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qemu/libcacard/vcard_emul_nss.c
Michael Tokarev a22f8f3894 libcacard: replace pstrcpy() with memcpy() 
Commit 2e679780ae replaced strncpy() with pstrcpy()
in one place in libcacard.  This is a qemu-specific function,
while libcacard is a stand-alone library (or tries to be).
But since we know the exact length of the string to copy,
and know that it definitely will fit in the destination
buffer, use memcpy() instead, and null-terminate the string
after that.

An alternative is to use g_strlcpy() or strncpy(), but memcpy()
is more than adequate in this place.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Cc: qemu-trivial@nongnu.org
Cc: Alon Levy <alevy@redhat.com>
2014-05-07 21:00:43 +04:00

1274 lines
38 KiB
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/*
* This is the actual card emulator.
*
* These functions can be implemented in different ways on different platforms
* using the underlying system primitives. For Linux it uses NSS, though direct
* to PKCS #11, openssl+pkcs11, or even gnu crypto libraries+pkcs #11 could be
* used. On Windows CAPI could be used.
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*/
/*
* NSS headers
*/
/* avoid including prototypes.h that redefines uint32 */
#define NO_NSPR_10_SUPPORT
#include <nss.h>
#include <pk11pub.h>
#include <cert.h>
#include <key.h>
#include <secmod.h>
#include <prthread.h>
#include <secerr.h>
#include "qemu-common.h"
#include "vcard.h"
#include "card_7816t.h"
#include "vcard_emul.h"
#include "vreader.h"
#include "vevent.h"
#include "libcacard/vcardt_internal.h"
typedef enum {
VCardEmulUnknown = -1,
VCardEmulFalse = 0,
VCardEmulTrue = 1
} VCardEmulTriState;
struct VCardKeyStruct {
CERTCertificate *cert;
PK11SlotInfo *slot;
SECKEYPrivateKey *key;
VCardEmulTriState failedX509;
};
typedef struct VirtualReaderOptionsStruct VirtualReaderOptions;
struct VReaderEmulStruct {
PK11SlotInfo *slot;
VCardEmulType default_type;
char *type_params;
PRBool present;
int series;
VCard *saved_vcard;
};
/*
* NSS Specific options
*/
struct VirtualReaderOptionsStruct {
char *name;
char *vname;
VCardEmulType card_type;
char *type_params;
char **cert_name;
int cert_count;
};
struct VCardEmulOptionsStruct {
void *nss_db;
VirtualReaderOptions *vreader;
int vreader_count;
VCardEmulType hw_card_type;
const char *hw_type_params;
PRBool use_hw;
};
static int nss_emul_init;
/* if we have more that just the slot, define
* VCardEmulStruct here */
/*
* allocate the set of arrays for certs, cert_len, key
*/
static void
vcard_emul_alloc_arrays(unsigned char ***certsp, int **cert_lenp,
VCardKey ***keysp, int cert_count)
{
*certsp = (unsigned char **)g_malloc(sizeof(unsigned char *)*cert_count);
*cert_lenp = (int *)g_malloc(sizeof(int)*cert_count);
*keysp = (VCardKey **)g_malloc(sizeof(VCardKey *)*cert_count);
}
/*
* Emulator specific card information
*/
typedef struct CardEmulCardStruct CardEmulPrivate;
static VCardEmul *
vcard_emul_new_card(PK11SlotInfo *slot)
{
PK11_ReferenceSlot(slot);
/* currently we don't need anything other than the slot */
return (VCardEmul *)slot;
}
static void
vcard_emul_delete_card(VCardEmul *vcard_emul)
{
PK11SlotInfo *slot = (PK11SlotInfo *)vcard_emul;
if (slot == NULL) {
return;
}
PK11_FreeSlot(slot);
}
static PK11SlotInfo *
vcard_emul_card_get_slot(VCard *card)
{
/* note, the card is holding the reference, no need to get another one */
return (PK11SlotInfo *)vcard_get_private(card);
}
/*
* key functions
*/
/* private constructure */
static VCardKey *
vcard_emul_make_key(PK11SlotInfo *slot, CERTCertificate *cert)
{
VCardKey *key;
key = (VCardKey *)g_malloc(sizeof(VCardKey));
key->slot = PK11_ReferenceSlot(slot);
key->cert = CERT_DupCertificate(cert);
/* NOTE: if we aren't logged into the token, this could return NULL */
/* NOTE: the cert is a temp cert, not necessarily the cert in the token,
