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strongswan/src/pluto/smartcard.c

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/* Support of smartcards and cryptotokens
* Copyright (C) 2003 Christoph Gysin, Simon Zwahlen
* Copyright (C) 2004 David Buechi, Michael Meier
* Zuercher Hochschule Winterthur, Switzerland
*
* Copyright (C) 2005 Michael Joosten
*
* Copyright (C) 2005 Andreas Steffen
* Hochschule fuer Technik Rapperswil, Switzerland
*
* This program 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 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <dlfcn.h>
#include <freeswan.h>
#include <asn1/asn1.h>
#include <credentials/keys/public_key.h>
#include "constants.h"
#ifdef SMARTCARD
#include "rsaref/unix.h"
#include "rsaref/pkcs11.h"
#endif
#include "defs.h"
#include "log.h"
#include "x509.h"
#include "ca.h"
#include "certs.h"
#include "keys.h"
#include "smartcard.h"
#include "whack.h"
#include "fetch.h"
#define DEFAULT_BASE 16
/* chained list of smartcard records */
static smartcard_t *smartcards = NULL;
/* number of generated sc objects */
static int sc_number = 0;
const smartcard_t empty_sc = {
NULL , /* next */
0 , /* last_load */
{ CERT_NONE, {NULL} }, /* last_cert */
0 , /* count */
0 , /* number */
999999 , /* slot */
NULL , /* id */
NULL , /* label */
{ NULL, 0 } , /* pin */
FALSE , /* pinpad */
FALSE , /* valid */
FALSE , /* session_opened */
FALSE , /* logged_in */
TRUE , /* any_slot */
0L , /* session */
};
#ifdef SMARTCARD /* compile with smartcard support */
#define SCX_MAGIC 0xd00bed00
struct scx_pkcs11_module {
u_int _magic;
void *handle;
};
typedef struct scx_pkcs11_module scx_pkcs11_module_t;
/* PKCS #11 cryptoki context */
static bool scx_initialized = FALSE;
static scx_pkcs11_module_t *pkcs11_module = NULL_PTR;
static CK_FUNCTION_LIST_PTR pkcs11_functions = NULL_PTR;
/* crytoki v2.11 - return values of PKCS #11 functions*/
static const char *const pkcs11_return_name[] = {
"CKR_OK",
"CKR_CANCEL",
"CKR_HOST_MEMORY",
"CKR_SLOT_ID_INVALID",
"CKR_FLAGS_INVALID",
"CKR_GENERAL_ERROR",
"CKR_FUNCTION_FAILED",
"CKR_ARGUMENTS_BAD",
"CKR_NO_EVENT",
"CKR_NEED_TO_CREATE_THREADS",
"CKR_CANT_LOCK"
};
static const char *const pkcs11_return_name_10[] = {
"CKR_ATTRIBUTE_READ_ONLY",
"CKR_ATTRIBUTE_SENSITIVE",
"CKR_ATTRIBUTE_TYPE_INVALID",
"CKR_ATTRIBUTE_VALUE_INVALID"
};
static const char *const pkcs11_return_name_20[] = {
"CKR_DATA_INVALID",
"CKR_DATA_LEN_RANGE"
};
static const char *const pkcs11_return_name_30[] = {
"CKR_DEVICE_ERROR",
"CKR_DEVICE_MEMORY",
"CKR_DEVICE_REMOVED"
};
static const char *const pkcs11_return_name_40[] = {
"CKR_ENCRYPTED_DATA_INVALID",
"CKR_ENCRYPTED_DATA_LEN_RANGE"
};
static const char *const pkcs11_return_name_50[] = {
"CKR_FUNCTION_CANCELED",
"CKR_FUNCTION_NOT_PARALLEL",
"CKR_0x52_UNDEFINED",
"CKR_0x53_UNDEFINED",
"CKR_FUNCTION_NOT_SUPPORTED"
};
static const char *const pkcs11_return_name_60[] = {
"CKR_KEY_HANDLE_INVALID",
"CKR_KEY_SENSITIVE",
"CKR_KEY_SIZE_RANGE",
"CKR_KEY_TYPE_INCONSISTENT",
"CKR_KEY_NOT_NEEDED",
"CKR_KEY_CHANGED",
"CKR_KEY_NEEDED",
"CKR_KEY_INDIGESTIBLE",
"CKR_KEY_FUNCTION_NOT_PERMITTED",
"CKR_KEY_NOT_WRAPPABLE",
"CKR_KEY_UNEXTRACTABLE"
};
static const char *const pkcs11_return_name_70[] = {
"CKR_MECHANISM_INVALID",
"CKR_MECHANISM_PARAM_INVALID"
};
static const char *const pkcs11_return_name_80[] = {
"CKR_OBJECT_HANDLE_INVALID"
};
static const char *const pkcs11_return_name_90[] = {
"CKR_OPERATION_ACTIVE",
"CKR_OPERATION_NOT_INITIALIZED"
};
static const char *const pkcs11_return_name_A0[] = {
"CKR_PIN_INCORRECT",
"CKR_PIN_INVALID",
"CKR_PIN_LEN_RANGE",
"CKR_PIN_EXPIRED",
"CKR_PIN_LOCKED"
};
static const char *const pkcs11_return_name_B0[] = {
"CKR_SESSION_CLOSED",
"CKR_SESSION_COUNT",
"CKR_0xB2_UNDEFINED",
"CKR_SESSION_HANDLE_INVALID",
"CKR_SESSION_PARALLEL_NOT_SUPPORTED",
"CKR_SESSION_READ_ONLY",
"CKR_SESSION_EXISTS",
"CKR_SESSION_READ_ONLY_EXISTS",
"CKR_SESSION_READ_WRITE_SO_EXISTS"
};
static const char *const pkcs11_return_name_C0[] = {
"CKR_SIGNATURE_INVALID",
"CKR_SIGNATURE_LEN_RANGE"
};
static const char *const pkcs11_return_name_D0[] = {
"CKR_TEMPLATE_INCOMPLETE",
"CKR_TEMPLATE_INCONSISTENT"
};
static const char *const pkcs11_return_name_E0[] = {
"CKR_TOKEN_NOT_PRESENT",
"CKR_TOKEN_NOT_RECOGNIZED",
"CKR_TOKEN_WRITE_PROTECTED"
};
static const char *const pkcs11_return_name_F0[] = {
"CKR_UNWRAPPING_KEY_HANDLE_INVALID",
"CKR_UNWRAPPING_KEY_SIZE_RANGE",
"CKR_UNWRAPPING_KEY_TYPE_INCONSISTENT"
};
static const char *const pkcs11_return_name_100[] = {
"CKR_USER_ALREADY_LOGGED_IN",
"CKR_USER_NOT_LOGGED_IN",
"CKR_USER_PIN_NOT_INITIALIZED",
"CKR_USER_TYPE_INVALID",
"CKR_USER_ANOTHER_ALREADY_LOGGED_IN",
"CKR_USER_TOO_MANY_TYPES"
};
static const char *const pkcs11_return_name_110[] = {
"CKR_WRAPPED_KEY_INVALID",
"CKR_0x111_UNDEFINED",
"CKR_WRAPPED_KEY_LEN_RANGE",
"CKR_WRAPPING_KEY_HANDLE_INVALID",
"CKR_WRAPPING_KEY_SIZE_RANGE",
"CKR_WRAPPING_KEY_TYPE_INCONSISTENT"
};
static const char *const pkcs11_return_name_120[] = {
