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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-1.0.pdf (obsolete)
* 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"
#include "errors.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.
*/
enum _type { /* DO type */
SIMPLE = SC_FILE_TYPE_WORKING_EF,
CONSTRUCTED = SC_FILE_TYPE_DF
};
enum _version { /* 2-byte BCD-alike encoded version number */
OPENPGP_CARD_1_0 = 0x0100,
OPENPGP_CARD_1_1 = 0x0101,
OPENPGP_CARD_2_0 = 0x0200
};
enum _access { /* access flags for the respective DO/file */
READ_NEVER = 0x0010,
READ_PIN1 = 0x0011,
READ_PIN2 = 0x0012,
READ_PIN3 = 0x0014,
READ_ALWAYS = 0x0018,
READ_MASK = 0x00FF,
WRITE_NEVER = 0x1000,
WRITE_PIN1 = 0x1100,
WRITE_PIN2 = 0x1200,
WRITE_PIN3 = 0x1400,
WRITE_ALWAYS = 0x1800,
WRITE_MASK = 0x1F00
};
enum _ext_caps { /* extended capabilities/features */
EXT_CAP_ALG_ATTR_CHANGEABLE = 0x0004,
EXT_CAP_PRIVATE_DO = 0x0008,
EXT_CAP_C4_CHANGEABLE = 0x0010,
EXT_CAP_KEY_IMPORT = 0x0020,
EXT_CAP_GET_CHALLENGE = 0x0040,
EXT_CAP_SM = 0x0080,
EXT_CAP_CHAINING = 0x1000,
EXT_CAP_APDU_EXT = 0x2000
};
enum _card_state {
CARD_STATE_UNKNOWN = 0x00,
CARD_STATE_INITIALIZATION = 0x03,
CARD_STATE_ACTIVATED = 0x05
};
enum _key_type {
KEY_SIGN = 1,
KEY_ENCR = 2,
KEY_AUTH = 3
};
struct blob {
struct blob * next; /* pointer to next sibling */
struct blob * parent; /* pointer to parent */
struct do_info *info;
sc_file_t * file;
unsigned int id;
int status;
unsigned char * data;
unsigned int len;
struct blob * files; /* pointer to 1st child */
};
struct do_info {
unsigned int id; /* ID of the DO in question */
enum _type type; /* constructed DO or not */
enum _access access; /* R/W acces levels for the DO */
/* function to get the DO from the card:
* only != NULL is DO if readable and not only a part of a constructed DO */
int (*get_fn)(sc_card_t *, unsigned int, u8 *, size_t);
/* function to write the DO to the card:
* only != NULL if DO is writeable under some conditions */
int (*put_fn)(sc_card_t *, unsigned int, const u8 *, size_t);
};
static int pgp_get_card_features(sc_card_t *card);
static int pgp_finish(sc_card_t *card);
static void pgp_iterate_blobs(struct blob *, int, void (*func)());
static int pgp_get_blob(sc_card_t *card, struct blob *blob,
unsigned int id, struct blob **ret);
static struct blob * pgp_new_blob(sc_card_t *, struct blob *, unsigned int, sc_file_t *);
static void pgp_free_blob(struct blob *);
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 pgp1_objects[] = { /* OpenPGP card spec 1.1 */
{ 0x004f, SIMPLE, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x005b, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x005e, SIMPLE, READ_ALWAYS | WRITE_PIN3, sc_get_data, sc_put_data },
{ 0x0065, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, sc_get_data, NULL },
{ 0x006e, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, sc_get_data, NULL },
{ 0x0073, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x007a, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, sc_get_data, NULL },
{ 0x0081, SIMPLE, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x0082, SIMPLE, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x0093, SIMPLE, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x00c0, SIMPLE, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x00c1, SIMPLE, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x00c2, SIMPLE, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x00c3, SIMPLE, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x00c4, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x00c5, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x00c6, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x00c7, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00c8, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00c9, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00ca, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00cb, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00cc, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00cd, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x00ce, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00cf, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00d0, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00e0, CONSTRUCTED, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00e1, CONSTRUCTED, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00e2, CONSTRUCTED, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x0101, SIMPLE, READ_ALWAYS | WRITE_PIN2, sc_get_data, sc_put_data },
{ 0x0102, SIMPLE, READ_ALWAYS | WRITE_PIN3, sc_get_data, sc_put_data },
{ 0x0103, SIMPLE, READ_PIN2 | WRITE_PIN2, sc_get_data, sc_put_data },
{ 0x0104, SIMPLE, READ_PIN3 | WRITE_PIN3, sc_get_data, sc_put_data },
{ 0x3f00, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x5f2d, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x5f35, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x5f50, SIMPLE, READ_ALWAYS | WRITE_PIN3, sc_get_data, sc_put_data },
{ 0x7f49, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0xa400, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, pgp_get_pubkey, NULL },
{ 0xa401, SIMPLE, READ_ALWAYS | WRITE_NEVER, pgp_get_pubkey_pem, NULL },
{ 0xb600, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, pgp_get_pubkey, NULL },
{ 0xb601, SIMPLE, READ_ALWAYS | WRITE_NEVER, pgp_get_pubkey_pem, NULL },
{ 0xb800, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, pgp_get_pubkey, NULL },
{ 0xb801, SIMPLE, READ_ALWAYS | WRITE_NEVER, pgp_get_pubkey_pem, NULL },
{ 0, 0, 0, NULL, NULL },
