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ssh-pkcs11.c
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/* $OpenBSD: ssh-pkcs11.c,v 1.53 2021/06/25 06:30:22 djm Exp $ */
/*
* Copyright (c) 2010 Markus Friedl. All rights reserved.
* Copyright (c) 2014 Pedro Martelletto. All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "includes.h"
#ifdef ENABLE_PKCS11
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <sys/types.h>
#include <stdarg.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <dlfcn.h>
#include "openbsd-compat/sys-queue.h"
#include "openbsd-compat/openssl-compat.h"
#include <openssl/ecdsa.h>
#include <openssl/x509.h>
#include <openssl/err.h>
#define CRYPTOKI_COMPAT
#include "pkcs11.h"
#include "log.h"
#include "misc.h"
#include "sshkey.h"
#include "ssh-pkcs11.h"
#include "digest.h"
#include "xmalloc.h"
struct pkcs11_slotinfo {
CK_TOKEN_INFO token;
CK_SESSION_HANDLE session;
int logged_in;
};
struct pkcs11_provider {
char *name;
void *handle;
CK_FUNCTION_LIST *function_list;
CK_INFO info;
CK_ULONG nslots;
CK_SLOT_ID *slotlist;
struct pkcs11_slotinfo *slotinfo;
int valid;
int refcount;
TAILQ_ENTRY(pkcs11_provider) next;
};
TAILQ_HEAD(, pkcs11_provider) pkcs11_providers;
struct pkcs11_key {
struct pkcs11_provider *provider;
CK_ULONG slotidx;
char *keyid;
int keyid_len;
};
int pkcs11_interactive = 0;
#ifdef HAVE_EC_KEY_METHOD_NEW
static void
ossl_error(const char *msg)
{
unsigned long e;
error_f("%s", msg);
while ((e = ERR_get_error()) != 0)
error_f("libcrypto error: %s", ERR_error_string(e, NULL));
}
#endif /* HAVE_EC_KEY_METHOD_NEW */
int
pkcs11_init(int interactive)
{
pkcs11_interactive = interactive;
TAILQ_INIT(&pkcs11_providers);
return (0);
}
/*
* finalize a provider shared library, it's no longer usable.
* however, there might still be keys referencing this provider,
* so the actual freeing of memory is handled by pkcs11_provider_unref().
* this is called when a provider gets unregistered.
*/
static void
pkcs11_provider_finalize(struct pkcs11_provider *p)
{
CK_RV rv;
CK_ULONG i;
debug("pkcs11_provider_finalize: %p refcount %d valid %d",
p, p->refcount, p->valid);
if (!p->valid)
return;
for (i = 0; i < p->nslots; i++) {
if (p->slotinfo[i].session &&
(rv = p->function_list->C_CloseSession(
p->slotinfo[i].session)) != CKR_OK)
error("C_CloseSession failed: %lu", rv);
}
if ((rv = p->function_list->C_Finalize(NULL)) != CKR_OK)
error("C_Finalize failed: %lu", rv);
p->valid = 0;
p->function_list = NULL;
dlclose(p->handle);
}
/*
* remove a reference to the provider.
* called when a key gets destroyed or when the provider is unregistered.