"CKR_RANDOM_SEED_NOT_SUPPORTED",
"CKR_RANDOM_NO_RNG"
};
static const char *const pkcs11_return_name_130[] = {
"CKR_DOMAIN_PARAMS_INVALID"
};
static const char *const pkcs11_return_name_150[] = {
"CKR_BUFFER_TOO_SMALL"
};
static const char *const pkcs11_return_name_160[] = {
"CKR_SAVED_STATE_INVALID"
};
static const char *const pkcs11_return_name_170[] = {
"CKR_INFORMATION_SENSITIVE"
};
static const char *const pkcs11_return_name_180[] = {
"CKR_STATE_UNSAVEABLE"
};
static const char *const pkcs11_return_name_190[] = {
"CKR_CRYPTOKI_NOT_INITIALIZED",
"CKR_CRYPTOKI_ALREADY_INITIALIZED"
};
static const char *const pkcs11_return_name_1A0[] = {
"CKR_MUTEX_BAD",
"CKR_MUTEX_NOT_LOCKED"
};
static const char *const pkcs11_return_name_200[] = {
"CKR_FUNCTION_REJECTED"
};
static const char *const pkcs11_return_name_vendor[] = {
"CKR_VENDOR_DEFINED"
};
static enum_names pkcs11_return_names_vendor =
{ CKR_VENDOR_DEFINED, CKR_VENDOR_DEFINED
, pkcs11_return_name_vendor, NULL };
static enum_names pkcs11_return_names_200 =
{ CKR_FUNCTION_REJECTED, CKR_FUNCTION_REJECTED
, pkcs11_return_name_200, &pkcs11_return_names_vendor };
static enum_names pkcs11_return_names_1A0 =
{ CKR_MUTEX_BAD, CKR_MUTEX_NOT_LOCKED
, pkcs11_return_name_1A0, &pkcs11_return_names_200 };
static enum_names pkcs11_return_names_190 =
{ CKR_CRYPTOKI_NOT_INITIALIZED, CKR_CRYPTOKI_ALREADY_INITIALIZED
, pkcs11_return_name_190, &pkcs11_return_names_1A0 };
static enum_names pkcs11_return_names_180 =
{ CKR_STATE_UNSAVEABLE, CKR_STATE_UNSAVEABLE
, pkcs11_return_name_180, &pkcs11_return_names_190 };
static enum_names pkcs11_return_names_170 =
{ CKR_INFORMATION_SENSITIVE, CKR_INFORMATION_SENSITIVE
, pkcs11_return_name_170, &pkcs11_return_names_180 };
static enum_names pkcs11_return_names_160 =
{ CKR_SAVED_STATE_INVALID, CKR_SAVED_STATE_INVALID
, pkcs11_return_name_160, &pkcs11_return_names_170 };
static enum_names pkcs11_return_names_150 =
{ CKR_BUFFER_TOO_SMALL, CKR_BUFFER_TOO_SMALL
, pkcs11_return_name_150, &pkcs11_return_names_160 };
static enum_names pkcs11_return_names_130 =
{ CKR_DOMAIN_PARAMS_INVALID, CKR_DOMAIN_PARAMS_INVALID
, pkcs11_return_name_130, &pkcs11_return_names_150 };
static enum_names pkcs11_return_names_120 =
{ CKR_RANDOM_SEED_NOT_SUPPORTED, CKR_RANDOM_NO_RNG
, pkcs11_return_name_120, &pkcs11_return_names_130 };
static enum_names pkcs11_return_names_110 =
{ CKR_WRAPPED_KEY_INVALID, CKR_WRAPPING_KEY_TYPE_INCONSISTENT
, pkcs11_return_name_110, &pkcs11_return_names_120 };
static enum_names pkcs11_return_names_100 =
{ CKR_USER_ALREADY_LOGGED_IN, CKR_USER_TOO_MANY_TYPES
, pkcs11_return_name_100, &pkcs11_return_names_110 };
static enum_names pkcs11_return_names_F0 =
{ CKR_UNWRAPPING_KEY_HANDLE_INVALID, CKR_UNWRAPPING_KEY_TYPE_INCONSISTENT
, pkcs11_return_name_F0, &pkcs11_return_names_100 };
static enum_names pkcs11_return_names_E0 =
{ CKR_TOKEN_NOT_PRESENT, CKR_TOKEN_WRITE_PROTECTED
, pkcs11_return_name_E0, &pkcs11_return_names_F0 };
static enum_names pkcs11_return_names_D0 =
{ CKR_TEMPLATE_INCOMPLETE, CKR_TEMPLATE_INCONSISTENT
, pkcs11_return_name_D0,&pkcs11_return_names_E0 };
static enum_names pkcs11_return_names_C0 =
{ CKR_SIGNATURE_INVALID, CKR_SIGNATURE_LEN_RANGE
, pkcs11_return_name_C0, &pkcs11_return_names_D0 };
static enum_names pkcs11_return_names_B0 =
{ CKR_SESSION_CLOSED, CKR_SESSION_READ_WRITE_SO_EXISTS
, pkcs11_return_name_B0, &pkcs11_return_names_C0 };
static enum_names pkcs11_return_names_A0 =
{ CKR_PIN_INCORRECT, CKR_PIN_LOCKED
, pkcs11_return_name_A0, &pkcs11_return_names_B0 };
static enum_names pkcs11_return_names_90 =
{ CKR_OPERATION_ACTIVE, CKR_OPERATION_NOT_INITIALIZED
, pkcs11_return_name_90, &pkcs11_return_names_A0 };
static enum_names pkcs11_return_names_80 =
{ CKR_OBJECT_HANDLE_INVALID, CKR_OBJECT_HANDLE_INVALID
, pkcs11_return_name_80, &pkcs11_return_names_90 };
static enum_names pkcs11_return_names_70 =
{ CKR_MECHANISM_INVALID, CKR_MECHANISM_PARAM_INVALID
, pkcs11_return_name_70, &pkcs11_return_names_80 };
static enum_names pkcs11_return_names_60 =
{ CKR_KEY_HANDLE_INVALID, CKR_KEY_UNEXTRACTABLE
, pkcs11_return_name_60, &pkcs11_return_names_70 };
static enum_names pkcs11_return_names_50 =
{ CKR_FUNCTION_CANCELED, CKR_FUNCTION_NOT_SUPPORTED
, pkcs11_return_name_50, &pkcs11_return_names_60 };
static enum_names pkcs11_return_names_40 =
{ CKR_ENCRYPTED_DATA_INVALID, CKR_ENCRYPTED_DATA_LEN_RANGE
, pkcs11_return_name_40, &pkcs11_return_names_50 };
static enum_names pkcs11_return_names_30 =
{ CKR_DEVICE_ERROR, CKR_DEVICE_REMOVED
, pkcs11_return_name_30, &pkcs11_return_names_40 };
static enum_names pkcs11_return_names_20 =
{ CKR_DATA_INVALID, CKR_DATA_LEN_RANGE
, pkcs11_return_name_20, &pkcs11_return_names_30 };
static enum_names pkcs11_return_names_10 =
{ CKR_ATTRIBUTE_READ_ONLY, CKR_ATTRIBUTE_VALUE_INVALID
, pkcs11_return_name_10, &pkcs11_return_names_20};
static enum_names pkcs11_return_names =
{ CKR_OK, CKR_CANT_LOCK
, pkcs11_return_name, &pkcs11_return_names_10};
/*
* Unload a PKCS#11 module.