};
static struct do_info pgp2_objects[] = { /* OpenPGP card spec 2.0 */
{ 0x004d, CONSTRUCTED, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x004f, SIMPLE, READ_ALWAYS | WRITE_NEVER, sc_get_data, NULL },
{ 0x005b, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x005e, SIMPLE, READ_ALWAYS | WRITE_PIN3, sc_get_data, sc_put_data },
{ 0x0065, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, sc_get_data, NULL },
{ 0x006e, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, sc_get_data, NULL },
{ 0x0073, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x007a, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, sc_get_data, NULL },
{ 0x0081, SIMPLE, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x0082, SIMPLE, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x0093, SIMPLE, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x00c0, SIMPLE, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x00c1, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x00c2, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x00c3, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x00c4, SIMPLE, READ_ALWAYS | WRITE_PIN3, sc_get_data, sc_put_data },
{ 0x00c5, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x00c6, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x00c7, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00c8, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00c9, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00ca, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00cb, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00cc, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00cd, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x00ce, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00cf, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00d0, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00d1, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00d2, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00d3, SIMPLE, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x00f4, CONSTRUCTED, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x0101, SIMPLE, READ_ALWAYS | WRITE_PIN2, sc_get_data, sc_put_data },
{ 0x0102, SIMPLE, READ_ALWAYS | WRITE_PIN3, sc_get_data, sc_put_data },
{ 0x0103, SIMPLE, READ_PIN2 | WRITE_PIN2, sc_get_data, sc_put_data },
{ 0x0104, SIMPLE, READ_PIN3 | WRITE_PIN3, sc_get_data, sc_put_data },
{ 0x3f00, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0x5f2d, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x5f35, SIMPLE, READ_ALWAYS | WRITE_PIN3, NULL, sc_put_data },
{ 0x5f48, CONSTRUCTED, READ_NEVER | WRITE_PIN3, NULL, sc_put_data },
{ 0x5f50, SIMPLE, READ_ALWAYS | WRITE_PIN3, sc_get_data, sc_put_data },
{ 0x5f52, SIMPLE, READ_ALWAYS | WRITE_NEVER, sc_get_data, NULL },
/* The 7F21 is constructed DO in spec, but in practice, its content can be retrieved
* as simple DO (no need to parse TLV). */
{ 0x7f21, SIMPLE, READ_ALWAYS | WRITE_PIN3, sc_get_data, sc_put_data },
{ 0x7f48, CONSTRUCTED, READ_NEVER | WRITE_NEVER, NULL, NULL },
{ 0x7f49, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, NULL, NULL },
{ 0xa400, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, pgp_get_pubkey, NULL },
{ 0xa401, SIMPLE, READ_ALWAYS | WRITE_NEVER, pgp_get_pubkey_pem, NULL },
{ 0xb600, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, pgp_get_pubkey, NULL },
{ 0xb601, SIMPLE, READ_ALWAYS | WRITE_NEVER, pgp_get_pubkey_pem, NULL },
{ 0xb800, CONSTRUCTED, READ_ALWAYS | WRITE_NEVER, pgp_get_pubkey, NULL },
{ 0xb801, SIMPLE, READ_ALWAYS | WRITE_NEVER, pgp_get_pubkey_pem, NULL },
{ 0, 0, 0, NULL, NULL },
};
/* The DO holding X.509 certificate is constructed but does not contain child DO.
* We should notice this when building fake file system later. */
#define DO_CERT 0x7f21
#define DRVDATA(card) ((struct pgp_priv_data *) ((card)->drv_data))
struct pgp_priv_data {
struct blob * mf;
struct blob * current; /* currently selected file */
enum _version bcd_version;
struct do_info *pgp_objects;
enum _card_state state; /* card state */
enum _ext_caps ext_caps; /* extended capabilities */
size_t max_challenge_size;
size_t max_cert_size;
sc_security_env_t sec_env;
};
/* ABI: check if card's ATR matches one of driver's */
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;
}
/* ABI: initialize driver */
static int
pgp_init(sc_card_t *card)
{
struct pgp_priv_data *priv;
sc_path_t aid;
sc_file_t *file = NULL;
struct do_info *info;
int r;
struct blob *child = NULL;
priv = calloc (1, sizeof *priv);
if (!priv)
return SC_ERROR_OUT_OF_MEMORY;
card->drv_data = priv;
card->cla = 0x00;
/* set pointer to correct list of card objects */
priv->pgp_objects = (card->type == SC_CARD_TYPE_OPENPGP_V2)
? pgp2_objects : pgp1_objects;
/* set detailed card version */
priv->bcd_version = (card->type == SC_CARD_TYPE_OPENPGP_V2)
? OPENPGP_CARD_2_0 : OPENPGP_CARD_1_1;
/* select application "OpenPGP" */
sc_format_path("D276:0001:2401", &aid);
aid.type = SC_PATH_TYPE_DF_NAME;
if ((r = iso_ops->select_file(card, &aid, &file)) < 0) {
pgp_finish(card);
return r;
}
/* read information from AID */
if (file && file->namelen == 16) {
/* OpenPGP card spec 1.1 & 2.0, section 4.2.1 & 4.1.2.1 */
priv->bcd_version = bebytes2ushort(file->name + 6);
/* kludge: get card's serial number from manufacturer ID + serial number */
memcpy(card->serialnr.value, file->name + 8, 6);
card->serialnr.len = 6;
}
/* change file path to MF for re-use in MF */
sc_format_path("3f00", &file->path);
/* set up the root of our fake file tree */
priv->mf = pgp_new_blob(card, NULL, 0x3f00, file);
