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gnupg/scd/card-p15.c
Werner Koch b008274afd Nuked almost all trailing white space. 
We better do this once and for all instead of cluttering all future
commits with diffs of trailing white spaces.  In the majority of cases
blank or single lines are affected and thus this change won't disturb
a git blame too much.  For future commits the pre-commit scripts
checks that this won't happen again.
2011-02-04 12:57:53 +01:00

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/* card-p15.c - PKCS-15 based card access
* Copyright (C) 2002 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#ifdef HAVE_OPENSC
#include <opensc/pkcs15.h>
#include "scdaemon.h"
#include <ksba.h>
#include "card-common.h"
struct p15private_s {
int n_prkey_rsa_objs;
struct sc_pkcs15_object *prkey_rsa_objs[32];
int n_cert_objs;
struct sc_pkcs15_object *cert_objs[32];
};
/* Allocate private data. */
static int
init_private_data (CARD card)
{
struct p15private_s *priv;
int rc;
if (card->p15priv)
return 0; /* already done. */
priv = xtrycalloc (1, sizeof *priv);
if (!priv)
return gpg_error (gpg_err_code_from_errno (errno));
/* OpenSC (0.7.0) is a bit strange in that the get_objects functions
tries to be a bit too clever and implicitly does an enumeration
which eventually leads to the fact that every call to this
fucntion returns one more macthing object. The old code in
p15_enum_keypairs assume that it would alwyas return the same
numer of objects and used this to figure out what the last object
enumerated is. We now do an enum_objects just once and keep it
in the private data. */
rc = sc_pkcs15_get_objects (card->p15card, SC_PKCS15_TYPE_PRKEY_RSA,
priv->prkey_rsa_objs,
DIM (priv->prkey_rsa_objs));
if (rc < 0)
{
log_error ("private keys enumeration failed: %s\n", sc_strerror (rc));
xfree (priv);
return gpg_error (GPG_ERR_CARD);
}
priv->n_prkey_rsa_objs = rc;
/* Read all certificate objects. */
rc = sc_pkcs15_get_objects (card->p15card, SC_PKCS15_TYPE_CERT_X509,
priv->cert_objs,
DIM (priv->cert_objs));
if (rc < 0)
{
log_error ("private keys enumeration failed: %s\n", sc_strerror (rc));
xfree (priv);
return gpg_error (GPG_ERR_CARD);
}
priv->n_cert_objs = rc;
card->p15priv = priv;
return 0;
}
/* Release private data used in this module. */
void
p15_release_private_data (CARD card)
{
if (!card->p15priv)
return;
xfree (card->p15priv);
card->p15priv = NULL;
}
/* See card.c for interface description */
static int
p15_enum_keypairs (CARD card, int idx,
unsigned char *keygrip, char **keyid)
{
int rc;
struct p15private_s *priv;
struct sc_pkcs15_object *tmpobj;
int nobjs;
struct sc_pkcs15_prkey_info *pinfo;
struct sc_pkcs15_cert_info *certinfo;
struct sc_pkcs15_cert *certder;
ksba_cert_t cert;
rc = init_private_data (card);
if (rc)
return rc;
priv = card->p15priv;
nobjs = priv->n_prkey_rsa_objs;
rc = 0;
if (idx >= nobjs)
return -1;
pinfo = priv->prkey_rsa_objs[idx]->data;
/* now we need to read the certificate so that we can calculate the
keygrip */
rc = sc_pkcs15_find_cert_by_id (card->p15card, &pinfo->id, &tmpobj);
if (rc)
{
log_info ("certificate for private key %d not found: %s\n",
idx, sc_strerror (rc));
/* note, that we return the ID anyway */
rc = gpg_error (GPG_ERR_MISSING_CERT);
goto return_keyid;
}
certinfo = tmpobj->data;
rc = sc_pkcs15_read_certificate (card->p15card, certinfo, &certder);
if (rc)
{
log_info ("failed to read certificate for private key %d: %s\n",
idx, sc_strerror (rc));
return gpg_error (GPG_ERR_CARD);
}
rc = ksba_cert_new (&cert);
if (rc)
{
sc_pkcs15_free_certificate (certder);
return rc;
}
rc = ksba_cert_init_from_mem (cert, certder->data, certder->data_len);