* use the DER version of this function */
key->key = PK11_FindKeyByDERCert(slot, cert, NULL);
key->failedX509 = VCardEmulUnknown;
return key;
}
/* destructor */
void
vcard_emul_delete_key(VCardKey *key)
{
if (!nss_emul_init || (key == NULL)) {
return;
}
if (key->key) {
SECKEY_DestroyPrivateKey(key->key);
key->key = NULL;
}
if (key->cert) {
CERT_DestroyCertificate(key->cert);
}
if (key->slot) {
PK11_FreeSlot(key->slot);
}
}
/*
* grab the nss key from a VCardKey. If it doesn't exist, try to look it up
*/
static SECKEYPrivateKey *
vcard_emul_get_nss_key(VCardKey *key)
{
if (key->key) {
return key->key;
}
/* NOTE: if we aren't logged into the token, this could return NULL */
key->key = PK11_FindPrivateKeyFromCert(key->slot, key->cert, NULL);
return key->key;
}
/*
* Map NSS errors to 7816 errors
*/
static vcard_7816_status_t
vcard_emul_map_error(int error)
{
switch (error) {
case SEC_ERROR_TOKEN_NOT_LOGGED_IN:
return VCARD7816_STATUS_ERROR_CONDITION_NOT_SATISFIED;
case SEC_ERROR_BAD_DATA:
case SEC_ERROR_OUTPUT_LEN:
case SEC_ERROR_INPUT_LEN:
case SEC_ERROR_INVALID_ARGS:
case SEC_ERROR_INVALID_ALGORITHM:
case SEC_ERROR_NO_KEY:
case SEC_ERROR_INVALID_KEY:
case SEC_ERROR_DECRYPTION_DISALLOWED:
return VCARD7816_STATUS_ERROR_DATA_INVALID;
case SEC_ERROR_NO_MEMORY:
return VCARD7816_STATUS_EXC_ERROR_MEMORY_FAILURE;
}
return VCARD7816_STATUS_EXC_ERROR_CHANGE;
}
/* RSA sign/decrypt with the key, signature happens 'in place' */
vcard_7816_status_t
vcard_emul_rsa_op(VCard *card, VCardKey *key,
unsigned char *buffer, int buffer_size)
{
SECKEYPrivateKey *priv_key;
unsigned signature_len;
PK11SlotInfo *slot;
SECStatus rv;
unsigned char buf[2048];
unsigned char *bp = NULL;
int pad_len;
vcard_7816_status_t ret = VCARD7816_STATUS_SUCCESS;
if ((!nss_emul_init) || (key == NULL)) {
/* couldn't get the key, indicate that we aren't logged in */
return VCARD7816_STATUS_ERROR_CONDITION_NOT_SATISFIED;
}
priv_key = vcard_emul_get_nss_key(key);
if (priv_key == NULL) {
/* couldn't get the key, indicate that we aren't logged in */
return VCARD7816_STATUS_ERROR_CONDITION_NOT_SATISFIED;
}
slot = vcard_emul_card_get_slot(card);
/*
* this is only true of the rsa signature
*/
signature_len = PK11_SignatureLen(priv_key);
if (buffer_size != signature_len) {
return VCARD7816_STATUS_ERROR_DATA_INVALID;
}
/* be able to handle larger keys if necessariy */
bp = &buf[0];
if (sizeof(buf) < signature_len) {
bp = g_malloc(signature_len);
}
/*
* do the raw operations. Some tokens claim to do CKM_RSA_X_509, but then
* choke when they try to do the actual operations. Try to detect
* those cases and treat them as if the token didn't claim support for
* X_509.
*/
if (key->failedX509 != VCardEmulTrue
&& PK11_DoesMechanism(slot, CKM_RSA_X_509)) {
rv = PK11_PrivDecryptRaw(priv_key, bp, &signature_len, signature_len,
buffer, buffer_size);
if (rv == SECSuccess) {
assert(buffer_size == signature_len);
memcpy(buffer, bp, signature_len);
key->failedX509 = VCardEmulFalse;
goto cleanup;
}
/*
* we've had a successful X509 operation, this failure must be
* somethine else
*/
if (key->failedX509 == VCardEmulFalse) {
ret = vcard_emul_map_error(PORT_GetError());
goto cleanup;
}
/*
* key->failedX509 must be Unknown at this point, try the
* non-x_509 case
*/
}
/* token does not support CKM_RSA_X509, emulate that with CKM_RSA_PKCS */
/* is this a PKCS #1 formatted signature? */
if ((buffer[0] == 0) && (buffer[1] == 1)) {
int i;
for (i = 2; i < buffer_size; i++) {
/* rsa signature pad */
if (buffer[i] != 0xff) {
break;
}
}
if ((i < buffer_size) && (buffer[i] == 0)) {
/* yes, we have a properly formated PKCS #1 signature */
/*
* NOTE: even if we accidentally got an encrypt buffer, which
* through shear luck started with 00, 01, ff, 00, it won't matter
* because the resulting Sign operation will effectively decrypt
* the real buffer.