if (!priv->mf) {
pgp_finish(card);
return SC_ERROR_OUT_OF_MEMORY;
}
/* select MF */
priv->current = priv->mf;
/* Populate MF - add matching blobs listed in the pgp_objects table. */
for (info = priv->pgp_objects; (info != NULL) && (info->id > 0); info++) {
if (((info->access & READ_MASK) == READ_ALWAYS) &&
(info->get_fn != NULL)) {
child = pgp_new_blob(card, priv->mf, info->id, sc_file_new());
/* catch out of memory condition */
if (child == NULL) {
pgp_finish(card);
return SC_ERROR_OUT_OF_MEMORY;
}
}
}
/* get card_features from ATR & DOs */
pgp_get_card_features(card);
return SC_SUCCESS;
}
/* internal: get features of the card: capabilitis, ... */
static int
pgp_get_card_features(sc_card_t *card)
{
struct pgp_priv_data *priv = DRVDATA (card);
unsigned char *hist_bytes = card->atr.value;
size_t atr_len = card->atr.len;
size_t i = 0;
struct blob *blob, *blob6e, *blob73;
/* parse card capabilities from historical bytes */
while ((i < atr_len) && (hist_bytes[i] != 0x73))
i++;
/* IS07816-4 hist bytes 3rd function table */
if ((hist_bytes[i] == 0x73) && (atr_len > i+3)) {
/* bit 0x40 in byte 3 of TL 0x73 means "extended Le/Lc" */
if (hist_bytes[i+3] & 0x40) {
card->caps |= SC_CARD_CAP_APDU_EXT;
priv->ext_caps |= EXT_CAP_APDU_EXT;
}
/* bit 0x80 in byte 3 of TL 0x73 means "Command chaining" */
if (hist_bytes[i+3] & 0x80)
priv->ext_caps |= EXT_CAP_CHAINING;
}
if (priv->bcd_version >= OPENPGP_CARD_2_0) {
/* get card capabilities from "historical bytes" DO */
if ((pgp_get_blob(card, priv->mf, 0x5f52, &blob) >= 0) &&
(blob->data != NULL) && (blob->data[0] == 0x00)) {
while ((i < blob->len) && (blob->data[i] != 0x73))
i++;
/* IS07816-4 hist bytes 3rd function table */
if ((blob->data[i] == 0x73) && (blob->len > i+3)) {
/* bit 0x40 in byte 3 of TL 0x73 means "extended Le/Lc" */
if (blob->data[i+3] & 0x40) {
card->caps |= SC_CARD_CAP_APDU_EXT;
priv->ext_caps |= EXT_CAP_APDU_EXT;
}
/* bit 0x80 in byte 3 of TL 0x73 means "Command chaining" */
if (hist_bytes[i+3] & 0x80)
priv->ext_caps |= EXT_CAP_CHAINING;
}
/* get card status from historical bytes status indicator */
if ((blob->data[0] == 0x00) && (blob->len >= 4))
priv->state = blob->data[blob->len-3];
}
}
if ((pgp_get_blob(card, priv->mf, 0x006e, &blob6e) >= 0) &&
(pgp_get_blob(card, blob6e, 0x0073, &blob73) >= 0)) {
/* get "extended capabilities" DO */
if ((pgp_get_blob(card, blob73, 0x00c0, &blob) >= 0) &&
(blob->data != NULL) && (blob->len > 0)) {
/* in v2.0 bit 0x04 in first byte means "algorithm attributes changeable */
if ((blob->data[0] & 0x04) && (card->type == SC_CARD_TYPE_OPENPGP_V2))
priv->ext_caps |= EXT_CAP_ALG_ATTR_CHANGEABLE;
/* bit 0x08 in first byte means "support for private use DOs" */
if (blob->data[0] & 0x08)
priv->ext_caps |= EXT_CAP_PRIVATE_DO;
/* bit 0x10 in first byte means "support for CHV status byte changeable" */
if (blob->data[0] & 0x10)
priv->ext_caps |= EXT_CAP_C4_CHANGEABLE;
/* bit 0x20 in first byte means "support for Key Import" */
if (blob->data[0] & 0x20)
priv->ext_caps |= EXT_CAP_KEY_IMPORT;
/* bit 0x40 in first byte means "support for Get Challenge" */
if (blob->data[0] & 0x40) {
card->caps |= SC_CARD_CAP_RNG;
priv->ext_caps |= EXT_CAP_GET_CHALLENGE;
}
/* in v2.0 bit 0x80 in first byte means "support Secure Messaging" */
if ((blob->data[0] & 0x80) && (card->type == SC_CARD_TYPE_OPENPGP_V2))
priv->ext_caps |= EXT_CAP_SM;
if ((priv->bcd_version >= OPENPGP_CARD_2_0) && (blob->len >= 10)) {
/* max. challenge size is at bytes 3-4 */
priv->max_challenge_size = bebytes2ushort(blob->data + 2);
/* max. cert size it at bytes 5-6 */
priv->max_cert_size = bebytes2ushort(blob->data + 4);
/* max. send/receive sizes are at bytes 7-8 resp. 9-10 */
card->max_send_size = bebytes2ushort(blob->data + 6);
card->max_recv_size = bebytes2ushort(blob->data + 8);
}
}
/* get max. PIN length from "CHV status bytes" DO */
if ((pgp_get_blob(card, blob73, 0x00c4, &blob) >= 0) &&
(blob->data != NULL) && (blob->len > 1)) {
/* 2nd byte in "CHV status bytes" DO means "max. PIN length" */
card->max_pin_len = blob->data[1];
}
/* get supported algorithms & key lengths from "algorithm attributes" DOs */
for (i = 0x00c1; i <= 0x00c3; i++) {
unsigned long flags;
/* Is this correct? */
/* OpenPGP card spec 1.1 & 2.0, section 2.1 */
flags = SC_ALGORITHM_RSA_RAW;
/* OpenPGP card spec 1.1 & 2.0, section 7.2.9 & 7.2.10 */
flags |= SC_ALGORITHM_RSA_PAD_PKCS1;
flags |= SC_ALGORITHM_RSA_HASH_NONE;
if ((pgp_get_blob(card, blob73, i, &blob) >= 0) &&
(blob->data != NULL) && (blob->len >= 4)) {
if (blob->data[0] == 0x01) { /* Algorithm ID [RFC4880]: RSA */
unsigned int keylen = bebytes2ushort(blob->data + 1);
_sc_card_add_rsa_alg(card, keylen, flags, 0);
}
}
}
}
return SC_SUCCESS;
}
/* ABI: terminate driver */
static int
pgp_finish(sc_card_t *card)
{
if (card != NULL) {
struct pgp_priv_data *priv = DRVDATA (card);
if (priv != NULL) {
/* delete fake file hierarchy */
pgp_iterate_blobs(priv->mf, 99, pgp_free_blob);
/* delete private data */
free(priv);
}
card->drv_data = NULL;
}
return SC_SUCCESS;
}
/* internal: fill a blob's data */
static int
pgp_set_blob(struct blob *blob, const u8 *data, size_t len)
{
if (blob->data)
free(blob->data);
blob->data = NULL;
blob->len = 0;
blob->status = 0;
if (len > 0) {
void *tmp = malloc(len);
if (tmp == NULL)
return SC_ERROR_OUT_OF_MEMORY;
blob->data = tmp;
blob->len = len;
memcpy(blob->data, data, len);
}
if (blob->file)
blob->file->size = len;
return SC_SUCCESS;
}
/**
* Internal: Implement Access Control List for emulated file.
* The Access Control is derived from the DO access permission.