*/
static void
pkcs11_provider_unref(struct pkcs11_provider *p)
{
debug("pkcs11_provider_unref: %p refcount %d", p, p->refcount);
if (--p->refcount <= 0) {
if (p->valid)
error("pkcs11_provider_unref: %p still valid", p);
free(p->name);
free(p->slotlist);
free(p->slotinfo);
free(p);
}
}
/* unregister all providers, keys might still point to the providers */
void
pkcs11_terminate(void)
{
struct pkcs11_provider *p;
while ((p = TAILQ_FIRST(&pkcs11_providers)) != NULL) {
TAILQ_REMOVE(&pkcs11_providers, p, next);
pkcs11_provider_finalize(p);
pkcs11_provider_unref(p);
}
}
/* lookup provider by name */
static struct pkcs11_provider *
pkcs11_provider_lookup(char *provider_id)
{
struct pkcs11_provider *p;
TAILQ_FOREACH(p, &pkcs11_providers, next) {
debug("check %p %s", p, p->name);
if (!strcmp(provider_id, p->name))
return (p);
}
return (NULL);
}
/* unregister provider by name */
int
pkcs11_del_provider(char *provider_id)
{
struct pkcs11_provider *p;
if ((p = pkcs11_provider_lookup(provider_id)) != NULL) {
TAILQ_REMOVE(&pkcs11_providers, p, next);
pkcs11_provider_finalize(p);
pkcs11_provider_unref(p);
return (0);
}
return (-1);
}
static RSA_METHOD *rsa_method;
static int rsa_idx = 0;
#ifdef HAVE_EC_KEY_METHOD_NEW
static EC_KEY_METHOD *ec_key_method;
static int ec_key_idx = 0;
#endif
/* release a wrapped object */
static void
pkcs11_k11_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad, int idx,
long argl, void *argp)
{
struct pkcs11_key *k11 = ptr;
debug_f("parent %p ptr %p idx %d", parent, ptr, idx);
if (k11 == NULL)
return;
if (k11->provider)
pkcs11_provider_unref(k11->provider);
free(k11->keyid);
free(k11);
}
/* find a single 'obj' for given attributes */
static int
pkcs11_find(struct pkcs11_provider *p, CK_ULONG slotidx, CK_ATTRIBUTE *attr,
CK_ULONG nattr, CK_OBJECT_HANDLE *obj)
{
CK_FUNCTION_LIST *f;
CK_SESSION_HANDLE session;
CK_ULONG nfound = 0;
CK_RV rv;
int ret = -1;
f = p->function_list;
session = p->slotinfo[slotidx].session;
if ((rv = f->C_FindObjectsInit(session, attr, nattr)) != CKR_OK) {
error("C_FindObjectsInit failed (nattr %lu): %lu", nattr, rv);
return (-1);
}
if ((rv = f->C_FindObjects(session, obj, 1, &nfound)) != CKR_OK ||
nfound != 1) {
debug("C_FindObjects failed (nfound %lu nattr %lu): %lu",
nfound, nattr, rv);
} else
ret = 0;
if ((rv = f->C_FindObjectsFinal(session)) != CKR_OK)
error("C_FindObjectsFinal failed: %lu", rv);
return (ret);
}
static int
pkcs11_login_slot(struct pkcs11_provider *provider, struct pkcs11_slotinfo *si,
CK_USER_TYPE type)
{
char *pin = NULL, prompt[1024];
CK_RV rv;
if (provider == NULL || si == NULL || !provider->valid) {
error("no pkcs11 (valid) provider found");
return (-1);
}
if (!pkcs11_interactive) {
error("need pin entry%s",
(si->token.flags & CKF_PROTECTED_AUTHENTICATION_PATH) ?