* The calling application is responsible for cleaning up
* and calling C_Finalize()
*/
static CK_RV
scx_unload_pkcs11_module(scx_pkcs11_module_t *mod)
{
if (!mod || mod->_magic != SCX_MAGIC)
return CKR_ARGUMENTS_BAD;
if (dlclose(mod->handle) < 0)
return CKR_FUNCTION_FAILED;
memset(mod, 0, sizeof(*mod));
free(mod);
return CKR_OK;
}
static scx_pkcs11_module_t*
scx_load_pkcs11_module(const char *name, CK_FUNCTION_LIST_PTR_PTR funcs)
{
CK_RV (*c_get_function_list)(CK_FUNCTION_LIST_PTR_PTR);
scx_pkcs11_module_t *mod;
void *handle;
int rv;
if (name == NULL || *name == '\0')
return NULL;
/* Try to load PKCS#11 library module*/
handle = dlopen(name, RTLD_NOW);
if (handle == NULL)
return NULL;
mod = malloc_thing(scx_pkcs11_module_t);
mod->_magic = SCX_MAGIC;
mod->handle = handle;
/* Get the list of function pointers */
c_get_function_list = (CK_RV (*)(CK_FUNCTION_LIST_PTR_PTR))
dlsym(mod->handle, "C_GetFunctionList");
if (!c_get_function_list)
goto failed;
rv = c_get_function_list(funcs);
if (rv == CKR_OK)
return mod;
failed: scx_unload_pkcs11_module(mod);
return NULL;
}
/*
* retrieve a certificate object
*/
static bool
scx_find_cert_object(CK_SESSION_HANDLE session, CK_OBJECT_HANDLE object
, smartcard_t *sc, cert_t *cert)
{
size_t hex_len, label_len;
u_char *hex_id = NULL;
chunk_t blob;
x509cert_t *x509cert;
CK_ATTRIBUTE attr[] = {
{ CKA_ID, NULL_PTR, 0L },
{ CKA_LABEL, NULL_PTR, 0L },
{ CKA_VALUE, NULL_PTR, 0L }
};
/* initialize the return argument */
*cert = cert_empty;
/* get the length of the attributes first */
CK_RV rv = pkcs11_functions->C_GetAttributeValue(session, object, attr, 3);
if (rv != CKR_OK)
{
plog("couldn't read the attribute sizes: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
free(sc->label);
hex_id = malloc(attr[0].ulValueLen);
hex_len = attr[0].ulValueLen;
sc->label = malloc(attr[1].ulValueLen + 1);
label_len = attr[1].ulValueLen;
blob.ptr = malloc(attr[2].ulValueLen);
blob.len = attr[2].ulValueLen;
attr[0].pValue = hex_id;
attr[1].pValue = sc->label;
attr[2].pValue = blob.ptr;
/* now get the attributes */
rv = pkcs11_functions->C_GetAttributeValue(session, object, attr, 3);
if (rv != CKR_OK)
{
plog("couldn't read the attributes: %s"
, enum_show(&pkcs11_return_names, rv));
free(hex_id);
free(sc->label);
free(blob.ptr);
return FALSE;
}
free(sc->id);
/* convert id from hex to ASCII */
sc->id = malloc(2*hex_len + 1);
datatot(hex_id, hex_len, 16, sc->id, 2*hex_len + 1);
free(hex_id);
/* safeguard in case the label is not null terminated */
sc->label[label_len] = '\0';
/* parse the retrieved cert */
x509cert = malloc_thing(x509cert_t);
*x509cert = empty_x509cert;
x509cert->smartcard = TRUE;
if (!parse_x509cert(blob, 0, x509cert))
{
plog("failed to load cert from smartcard, error in X.509 certificate");
free_x509cert(x509cert);
return FALSE;
}
cert->type = CERT_X509_SIGNATURE;
cert->u.x509 = x509cert;
return TRUE;
}
/*
* search a given slot for PKCS#11 certificate objects
*/
static void
scx_find_cert_objects(CK_SLOT_ID slot, CK_SESSION_HANDLE session)
{
CK_RV rv;
CK_OBJECT_CLASS class = CKO_CERTIFICATE;
CK_ATTRIBUTE attr[] = {{ CKA_CLASS, &class, sizeof(class) }};
rv = pkcs11_functions->C_FindObjectsInit(session, attr, 1);
if (rv != CKR_OK)
{
plog("error in C_FindObjectsInit: %s"
, enum_show(&pkcs11_return_names, rv));
return;
}
for (;;)
{
CK_OBJECT_HANDLE object;
CK_ULONG obj_count = 0;
err_t ugh;
time_t valid_until;
smartcard_t *sc;
x509cert_t *cert;
rv = pkcs11_functions->C_FindObjects(session, &object, 1, &obj_count);
if (rv != CKR_OK)
{
plog("error in C_FindObjects: %s"
, enum_show(&pkcs11_return_names, rv));
break;
}
/* no objects left */
if (obj_count == 0)
break;
/* create and initialize a new smartcard object */
sc = malloc_thing(smartcard_t);
*sc = empty_sc;
sc->any_slot = FALSE;
sc->slot = slot;
if (!scx_find_cert_object(session, object, sc, &sc->last_cert))
{
scx_free(sc);
continue;
}
DBG(DBG_CONTROL,
DBG_log("found cert in %s with id: %s, label: '%s'"
, scx_print_slot(sc, ""), sc->id, sc->label)
)
/* check validity of certificate */
cert = sc->last_cert.u.x509;
valid_until = cert->notAfter;
ugh = check_validity(cert, &valid_until);
if (ugh != NULL)
{
plog(" %s", ugh);
free_x509cert(cert);
scx_free(sc);
continue;
}
else
{
DBG(DBG_CONTROL,
DBG_log(" certificate is valid")
)
}
sc = scx_add(sc);
/* put end entity and ca certificates into different chains */
if (cert->isCA)
{
sc->last_cert.u.x509 = add_authcert(cert, AUTH_CA);
}
else
{
add_x509_public_key(cert, valid_until, DAL_LOCAL);
sc->last_cert.u.x509 = add_x509cert(cert);
}
share_cert(sc->last_cert);
time(&sc->last_load);
}
rv = pkcs11_functions->C_FindObjectsFinal(session);
if (rv != CKR_OK)
{
plog("error in C_FindObjectsFinal: %s"
, enum_show(&pkcs11_return_names, rv));
}
}
/*
* search all slots for PKCS#11 certificate objects
*/
static void
scx_find_all_cert_objects(void)
{
CK_RV rv;
CK_SLOT_ID_PTR slots = NULL_PTR;
CK_ULONG slot_count = 0;
CK_ULONG i;
if (!scx_initialized)
{
plog("pkcs11 module not initialized");
return;
}
/* read size, always returns CKR_OK ! */
rv = pkcs11_functions->C_GetSlotList(FALSE, NULL_PTR, &slot_count);
/* allocate memory for the slots */
slots = (CK_SLOT_ID *)malloc(slot_count * sizeof(CK_SLOT_ID));