**/
static int
pgp_attach_acl(sc_card_t *card, sc_file_t *file, struct do_info *info)
{
sc_acl_entry_t *acl;
unsigned int method = SC_AC_NONE;
unsigned long key_ref = 0;
/* Write access */
switch (info->access & WRITE_MASK) {
case WRITE_NEVER:
method = SC_AC_NEVER;
break;
case WRITE_PIN1:
method = SC_AC_CHV;
key_ref = 0x01;
break;
case WRITE_PIN2:
method = SC_AC_CHV;
key_ref = 0x01;
break;
case WRITE_PIN3:
method = SC_AC_CHV;
key_ref = 0x01;
break;
}
if (method != SC_AC_NONE || key_ref != 0) {
sc_file_add_acl_entry(file, SC_AC_OP_WRITE, method, key_ref);
sc_file_add_acl_entry(file, SC_AC_OP_UPDATE, method, key_ref);
sc_file_add_acl_entry(file, SC_AC_OP_DELETE, method, key_ref);
sc_file_add_acl_entry(file, SC_AC_OP_CREATE, method, key_ref);
}
method = SC_AC_NONE;
key_ref = 0;
/* Read access */
switch (info->access & READ_MASK) {
case READ_NEVER:
method = SC_AC_NEVER;
break;
case READ_PIN1:
method = SC_AC_CHV;
key_ref = 0x01;
break;
case READ_PIN2:
method = SC_AC_CHV;
key_ref = 0x01;
break;
case READ_PIN3:
method = SC_AC_CHV;
key_ref = 0x01;
break;
}
if (method != SC_AC_NONE || key_ref != 0) {
sc_file_add_acl_entry(file, SC_AC_OP_READ, method, key_ref);
}
}
/* internal: append a blob to the list of children of a given parent blob */
static struct blob *
pgp_new_blob(sc_card_t *card, struct blob *parent, unsigned int file_id,
sc_file_t *file)
{
struct blob *blob = NULL;
if (file == NULL)
return NULL;
if ((blob = calloc(1, sizeof(struct blob))) != NULL) {
struct pgp_priv_data *priv = DRVDATA (card);
struct do_info *info;
blob->file = file;
blob->file->type = SC_FILE_TYPE_WORKING_EF; /* default */
blob->file->ef_structure = SC_FILE_EF_TRANSPARENT;
blob->file->id = file_id;
blob->id = file_id;
blob->parent = parent;
if (parent != NULL) {
struct blob **p;
/* set file's path = parent's path + file's id */
blob->file->path = parent->file->path;
sc_append_file_id(&blob->file->path, file_id);
/* append blob to list of parent's children */
for (p = &parent->files; *p != NULL; p = &(*p)->next)
;
*p = blob;
}
else {
u8 id_str[2];
/* no parent: set file's path = file's id */
sc_format_path(ushort2bebytes(id_str, file_id), &blob->file->path);
}
/* find matching DO info: set file type depending on it */
for (info = priv->pgp_objects; (info != NULL) && (info->id > 0); info++) {
if (info->id == file_id) {
blob->info = info;
blob->file->type = blob->info->type;
pgp_attach_acl(card, blob->file, info);
break;
}
}
}
return blob;
}
/* internal: free a blob including its content */
static void
pgp_free_blob(struct blob *blob)
{
if (blob) {
if (blob->parent) {
struct blob **p;
/* remove blob from list of parent's children */
for (p = &blob->parent->files; *p != NULL && *p != blob; p = &(*p)->next)
;
if (*p == blob)
*p = blob->next;
}
if (blob->file)
sc_file_free(blob->file);
if (blob->data)
free(blob->data);
free(blob);
}
}
/* internal: iterate through the blob tree, calling a function for each blob */
static void
pgp_iterate_blobs(struct blob *blob, int level, void (*func)())
{
if (blob) {
if (level > 0) {
struct blob *child = blob->files;
while (child != NULL) {
struct blob *next = child->next;
pgp_iterate_blobs(child, level-1, func);
child = next;
}
}
func(blob);
}
}
/* internal: read a blob's contents from card */
static int
pgp_read_blob(sc_card_t *card, struct blob *blob)
{
if (blob->data != NULL)
return SC_SUCCESS;
if (blob->info == NULL)
return blob->status;
if (blob->info->get_fn) { /* readable, top-level DO */
u8 buffer[2048];
size_t buf_len = (card->caps & SC_CARD_CAP_APDU_EXT)
? sizeof(buffer) : 256;
int r = blob->info->get_fn(card, blob->id, buffer, buf_len);
if (r < 0) { /* an error occurred */
blob->status = r;
return r;
}
return pgp_set_blob(blob, buffer, r);
}
else { /* un-readable DO or part of a constructed DO */
return SC_SUCCESS;
}
}
/*
* internal: Enumerate contents of a data blob.
* The OpenPGP card has a TLV encoding according ASN.1 BER-encoding rules.
*/
static int
pgp_enumerate_blob(sc_card_t *card, struct blob *blob)
{
const u8 *in;
int r;
if (blob->files != NULL)
return SC_SUCCESS;
if ((r = pgp_read_blob(card, blob)) < 0)
return r;
in = blob->data;
while ((int) blob->len > (in - blob->data)) {
unsigned int cla, tag, tmptag;
size_t len;
const u8 *data = in;
struct blob *new;
r = sc_asn1_read_tag(&data, blob->len - (in - blob->data),
&cla, &tag, &len);
if (r < 0) {
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL,
"Unexpected end of contents\n");
return SC_ERROR_OBJECT_NOT_VALID;
}
/* undo ASN1's split of tag & class */
for (tmptag = tag; tmptag > 0x0FF; tmptag >>= 8) {
cla <<= 8;
}
tag |= cla;
/* create fake file system hierarchy by
* using constructed DOs as DF */
if ((new = pgp_new_blob(card, blob, tag, sc_file_new())) == NULL)
return SC_ERROR_OUT_OF_MEMORY;
pgp_set_blob(new, data, len);
in = data + len;
}
return SC_SUCCESS;
}
/* internal: find a blob by ID below a given parent, filling its contents when necessary */
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) {
(void) pgp_read_blob(card, child);
*ret = child;
return SC_SUCCESS;
}
}
return SC_ERROR_FILE_NOT_FOUND;
}
/* Internal: search recursively for a blob by ID below a given root */
static int
pgp_seek_blob(sc_card_t *card, struct blob *root, unsigned int id,
struct blob **ret)
{
struct blob *child;
int r;
if ((r = pgp_get_blob(card, root, id, ret)) == 0)
/* The sought blob is right under root */
return r;
/* Not found, seek deeper */
for (child = root->files; child; child = child->next) {
/* The DO of SIMPLE type or the DO holding certificate
* does not contain children */
if (child->info->type == SIMPLE || child->id == DO_CERT)
continue;
r = pgp_seek_blob(card, child, id, ret);
if (r == 0)
return r;
}
return SC_ERROR_FILE_NOT_FOUND;
}
/* internal: find a blob by tag - pgp_seek_blob with optimizations */
static struct blob *
pgp_find_blob(sc_card_t *card, unsigned int tag)
{
struct pgp_priv_data *priv = DRVDATA(card);
struct blob *blob = NULL;
int r;
/* Check if current selected blob is which we want to test*/
if (priv->current->id == tag) {
return priv->current;
}
/* Look for the blob representing the DO */
r = pgp_seek_blob(card, priv->mf, tag, &blob);
if (r < 0) {
sc_log(card->ctx, "Failed to seek the blob representing the tag %04X. Error %d.", tag, r);
return NULL;
}
return blob;
}
/**
* Strip out the parts of PKCS15 file layout in the path. Get the reduced version
* which is understood by the OpenPGP card driver.