sc_pkcs15_free_certificate (certder);
if (rc)
{
log_error ("failed to parse the certificate for private key %d: %s\n",
idx, gpg_strerror (rc));
ksba_cert_release (cert);
return rc;
}
if (card_help_get_keygrip (cert, keygrip))
{
log_error ("failed to calculate the keygrip of private key %d\n", idx);
ksba_cert_release (cert);
return gpg_error (GPG_ERR_CARD);
}
ksba_cert_release (cert);
rc = 0;
return_keyid:
if (keyid)
{
char *p;
*keyid = p = xtrymalloc (9+pinfo->id.len*2+1);
if (!*keyid)
return gpg_error (gpg_err_code_from_errno (errno));
p = stpcpy (p, "P15-5015.");
bin2hex (pinfo->id.value, pinfo->id.len, p);
}
return rc;
}
/* See card.c for interface description */
static int
p15_enum_certs (CARD card, int idx, char **certid, int *type)
{
int rc;
struct p15private_s *priv;
struct sc_pkcs15_object *obj;
struct sc_pkcs15_cert_info *cinfo;
int nobjs;
rc = init_private_data (card);
if (rc)
return rc;
priv = card->p15priv;
nobjs = priv->n_cert_objs;
rc = 0;
if (idx >= nobjs)
return -1;
obj = priv->cert_objs[idx];
cinfo = obj->data;
if (certid)
{
char *p;
int i;
*certid = p = xtrymalloc (9+cinfo->id.len*2+1);
if (!*certid)
return gpg_error (gpg_err_code_from_errno (errno));
p = stpcpy (p, "P15-5015.");
bin2hex (cinfo->id.value, cinfo->id.len, p);
}
if (type)
{
if (!obj->df)
*type = 0; /* unknown */
else if (obj->df->type == SC_PKCS15_CDF)
*type = 100;
else if (obj->df->type == SC_PKCS15_CDF_TRUSTED)
*type = 101;
else if (obj->df->type == SC_PKCS15_CDF_USEFUL)
*type = 102;
else
*type = 0; /* error -> unknown */
}
return rc;
}
static int
idstr_to_id (const char *idstr, struct sc_pkcs15_id *id)
{
const char *s;
int n;
/* For now we only support the standard DF */
if (strncmp (idstr, "P15-5015.", 9) )
return gpg_error (GPG_ERR_INV_ID);
for (s=idstr+9, n=0; hexdigitp (s); s++, n++)
;
if (*s || (n&1))
return gpg_error (GPG_ERR_INV_ID); /*invalid or odd number of digits*/
n /= 2;
if (!n || n > SC_PKCS15_MAX_ID_SIZE)
return gpg_error (GPG_ERR_INV_ID); /* empty or too large */
for (s=idstr+9, n=0; *s; s += 2, n++)
id->value[n] = xtoi_2 (s);
id->len = n;
return 0;
}
/* See card.c for interface description */
static int
p15_read_cert (CARD card, const char *certidstr,
unsigned char **cert, size_t *ncert)
{
struct sc_pkcs15_object *tmpobj;
struct sc_pkcs15_id certid;
struct sc_pkcs15_cert_info *certinfo;
struct sc_pkcs15_cert *certder;
int rc;
if (!card || !certidstr || !cert || !ncert)
return gpg_error (GPG_ERR_INV_VALUE);
if (!card->p15card)
return gpg_error (GPG_ERR_NO_PKCS15_APP);
rc = idstr_to_id (certidstr, &certid);
if (rc)
return rc;
rc = sc_pkcs15_find_cert_by_id (card->p15card, &certid, &tmpobj);
if (rc)
{
log_info ("certificate '%s' not found: %s\n",
certidstr, sc_strerror (rc));
return -1;
}
certinfo = tmpobj->data;
rc = sc_pkcs15_read_certificate (card->p15card, certinfo, &certder);
if (rc)
{
log_info ("failed to read certificate '%s': %s\n",
certidstr, sc_strerror (rc));
return gpg_error (GPG_ERR_CARD);
}
*cert = xtrymalloc (certder->data_len);
if (!*cert)
{
gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
sc_pkcs15_free_certificate (certder);
return tmperr;
}
memcpy (*cert, certder->data, certder->data_len);
*ncert = certder->data_len;
sc_pkcs15_free_certificate (certder);
return 0;
}
static int
p15_prepare_key (CARD card, const char *keyidstr,
int (pincb)(void*, const char *, char **),
void *pincb_arg, struct sc_pkcs15_object **r_keyobj)
{
struct sc_pkcs15_id keyid;
struct sc_pkcs15_pin_info *pin;
struct sc_pkcs15_object *keyobj, *pinobj;
char *pinvalue;
int rc;
rc = idstr_to_id (keyidstr, &keyid);
if (rc)
return rc;
rc = sc_pkcs15_find_prkey_by_id (card->p15card, &keyid, &keyobj);
if (rc < 0)