rv = pkcs11_functions->C_GetSlotList(FALSE, slots, &slot_count);
if (rv != CKR_OK)
{
plog("error in C_GetSlotList: %s", enum_show(&pkcs11_return_names, rv));
free(slots);
return;
}
/* look in every slot for certificate objects */
for (i = 0; i < slot_count; i++)
{
CK_SLOT_ID slot = slots[i];
CK_SLOT_INFO info;
CK_SESSION_HANDLE session;
rv = pkcs11_functions->C_GetSlotInfo(slot, &info);
if (rv != CKR_OK)
{
plog("error in C_GetSlotInfo: %s"
, enum_show(&pkcs11_return_names, rv));
continue;
}
if (!(info.flags & CKF_TOKEN_PRESENT))
{
plog("no token present in slot %lu", slot);
continue;
}
rv = pkcs11_functions->C_OpenSession(slot
, CKF_SERIAL_SESSION, NULL_PTR, NULL_PTR, &session);
if (rv != CKR_OK)
{
plog("failed to open a session on slot %lu: %s"
, slot, enum_show(&pkcs11_return_names, rv));
continue;
}
DBG(DBG_CONTROLMORE,
DBG_log("pkcs11 session #%ld for searching slot %lu", session, slot)
)
scx_find_cert_objects(slot, session);
rv = pkcs11_functions->C_CloseSession(session);
if (rv != CKR_OK)
{
plog("error in C_CloseSession: %s"
, enum_show(&pkcs11_return_names, rv));
}
}
free(slots);
}
#endif
/*
* load and initialize PKCS#11 cryptoki module
*
* init_args should be unused when we have a PKCS#11 compliant module,
* but NSS softoken breaks that API.
*/
void
scx_init(const char* module, const char *init_args)
{
#ifdef SMARTCARD
CK_C_INITIALIZE_ARGS args = { .pReserved = (char *)init_args, };
CK_RV rv;
if (scx_initialized)
{
plog("weird - pkcs11 module seems already to be initialized");
return;
}
if (module == NULL)
#ifdef PKCS11_DEFAULT_LIB
module = PKCS11_DEFAULT_LIB;
#else
{
plog("no pkcs11 module defined");
return;
}
#endif
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log("pkcs11 module '%s' loading...", module)
)
pkcs11_module = scx_load_pkcs11_module(module, &pkcs11_functions);
if (pkcs11_module == NULL)
{
plog("failed to load pkcs11 module '%s'", module);
return;
}
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log("pkcs11 module initializing...")
)
rv = pkcs11_functions->C_Initialize(init_args ? &args : NULL);
if (rv != CKR_OK)
{
plog("failed to initialize pkcs11 module: %s"
, enum_show(&pkcs11_return_names, rv));
return;
}
scx_initialized = TRUE;
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log("pkcs11 module loaded and initialized")
)
scx_find_all_cert_objects();
#endif
}
/*
* finalize and unload PKCS#11 cryptoki module
*/
void
scx_finalize(void)
{
#ifdef SMARTCARD
while (smartcards != NULL)
{
scx_release(smartcards);
}
if (pkcs11_functions != NULL_PTR)
{
pkcs11_functions->C_Finalize(NULL_PTR);
pkcs11_functions = NULL_PTR;
}
if (pkcs11_module != NULL)
{
scx_unload_pkcs11_module(pkcs11_module);
pkcs11_module = NULL;
}
scx_initialized = FALSE;
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log("pkcs11 module finalized and unloaded")
)
#endif
}
/*
* does a filename contain the token %smartcard?
*/
bool
scx_on_smartcard(const char *filename)
{
return strneq(filename, SCX_TOKEN, strlen(SCX_TOKEN));
}
#ifdef SMARTCARD
/*
* find a specific object on the smartcard
*/
static bool
scx_pkcs11_find_object( CK_SESSION_HANDLE session,
CK_OBJECT_HANDLE_PTR object,
CK_OBJECT_CLASS class,
const char* id)
{
size_t len;
char buf[BUF_LEN];
CK_RV rv;
CK_ULONG obj_count = 0;
CK_ULONG attr_count = 1;
CK_ATTRIBUTE attr[] = {
{ CKA_CLASS, &class, sizeof(class) },
{ CKA_ID, &buf, 0L }
};
if (id != NULL)
{
ttodata(id, strlen(id), 16, buf, BUF_LEN, &len);
attr[1].ulValueLen = len;
attr_count = 2;
}
/* get info for certificate with id */
rv = pkcs11_functions->C_FindObjectsInit(session, attr, attr_count);
if (rv != CKR_OK)
{
plog("error in C_FindObjectsInit: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
rv = pkcs11_functions->C_FindObjects(session, object, 1, &obj_count);
if (rv != CKR_OK)
{
plog("error in C_FindObjects: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
rv = pkcs11_functions->C_FindObjectsFinal(session);
if (rv != CKR_OK)
{
plog("error in C_FindObjectsFinal: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
return (obj_count != 0);
}
/*
* check if a given certificate object id is found in a slot
*/
static bool
scx_find_cert_id_in_slot(smartcard_t *sc, CK_SLOT_ID slot)
{
CK_SESSION_HANDLE session;
CK_OBJECT_HANDLE object;
CK_SLOT_INFO info;
CK_RV rv = pkcs11_functions->C_GetSlotInfo(slot, &info);
if (rv != CKR_OK)
{
plog("error in C_GetSlotInfo: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
if (!(info.flags & CKF_TOKEN_PRESENT))
{
plog("no token present in slot %lu", slot);
return FALSE;
}
rv = pkcs11_functions->C_OpenSession(slot
, CKF_SERIAL_SESSION, NULL_PTR, NULL_PTR, &session);
if (rv != CKR_OK)
{
plog("failed to open a session on slot %lu: %s"
, slot, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
DBG(DBG_CONTROLMORE,
DBG_log("pkcs11 session #%ld for searching slot %lu", session, slot)
)
/* check if there is a certificate on the card in the specified slot */
if (scx_pkcs11_find_object(session, &object, CKO_CERTIFICATE, sc->id))
{
sc->slot = slot;
sc->any_slot = FALSE;
sc->session = session;
sc->session_opened = TRUE;
return TRUE;
}
rv = pkcs11_functions->C_CloseSession(session);
if (rv != CKR_OK)
{
plog("error in C_CloseSession: %s"