* Return the index whose preceding part will be ignored.
**/
static unsigned int pgp_strip_path(sc_card_t *card, const sc_path_t *path)
{
unsigned int start_point = 0;
/* start_point will move through the path string */
if (path->value == NULL || path->len == 0)
return 0;
/* Ignore 3F00 (MF) at the beginning */
start_point = (memcmp(path->value, "\x3f\x00", 2) == 0) ? 2 : 0;
/* Strip path of PKCS15-AppDF (5015) */
start_point += (memcmp(path->value + start_point, "\x50\x15", 2) == 0) ? 2 : 0;
return start_point;
}
/* ABI: SELECT FILE */
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;
unsigned int path_start = 0;
unsigned int n;
LOG_FUNC_CALLED(card->ctx);
if (path->type == SC_PATH_TYPE_DF_NAME)
LOG_FUNC_RETURN(card->ctx, iso_ops->select_file(card, path, ret));
if (path->len < 2 || (path->len & 1))
LOG_TEST_RET(card->ctx, SC_ERROR_INVALID_ARGUMENTS,
"invalid path length");
if (path->type == SC_PATH_TYPE_FILE_ID && path->len != 2)
LOG_TEST_RET(card->ctx, SC_ERROR_INVALID_ARGUMENTS,
"invalid path type");
/* ignore explicitely mentioned MF at the path's beginning */
path_start = pgp_strip_path(card, path);
/* starting with the MF ... */
blob = priv->mf;
/* ... recurse through the tree following the path */
for (n = path_start; n < path->len; n += 2) {
unsigned int id = bebytes2ushort(path->value + n);
int r = pgp_get_blob(card, blob, id, &blob);
if (r < 0) { /* failure */
priv->current = NULL;
LOG_FUNC_RETURN(card->ctx, r);
}
}
/* success: select file = set "current" pointer to blob found */
priv->current = blob;
if (ret)
sc_file_dup(ret, blob->file);
LOG_FUNC_RETURN(card->ctx, SC_SUCCESS);
}
/* ABI: LIST FILES */
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;
LOG_FUNC_CALLED(card->ctx);
/* jump to selected file */
blob = priv->current;
if (blob->file->type != SC_FILE_TYPE_DF)
LOG_TEST_RET(card->ctx, SC_ERROR_OBJECT_NOT_VALID,
"invalid file type");
if ((r = pgp_enumerate_blob(card, blob)) < 0)
LOG_FUNC_RETURN(card->ctx, r);
for (k = 0, blob = blob->files; blob != NULL; blob = blob->next) {
if (blob->info != NULL && (blob->info->access & READ_MASK) != READ_NEVER) {
if (k + 2 > buflen)
LOG_FUNC_RETURN(card->ctx, SC_ERROR_BUFFER_TOO_SMALL);
ushort2bebytes(buf + k, blob->id);
k += 2;
}
}
LOG_FUNC_RETURN(card->ctx, k);
}
/* ABI: READ BINARY */
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;
LOG_FUNC_CALLED(card->ctx);
/* jump to selected file */
blob = priv->current;
if (blob == NULL)
LOG_FUNC_RETURN(card->ctx, SC_ERROR_FILE_NOT_FOUND);
if (blob->file->type != SC_FILE_TYPE_WORKING_EF)
LOG_FUNC_RETURN(card->ctx, SC_ERROR_FILE_NOT_FOUND);
if ((r = pgp_read_blob(card, blob)) < 0)
LOG_FUNC_RETURN(card->ctx, r);
if (idx > blob->len)
LOG_FUNC_RETURN(card->ctx, SC_ERROR_INCORRECT_PARAMETERS);
if (idx + count > blob->len)
count = blob->len - idx;
memcpy(buf, blob->data + idx, count);
LOG_FUNC_RETURN(card->ctx, count);
}
/* ABI: WRITE BINARY */
static int
pgp_write_binary(sc_card_t *card, unsigned int idx,
const u8 *buf, size_t count, unsigned long flags)
{
LOG_FUNC_RETURN(card->ctx, SC_ERROR_NOT_SUPPORTED);
}
/* internal: get public key from card: as DF + sub-wEFs */
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_log(card->ctx, "called, tag=%04x\n", tag);
sc_format_apdu(card, &apdu, SC_APDU_CASE_4, 0x47, 0x81, 0);
apdu.lc = 2;
apdu.data = ushort2bebytes(idbuf, tag);
apdu.datalen = 2;
apdu.le = ((buf_len >= 256) && !(card->caps & SC_CARD_CAP_APDU_EXT)) ? 256 : buf_len;
apdu.resp = buf;
apdu.resplen = buf_len;
r = sc_transmit_apdu(card, &apdu);
LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
LOG_TEST_RET(card->ctx, r, "Card returned error");
LOG_FUNC_RETURN(card->ctx, apdu.resplen);
}
/* internal: get public key from card: as one wEF */
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_log(card->ctx, "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)
LOG_TEST_RET(card->ctx, r, "error getting elements");
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;
r = sc_pkcs15_encode_pubkey(card->ctx, &pubkey, &data, &len);
LOG_TEST_RET(card->ctx, r, "public key encoding failed");
if (len > buf_len)
len = buf_len;
memcpy(buf, data, len);
free(data);
LOG_FUNC_RETURN(card->ctx, len);
}
/* ABI: GET DATA */
static int
pgp_get_data(sc_card_t *card, unsigned int tag, u8 *buf, size_t buf_len)
{
sc_apdu_t apdu;
int r;
LOG_FUNC_CALLED(card->ctx);
sc_format_apdu(card, &apdu, SC_APDU_CASE_2, 0xCA, tag >> 8, tag);
apdu.le = ((buf_len >= 256) && !(card->caps & SC_CARD_CAP_APDU_EXT)) ? 256 : buf_len;
apdu.resp = buf;
apdu.resplen = buf_len;
r = sc_transmit_apdu(card, &apdu);
LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
LOG_TEST_RET(card->ctx, r, "Card returned error");
LOG_FUNC_RETURN(card->ctx, apdu.resplen);
}
/* ABI: PUT DATA */
static int
pgp_put_data(sc_card_t *card, unsigned int tag, const u8 *buf, size_t buf_len)
{
sc_apdu_t apdu;
struct pgp_priv_data *priv = DRVDATA(card);
struct blob *affected_blob = NULL;
u8 ins = 0xDA;
u8 p1 = tag >> 8;
u8 p2 = tag;
int r;
LOG_FUNC_CALLED(card->ctx);
/* Check if the tag is writable */
affected_blob = pgp_find_blob(card, tag);
if (affected_blob == NULL || (affected_blob->info->access & WRITE_MASK) == WRITE_NEVER) {
sc_log(card->ctx, "The %04X DO is not writable.", tag);
return SC_ERROR_NOT_ALLOWED;
}
/* Check data size.