" on reader keypad" : "");
return (-1);
}
if (si->token.flags & CKF_PROTECTED_AUTHENTICATION_PATH)
verbose("Deferring PIN entry to reader keypad.");
else {
snprintf(prompt, sizeof(prompt), "Enter PIN for '%s': ",
si->token.label);
if ((pin = read_passphrase(prompt, RP_ALLOW_EOF)) == NULL) {
debug_f("no pin specified");
return (-1); /* bail out */
}
}
rv = provider->function_list->C_Login(si->session, type, (u_char *)pin,
(pin != NULL) ? strlen(pin) : 0);
if (pin != NULL)
freezero(pin, strlen(pin));
switch (rv) {
case CKR_OK:
case CKR_USER_ALREADY_LOGGED_IN:
/* success */
break;
case CKR_PIN_LEN_RANGE:
error("PKCS#11 login failed: PIN length out of range");
return -1;
case CKR_PIN_INCORRECT:
error("PKCS#11 login failed: PIN incorrect");
return -1;
case CKR_PIN_LOCKED:
error("PKCS#11 login failed: PIN locked");
return -1;
default:
error("PKCS#11 login failed: error %lu", rv);
return -1;
}
si->logged_in = 1;
return (0);
}
static int
pkcs11_login(struct pkcs11_key *k11, CK_USER_TYPE type)
{
if (k11 == NULL || k11->provider == NULL || !k11->provider->valid) {
error("no pkcs11 (valid) provider found");
return (-1);
}
return pkcs11_login_slot(k11->provider,
&k11->provider->slotinfo[k11->slotidx], type);
}
static int
pkcs11_check_obj_bool_attrib(struct pkcs11_key *k11, CK_OBJECT_HANDLE obj,
CK_ATTRIBUTE_TYPE type, int *val)
{
struct pkcs11_slotinfo *si;
CK_FUNCTION_LIST *f;
CK_BBOOL flag = 0;
CK_ATTRIBUTE attr;
CK_RV rv;
*val = 0;
if (!k11->provider || !k11->provider->valid) {
error("no pkcs11 (valid) provider found");
return (-1);
}
f = k11->provider->function_list;
si = &k11->provider->slotinfo[k11->slotidx];
attr.type = type;
attr.pValue = &flag;
attr.ulValueLen = sizeof(flag);
rv = f->C_GetAttributeValue(si->session, obj, &attr, 1);
if (rv != CKR_OK) {
error("C_GetAttributeValue failed: %lu", rv);
return (-1);
}
*val = flag != 0;
debug_f("provider %p slot %lu object %lu: attrib %lu = %d",
k11->provider, k11->slotidx, obj, type, *val);
return (0);
}
static int
pkcs11_get_key(struct pkcs11_key *k11, CK_MECHANISM_TYPE mech_type)
{
struct pkcs11_slotinfo *si;
CK_FUNCTION_LIST *f;
CK_OBJECT_HANDLE obj;
CK_RV rv;
CK_OBJECT_CLASS private_key_class;
CK_BBOOL true_val;
CK_MECHANISM mech;
CK_ATTRIBUTE key_filter[3];
int always_auth = 0;
int did_login = 0;
if (!k11->provider || !k11->provider->valid) {
error("no pkcs11 (valid) provider found");
return (-1);
}
f = k11->provider->function_list;
si = &k11->provider->slotinfo[k11->slotidx];
if ((si->token.flags & CKF_LOGIN_REQUIRED) && !si->logged_in) {
if (pkcs11_login(k11, CKU_USER) < 0) {
error("login failed");
return (-1);
}
did_login = 1;
}
memset(&key_filter, 0, sizeof(key_filter));
private_key_class = CKO_PRIVATE_KEY;
key_filter[0].type = CKA_CLASS;
key_filter[0].pValue = &private_key_class;
key_filter[0].ulValueLen = sizeof(private_key_class);
key_filter[1].type = CKA_ID;
key_filter[1].pValue = k11->keyid;
key_filter[1].ulValueLen = k11->keyid_len;
true_val = CK_TRUE;
key_filter[2].type = CKA_SIGN;