*/
SECItem signature;
SECItem hash;
i++;
hash.data = &buffer[i];
hash.len = buffer_size - i;
signature.data = bp;
signature.len = signature_len;
rv = PK11_Sign(priv_key, &signature, &hash);
if (rv != SECSuccess) {
ret = vcard_emul_map_error(PORT_GetError());
goto cleanup;
}
assert(buffer_size == signature.len);
memcpy(buffer, bp, signature.len);
/*
* we got here because either the X509 attempt failed, or the
* token couldn't do the X509 operation, in either case stay
* with the PKCS version for future operations on this key
*/
key->failedX509 = VCardEmulTrue;
goto cleanup;
}
}
pad_len = buffer_size - signature_len;
assert(pad_len < 4);
/*
* OK now we've decrypted the payload, package it up in PKCS #1 for the
* upper layer.
*/
buffer[0] = 0;
buffer[1] = 2; /* RSA_encrypt */
pad_len -= 3; /* format is 0 || 2 || pad || 0 || data */
/*
* padding for PKCS #1 encrypted data is a string of random bytes. The
* random butes protect against potential decryption attacks against RSA.
* Since PrivDecrypt has already stripped those bytes, we can't reconstruct
* them. This shouldn't matter to the upper level code which should just
* strip this code out anyway, so We'll pad with a constant 3.
*/
memset(&buffer[2], 0x03, pad_len);
pad_len += 2; /* index to the end of the pad */
buffer[pad_len] = 0;
pad_len++; /* index to the start of the data */
memcpy(&buffer[pad_len], bp, signature_len);
/*
* we got here because either the X509 attempt failed, or the
* token couldn't do the X509 operation, in either case stay
* with the PKCS version for future operations on this key
*/
key->failedX509 = VCardEmulTrue;
cleanup:
if (bp != buf) {
g_free(bp);
}
return ret;
}
/*
* Login functions
*/
/* return the number of login attempts still possible on the card. if unknown,
* return -1 */
int
vcard_emul_get_login_count(VCard *card)
{
return -1;
}
/* login into the card, return the 7816 status word (sw2 || sw1) */
vcard_7816_status_t
vcard_emul_login(VCard *card, unsigned char *pin, int pin_len)
{
PK11SlotInfo *slot;
unsigned char *pin_string = NULL;
int i;
SECStatus rv;
if (!nss_emul_init) {
return VCARD7816_STATUS_ERROR_CONDITION_NOT_SATISFIED;
}
slot = vcard_emul_card_get_slot(card);
/* We depend on the PKCS #11 module internal login state here because we
* create a separate process to handle each guest instance. If we needed
* to handle multiple guests from one process, then we would need to keep
* a lot of extra state in our card structure
* */
pin_string = g_malloc(pin_len+1);
memcpy(pin_string, pin, pin_len);
pin_string[pin_len] = 0;
/* handle CAC expanded pins correctly */
for (i = pin_len-1; i >= 0 && (pin_string[i] == 0xff); i--) {
pin_string[i] = 0;
}
rv = PK11_Authenticate(slot, PR_FALSE, pin_string);
memset(pin_string, 0, pin_len); /* don't let the pin hang around in memory
to be snooped */
g_free(pin_string);
if (rv == SECSuccess) {
return VCARD7816_STATUS_SUCCESS;
}
/* map the error from port get error */
return VCARD7816_STATUS_ERROR_CONDITION_NOT_SATISFIED;
}
void
vcard_emul_reset(VCard *card, VCardPower power)
{
PK11SlotInfo *slot;
if (!nss_emul_init) {
return;
}
/*
* if we reset the card (either power on or power off), we lose our login
* state
*/
/* TODO: we may also need to send insertion/removal events? */
slot = vcard_emul_card_get_slot(card);
PK11_Logout(slot); /* NOTE: ignoring SECStatus return value */
}
static VReader *
vcard_emul_find_vreader_from_slot(PK11SlotInfo *slot)
{
VReaderList *reader_list = vreader_get_reader_list();
VReaderListEntry *current_entry = NULL;
if (reader_list == NULL) {
