC_CARD_TYPE_CAC_GENERIC+1000)
return SC_ERROR_INVALID_CARD;
return SC_SUCCESS;
}
#define CAC_NUM_CERTS_AND_KEYS 10
static const char * cac_get_name(int type)
{
switch (type) {
case SC_CARD_TYPE_CAC_I: return ("CAC I");
case SC_CARD_TYPE_CAC_II: return ("CAC II");
case SC_CARD_TYPE_CAC_ALT_HID: return ("CAC ALT HID");
default: break;
}
return ("CAC");
}
static int sc_pkcs15emu_cac_init(sc_pkcs15_card_t *p15card)
{
static const pindata pins[] = {
{ "1", "PIN", "", 0x00,
SC_PKCS15_PIN_TYPE_ASCII_NUMERIC,
8, 4, 8,
SC_PKCS15_PIN_FLAG_NEEDS_PADDING |
SC_PKCS15_PIN_FLAG_INITIALIZED ,
-1, 0xFF,
SC_PKCS15_CO_FLAG_PRIVATE },
{ NULL, NULL, NULL, 0, 0, 0, 0, 0, 0, 0, 0, 0}
};
/* oid for key usage */
static const struct sc_object_id usage_type = {{ 2, 5, 29, 15, -1 }};
unsigned int usage;
/*
* The size of the key or the algid is not really known
* but can be derived from the certificates.
* the cert, pubkey and privkey are a set.
* Key usages bits taken from certificate key usage extension.
*/
int r, i;
sc_card_t *card = p15card->card;
sc_serial_number_t serial;
char buf[SC_MAX_SERIALNR * 2 + 1];
int count;
char *token_name = NULL;
SC_FUNC_CALLED(card->ctx, SC_LOG_DEBUG_VERBOSE);
memset(&serial, 0, sizeof(serial));
/* could read this off card if needed */
set_string(&p15card->tokeninfo->label, cac_get_name(card->type));
set_string(&p15card->tokeninfo->manufacturer_id, MANU_ID);
/*
* get serial number
*/
r = sc_card_ctl(card, SC_CARDCTL_GET_SERIALNR, &serial);
if (r < 0) {
sc_log(card->ctx, "sc_card_ctl rc=%d",r);
set_string(&p15card->tokeninfo->serial_number, "00000000");
} else {
sc_bin_to_hex(serial.value, serial.len, buf, sizeof(buf), 0);
set_string(&p15card->tokeninfo->serial_number, buf);
}
/* set pins */
/* TODO we should not create PIN objects if it is not initialized
* (opensc-tool -s 0020000000 returns 0x6A 0x88)
*/
sc_log(card->ctx, "CAC adding pins...");
for (i = 0; pins[i].id; i++) {
struct sc_pkcs15_auth_info pin_info;
struct sc_pkcs15_object pin_obj;
const char * label;
memset(&pin_info, 0, sizeof(pin_info));
memset(&pin_obj, 0, sizeof(pin_obj));
pin_info.auth_type = SC_PKCS15_PIN_AUTH_TYPE_PIN;
sc_pkcs15_format_id(pins[i].id, &pin_info.auth_id);
pin_info.attrs.pin.reference = pins[i].ref;
pin_info.attrs.pin.flags = pins[i].flags;
pin_info.attrs.pin.type = pins[i].type;
pin_info.attrs.pin.min_length = pins[i].minlen;
pin_info.attrs.pin.stored_length = pins[i].storedlen;
pin_info.attrs.pin.max_length = pins[i].maxlen;
pin_info.attrs.pin.pad_char = pins[i].pad_char;
sc_format_path(pins[i].path, &pin_info.path);
pin_info.tries_left = -1;
label = pins[i].label;
sc_log(card->ctx, "CAC Adding pin %d label=%s",i, label);
strncpy(pin_obj.label, label, SC_PKCS15_MAX_LABEL_SIZE - 1);
pin_obj.flags = pins[i].obj_flags;
/* get the ACA path in case it needs to be selected before PIN verify */
r = sc_card_ctl(card, SC_CARDCTL_CAC_GET_ACA_PATH, &pin_info.path);
if (r < 0) {
LOG_FUNC_RETURN(card->ctx, r);
}
r = sc_pkcs15emu_add_pin_obj(p15card, &pin_obj, &pin_info);
if (r < 0)
LOG_FUNC_RETURN(card->ctx, r);
}
/* set other objects */
r = (card->ops->card_ctl)(card, SC_CARDCTL_CAC_INIT_GET_GENERIC_OBJECTS, &count);
LOG_TEST_RET(card->ctx, r, "Can not initiate generic objects.");
for (i = 0; i < count; i++) {
struct sc_pkcs15_data_info obj_info;
struct sc_pkcs15_object obj_obj;
r = (card->ops->card_ctl)(card, SC_CARDCTL_CAC_GET_NEXT_GENERIC_OBJECT, &obj_info);
if (r < 0)
LOG_FUNC_RETURN(card->ctx, r);
memset(&obj_obj, 0, sizeof(obj_obj));
memcpy(obj_obj.label, obj_info.app_label, sizeof(obj_obj.label));
r = sc_pkcs15emu_object_add(p15card, SC_PKCS15_TYPE_DATA_OBJECT,
&obj_obj, &obj_info);
if (r < 0)
LOG_FUNC_RETURN(card->ctx, r);
}
r = (card->ops->card_ctl)(card, SC_CARDCTL_CAC_FINAL_GET_GENERIC_OBJECTS, &count);
LOG_TEST_RET(card->ctx, r, "Can not finalize generic objects.");
/*
* certs, pubkeys and priv keys are related and we assume
* they are in order
* We need to read the cert, get modulus and keylen
* We use those for the pubkey, and priv key objects.