key_filter[2].pValue = &true_val;
key_filter[2].ulValueLen = sizeof(true_val);
/* try to find object w/CKA_SIGN first, retry w/o */
if (pkcs11_find(k11->provider, k11->slotidx, key_filter, 3, &obj) < 0 &&
pkcs11_find(k11->provider, k11->slotidx, key_filter, 2, &obj) < 0) {
error("cannot find private key");
return (-1);
}
memset(&mech, 0, sizeof(mech));
mech.mechanism = mech_type;
mech.pParameter = NULL_PTR;
mech.ulParameterLen = 0;
if ((rv = f->C_SignInit(si->session, &mech, obj)) != CKR_OK) {
error("C_SignInit failed: %lu", rv);
return (-1);
}
pkcs11_check_obj_bool_attrib(k11, obj, CKA_ALWAYS_AUTHENTICATE,
&always_auth); /* ignore errors here */
if (always_auth && !did_login) {
debug_f("always-auth key");
if (pkcs11_login(k11, CKU_CONTEXT_SPECIFIC) < 0) {
error("login failed for always-auth key");
return (-1);
}
}
return (0);
}
/* openssl callback doing the actual signing operation */
static int
pkcs11_rsa_private_encrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
int padding)
{
struct pkcs11_key *k11;
struct pkcs11_slotinfo *si;
CK_FUNCTION_LIST *f;
CK_ULONG tlen = 0;
CK_RV rv;
int rval = -1;
if ((k11 = RSA_get_ex_data(rsa, rsa_idx)) == NULL) {
error("RSA_get_ex_data failed for rsa %p", rsa);
return (-1);
}
if (pkcs11_get_key(k11, CKM_RSA_PKCS) == -1) {
error("pkcs11_get_key failed");
return (-1);
}
f = k11->provider->function_list;
si = &k11->provider->slotinfo[k11->slotidx];
tlen = RSA_size(rsa);
/* XXX handle CKR_BUFFER_TOO_SMALL */
rv = f->C_Sign(si->session, (CK_BYTE *)from, flen, to, &tlen);
if (rv == CKR_OK)
rval = tlen;
else
error("C_Sign failed: %lu", rv);
return (rval);
}
static int
pkcs11_rsa_private_decrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
int padding)
{
return (-1);
}
static int
pkcs11_rsa_start_wrapper(void)
{
if (rsa_method != NULL)
return (0);
rsa_method = RSA_meth_dup(RSA_get_default_method());
if (rsa_method == NULL)
return (-1);
rsa_idx = RSA_get_ex_new_index(0, "ssh-pkcs11-rsa",
NULL, NULL, pkcs11_k11_free);
if (rsa_idx == -1)
return (-1);
if (!RSA_meth_set1_name(rsa_method, "pkcs11") ||
!RSA_meth_set_priv_enc(rsa_method, pkcs11_rsa_private_encrypt) ||
!RSA_meth_set_priv_dec(rsa_method, pkcs11_rsa_private_decrypt)) {
error_f("setup pkcs11 method failed");
return (-1);
}
return (0);
}
/* redirect private key operations for rsa key to pkcs11 token */
static int
pkcs11_rsa_wrap(struct pkcs11_provider *provider, CK_ULONG slotidx,
CK_ATTRIBUTE *keyid_attrib, RSA *rsa)
{
struct pkcs11_key *k11;
if (pkcs11_rsa_start_wrapper() == -1)
return (-1);
k11 = xcalloc(1, sizeof(*k11));
k11->provider = provider;
provider->refcount++; /* provider referenced by RSA key */
k11->slotidx = slotidx;
/* identify key object on smartcard */
k11->keyid_len = keyid_attrib->ulValueLen;
if (k11->keyid_len > 0) {
k11->keyid = xmalloc(k11->keyid_len);
memcpy(k11->keyid, keyid_attrib->pValue, k11->keyid_len);
}
RSA_set_method(rsa, rsa_method);
RSA_set_ex_data(rsa, rsa_idx, k11);
return (0);
}
#ifdef HAVE_EC_KEY_METHOD_NEW