, enum_show(&pkcs11_return_names, rv));
}
return FALSE;
}
#endif
/*
* Connect to the smart card in the reader and select the correct slot
*/
bool
scx_establish_context(smartcard_t *sc)
{
#ifdef SMARTCARD
bool id_found = FALSE;
if (!scx_initialized)
{
plog("pkcs11 module not initialized");
return FALSE;
}
if (sc->session_opened)
{
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log("pkcs11 session #%ld already open", sc->session)
)
return TRUE;
}
if (!sc->any_slot)
id_found = scx_find_cert_id_in_slot(sc, sc->slot);
if (!id_found)
{
CK_RV rv;
CK_SLOT_ID slot;
CK_SLOT_ID_PTR slots = NULL_PTR;
CK_ULONG slot_count = 0;
CK_ULONG i;
/* read size, always returns CKR_OK ! */
rv = pkcs11_functions->C_GetSlotList(FALSE, NULL_PTR, &slot_count);
/* allocate memory for the slots */
slots = (CK_SLOT_ID *)malloc(slot_count * sizeof(CK_SLOT_ID));
rv = pkcs11_functions->C_GetSlotList(FALSE, slots, &slot_count);
if (rv != CKR_OK)
{
plog("error in C_GetSlotList: %s"
, enum_show(&pkcs11_return_names, rv));
free(slots);
return FALSE;
}
/* look in every slot for a certificate with a given object ID */
for (i = 0; i < slot_count; i++)
{
slot = slots[i];
id_found = scx_find_cert_id_in_slot(sc, slot);
if (id_found)
break;
}
free(slots);
}
if (id_found)
{
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log("found token with id %s in slot %lu", sc->id, sc->slot);
DBG_log("pkcs11 session #%ld opened", sc->session)
)
}
else
{
plog(" no certificate with id %s found on smartcard", sc->id);
}
return id_found;
#else
plog("warning: SMARTCARD support is deactivated in pluto/Makefile!");
return FALSE;
#endif
}
/*
* log in to a session
*/
bool
scx_login(smartcard_t *sc)
{
#ifdef SMARTCARD
CK_RV rv;
if (sc->logged_in)
{
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log("pkcs11 session #%ld login already done", sc->session)
)
return TRUE;
}
if (sc->pin.ptr == NULL)
{
plog("unable to log in without PIN!");
return FALSE;
}
if (!sc->session_opened)
{
plog("session not opened");
return FALSE;
}
rv = pkcs11_functions->C_Login(sc->session, CKU_USER
, (CK_UTF8CHAR *) sc->pin.ptr, sc->pin.len);
if (rv != CKR_OK && rv != CKR_USER_ALREADY_LOGGED_IN)
{
plog("unable to login: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log("pkcs11 session #%ld login successful", sc->session)
)
sc->logged_in = TRUE;
return TRUE;
#else
return FALSE;
#endif
}
#ifdef SMARTCARD
/*
* logout from a session
*/
static void
scx_logout(smartcard_t *sc)
{
CK_RV rv;
rv = pkcs11_functions->C_Logout(sc->session);
if (rv != CKR_OK)
plog("error in C_Logout: %s"
, enum_show(&pkcs11_return_names, rv));
else
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log("pkcs11 session #%ld logout", sc->session)
)
sc->logged_in = FALSE;
}
#endif
/*
* Release context and disconnect from card
*/
void
scx_release_context(smartcard_t *sc)
{
#ifdef SMARTCARD
CK_RV rv;
if (!scx_initialized)
return;
if (sc->session_opened)
{
if (sc->logged_in)
scx_logout(sc);
sc->session_opened = FALSE;
rv = pkcs11_functions->C_CloseSession(sc->session);
if (rv != CKR_OK)
plog("error in C_CloseSession: %s"
, enum_show(&pkcs11_return_names, rv));
else
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log("pkcs11 session #%ld closed", sc->session)
)
}
#endif
}
/*
* Load host certificate from smartcard
*/
bool
scx_load_cert(const char *filename, smartcard_t **scp, cert_t *cert
, bool *cached)
{
#ifdef SMARTCARD /* compile with smartcard support */
CK_OBJECT_HANDLE object;
const char *number_slot_id = filename + strlen(SCX_TOKEN);
smartcard_t *sc = scx_add(scx_parse_number_slot_id(number_slot_id));
/* return the smartcard object */
*scp = sc;
/* is there a cached smartcard certificate? */
*cached = sc->last_cert.type != CERT_NONE
&& (time(NULL) - sc->last_load) < SCX_CERT_CACHE_INTERVAL;
if (*cached)
{
*cert = sc->last_cert;
plog(" using cached cert from smartcard #%d (%s, id: %s, label: '%s')"
, sc->number
, scx_print_slot(sc, "")
, sc->id
, sc->label);
return TRUE;
}
if (!scx_establish_context(sc))
{
scx_release_context(sc);
return FALSE;
}
/* find the certificate object */
if (!scx_pkcs11_find_object(sc->session, &object, CKO_CERTIFICATE, sc->id))
{
scx_release_context(sc);
return FALSE;
}
/* retrieve the certificate object */
if (!scx_find_cert_object(sc->session, object, sc, cert))
{
scx_release_context(sc);
return FALSE;
}
if (!pkcs11_keep_state)
scx_release_context(sc);
plog(" loaded cert from smartcard #%d (%s, id: %s, label: '%s')"
, sc->number
, scx_print_slot(sc, "")
, sc->id
, sc->label);
return TRUE;
#else
plog(" warning: SMARTCARD support is deactivated in pluto/Makefile!");
return FALSE;
#endif
}
/*
* parse slot number and key id
* the following syntax is allowed
* number slot id
* %smartcard 1 - -
* %smartcard#2 2 - -
* %smartcard0 - 0 -
* %smartcard:45 - - 45
* %smartcard0:45 - 0 45
*/
smartcard_t*
scx_parse_number_slot_id(const char *number_slot_id)
{
int len = strlen(number_slot_id);
smartcard_t *sc = malloc_thing(smartcard_t);
/* assign default values */
*sc = empty_sc;
if (len == 0) /* default: use certificate #1 */
{
sc->number = 1;
}
else if (*number_slot_id == '#') /* #number scheme */
{
err_t ugh;
unsigned long ul;
ugh = atoul(number_slot_id+1, len-1 , 10, &ul);
if (ugh == NULL)