return NULL;
}
for (current_entry = vreader_list_get_first(reader_list); current_entry;
current_entry = vreader_list_get_next(current_entry)) {
VReader *reader = vreader_list_get_reader(current_entry);
VReaderEmul *reader_emul = vreader_get_private(reader);
if (reader_emul->slot == slot) {
return reader;
}
vreader_free(reader);
}
return NULL;
}
/*
* create a new reader emul
*/
static VReaderEmul *
vreader_emul_new(PK11SlotInfo *slot, VCardEmulType type, const char *params)
{
VReaderEmul *new_reader_emul;
new_reader_emul = (VReaderEmul *)g_malloc(sizeof(VReaderEmul));
new_reader_emul->slot = PK11_ReferenceSlot(slot);
new_reader_emul->default_type = type;
new_reader_emul->type_params = g_strdup(params);
new_reader_emul->present = PR_FALSE;
new_reader_emul->series = 0;
new_reader_emul->saved_vcard = NULL;
return new_reader_emul;
}
static void
vreader_emul_delete(VReaderEmul *vreader_emul)
{
if (vreader_emul == NULL) {
return;
}
if (vreader_emul->slot) {
PK11_FreeSlot(vreader_emul->slot);
}
if (vreader_emul->type_params) {
g_free(vreader_emul->type_params);
}
g_free(vreader_emul);
}
/*
* TODO: move this to emulater non-specific file
*/
static VCardEmulType
vcard_emul_get_type(VReader *vreader)
{
VReaderEmul *vreader_emul;
vreader_emul = vreader_get_private(vreader);
if (vreader_emul && vreader_emul->default_type != VCARD_EMUL_NONE) {
return vreader_emul->default_type;
}
return vcard_emul_type_select(vreader);
}
/*
* TODO: move this to emulater non-specific file
*/
static const char *
vcard_emul_get_type_params(VReader *vreader)
{
VReaderEmul *vreader_emul;
vreader_emul = vreader_get_private(vreader);
if (vreader_emul && vreader_emul->type_params) {
return vreader_emul->type_params;
}
return "";
}
/* pull the slot out of the reader private data */
static PK11SlotInfo *
vcard_emul_reader_get_slot(VReader *vreader)
{
VReaderEmul *vreader_emul = vreader_get_private(vreader);
if (vreader_emul == NULL) {
return NULL;
}
return vreader_emul->slot;
}
/*
* Card ATR's map to physical cards. vcard_alloc_atr will set appropriate
* historical bytes for any software emulated card. The remaining bytes can be
* used to indicate the actual emulator
*/
static unsigned char *nss_atr;
static int nss_atr_len;
void
vcard_emul_get_atr(VCard *card, unsigned char *atr, int *atr_len)
{
int len;
assert(atr != NULL);
if (nss_atr == NULL) {
nss_atr = vcard_alloc_atr("NSS", &nss_atr_len);
}
len = MIN(nss_atr_len, *atr_len);
memcpy(atr, nss_atr, len);
*atr_len = len;
}
/*
* create a new card from certs and keys
*/
static VCard *
vcard_emul_make_card(VReader *reader,
unsigned char * const *certs, int *cert_len,
VCardKey *keys[], int cert_count)
{
VCardEmul *vcard_emul;
VCard *vcard;
PK11SlotInfo *slot;
VCardEmulType type;
const char *params;
type = vcard_emul_get_type(reader);
/* ignore the inserted card */
if (type == VCARD_EMUL_NONE) {
return NULL;
}
slot = vcard_emul_reader_get_slot(reader);
if (slot == NULL) {
return NULL;
}
params = vcard_emul_get_type_params(reader);
/* params these can be NULL */
vcard_emul = vcard_emul_new_card(slot);
if (vcard_emul == NULL) {
return NULL;
}
vcard = vcard_new(vcard_emul, vcard_emul_delete_card);
if (vcard == NULL) {
vcard_emul_delete_card(vcard_emul);
return NULL;
}
vcard_init(reader, vcard, type, params, certs, cert_len, keys, cert_count);
return vcard;
}
/*
* 'clone' a physical card as a virtual card
*/
static VCard *
vcard_emul_mirror_card(VReader *vreader)
{
/*
* lookup certs using the C_FindObjects. The Stan Cert handle won't give
* us the real certs until we log in.