*/
sc_log(card->ctx, "CAC adding certs, pub and priv keys...");
r = (card->ops->card_ctl)(card, SC_CARDCTL_CAC_INIT_GET_CERT_OBJECTS, &count);
LOG_TEST_RET(card->ctx, r, "Can not initiate cert objects.");
for (i = 0; i < count; i++) {
struct sc_pkcs15_data_info obj_info;
struct sc_pkcs15_cert_info cert_info;
struct sc_pkcs15_pubkey_info pubkey_info;
struct sc_pkcs15_prkey_info prkey_info;
struct sc_pkcs15_object cert_obj;
struct sc_pkcs15_object pubkey_obj;
struct sc_pkcs15_object prkey_obj;
sc_pkcs15_der_t cert_der;
sc_pkcs15_cert_t *cert_out = NULL;
r = (card->ops->card_ctl)(card, SC_CARDCTL_CAC_GET_NEXT_CERT_OBJECT, &obj_info);
LOG_TEST_RET(card->ctx, r, "Can not get next object");
memset(&cert_info, 0, sizeof(cert_info));
memset(&pubkey_info, 0, sizeof(pubkey_info));
memset(&prkey_info, 0, sizeof(prkey_info));
memset(&cert_obj, 0, sizeof(cert_obj));
memset(&pubkey_obj, 0, sizeof(pubkey_obj));
memset(&prkey_obj, 0, sizeof(prkey_obj));
cert_info.id = obj_info.id;
pubkey_info.id = obj_info.id;
prkey_info.id = obj_info.id;
cert_info.path = obj_info.path;
prkey_info.path = obj_info.path;
/* Add 0x3f00 to the front of prkey_info.path to make sc_key_file happy */
/* only do this if our path.len is 1 or 2 */
if (prkey_info.path.len && prkey_info.path.len <= 2) {
prkey_info.path.value[2] = prkey_info.path.value[0];
prkey_info.path.value[3] = prkey_info.path.value[1];
prkey_info.path.value[0] = 0x3f;
prkey_info.path.value[1] = 0x00;
prkey_info.path.len += 2;
}
pubkey_info.native = 1;
pubkey_info.key_reference = ((int)obj_info.id.value[0]) << 8 | obj_info.id.value[1];
prkey_info.key_reference = ((int)obj_info.id.value[0]) << 8 | obj_info.id.value[1];
prkey_info.native = 1;
memcpy(cert_obj.label, obj_info.app_label, sizeof(obj_info.app_label));
memcpy(pubkey_obj.label, obj_info.app_label, sizeof(obj_info.app_label));
memcpy(prkey_obj.label, obj_info.app_label, sizeof(obj_info.app_label));
prkey_obj.flags = SC_PKCS15_CO_FLAG_PRIVATE;
sc_pkcs15_format_id(pins[0].id, &prkey_obj.auth_id);
r = sc_pkcs15_read_file(p15card, &cert_info.path, &cert_der.value, &cert_der.len);
if (r) {
sc_log(card->ctx, "No cert found,i=%d", i);
continue;
}
cert_info.path.count = cert_der.len;
sc_log(card->ctx,
"cert len=%"SC_FORMAT_LEN_SIZE_T"u, cert_info.path.count=%d r=%d\n",
cert_der.len, cert_info.path.count, r);
sc_log_hex(card->ctx, "cert", cert_der.value, cert_der.len);
/* cache it using the PKCS15 emulation objects */
/* as it does not change */
if (cert_der.value) {
cert_info.value.value = cert_der.value;
cert_info.value.len = cert_der.len;
cert_info.path.len = 0; /* use in mem cert from now on */
}
/* following will find the cached cert in cert_info */
r = sc_pkcs15_read_certificate(p15card, &cert_info, &cert_out);
if (r < 0 || cert_out->key == NULL) {
sc_log(card->ctx, "Failed to read/parse the certificate r=%d",r);