/* openssl callback doing the actual signing operation */
static ECDSA_SIG *
ecdsa_do_sign(const unsigned char *dgst, int dgst_len, const BIGNUM *inv,
const BIGNUM *rp, EC_KEY *ec)
{
struct pkcs11_key *k11;
struct pkcs11_slotinfo *si;
CK_FUNCTION_LIST *f;
CK_ULONG siglen = 0, bnlen;
CK_RV rv;
ECDSA_SIG *ret = NULL;
u_char *sig;
BIGNUM *r = NULL, *s = NULL;
if ((k11 = EC_KEY_get_ex_data(ec, ec_key_idx)) == NULL) {
ossl_error("EC_KEY_get_key_method_data failed for ec");
return (NULL);
}
if (pkcs11_get_key(k11, CKM_ECDSA) == -1) {
error("pkcs11_get_key failed");
return (NULL);
}
f = k11->provider->function_list;
si = &k11->provider->slotinfo[k11->slotidx];
siglen = ECDSA_size(ec);
sig = xmalloc(siglen);
/* XXX handle CKR_BUFFER_TOO_SMALL */
rv = f->C_Sign(si->session, (CK_BYTE *)dgst, dgst_len, sig, &siglen);
if (rv != CKR_OK) {
error("C_Sign failed: %lu", rv);
goto done;
}
if (siglen < 64 || siglen > 132 || siglen % 2) {
ossl_error("d2i_ECDSA_SIG failed");
goto done;
}
bnlen = siglen/2;
if ((ret = ECDSA_SIG_new()) == NULL) {
error("ECDSA_SIG_new failed");
goto done;
}
if ((r = BN_bin2bn(sig, bnlen, NULL)) == NULL ||
(s = BN_bin2bn(sig+bnlen, bnlen, NULL)) == NULL) {
ossl_error("d2i_ECDSA_SIG failed");
ECDSA_SIG_free(ret);
ret = NULL;
goto done;
}
if (!ECDSA_SIG_set0(ret, r, s)) {
error_f("ECDSA_SIG_set0 failed");
ECDSA_SIG_free(ret);
ret = NULL;
goto done;
}
r = s = NULL; /* now owned by ret */
/* success */
done:
BN_free(r);
BN_free(s);
free(sig);
return (ret);
}
static int
pkcs11_ecdsa_start_wrapper(void)
{
int (*orig_sign)(int, const unsigned char *, int, unsigned char *,
unsigned int *, const BIGNUM *, const BIGNUM *, EC_KEY *) = NULL;
if (ec_key_method != NULL)
return (0);
ec_key_idx = EC_KEY_get_ex_new_index(0, "ssh-pkcs11-ecdsa",
NULL, NULL, pkcs11_k11_free);
if (ec_key_idx == -1)
return (-1);
ec_key_method = EC_KEY_METHOD_new(EC_KEY_OpenSSL());
if (ec_key_method == NULL)
return (-1);
EC_KEY_METHOD_get_sign(ec_key_method, &orig_sign, NULL, NULL);
EC_KEY_METHOD_set_sign(ec_key_method, orig_sign, NULL, ecdsa_do_sign);
return (0);
}
static int
pkcs11_ecdsa_wrap(struct pkcs11_provider *provider, CK_ULONG slotidx,
CK_ATTRIBUTE *keyid_attrib, EC_KEY *ec)
{
struct pkcs11_key *k11;
if (pkcs11_ecdsa_start_wrapper() == -1)
return (-1);
k11 = xcalloc(1, sizeof(*k11));
k11->provider = provider;
provider->refcount++; /* provider referenced by ECDSA key */
k11->slotidx = slotidx;
/* identify key object on smartcard */
k11->keyid_len = keyid_attrib->ulValueLen;
k11->keyid = xmalloc(k11->keyid_len);
memcpy(k11->keyid, keyid_attrib->pValue, k11->keyid_len);
EC_KEY_set_method(ec, ec_key_method);
EC_KEY_set_ex_data(ec, ec_key_idx, k11);
return (0);
}
#endif /* HAVE_EC_KEY_METHOD_NEW */
/* remove trailing spaces */
static void
rmspace(u_char *buf, size_t len)
{
size_t i;
if (!len)
return;
for (i = len - 1; i > 0; i--)
if (i == len - 1 || buf[i] == ' ')
buf[i] = '\0';
else
break;
}
/*
* open a pkcs11 session and login if required.