* We won't check other DOs than 7F21 (certificate), because their capacity
* is hard-codded and may change in various version of the card. If we check here,
* the driver may be sticked to a limit version number of card.
* 7F21 size is soft-coded, so we can check it. */
if (tag == DO_CERT && buf_len > priv->max_cert_size) {
sc_log(card->ctx, "Data exceeds DO limit. It should be smaller than %d bytes.", priv->max_cert_size);
return SC_ERROR_WRONG_LENGTH;
}
/* Extended Header list (004D DO) needs a variant of PUT DATA command */
if (tag == 0x004D) {
ins = 0xDB;
p1 = 0x3F;
p2 = 0xFF;
}
/* Build APDU */
/* Large data can be sent via extended APDU, if card supports */
if (buf_len > 256 && card->caps & SC_CARD_CAP_APDU_EXT) {
sc_format_apdu(card, &apdu, SC_APDU_CASE_3_EXT, ins, p1, p2);
}
/* Card/Reader does not support extended, use command chaining, if supported */
else if (buf_len > 256 && priv->ext_caps & EXT_CAP_CHAINING) {
sc_format_apdu(card, &apdu, SC_APDU_CASE_3, ins, p1, p2);
apdu.flags |= SC_APDU_FLAGS_CHAINING;
/* FIXME: The case of command chaining is not tested. */
}
else if (buf_len <= 256) {
sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, ins, p1, p2);
}
else {
sc_log(card->ctx, "Data is too big to send.");
return SC_ERROR_INVALID_DATA;
}
apdu.data = buf;
apdu.datalen = buf_len;
apdu.lc = buf_len;
if (buf == NULL && buf_len == 0) {
/* Erase DO content.
*
* We won't call sc_transmit_apdu() in order to bypass
* the check of APDU, because sc_transmit_apdu() does not allow
* null data. */
r = sc_lock(card); /* acquire card lock*/
sc_log(card->ctx, "card->reader->ops->transmit");
r = card->reader->ops->transmit(card->reader, &apdu);
/* all done => release lock */
if (sc_unlock(card) != SC_SUCCESS)
sc_debug(card->ctx, SC_LOG_DEBUG_NORMAL, "sc_unlock failed");
return r;
}
/* Send APDU to card */
r = sc_transmit_apdu(card, &apdu);
LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
/* Check response */
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
/* Instruct more in case of error */
if (r == SC_ERROR_SECURITY_STATUS_NOT_SATISFIED) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Please verify PIN first.");
}
LOG_TEST_RET(card->ctx, r, "Card returned error");
/* Update the corresponding file */
sc_log(card->ctx, "To update the corresponding blob data");
r = pgp_set_blob(affected_blob, buf, buf_len);
if (r < 0)
sc_log(card->ctx, "Failed to update the blob %04X. Error %d.", affected_blob->id, r);
/* The pgp_update_tag_blob()'s failure won't affect */
SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, buf_len);
}
/* ABI: PIN cmd: verify/change/unblock a PIN */
static int
pgp_pin_cmd(sc_card_t *card, struct sc_pin_cmd_data *data, int *tries_left)
{
LOG_FUNC_CALLED(card->ctx);
if (data->pin_type != SC_AC_CHV)
LOG_TEST_RET(card->ctx, SC_ERROR_INVALID_ARGUMENTS,
"invalid PIN type");
/* In general, the PIN Reference is extracted from the key-id, for
* example, CHV0 -> Ref=0, CHV1 -> Ref=1.
* However, in the case of OpenGPG, the PIN Ref to compose APDU
* must be 81, 82, 83.
* So, if we receive Ref=1, Ref=2, we must convert to 81, 82...
* In OpenPGP ver 1, the PINs are named CHV1, CHV2, CHV3. In ver 2, they
* are named PW1, PW3 (PW1 operates in 2 modes). However, the PIN references (P2 in APDU)
* are the same between 2 version:
* 81 (CHV1 or PW1), 82 (CHV2 or PW1-mode 2), 83 (CHV3 or PW3).
*
* Note that if this function is called from sc_pkcs15_verify_pin() in pkcs15-pin.c,
* the Ref is already 81, 82, 83.