if (cert_out != NULL)
sc_pkcs15_free_certificate(cert_out);
free(cert_info.value.value);
continue;
}
r = sc_pkcs15emu_add_x509_cert(p15card, &cert_obj, &cert_info);
if (r < 0) {
sc_log(card->ctx, " Failed to add cert obj r=%d",r);
sc_pkcs15_free_certificate(cert_out);
free(cert_info.value.value);
continue;
}
/* set the token name to the name of the CN of the first certificate */
if (!token_name) {
u8 * cn_name = NULL;
size_t cn_len = 0;
static const struct sc_object_id cn_oid = {{ 2, 5, 4, 3, -1 }};
r = sc_pkcs15_get_name_from_dn(card->ctx, cert_out->subject,
cert_out->subject_len, &cn_oid, &cn_name, &cn_len);
if (r == SC_SUCCESS) {
token_name = malloc (cn_len+1);
if (!token_name) {
free(cn_name);
r = SC_ERROR_OUT_OF_MEMORY;
goto fail;
}
memcpy(token_name, cn_name, cn_len);
free(cn_name);
token_name[cn_len] = 0;
free(p15card->tokeninfo->label);
p15card->tokeninfo->label = token_name;
}
}
r = sc_pkcs15_encode_pubkey_as_spki(card->ctx, cert_out->key, &pubkey_info.direct.spki.value, &pubkey_info.direct.spki.len);
if (r < 0)
goto fail;
pubkey_obj.emulated = cert_out->key;
r = sc_pkcs15_get_bitstring_extension(card->ctx, cert_out, &usage_type, &usage, NULL);
if (r < 0) {
usage = SC_X509_DATA_ENCIPHERMENT|SC_X509_DIGITAL_SIGNATURE; /* basic default usage */
}
sc_pkcs15_map_usage(usage, cert_out->key->algorithm, &pubkey_info.usage, &prkey_info.usage, 1);
sc_log(card->ctx, "cert %s: cert_usage=0x%x, pub_usage=0x%x priv_usage=0x%x\n",
sc_dump_hex(cert_info.id.value, cert_info.id.len),
usage, pubkey_info.usage, prkey_info.usage);
if (cert_out->key->algorithm != SC_ALGORITHM_RSA) {
sc_log(card->ctx, "unsupported key.algorithm %d", cert_out->key->algorithm);
sc_pkcs15_free_certificate(cert_out);
continue;
} else {
pubkey_info.modulus_length = cert_out->key->u.rsa.modulus.len * 8;
prkey_info.modulus_length = cert_out->key->u.rsa.modulus.len * 8;
r = sc_pkcs15emu_add_rsa_pubkey(p15card, &pubkey_obj, &pubkey_info);
sc_log(card->ctx, "adding rsa public key r=%d usage=%x",r, pubkey_info.usage);
if (r < 0)
goto fail;
r = sc_pkcs15emu_add_rsa_prkey(p15card, &prkey_obj, &prkey_info);
sc_log(card->ctx, "adding rsa private key r=%d usage=%x",r, prkey_info.usage);
}
cert_out->key = NULL;
fail:
sc_pkcs15_free_certificate(cert_out);
if (r < 0)
LOG_FUNC_RETURN(card->ctx, r); /* should not fail */
}
r = (card->ops->card_ctl)(card, SC_CARDCTL_CAC_FINAL_GET_CERT_OBJECTS, &count);
LOG_TEST_RET(card->ctx, r, "Can not finalize cert objects.");
LOG_FUNC_RETURN(card->ctx, SC_SUCCESS);
}
int sc_pkcs15emu_cac_init_ex(sc_pkcs15_card_t *p15card,
struct sc_aid *aid)
{
sc_card_t *card = p15card->card;
sc_context_t *ctx = card->ctx;
LOG_FUNC_CALLED(ctx);
if (cac_detect_card(p15card))
return SC_ERROR_WRONG_CARD;
return sc_pkcs15emu_cac_init(p15card);
}
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