*/
PK11GenericObject *firstObj, *thisObj;
int cert_count;
unsigned char **certs;
int *cert_len;
VCardKey **keys;
PK11SlotInfo *slot;
VCard *card;
slot = vcard_emul_reader_get_slot(vreader);
if (slot == NULL) {
return NULL;
}
firstObj = PK11_FindGenericObjects(slot, CKO_CERTIFICATE);
if (firstObj == NULL) {
return NULL;
}
/* count the certs */
cert_count = 0;
for (thisObj = firstObj; thisObj;
thisObj = PK11_GetNextGenericObject(thisObj)) {
cert_count++;
}
if (cert_count == 0) {
PK11_DestroyGenericObjects(firstObj);
return NULL;
}
/* allocate the arrays */
vcard_emul_alloc_arrays(&certs, &cert_len, &keys, cert_count);
/* fill in the arrays */
cert_count = 0;
for (thisObj = firstObj; thisObj;
thisObj = PK11_GetNextGenericObject(thisObj)) {
SECItem derCert;
CERTCertificate *cert;
SECStatus rv;
rv = PK11_ReadRawAttribute(PK11_TypeGeneric, thisObj,
CKA_VALUE, &derCert);
if (rv != SECSuccess) {
continue;
}
/* create floating temp cert. This gives us a cert structure even if
* the token isn't logged in */
cert = CERT_NewTempCertificate(CERT_GetDefaultCertDB(), &derCert,
NULL, PR_FALSE, PR_TRUE);
SECITEM_FreeItem(&derCert, PR_FALSE);
if (cert == NULL) {
continue;
}
certs[cert_count] = cert->derCert.data;
cert_len[cert_count] = cert->derCert.len;
keys[cert_count] = vcard_emul_make_key(slot, cert);
cert_count++;
CERT_DestroyCertificate(cert); /* key obj still has a reference */
}
/* now create the card */
card = vcard_emul_make_card(vreader, certs, cert_len, keys, cert_count);
g_free(certs);
g_free(cert_len);
g_free(keys);
return card;
}
static VCardEmulType default_card_type = VCARD_EMUL_NONE;
static const char *default_type_params = "";
/*
* This thread looks for card and reader insertions and puts events on the
* event queue
*/
static void
vcard_emul_event_thread(void *arg)
{
PK11SlotInfo *slot;
VReader *vreader;
VReaderEmul *vreader_emul;
VCard *vcard;
SECMODModule *module = (SECMODModule *)arg;
do {
/*
* XXX - the latency value doesn't matter one bit. you only get no
* blocking (flags |= CKF_DONT_BLOCK) or PKCS11_WAIT_LATENCY (==500),
* hard coded in coolkey. And it isn't coolkey's fault - the timeout
* value we pass get's dropped on the floor before C_WaitForSlotEvent
* is called.
*/
slot = SECMOD_WaitForAnyTokenEvent(module, 0, 500);
if (slot == NULL) {
/* this could be just a no event indication */
if (PORT_GetError() == SEC_ERROR_NO_EVENT) {
continue;
}
break;
}
vreader = vcard_emul_find_vreader_from_slot(slot);
if (vreader == NULL) {
/* new vreader */
vreader_emul = vreader_emul_new(slot, default_card_type,
default_type_params);
vreader = vreader_new(PK11_GetSlotName(slot), vreader_emul,
vreader_emul_delete);
PK11_FreeSlot(slot);
slot = NULL;
vreader_add_reader(vreader);
vreader_free(vreader);
continue;
}
/* card remove/insert */
vreader_emul = vreader_get_private(vreader);
if (PK11_IsPresent(slot)) {
int series = PK11_GetSlotSeries(slot);
if (series != vreader_emul->series) {
if (vreader_emul->present) {
vreader_insert_card(vreader, NULL);
}
vcard = vcard_emul_mirror_card(vreader);
vreader_insert_card(vreader, vcard);
vcard_free(vcard);
}
vreader_emul->series = series;
vreader_emul->present = 1;
vreader_free(vreader);
PK11_FreeSlot(slot);
continue;
}
if (vreader_emul->present) {
vreader_insert_card(vreader, NULL);
}
vreader_emul->series = 0;
vreader_emul->present = 0;
PK11_FreeSlot(slot);
vreader_free(vreader);
} while (1);
}
/* if the card is inserted when we start up, make sure our state is correct */
static void
vcard_emul_init_series(VReader *vreader, VCard *vcard)
{
VReaderEmul *vreader_emul = vreader_get_private(vreader);
PK11SlotInfo *slot = vreader_emul->slot;
vreader_emul->present = PK11_IsPresent(slot);
vreader_emul->series = PK11_GetSlotSeries(slot);
if (vreader_emul->present == 0) {
vreader_insert_card(vreader, NULL);
}
}
/*
* each module has a separate wait call, create a thread for each module that
* we are using.
*/
static void
vcard_emul_new_event_thread(SECMODModule *module)
{
PR_CreateThread(PR_SYSTEM_THREAD, vcard_emul_event_thread,
module, PR_PRIORITY_HIGH, PR_GLOBAL_THREAD,
PR_UNJOINABLE_THREAD, 0);
}
static const VCardEmulOptions default_options = {
.nss_db = NULL,
.vreader = NULL,
.vreader_count = 0,
.hw_card_type = VCARD_EMUL_CAC,
.hw_type_params = "",
.use_hw = PR_TRUE
};
/*
* NSS needs the app to supply a password prompt. In our case the only time
* the password is supplied is as part of the Login APDU. The actual password
* is passed in the pw_arg in that case. In all other cases pw_arg should be
* NULL.