sc->number = (int)ul;
else
plog("error parsing smartcard number: %s", ugh);
}
else /* slot:id scheme */
{
int slot_len = len;
char *p = strchr(number_slot_id, ':');
if (p != NULL)
{
int id_len = len - (p + 1 - number_slot_id);
slot_len -= (1 + id_len);
if (id_len > 0) /* we have an id */
sc->id = p + 1;
}
if (slot_len > 0) /* we have a slot */
{
err_t ugh = NULL;
unsigned long ul;
ugh = atoul(number_slot_id, slot_len, 10, &ul);
if (ugh == NULL)
{
sc->slot = ul;
sc->any_slot = FALSE;
}
else
plog("error parsing smartcard slot number: %s", ugh);
}
}
/* unshare the id string */
sc->id = clone_str(sc->id);
return sc;
}
/*
* Verify pin on card
*/
bool
scx_verify_pin(smartcard_t *sc)
{
#ifdef SMARTCARD
CK_RV rv;
if (!sc->pinpad)
sc->valid = FALSE;
if (sc->pin.ptr == NULL)
{
plog("unable to verify without PIN");
return FALSE;
}
/* establish context */
if (!scx_establish_context(sc))
{
scx_release_context(sc);
return FALSE;
}
rv = pkcs11_functions->C_Login(sc->session, CKU_USER,
(CK_UTF8CHAR *) sc->pin.ptr, sc->pin.len);
if (rv == CKR_OK || rv == CKR_USER_ALREADY_LOGGED_IN)
{
sc->valid = TRUE;
sc->logged_in = TRUE;
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log((rv == CKR_OK)
? "PIN code correct"
: "already logged in, no PIN entry required");
DBG_log("pkcs11 session #%ld login successful", sc->session)
)
}
else
{
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log("PIN code incorrect")
)
}
if (!pkcs11_keep_state)
scx_release_context(sc);
#else
sc->valid = FALSE;
#endif
return sc->valid;
}
/*
* Sign hash on smartcard
*/
bool
scx_sign_hash(smartcard_t *sc, const u_char *in, size_t inlen
, u_char *out, size_t outlen)
{
#ifdef SMARTCARD
CK_RV rv;
CK_OBJECT_HANDLE object;
CK_ULONG siglen = (CK_ULONG)outlen;
CK_BBOOL sign_flag, decrypt_flag;
CK_ATTRIBUTE attr[] = {
{ CKA_SIGN, &sign_flag, sizeof(sign_flag) },
{ CKA_DECRYPT, &decrypt_flag, sizeof(decrypt_flag) }
};
if (!sc->logged_in)
return FALSE;
if (!scx_pkcs11_find_object(sc->session, &object, CKO_PRIVATE_KEY, sc->id))
{
plog("unable to find private key with id '%s'", sc->id);
return FALSE;
}
rv = pkcs11_functions->C_GetAttributeValue(sc->session, object, attr, 2);
if (rv != CKR_OK)
{
plog("couldn't read the private key attributes: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
DBG(DBG_CONTROL,
DBG_log("RSA key flags: sign = %s, decrypt = %s"
, (sign_flag)? "true":"false"
, (decrypt_flag)? "true":"false")
)
if (sign_flag)
{
CK_MECHANISM mech = { CKM_RSA_PKCS, NULL_PTR, 0 };
rv = pkcs11_functions->C_SignInit(sc->session, &mech, object);
if (rv != CKR_OK)
{
plog("error in C_SignInit: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
rv = pkcs11_functions->C_Sign(sc->session, (CK_BYTE_PTR)in, inlen
, out, &siglen);
if (rv != CKR_OK)
{
plog("error in C_Sign: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
}
else if (decrypt_flag)
{
CK_MECHANISM mech = { CKM_RSA_X_509, NULL_PTR, 0 };
size_t padlen;
u_char *p = out ;
/* PKCS#1 v1.5 8.1 encryption-block formatting */
*p++ = 0x00;
*p++ = 0x01; /* BT (block type) 01 */
padlen = outlen - 3 - inlen;
memset(p, 0xFF, padlen);
p += padlen;
*p++ = 0x00;
memcpy(p, in, inlen);
rv = pkcs11_functions->C_DecryptInit(sc->session, &mech, object);
if (rv != CKR_OK)
{
plog("error in C_DecryptInit: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
rv = pkcs11_functions->C_Decrypt(sc->session, out, outlen
, out, &siglen);
if (rv != CKR_OK)
{
plog("error in C_Decrypt: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
}
else
{
plog("private key has neither sign nor decrypt flag set");
return FALSE;
}
if (siglen > (CK_ULONG)outlen)
{
plog("signature length (%lu) larger than allocated buffer (%d)"
, siglen, (int)outlen);
return FALSE;
}
return TRUE;
#else
return FALSE;
#endif
}
/*
* encrypt data block with an RSA public key
*/
bool
scx_encrypt(smartcard_t *sc, const u_char *in, size_t inlen
, u_char *out, size_t *outlen)
{
#ifdef SMARTCARD
CK_RV rv;
CK_OBJECT_HANDLE object;
CK_ULONG len = (CK_ULONG)(*outlen);
CK_BBOOL encrypt_flag;
CK_ATTRIBUTE attr[] = {
{ CKA_MODULUS, NULL_PTR, 0L },
{ CKA_PUBLIC_EXPONENT, NULL_PTR, 0L },
{ CKA_ENCRYPT, &encrypt_flag, sizeof(encrypt_flag) }
};
CK_MECHANISM mech = { CKM_RSA_PKCS, NULL_PTR, 0 };
if (!scx_establish_context(sc))
{
scx_release_context(sc);
return FALSE;
}
if (!scx_pkcs11_find_object(sc->session, &object, CKO_PUBLIC_KEY, sc->id))
{
plog("unable to find public key with id '%s'", sc->id);
return FALSE;
}
rv = pkcs11_functions->C_GetAttributeValue(sc->session, object, attr, 3);
if (rv != CKR_OK)
{
plog("couldn't read the public key attributes: %s"
, enum_show(&pkcs11_return_names, rv));
scx_release_context(sc);
return FALSE;
}
if (!encrypt_flag)
{
plog("public key cannot be used for encryption");
scx_release_context(sc);
return FALSE;
}
/* there must be enough space left for the PKCS#1 v1.5 padding */
if (inlen > attr[0].ulValueLen - 11)
{
plog("smartcard input data length (%d) exceeds maximum of %lu bytes"
, (int)inlen, attr[0].ulValueLen - 11);
if (!pkcs11_keep_state)
scx_release_context(sc);
return FALSE;
}
rv = pkcs11_functions->C_EncryptInit(sc->session, &mech, object);
if (rv != CKR_OK)
{
if (rv == CKR_FUNCTION_NOT_SUPPORTED)
{
public_key_t *key;