{
log_error ("private key not found: %s\n", sc_strerror(rc));
return gpg_error (GPG_ERR_NO_SECKEY);
}
rc = sc_pkcs15_find_pin_by_auth_id (card->p15card,
&keyobj->auth_id, &pinobj);
if (rc)
{
log_error ("failed to find PIN by auth ID: %s\n", sc_strerror (rc));
return gpg_error (GPG_ERR_BAD_PIN_METHOD);
}
pin = pinobj->data;
/* Fixme: pack this into a verification loop */
/* Fixme: we might want to pass pin->min_length and
pin->stored_length */
rc = pincb (pincb_arg, pinobj->label, &pinvalue);
if (rc)
{
log_info ("PIN callback returned error: %s\n", gpg_strerror (rc));
return rc;
}
rc = sc_pkcs15_verify_pin (card->p15card, pin,
pinvalue, strlen (pinvalue));
xfree (pinvalue);
if (rc)
{
log_info ("PIN verification failed: %s\n", sc_strerror (rc));
return gpg_error (GPG_ERR_BAD_PIN);
}
/* fixme: check wheter we need to release KEYOBJ in case of an error */
*r_keyobj = keyobj;
return 0;
}
/* See card.c for interface description */
static int
p15_sign (CARD card, const char *keyidstr, int hashalgo,
int (pincb)(void*, const char *, char **),
void *pincb_arg,
const void *indata, size_t indatalen,
unsigned char **outdata, size_t *outdatalen )
{
unsigned int cryptflags;
struct sc_pkcs15_object *keyobj;
int rc;
unsigned char *outbuf = NULL;
size_t outbuflen;
if (hashalgo != GCRY_MD_SHA1)
return gpg_error (GPG_ERR_UNSUPPORTED_ALGORITHM);
rc = p15_prepare_key (card, keyidstr, pincb, pincb_arg, &keyobj);
if (rc)
return rc;
cryptflags = SC_ALGORITHM_RSA_PAD_PKCS1;
outbuflen = 1024;
outbuf = xtrymalloc (outbuflen);
if (!outbuf)
return gpg_error (gpg_err_code_from_errno (errno));
rc = sc_pkcs15_compute_signature (card->p15card, keyobj,
cryptflags,
indata, indatalen,
outbuf, outbuflen );
if (rc < 0)
{
log_error ("failed to create signature: %s\n", sc_strerror (rc));
rc = gpg_error (GPG_ERR_CARD);
}
else
{
*outdatalen = rc;
*outdata = outbuf;
outbuf = NULL;
rc = 0;
}
xfree (outbuf);
return rc;
}
/* See card.c for description */
static int
p15_decipher (CARD card, const char *keyidstr,
int (pincb)(void*, const char *, char **),
void *pincb_arg,
const void *indata, size_t indatalen,
unsigned char **outdata, size_t *outdatalen )
{
struct sc_pkcs15_object *keyobj;
int rc;
unsigned char *outbuf = NULL;
size_t outbuflen;
rc = p15_prepare_key (card, keyidstr, pincb, pincb_arg, &keyobj);
if (rc)
return rc;
if (card && card->scard && card->scard->driver
&& !strcasecmp (card->scard->driver->short_name, "tcos"))
{
/* very ugly hack to force the use of a local key. We need this
until we have fixed the initialization code for TCOS cards */
struct sc_pkcs15_prkey_info *prkey = keyobj->data;
if ( !(prkey->key_reference & 0x80))
{
prkey->key_reference |= 0x80;
log_debug ("using TCOS hack to force the use of local keys\n");
}
if (*keyidstr && keyidstr[strlen(keyidstr)-1] == '6')
{
prkey->key_reference |= 1;
log_debug ("warning: using even more TCOS hacks\n");
}
}
outbuflen = indatalen < 256? 256 : indatalen;
outbuf = xtrymalloc (outbuflen);
if (!outbuf)
return gpg_error (gpg_err_code_from_errno (errno));
rc = sc_pkcs15_decipher (card->p15card, keyobj,
0,
indata, indatalen,
outbuf, outbuflen);
if (rc < 0)
{
log_error ("failed to decipher the data: %s\n", sc_strerror (rc));
rc = gpg_error (GPG_ERR_CARD);
}
else
{
*outdatalen = rc;
*outdata = outbuf;
outbuf = NULL;
rc = 0;
}
xfree (outbuf);
return rc;
}
/* Bind our operations to the card */
void
card_p15_bind (CARD card)
{
card->fnc.enum_keypairs = p15_enum_keypairs;
card->fnc.enum_certs = p15_enum_certs;
card->fnc.read_cert = p15_read_cert;
card->fnc.sign = p15_sign;
card->fnc.decipher = p15_decipher;
}
#endif /*HAVE_OPENSC*/
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