*/
static char *
vcard_emul_get_password(PK11SlotInfo *slot, PRBool retries, void *pw_arg)
{
/* if it didn't work the first time, don't keep trying */
if (retries) {
return NULL;
}
/* we are looking up a password when we don't have one in hand */
if (pw_arg == NULL) {
return NULL;
}
/* TODO: we really should verify that were are using the right slot */
return PORT_Strdup(pw_arg);
}
/* Force a card removal even if the card is not physically removed */
VCardEmulError
vcard_emul_force_card_remove(VReader *vreader)
{
if (!nss_emul_init || (vreader_card_is_present(vreader) != VREADER_OK)) {
return VCARD_EMUL_FAIL; /* card is already removed */
}
/* OK, remove it */
vreader_insert_card(vreader, NULL);
return VCARD_EMUL_OK;
}
/* Re-insert of a card that has been removed by force removal */
VCardEmulError
vcard_emul_force_card_insert(VReader *vreader)
{
VReaderEmul *vreader_emul;
VCard *vcard;
if (!nss_emul_init || (vreader_card_is_present(vreader) == VREADER_OK)) {
return VCARD_EMUL_FAIL; /* card is already removed */
}
vreader_emul = vreader_get_private(vreader);
/* if it's a softcard, get the saved vcard from the reader emul structure */
if (vreader_emul->saved_vcard) {
vcard = vcard_reference(vreader_emul->saved_vcard);
} else {
/* it must be a physical card, rebuild it */
if (!PK11_IsPresent(vreader_emul->slot)) {
/* physical card has been removed, not way to reinsert it */
return VCARD_EMUL_FAIL;
}
vcard = vcard_emul_mirror_card(vreader);
}
vreader_insert_card(vreader, vcard);
vcard_free(vcard);
return VCARD_EMUL_OK;
}
static PRBool
module_has_removable_hw_slots(SECMODModule *mod)
{
int i;
PRBool ret = PR_FALSE;
SECMODListLock *moduleLock = SECMOD_GetDefaultModuleListLock();
if (!moduleLock) {
PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
return ret;
}
SECMOD_GetReadLock(moduleLock);
for (i = 0; i < mod->slotCount; i++) {
PK11SlotInfo *slot = mod->slots[i];
if (PK11_IsRemovable(slot) && PK11_IsHW(slot)) {
ret = PR_TRUE;
break;
}
}
SECMOD_ReleaseReadLock(moduleLock);
return ret;
}
/* Previously we returned FAIL if no readers found. This makes
* no sense when using hardware, since there may be no readers connected
* at the time vcard_emul_init is called, but they will be properly
* recognized later. So Instead return FAIL only if no_hw==1 and no
* vcards can be created (indicates error with certificates provided
* or db), or if any other higher level error (NSS error, missing coolkey). */
static int vcard_emul_init_called;
VCardEmulError
vcard_emul_init(const VCardEmulOptions *options)
{
SECStatus rv;
PRBool has_readers = PR_FALSE;
VReader *vreader;
VReaderEmul *vreader_emul;
SECMODListLock *module_lock;
SECMODModuleList *module_list;
SECMODModuleList *mlp;
int i;
if (vcard_emul_init_called) {
return VCARD_EMUL_INIT_ALREADY_INITED;
}
vcard_emul_init_called = 1;
vreader_init();
vevent_queue_init();
if (options == NULL) {
options = &default_options;
}
/* first initialize NSS */
if (options->nss_db) {
rv = NSS_Init(options->nss_db);
} else {
gchar *path;
#ifndef _WIN32
path = g_strdup("/etc/pki/nssdb");
#else
if (g_get_system_config_dirs() == NULL ||
g_get_system_config_dirs()[0] == NULL) {
return VCARD_EMUL_FAIL;
}
path = g_build_filename(
g_get_system_config_dirs()[0], "pki", "nssdb", NULL);
#endif
rv = NSS_Init(path);
g_free(path);
}
if (rv != SECSuccess) {
return VCARD_EMUL_FAIL;
}
/* Set password callback function */
PK11_SetPasswordFunc(vcard_emul_get_password);
/* set up soft cards emulated by software certs rather than physical cards
* */
for (i = 0; i < options->vreader_count; i++) {
int j;
int cert_count;
unsigned char **certs;
int *cert_len;
VCardKey **keys;
PK11SlotInfo *slot;
slot = PK11_FindSlotByName(options->vreader[i].name);
if (slot == NULL) {
continue;
}
vreader_emul = vreader_emul_new(slot, options->vreader[i].card_type,
options->vreader[i].type_params);
vreader = vreader_new(options->vreader[i].vname, vreader_emul,
vreader_emul_delete);
vreader_add_reader(vreader);
vcard_emul_alloc_arrays(&certs, &cert_len, &keys,
options->vreader[i].cert_count);
cert_count = 0;
for (j = 0; j < options->vreader[i].cert_count; j++) {
/* we should have a better way of identifying certs than by
* nickname here */
CERTCertificate *cert = PK11_FindCertFromNickname(