chunk_t rsa_modulus, rsa_exponent, rsa_key, cipher_text;
chunk_t plain_text = {(u_char*)in, inlen};
DBG(DBG_CONTROL,
DBG_log("doing RSA encryption in software")
)
attr[0].pValue = malloc(attr[0].ulValueLen);
attr[1].pValue = malloc(attr[1].ulValueLen);
rv = pkcs11_functions->C_GetAttributeValue(sc->session, object, attr, 2);
if (rv != CKR_OK)
{
plog("couldn't read modulus and public exponent: %s"
, enum_show(&pkcs11_return_names, rv));
free(attr[0].pValue);
free(attr[1].pValue);
scx_release_context(sc);
return FALSE;
}
rsa_modulus = chunk_create((u_char*) attr[0].pValue,
(size_t) attr[0].ulValueLen);
rsa_exponent = chunk_create((u_char*) attr[1].pValue,
(size_t) attr[1].ulValueLen);
rsa_key = asn1_wrap(ASN1_SEQUENCE, "mm",
asn1_integer("m", rsa_modulus),
asn1_integer("m", rsa_exponent));
key = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_RSA,
BUILD_BLOB_ASN1_DER, rsa_key, BUILD_END);
free(rsa_key.ptr);
if (key == NULL)
{
return FALSE;
}
key->encrypt(key, plain_text, &cipher_text);
key->destroy(key);
if (cipher_text.ptr == NULL)
{
plog("smartcard input data length is too large");
if (!pkcs11_keep_state)
{
scx_release_context(sc);
}
return FALSE;
}
memcpy(out, cipher_text.ptr, cipher_text.len);
*outlen = cipher_text.len;
free(cipher_text.ptr);
if (!pkcs11_keep_state)
{
scx_release_context(sc);
}
return TRUE;
}
else
{
plog("error in C_EncryptInit: %s"
, enum_show(&pkcs11_return_names, rv));
scx_release_context(sc);
return FALSE;
}
}
DBG(DBG_CONTROL,
DBG_log("doing RSA encryption on smartcard")
)
rv = pkcs11_functions->C_Encrypt(sc->session, (u_char*)in, inlen
, out, &len);
if (rv != CKR_OK)
{
plog("error in C_Encrypt: %s"
, enum_show(&pkcs11_return_names, rv));
scx_release_context(sc);
return FALSE;
}
if (!pkcs11_keep_state)
scx_release_context(sc);
*outlen = (size_t)len;
return TRUE;
#else
return FALSE;
#endif
}
/*
* decrypt a data block with an RSA private key
*/
bool
scx_decrypt(smartcard_t *sc, const u_char *in, size_t inlen
, u_char *out, size_t *outlen)
{
#ifdef SMARTCARD
CK_RV rv;
CK_OBJECT_HANDLE object;
CK_ULONG len = (CK_ULONG)(*outlen);
CK_BBOOL decrypt_flag;
CK_ATTRIBUTE attr[] = {
{ CKA_DECRYPT, &decrypt_flag, sizeof(decrypt_flag) }
};
CK_MECHANISM mech = { CKM_RSA_PKCS, NULL_PTR, 0 };
if (!scx_establish_context(sc) || !scx_login(sc))
{
scx_release_context(sc);
return FALSE;
}
if (!scx_pkcs11_find_object(sc->session, &object, CKO_PRIVATE_KEY, sc->id))
{
plog("unable to find private key with id '%s'", sc->id);
return FALSE;
}
rv = pkcs11_functions->C_GetAttributeValue(sc->session, object, attr, 1);
if (rv != CKR_OK)
{
plog("couldn't read the private key attributes: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
if (!decrypt_flag)
{
plog("private key cannot be used for decryption");
scx_release_context(sc);
return FALSE;
}
DBG(DBG_CONTROL,
DBG_log("doing RSA decryption on smartcard")
)
rv = pkcs11_functions->C_DecryptInit(sc->session, &mech, object);
if (rv != CKR_OK)
{
plog("error in C_DecryptInit: %s"
, enum_show(&pkcs11_return_names, rv));
scx_release_context(sc);
return FALSE;
}
rv = pkcs11_functions->C_Decrypt(sc->session, (u_char*)in, inlen
, out, &len);
if (rv != CKR_OK)
{
plog("error in C_Decrypt: %s"
, enum_show(&pkcs11_return_names, rv));
scx_release_context(sc);
return FALSE;
}
if (!pkcs11_keep_state)
scx_release_context(sc);
*outlen = (size_t)len;
return TRUE;
#else
return FALSE;
#endif
}
/* receive an encrypted data block via whack,
* decrypt it using a private RSA key and
* return the decrypted data block via whack
*/
bool
scx_op_via_whack(const char* msg, int inbase, int outbase, sc_op_t op
, const char* keyid, int whackfd)
{
char inbuf[RSA_MAX_OCTETS];
char outbuf[2*RSA_MAX_OCTETS + 1];
size_t outlen = sizeof(inbuf);
size_t inlen;
smartcard_t *sc,*sc_new;
const char *number_slot_id = "";
err_t ugh = ttodata(msg, 0, inbase, inbuf, sizeof(inbuf), &inlen);
/* no prefix - use default base */
if (ugh != NULL && inbase == 0)
ugh = ttodata(msg, 0, DEFAULT_BASE, inbuf, sizeof(inbuf), &inlen);
if (ugh != NULL)
{
plog("format error in smartcard input data: %s", ugh);
return FALSE;
}
if (keyid != NULL)
{
number_slot_id = (strneq(keyid, SCX_TOKEN, strlen(SCX_TOKEN)))
? keyid + strlen(SCX_TOKEN) : keyid;
}
sc_new = scx_parse_number_slot_id(number_slot_id);
sc = scx_add(sc_new);
if (sc == sc_new)
scx_share(sc);
DBG((op == SC_OP_ENCRYPT)? DBG_PRIVATE:DBG_RAW,
DBG_dump("smartcard input data:\n", inbuf, inlen)
)
if (op == SC_OP_DECRYPT)
{
if (!sc->valid && whackfd != NULL_FD)
scx_get_pin(sc, whackfd);
if (!sc->valid)
{
loglog(RC_NOVALIDPIN, "cannot decrypt without valid PIN");
return FALSE;
}
}
DBG(DBG_CONTROL | DBG_CRYPT,
DBG_log("using RSA key from smartcard (slot: %d, id: %s)"
, (int)sc->slot, sc->id)
)
switch (op)
{
case SC_OP_ENCRYPT:
if (!scx_encrypt(sc, inbuf, inlen, inbuf, &outlen))
return FALSE;
break;
case SC_OP_DECRYPT:
if (!scx_decrypt(sc, inbuf, inlen, inbuf, &outlen))
return FALSE;
break;
default:
break;
}
DBG((op == SC_OP_DECRYPT)? DBG_PRIVATE:DBG_RAW,
DBG_dump("smartcard output data:\n", inbuf, outlen)
)
if (outbase == 0) /* use default base */
outbase = DEFAULT_BASE;
if (outbase == 256) /* ascii plain text */
whack_log(RC_COMMENT, "%.*s", (int)outlen, inbuf);
else
{