* if pin == NULL we delay login until key use
*/
static int
pkcs11_open_session(struct pkcs11_provider *p, CK_ULONG slotidx, char *pin,
CK_ULONG user)
{
struct pkcs11_slotinfo *si;
CK_FUNCTION_LIST *f;
CK_RV rv;
CK_SESSION_HANDLE session;
int login_required, ret;
f = p->function_list;
si = &p->slotinfo[slotidx];
login_required = si->token.flags & CKF_LOGIN_REQUIRED;
/* fail early before opening session */
if (login_required && !pkcs11_interactive &&
(pin == NULL || strlen(pin) == 0)) {
error("pin required");
return (-SSH_PKCS11_ERR_PIN_REQUIRED);
}
if ((rv = f->C_OpenSession(p->slotlist[slotidx], CKF_RW_SESSION|
CKF_SERIAL_SESSION, NULL, NULL, &session)) != CKR_OK) {
error("C_OpenSession failed: %lu", rv);
return (-1);
}
if (login_required && pin != NULL && strlen(pin) != 0) {
rv = f->C_Login(session, user, (u_char *)pin, strlen(pin));
if (rv != CKR_OK && rv != CKR_USER_ALREADY_LOGGED_IN) {
error("C_Login failed: %lu", rv);
ret = (rv == CKR_PIN_LOCKED) ?
-SSH_PKCS11_ERR_PIN_LOCKED :
-SSH_PKCS11_ERR_LOGIN_FAIL;
if ((rv = f->C_CloseSession(session)) != CKR_OK)
error("C_CloseSession failed: %lu", rv);
return (ret);
}
si->logged_in = 1;
}
si->session = session;
return (0);
}
static int
pkcs11_key_included(struct sshkey ***keysp, int *nkeys, struct sshkey *key)
{
int i;
for (i = 0; i < *nkeys; i++)
if (sshkey_equal(key, (*keysp)[i]))
return (1);
return (0);
}
#ifdef HAVE_EC_KEY_METHOD_NEW
static struct sshkey *
pkcs11_fetch_ecdsa_pubkey(struct pkcs11_provider *p, CK_ULONG slotidx,
CK_OBJECT_HANDLE *obj)
{
CK_ATTRIBUTE key_attr[3];
CK_SESSION_HANDLE session;
CK_FUNCTION_LIST *f = NULL;
CK_RV rv;
ASN1_OCTET_STRING *octet = NULL;
EC_KEY *ec = NULL;
EC_GROUP *group = NULL;
struct sshkey *key = NULL;
const unsigned char *attrp = NULL;
int i;
int nid;
memset(&key_attr, 0, sizeof(key_attr));
key_attr[0].type = CKA_ID;
key_attr[1].type = CKA_EC_POINT;
key_attr[2].type = CKA_EC_PARAMS;
session = p->slotinfo[slotidx].session;
f = p->function_list;
/* figure out size of the attributes */
rv = f->C_GetAttributeValue(session, *obj, key_attr, 3);
if (rv != CKR_OK) {
error("C_GetAttributeValue failed: %lu", rv);
return (NULL);
}
/*
* Allow CKA_ID (always first attribute) to be empty, but
* ensure that none of the others are zero length.
* XXX assumes CKA_ID is always first.