options->vreader[i].cert_name[j],
NULL);
if (cert == NULL) {
continue;
}
certs[cert_count] = cert->derCert.data;
cert_len[cert_count] = cert->derCert.len;
keys[cert_count] = vcard_emul_make_key(slot, cert);
/* this is safe because the key is still holding a cert reference */
CERT_DestroyCertificate(cert);
cert_count++;
}
if (cert_count) {
VCard *vcard = vcard_emul_make_card(vreader, certs, cert_len,
keys, cert_count);
vreader_insert_card(vreader, vcard);
vcard_emul_init_series(vreader, vcard);
/* allow insertion and removal of soft cards */
vreader_emul->saved_vcard = vcard_reference(vcard);
vcard_free(vcard);
vreader_free(vreader);
has_readers = PR_TRUE;
}
g_free(certs);
g_free(cert_len);
g_free(keys);
}
/* if we aren't suppose to use hw, skip looking up hardware tokens */
if (!options->use_hw) {
nss_emul_init = has_readers;
return has_readers ? VCARD_EMUL_OK : VCARD_EMUL_FAIL;
}
/* make sure we have some PKCS #11 module loaded */
module_lock = SECMOD_GetDefaultModuleListLock();
module_list = SECMOD_GetDefaultModuleList();
SECMOD_GetReadLock(module_lock);
for (mlp = module_list; mlp; mlp = mlp->next) {
SECMODModule *module = mlp->module;
if (module_has_removable_hw_slots(module)) {
break;
}
}
SECMOD_ReleaseReadLock(module_lock);
/* now examine all the slots, finding which should be readers */
/* We should control this with options. For now we mirror out any
* removable hardware slot */
default_card_type = options->hw_card_type;
default_type_params = g_strdup(options->hw_type_params);
SECMOD_GetReadLock(module_lock);
for (mlp = module_list; mlp; mlp = mlp->next) {
SECMODModule *module = mlp->module;
/* Ignore the internal module */
if (module == NULL || module == SECMOD_GetInternalModule()) {
continue;
}
for (i = 0; i < module->slotCount; i++) {
PK11SlotInfo *slot = module->slots[i];
/* only map removable HW slots */
if (slot == NULL || !PK11_IsRemovable(slot) || !PK11_IsHW(slot)) {
continue;
}
if (strcmp("E-Gate 0 0", PK11_GetSlotName(slot)) == 0) {
/*
* coolkey <= 1.1.0-20 emulates this reader if it can't find
* any hardware readers. This causes problems, warn user of
* problems.
*/
fprintf(stderr, "known bad coolkey version - see "
"https://bugzilla.redhat.com/show_bug.cgi?id=802435\n");
continue;
}
vreader_emul = vreader_emul_new(slot, options->hw_card_type,
options->hw_type_params);
vreader = vreader_new(PK11_GetSlotName(slot), vreader_emul,
vreader_emul_delete);
vreader_add_reader(vreader);
if (PK11_IsPresent(slot)) {
VCard *vcard;
vcard = vcard_emul_mirror_card(vreader);
vreader_insert_card(vreader, vcard);
vcard_emul_init_series(vreader, vcard);
vcard_free(vcard);
}
}
vcard_emul_new_event_thread(module);
}
SECMOD_ReleaseReadLock(module_lock);
nss_emul_init = PR_TRUE;
return VCARD_EMUL_OK;
}
/* Recreate card insert events for all readers (user should
* deduce implied reader insert. perhaps do a reader insert as well?)
*/
void
vcard_emul_replay_insertion_events(void)
{
VReaderListEntry *current_entry;
VReaderListEntry *next_entry = NULL;
VReaderList *list = vreader_get_reader_list();
for (current_entry = vreader_list_get_first(list); current_entry;
current_entry = next_entry) {
VReader *vreader = vreader_list_get_reader(current_entry);
next_entry = vreader_list_get_next(current_entry);
vreader_queue_card_event(vreader);
}
}
/*
* Silly little functions to help parsing our argument string
*/
static int
count_tokens(const char *str, char token, char token_end)
{
int count = 0;
for (; *str; str++) {
if (*str == token) {
count++;
}
if (*str == token_end) {
break;
}
}
return count;
}
static const char *
strip(const char *str)
{
for (; *str && isspace(*str); str++) {
}
return str;
}
static const char *
find_blank(const char *str)
{
for (; *str && !isspace(*str); str++) {
}
return str;
}
/*
* We really want to use some existing argument parsing library here. That
* would give us a consistent look */
static VCardEmulOptions options;
#define READER_STEP 4
/* Expects "args" to be at the beginning of a token (ie right after the ','
* ending the previous token), and puts the next token start in "token",
* and its length in "token_length". "token" will not be nul-terminated.
* After calling the macro, "args" will be advanced to the beginning of
* the next token.
* This macro may call continue or break.