*/
/* Convert the PIN Reference if needed */
data->pin_reference |= 0x80;
/* Ensure pin_reference is 81, 82, 83 */
if (!(data->pin_reference == 0x81 || data->pin_reference == 0x82 || data->pin_reference == 0x83)) {
LOG_TEST_RET(card->ctx, SC_ERROR_INVALID_ARGUMENTS,
"key-id should be 1, 2, 3.");
}
LOG_FUNC_RETURN(card->ctx, iso_ops->pin_cmd(card, data, tries_left));
}
/* ABI: set security environment */
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);
LOG_FUNC_CALLED(card->ctx);
if ((env->flags & SC_SEC_ENV_ALG_PRESENT) && (env->algorithm != SC_ALGORITHM_RSA))
LOG_TEST_RET(card->ctx, SC_ERROR_INVALID_ARGUMENTS,
"only RSA algorithm supported");
if (!(env->flags & SC_SEC_ENV_KEY_REF_PRESENT) || (env->key_ref_len != 1))
LOG_TEST_RET(card->ctx, SC_ERROR_INVALID_ARGUMENTS,
"exactly one key reference required");
if (env->flags & SC_SEC_ENV_FILE_REF_PRESENT)
LOG_TEST_RET(card->ctx, SC_ERROR_INVALID_ARGUMENTS,
"passing file references not supported");
switch (env->operation) {
case SC_SEC_OPERATION_SIGN:
if (env->key_ref[0] != 0x00 && env->key_ref[0] != 0x02) {
LOG_TEST_RET(card->ctx, SC_ERROR_NOT_SUPPORTED,
"Key reference not compatible with "
"requested usage");
}
break;
case SC_SEC_OPERATION_DECIPHER:
if (env->key_ref[0] != 0x01) {
LOG_TEST_RET(card->ctx, SC_ERROR_NOT_SUPPORTED,
"Key reference not compatible with "
"requested usage");
}
break;
default:
LOG_TEST_RET(card->ctx, SC_ERROR_INVALID_ARGUMENTS,
"invalid operation");
}
priv->sec_env = *env;
LOG_FUNC_RETURN(card->ctx, SC_SUCCESS);
}
/* ABI: COMPUTE DIGITAL SIGNATURE */
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;
LOG_FUNC_CALLED(card->ctx);
if (env->operation != SC_SEC_OPERATION_SIGN)
LOG_TEST_RET(card->ctx, SC_ERROR_INVALID_ARGUMENTS,
"invalid operation");
switch (env->key_ref[0]) {
case 0x00: /* signature key */
/* PSO SIGNATURE */
sc_format_apdu(card, &apdu, SC_APDU_CASE_4, 0x2A, 0x9E, 0x9A);
break;
case 0x02: /* authentication key */
/* INTERNAL AUTHENTICATE */
sc_format_apdu(card, &apdu, SC_APDU_CASE_4, 0x88, 0, 0);
break;
case 0x01:
default:
LOG_TEST_RET(card->ctx, SC_ERROR_INVALID_ARGUMENTS,
"invalid key reference");
}
apdu.lc = data_len;
apdu.data = data;
apdu.datalen = data_len;
apdu.le = ((outlen >= 256) && !(card->caps & SC_CARD_CAP_APDU_EXT)) ? 256 : outlen;
apdu.resp = out;
apdu.resplen = outlen;
r = sc_transmit_apdu(card, &apdu);
LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
LOG_TEST_RET(card->ctx, r, "Card returned error");
LOG_FUNC_RETURN(card->ctx, apdu.resplen);
}
/* ABI: DECIPHER */
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;
LOG_FUNC_CALLED(card->ctx);
/* There's some funny padding indicator that must be
* prepended... hmm. */
if (!(temp = malloc(inlen + 1)))
LOG_FUNC_RETURN(card->ctx, 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);
LOG_TEST_RET(card->ctx, SC_ERROR_INVALID_ARGUMENTS,
"invalid operation");
}
switch (env->key_ref[0]) {
case 0x01: /* Decryption key */
/* PSO DECIPHER */
sc_format_apdu(card, &apdu, SC_APDU_CASE_4, 0x2A, 0x80, 0x86);
break;
case 0x00: /* signature key */
case 0x02: /* authentication key */
default:
free(temp);
LOG_TEST_RET(card->ctx, SC_ERROR_INVALID_ARGUMENTS,
"invalid key reference");
}
apdu.lc = inlen;
apdu.data = in;
apdu.datalen = inlen;
apdu.le = ((outlen >= 256) && !(card->caps & SC_CARD_CAP_APDU_EXT)) ? 256 : outlen;
apdu.resp = out;
apdu.resplen = outlen;
r = sc_transmit_apdu(card, &apdu);
free(temp);
LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
LOG_TEST_RET(card->ctx, r, "Card returned error");
LOG_FUNC_RETURN(card->ctx, apdu.resplen);
}
/**
* Internal: Parse response data of key generation and update blob.
**/
static int
pgp_parse_and_update_pubkey_info(sc_card_t *card, u8* data, size_t data_len,
sc_cardctl_openpgp_keygen_info_t *key_info)
{
struct pgp_priv_data *priv = DRVDATA(card);
struct blob *kinfo_blob;
struct blob *modulus_blob;
struct blob *exponent_blob;
u8 *in = data;
int r;
LOG_FUNC_CALLED(card->ctx);
while (data_len > (in - data)) {
unsigned int cla, tag, tmptag;
size_t len;
u8 *part = in;
/* Parse TLV structure */
r = sc_asn1_read_tag((const u8**)&part,
data_len - (in - data),
&cla, &tag, &len);
LOG_TEST_RET(card->ctx, r, "Unexpected end of contents.");
/* Undo ASN1's split of tag & class */
for (tmptag = tag; tmptag > 0x0FF; tmptag >>= 8) {
cla <<= 8;
}
tag |= cla;
if (tag == 0x7f49) {
r = pgp_get_blob(card, priv->mf, tag, &kinfo_blob);
LOG_TEST_RET(card->ctx, r, "Can not get the blob storing pubkey info.");
}
else if (tag == 0x0081) {
/* Set the output data */
if (key_info->modulus) {
memcpy(key_info->modulus, part, len);
key_info->modulus_len = len;
}
/* Update the corresponding blob content */
r = pgp_get_blob(card, kinfo_blob, tag, &modulus_blob);
LOG_TEST_RET(card->ctx, r, "Can not get the blob storing modulus info.");
pgp_set_blob(modulus_blob, part, len);
}
else if (tag == 0x0082) {
/* Set the output data */
if (key_info->exponent) {
memcpy(key_info->exponent, part, len);
key_info->exponent_len = len;
}
/* Update the corresponding blob content */
r = pgp_get_blob(card, kinfo_blob, tag, &exponent_blob);
LOG_TEST_RET(card->ctx, r, "Can not get the blob storing exponent info.");
pgp_set_blob(exponent_blob, part, len);
}
/* Go to next part to parse */
in = part + len;
}
LOG_FUNC_RETURN(card->ctx, r);
}
/**
* Generate key
**/
static int pgp_gen_key(sc_card_t *card, sc_cardctl_openpgp_keygen_info_t *key_info)
{
struct pgp_priv_data *priv = DRVDATA(card);
struct blob *algo_blob;
sc_apdu_t apdu;
unsigned int modulus_bitlen;
u8 apdu_case;
int r = SC_SUCCESS;
if (key_info->keytype == SC_OPENPGP_KEY_SIGN)
apdu.data = "\xb6";
else if (key_info->keytype == SC_OPENPGP_KEY_ENCR)
apdu.data = "\xb8";
else if (key_info->keytype == SC_OPENPGP_KEY_AUTH)
apdu.data = "\xa4";
else {
sc_log(card->ctx, "Unknown key type %X.", key_info->keytype);
LOG_FUNC_RETURN(card->ctx, SC_ERROR_INVALID_ARGUMENTS);
}
apdu.datalen = 2; /* Data = B600 */
apdu.lc = 2;
/* Get supported modulus length, to specify Le for APDU */
r = pgp_get_blob(card, priv->mf, (0x00C0 | key_info->keytype), &algo_blob);
LOG_TEST_RET(card->ctx, r, "Don't know supported modulus length");
modulus_bitlen = bebytes2ushort(algo_blob->data + 1); /* The modulus length is coded in byte 2 & 3 */
/* Test whether we will need extended length mode. 1900 is an
* arbitrary length which for sure fits into a short apdu.