*/
if (key_attr[1].ulValueLen == 0 ||
key_attr[2].ulValueLen == 0) {
error("invalid attribute length");
return (NULL);
}
/* allocate buffers for attributes */
for (i = 0; i < 3; i++)
if (key_attr[i].ulValueLen > 0)
key_attr[i].pValue = xcalloc(1, key_attr[i].ulValueLen);
/* retrieve ID, public point and curve parameters of EC key */
rv = f->C_GetAttributeValue(session, *obj, key_attr, 3);
if (rv != CKR_OK) {
error("C_GetAttributeValue failed: %lu", rv);
goto fail;
}
ec = EC_KEY_new();
if (ec == NULL) {
error("EC_KEY_new failed");
goto fail;
}
attrp = key_attr[2].pValue;
group = d2i_ECPKParameters(NULL, &attrp, key_attr[2].ulValueLen);
if (group == NULL) {
ossl_error("d2i_ECPKParameters failed");
goto fail;
}
if (EC_KEY_set_group(ec, group) == 0) {
ossl_error("EC_KEY_set_group failed");
goto fail;
}
if (key_attr[1].ulValueLen <= 2) {
error("CKA_EC_POINT too small");
goto fail;
}
attrp = key_attr[1].pValue;
octet = d2i_ASN1_OCTET_STRING(NULL, &attrp, key_attr[1].ulValueLen);
if (octet == NULL) {
ossl_error("d2i_ASN1_OCTET_STRING failed");
goto fail;
}
attrp = octet->data;
if (o2i_ECPublicKey(&ec, &attrp, octet->length) == NULL) {
ossl_error("o2i_ECPublicKey failed");
goto fail;
}
nid = sshkey_ecdsa_key_to_nid(ec);
if (nid < 0) {
error("couldn't get curve nid");
goto fail;
}
if (pkcs11_ecdsa_wrap(p, slotidx, &key_attr[0], ec))
goto fail;
key = sshkey_new(KEY_UNSPEC);
if (key == NULL) {
error("sshkey_new failed");
goto fail;
}
key->ecdsa = ec;
key->ecdsa_nid = nid;
key->type = KEY_ECDSA;
key->flags |= SSHKEY_FLAG_EXT;
ec = NULL; /* now owned by key */
fail:
for (i = 0; i < 3; i++)
free(key_attr[i].pValue);
if (ec)
EC_KEY_free(ec);
if (group)
EC_GROUP_free(group);
if (octet)
ASN1_OCTET_STRING_free(octet);
return (key);
}
#endif /* HAVE_EC_KEY_METHOD_NEW */
static struct sshkey *
pkcs11_fetch_rsa_pubkey(struct pkcs11_provider *p, CK_ULONG slotidx,
CK_OBJECT_HANDLE *obj)
{
CK_ATTRIBUTE key_attr[3];
CK_SESSION_HANDLE session;
CK_FUNCTION_LIST *f = NULL;
CK_RV rv;
RSA *rsa = NULL;
BIGNUM *rsa_n, *rsa_e;
struct sshkey *key = NULL;
int i;
memset(&key_attr, 0, sizeof(key_attr));
key_attr[0].type = CKA_ID;
key_attr[1].type = CKA_MODULUS;
key_attr[2].type = CKA_PUBLIC_EXPONENT;
session = p->slotinfo[slotidx].session;
f = p->function_list;
/* figure out size of the attributes */
rv = f->C_GetAttributeValue(session, *obj, key_attr, 3);
if (rv != CKR_OK) {
error("C_GetAttributeValue failed: %lu", rv);
return (NULL);
}
/*
* Allow CKA_ID (always first attribute) to be empty, but
* ensure that none of the others are zero length.
* XXX assumes CKA_ID is always first.