*/
#define NEXT_TOKEN(token) \
(token) = args; \
args = strpbrk(args, ",)"); \
if (*args == 0) { \
break; \
} \
if (*args == ')') { \
args++; \
continue; \
} \
(token##_length) = args - (token); \
args = strip(args+1);
VCardEmulOptions *
vcard_emul_options(const char *args)
{
int reader_count = 0;
VCardEmulOptions *opts;
/* Allow the future use of allocating the options structure on the fly */
memcpy(&options, &default_options, sizeof(options));
opts = &options;
do {
args = strip(args); /* strip off the leading spaces */
if (*args == ',') {
continue;
}
/* soft=(slot_name,virt_name,emul_type,emul_flags,cert_1, (no eol)
* cert_2,cert_3...) */
if (strncmp(args, "soft=", 5) == 0) {
const char *name;
size_t name_length;
const char *vname;
size_t vname_length;
const char *type_params;
size_t type_params_length;
char type_str[100];
VCardEmulType type;
int count, i;
VirtualReaderOptions *vreaderOpt = NULL;
args = strip(args + 5);
if (*args != '(') {
continue;
}
args = strip(args+1);
NEXT_TOKEN(name)
NEXT_TOKEN(vname)
NEXT_TOKEN(type_params)
type_params_length = MIN(type_params_length, sizeof(type_str)-1);
memcpy(type_str, type_params, type_params_length);
type_str[type_params_length] = '\0';
type = vcard_emul_type_from_string(type_str);
NEXT_TOKEN(type_params)
if (*args == 0) {
break;
}
if (opts->vreader_count >= reader_count) {
reader_count += READER_STEP;
vreaderOpt = realloc(opts->vreader,
reader_count * sizeof(*vreaderOpt));
if (vreaderOpt == NULL) {
return opts; /* we're done */
}
}
opts->vreader = vreaderOpt;
vreaderOpt = &vreaderOpt[opts->vreader_count];
vreaderOpt->name = g_strndup(name, name_length);
vreaderOpt->vname = g_strndup(vname, vname_length);
vreaderOpt->card_type = type;
vreaderOpt->type_params =
g_strndup(type_params, type_params_length);
count = count_tokens(args, ',', ')') + 1;
vreaderOpt->cert_count = count;
vreaderOpt->cert_name = (char **)g_malloc(count*sizeof(char *));
for (i = 0; i < count; i++) {
const char *cert = args;
args = strpbrk(args, ",)");
vreaderOpt->cert_name[i] = g_strndup(cert, args - cert);
args = strip(args+1);
}
if (*args == ')') {
args++;
}
opts->vreader_count++;
/* use_hw= */
} else if (strncmp(args, "use_hw=", 7) == 0) {
args = strip(args+7);
if (*args == '0' || *args == 'N' || *args == 'n' || *args == 'F') {
opts->use_hw = PR_FALSE;
} else {
opts->use_hw = PR_TRUE;
}
args = find_blank(args);
/* hw_type= */
} else if (strncmp(args, "hw_type=", 8) == 0) {
args = strip(args+8);
opts->hw_card_type = vcard_emul_type_from_string(args);
args = find_blank(args);
/* hw_params= */
} else if (strncmp(args, "hw_params=", 10) == 0) {
const char *params;
args = strip(args+10);
params = args;
args = find_blank(args);
opts->hw_type_params = g_strndup(params, args-params);
/* db="/data/base/path" */
} else if (strncmp(args, "db=", 3) == 0) {
const char *db;
args = strip(args+3);
if (*args != '"') {
continue;
}
args++;
db = args;
args = strpbrk(args, "\"\n");
opts->nss_db = g_strndup(db, args-db);
if (*args != 0) {
args++;
}
} else {
args = find_blank(args);
}
} while (*args != 0);
return opts;
}
void
vcard_emul_usage(void)
{
fprintf(stderr,
"emul args: comma separated list of the following arguments\n"
" db={nss_database} (default sql:/etc/pki/nssdb)\n"
" use_hw=[yes|no] (default yes)\n"
" hw_type={card_type_to_emulate} (default CAC)\n"
" hw_param={param_for_card} (default \"\")\n"
" soft=({slot_name},{vreader_name},{card_type_to_emulate},{params_for_card},\n"
" {cert1},{cert2},{cert3} (default none)\n"
"\n"
" {nss_database} The location of the NSS cert & key database\n"
" {card_type_to_emulate} What card interface to present to the guest\n"
" {param_for_card} Card interface specific parameters\n"
" {slot_name} NSS slot that contains the certs\n"
" {vreader_name} Virtual reader name to present to the guest\n"
" {certN} Nickname of the certificate n on the virtual card\n"
"\n"
"These parameters come as a single string separated by blanks or newlines."
"\n"
"Unless use_hw is set to no, all tokens that look like removable hardware\n"
"tokens will be presented to the guest using the emulator specified by\n"
"hw_type, and parameters of hw_param.\n"
"\n"
"If more one or more soft= parameters are specified, these readers will be\n"
"presented to the guest\n");
}
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