* This idea is borrowed from GnuPG code. */
if (card->caps & SC_CARD_CAP_APDU_EXT && modulus_bitlen > 1900) {
apdu.le = card->max_recv_size;
apdu_case = SC_APDU_CASE_4_EXT;
}
else {
apdu.le = 256;
apdu_case = SC_APDU_CASE_4_SHORT;
}
/* Buffer to receive response */
apdu.resp = malloc(apdu.le);
if (apdu.resp == NULL) {
LOG_FUNC_RETURN(card->ctx, SC_ERROR_NOT_ENOUGH_MEMORY);
}
apdu.resplen = apdu.le;
sc_format_apdu(card, &apdu, apdu_case, 0x47, 0x80, 0);
r = sc_transmit_apdu(card, &apdu);
if (r < 0) {
sc_log(card->ctx, "APDU transmit failed. Error %s.", sc_strerror(r));
goto finish;
}
/* Check response */
r = sc_check_sw(card, apdu.sw1, apdu.sw2);
/* Instruct more in case of error */
if (r == SC_ERROR_SECURITY_STATUS_NOT_SATISFIED) {
sc_debug(card->ctx, SC_LOG_DEBUG_VERBOSE, "Please verify PIN first.");
goto finish;
}
/* Parse the returned data (pubkey info) and update blob */
r = pgp_parse_and_update_pubkey_info(card, apdu.resp, apdu.resplen, key_info);
finish:
free(apdu.resp);
LOG_FUNC_RETURN(card->ctx, r);
}
/* ABI: card ctl: perform special card-specific operations */
static int pgp_card_ctl(sc_card_t *card, unsigned long cmd, void *ptr)
{
int r;
LOG_FUNC_CALLED(card->ctx);
switch(cmd) {
case SC_CARDCTL_GET_SERIALNR:
memmove((sc_serial_number_t *) ptr, &card->serialnr, sizeof(card->serialnr));
LOG_FUNC_RETURN(card->ctx, SC_SUCCESS);
break;
case SC_CARDCTL_OPENPGP_GENERATE_KEY:
r = pgp_gen_key(card, (sc_cardctl_openpgp_keygen_info_t *) ptr);
LOG_FUNC_RETURN(card->ctx, r);
}
LOG_FUNC_RETURN(card->ctx, SC_ERROR_NOT_SUPPORTED);
}
/* ABI: Delete file */
static int pgp_delete_file(sc_card_t *card, const sc_path_t *path)
{
struct pgp_priv_data *priv = DRVDATA(card);
sc_file_t *file;
struct blob *affected_blob;
u8 *data;
size_t len;
int r;
LOG_FUNC_CALLED(card->ctx);
/* In sc_pkcs15init_delete_by_path(), the path type was set to SC_PATH_TYPE_FILE_ID */
r = pgp_select_file(card, path, &file);
LOG_TEST_RET(card->ctx, r, "Cannot select file.");
affected_blob = priv->current;
len = affected_blob->len;
/* Create zero-filled buffer to put to DO.
* Though the spec says that PUT DATA with Lc=0 can erase the DO,
* but this format of APDU is not allowed by OpenSC and in fact,
* my CryptoStick responds "64 00" (execution error).
* So, to erase DO, we will put all zeros to it. */
data = malloc(affected_blob->len);
if (data == NULL)
LOG_FUNC_RETURN(card->ctx, SC_ERROR_OUT_OF_MEMORY);
memset(data, 0, len);
r = pgp_put_data(card, file->id, data, len);
if (r < 0)
sc_log(card->ctx, "Failed to erase %04X DO: %s", file->id, sc_strerror(r));
free(data);
return r;
}
/* ABI: Update binary */
static int pgp_update_binary(sc_card_t *card, unsigned int idx,
const u8 *buf, size_t count, unsigned long flags)
{
struct pgp_priv_data *priv = DRVDATA(card);
struct blob *affected_blob = priv->current;
u8 *alldata;
size_t allength;
int r;
/* We will use PUT DATA to write to DO.
* This command does not support index, so we will write the overall data,
* in which the part before idx is get from old content of DO */
allength = idx + count;
alldata = malloc(allength);
if (alldata == NULL)
LOG_FUNC_RETURN(card->ctx, SC_ERROR_OUT_OF_MEMORY);
memset(alldata, 0, allength);
/* Copy the part before idx */
memcpy(alldata, affected_blob->data, MIN(idx, affected_blob->len));
/* Copy data need to be written */
memcpy(alldata, buf, count);
r = pgp_put_data(card, affected_blob->id, alldata, allength);
if (r < 0) {
sc_log(card->ctx, "Failed to update binary. %s", sc_strerror(r));
}
free(alldata);
return r;
}
/* ABI: 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;
pgp_ops.card_ctl = pgp_card_ctl;
pgp_ops.delete_file = pgp_delete_file;
pgp_ops.update_binary = pgp_update_binary;
return &pgp_drv;
}
struct sc_card_driver *
sc_get_openpgp_driver(void)
{
return sc_get_driver();
}
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