*/
if (key_attr[1].ulValueLen == 0 ||
key_attr[2].ulValueLen == 0) {
error("invalid attribute length");
return (NULL);
}
/* allocate buffers for attributes */
for (i = 0; i < 3; i++)
if (key_attr[i].ulValueLen > 0)
key_attr[i].pValue = xcalloc(1, key_attr[i].ulValueLen);
/* retrieve ID, modulus and public exponent of RSA key */
rv = f->C_GetAttributeValue(session, *obj, key_attr, 3);
if (rv != CKR_OK) {
error("C_GetAttributeValue failed: %lu", rv);
goto fail;
}
rsa = RSA_new();
if (rsa == NULL) {
error("RSA_new failed");
goto fail;
}
rsa_n = BN_bin2bn(key_attr[1].pValue, key_attr[1].ulValueLen, NULL);
rsa_e = BN_bin2bn(key_attr[2].pValue, key_attr[2].ulValueLen, NULL);
if (rsa_n == NULL || rsa_e == NULL) {
error("BN_bin2bn failed");
goto fail;
}
if (!RSA_set0_key(rsa, rsa_n, rsa_e, NULL))
fatal_f("set key");
rsa_n = rsa_e = NULL; /* transferred */
if (pkcs11_rsa_wrap(p, slotidx, &key_attr[0], rsa))
goto fail;
key = sshkey_new(KEY_UNSPEC);
if (key == NULL) {
error("sshkey_new failed");
goto fail;
}
key->rsa = rsa;
key->type = KEY_RSA;
key->flags |= SSHKEY_FLAG_EXT;
rsa = NULL; /* now owned by key */
fail:
for (i = 0; i < 3; i++)
free(key_attr[i].pValue);
RSA_free(rsa);
return (key);
}
static int
pkcs11_fetch_x509_pubkey(struct pkcs11_provider *p, CK_ULONG slotidx,
CK_OBJECT_HANDLE *obj, struct sshkey **keyp, char **labelp)
{
CK_ATTRIBUTE cert_attr[3];
CK_SESSION_HANDLE session;
CK_FUNCTION_LIST *f = NULL;
CK_RV rv;
X509 *x509 = NULL;
X509_NAME *x509_name = NULL;
EVP_PKEY *evp;
RSA *rsa = NULL;
#ifdef OPENSSL_HAS_ECC
EC_KEY *ec = NULL;
#endif
struct sshkey *key = NULL;
int i;
#ifdef HAVE_EC_KEY_METHOD_NEW
int nid;
#endif
const u_char *cp;
char *subject = NULL;
*keyp = NULL;
*labelp = NULL;
memset(&cert_attr, 0, sizeof(cert_attr));
cert_attr[0].type = CKA_ID;
cert_attr[1].type = CKA_SUBJECT;
cert_attr[2].type = CKA_VALUE;
session = p->slotinfo[slotidx].session;
f = p->function_list;
/* figure out size of the attributes */
rv = f->C_GetAttributeValue(session, *obj, cert_attr, 3);
if (rv != CKR_OK) {
error("C_GetAttributeValue failed: %lu", rv);
return -1;
}
/*
* Allow CKA_ID (always first attribute) to be empty, but
* ensure that none of the others are zero length.
* XXX assumes CKA_ID is always first.
*/
if (cert_attr[1].ulValueLen == 0 ||
cert_attr[2].ulValueLen == 0) {
error("invalid attribute length");
return -1;
}
/* allocate buffers for attributes */
for (i = 0; i < 3; i++)
if (cert_attr[i].ulValueLen > 0)
cert_attr[i].pValue = xcalloc(1, cert_attr[i].ulValueLen);
/* retrieve ID, subject and value of certificate */
rv = f->C_GetAttributeValue(session, *obj, cert_attr, 3);
if (rv != CKR_OK) {
error("C_GetAttributeValue failed: %lu", rv);
goto out;
}
/* Decode DER-encoded cert subject */
cp = cert_attr[1].pValue;
if ((x509_name = d2i_X509_NAME(NULL, &cp,
cert_attr[1].ulValueLen)) == NULL ||
(subject = X509_NAME_oneline(x509_name, NULL, 0)) == NULL)
subject = xstrdup("invalid subject");
X509_NAME_free(x509_name);
cp = cert_attr[2].pValue;
if ((x509 = d2i_X509(NULL, &cp, cert_attr[2].ulValueLen)) == NULL) {
error("d2i_x509 failed");
goto out;
}
if ((evp = X509_get_pubkey(x509)) == NULL) {
error("X509_get_pubkey failed");
goto out;
}
if (EVP_PKEY_base_id(evp) == EVP_PKEY_RSA) {
if (EVP_PKEY_get0_RSA(evp) == NULL) {
error("invalid x509; no rsa key");
goto out;
}
if ((rsa = RSAPublicKey_dup(EVP_PKEY_get0_RSA(evp))) == NULL) {
error("RSAPublicKey_dup failed");