outlen = datatot(inbuf, outlen, outbase, outbuf, sizeof(outbuf));
if (outlen == 0)
{
plog("error in output format conversion");
return FALSE;
}
whack_log(RC_COMMENT, "%s", outbuf);
}
return TRUE;
}
/*
* get length of RSA key in bytes
*/
size_t
scx_get_keylength(smartcard_t *sc)
{
#ifdef SMARTCARD
CK_RV rv;
CK_OBJECT_HANDLE object;
CK_ATTRIBUTE attr[] = {{ CKA_MODULUS, NULL_PTR, 0}};
if (!sc->logged_in)
return FALSE;
if (!scx_pkcs11_find_object(sc->session, &object, CKO_PRIVATE_KEY, sc->id))
{
plog("unable to find private key with id '%s'", sc->id);
return FALSE;
}
/* get the length of the private key */
rv = pkcs11_functions->C_GetAttributeValue(sc->session, object
, (CK_ATTRIBUTE_PTR)&attr, 1);
if (rv != CKR_OK)
{
plog("failed to get key length: %s"
, enum_show(&pkcs11_return_names, rv));
return FALSE;
}
return attr[0].ulValueLen; /*Return key length in bytes */
#else
return 0;
#endif
}
/*
* prompt for pin and verify it
*/
bool
scx_get_pin(smartcard_t *sc, int whackfd)
{
#ifdef SMARTCARD
char pin[BUF_LEN];
int i, n;
whack_log(RC_ENTERSECRET, "need PIN for #%d (%s, id: %s, label: '%s')"
, sc->number, scx_print_slot(sc, ""), sc->id, sc->label);
for (i = 0; i < SCX_MAX_PIN_TRIALS; i++)
{
if (i > 0)
whack_log(RC_ENTERSECRET, "invalid PIN, please try again");
n = read(whackfd, pin, BUF_LEN);
if (n == -1)
{
whack_log(RC_LOG_SERIOUS, "read(whackfd) failed");
return FALSE;
}
if (strlen(pin) == 0)
{
whack_log(RC_LOG_SERIOUS, "no PIN entered, aborted");
return FALSE;
}
sc->pin.ptr = pin;
sc->pin.len = strlen(pin);
/* verify the pin */
if (scx_verify_pin(sc))
{
sc->pin = chunk_create(pin, strlen(pin));
sc->pin = chunk_clone(sc->pin);
break;
}
/* wrong pin - we try another round */
sc->pin = chunk_empty;
}
if (sc->valid)
whack_log(RC_SUCCESS, "valid PIN");
else
whack_log(RC_LOG_SERIOUS, "invalid PIN, too many trials");
#else
sc->valid = FALSE;
whack_log(RC_LOG_SERIOUS, "SMARTCARD support is deactivated in pluto/Makefile!");
#endif
return sc->valid;
}
/*
* free the pin code
*/
void
scx_free_pin(chunk_t *pin)
{
if (pin->ptr != NULL)
{
/* clear pin field in memory */
memset(pin->ptr, '\0', pin->len);
free(pin->ptr);
*pin = chunk_empty;
}
}
/*
* frees a smartcard record
*/
void
scx_free(smartcard_t *sc)
{
if (sc != NULL)
{
scx_release_context(sc);
free(sc->id);
free(sc->label);
scx_free_pin(&sc->pin);
free(sc);
}
}
/* release of a smartcard record decreases the count by one
" the record is freed when the counter reaches zero
*/
void
scx_release(smartcard_t *sc)
{
if (sc != NULL && --sc->count == 0)
{
smartcard_t **pp = &smartcards;
while (*pp != sc)
pp = &(*pp)->next;
*pp = sc->next;
release_cert(sc->last_cert);
scx_free(sc);
}
}
/*
* compare two smartcard records by comparing their slots and ids
*/
static bool
scx_same(smartcard_t *a, smartcard_t *b)
{
if (a->number && b->number)
{
/* same number */
return a->number == b->number;
}
else
{
/* same id and/or same slot */
return (!a->id || (b->id && streq(a->id, b->id)))
&& (a->any_slot || b->any_slot || a->slot == b->slot);
}
}
/* for each link pointing to the smartcard record
" increase the count by one
*/
void
scx_share(smartcard_t *sc)
{
if (sc != NULL)
sc->count++;
}
/*
* adds a smartcard record to the chained list
*/
smartcard_t*
scx_add(smartcard_t *smartcard)
{
smartcard_t *sc = smartcards;
smartcard_t **psc = &smartcards;
while (sc != NULL)
{
if (scx_same(smartcard, sc)) /* already in chain, free smartcard record */
{
scx_free(smartcard);
return sc;
}
psc = &sc->next;
sc = sc->next;
}
/* insert new smartcard record at the end of the chain */
*psc = smartcard;
smartcard->number = ++sc_number;
smartcard->count = 1;
DBG(DBG_CONTROL | DBG_PARSING,
DBG_log(" smartcard #%d added", sc_number)
)
return smartcard;
}
/*
* get the smartcard that belongs to an X.509 certificate
*/
smartcard_t*
scx_get(x509cert_t *cert)
{
smartcard_t *sc = smartcards;
while (sc != NULL)
{
if (sc->last_cert.u.x509 == cert)
return sc;
sc = sc->next;
}
return NULL;
}
/*
* prints either the slot number or 'any slot'
*/
char *
scx_print_slot(smartcard_t *sc, const char *whitespace)
{
char *buf = temporary_cyclic_buffer();
if (sc->any_slot)
snprintf(buf, BUF_LEN, "any slot");
else
snprintf(buf, BUF_LEN, "slot: %s%lu", whitespace, sc->slot);
return buf;
}
/*
* list all smartcard info records in a chained list
*/
void
scx_list(bool utc)
{
smartcard_t *sc = smartcards;
if (sc != NULL)
{
whack_log(RC_COMMENT, " ");
whack_log(RC_COMMENT, "List of Smartcard Objects:");
whack_log(RC_COMMENT, " ");
}
while (sc != NULL)
{
whack_log(RC_COMMENT, "%T, #%d, count: %d"
, &sc->last_load, utc
, sc->number
, sc->count);
whack_log(RC_COMMENT, " %s, session %s, logged %s, has %s"
, scx_print_slot(sc, " ")
, sc->session_opened? "opened" : "closed"
, sc->logged_in? "in" : "out"
, sc->pinpad? "pin pad"
: ((sc->pin.ptr == NULL)? "no pin"
: sc->valid? "valid pin" : "invalid pin"));
if (sc->id != NULL)
whack_log(RC_COMMENT, " id: %s", sc->id);
if (sc->label != NULL)
whack_log(RC_COMMENT, " label: '%s'", sc->label);
if (sc->last_cert.type == CERT_X509_SIGNATURE)
{
char buf[BUF_LEN];
dntoa(buf, BUF_LEN, sc->last_cert.u.x509->subject);
whack_log(RC_COMMENT, " subject: '%s'", buf);
}
sc = sc->next;
}
}
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