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-rw-r--r--ssh-pkcs11.c1887
1 files changed, 1887 insertions, 0 deletions
diff --git a/ssh-pkcs11.c b/ssh-pkcs11.c
new file mode 100644
index 0000000..b2e2b32
--- /dev/null
+++ b/ssh-pkcs11.c
@@ -0,0 +1,1887 @@
+/* $OpenBSD: ssh-pkcs11.c,v 1.55 2021/11/18 21:11:01 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;
+
+#if defined(OPENSSL_HAS_ECC) && defined(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 /* OPENSSL_HAS_ECC && 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_f("provider \"%s\" refcount %d valid %d",
+ p->name, 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_f("provider \"%s\" refcount %d", p->name, p->refcount);
+ if (--p->refcount <= 0) {
+ if (p->valid)
+ error_f("provider \"%s\" still valid", p->name);
+ 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 provider \"%s\"", 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;
+#if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
+static EC_KEY_METHOD *ec_key_method;
+static int ec_key_idx = 0;
+#endif /* OPENSSL_HAS_ECC && HAVE_EC_KEY_METHOD_NEW */
+
+/* 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 \"%s\" slot %lu object %lu: attrib %lu = %d",
+ k11->provider->name, 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");
+ 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);
+}
+
+#if defined(OPENSSL_HAS_ECC) && defined(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;
+ if (k11->keyid_len > 0) {
+ 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 /* OPENSSL_HAS_ECC && 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);
+}
+
+#if defined(OPENSSL_HAS_ECC) && defined(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 /* OPENSSL_HAS_ECC && 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;
+#if defined(OPENSSL_HAS_ECC) && defined(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");
+ goto out;
+ }
+
+ if (pkcs11_rsa_wrap(p, slotidx, &cert_attr[0], rsa))
+ goto out;
+
+ key = sshkey_new(KEY_UNSPEC);
+ if (key == NULL) {
+ error("sshkey_new failed");
+ goto out;
+ }
+
+ key->rsa = rsa;
+ key->type = KEY_RSA;
+ key->flags |= SSHKEY_FLAG_EXT;
+ rsa = NULL; /* now owned by key */
+#if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
+ } else if (EVP_PKEY_base_id(evp) == EVP_PKEY_EC) {
+ if (EVP_PKEY_get0_EC_KEY(evp) == NULL) {
+ error("invalid x509; no ec key");
+ goto out;
+ }
+ if ((ec = EC_KEY_dup(EVP_PKEY_get0_EC_KEY(evp))) == NULL) {
+ error("EC_KEY_dup failed");
+ goto out;
+ }
+
+ nid = sshkey_ecdsa_key_to_nid(ec);
+ if (nid < 0) {
+ error("couldn't get curve nid");
+ goto out;
+ }
+
+ if (pkcs11_ecdsa_wrap(p, slotidx, &cert_attr[0], ec))
+ goto out;
+
+ key = sshkey_new(KEY_UNSPEC);
+ if (key == NULL) {
+ error("sshkey_new failed");
+ goto out;
+ }
+
+ key->ecdsa = ec;
+ key->ecdsa_nid = nid;
+ key->type = KEY_ECDSA;
+ key->flags |= SSHKEY_FLAG_EXT;
+ ec = NULL; /* now owned by key */
+#endif /* OPENSSL_HAS_ECC && HAVE_EC_KEY_METHOD_NEW */
+ } else {
+ error("unknown certificate key type");
+ goto out;
+ }
+ out:
+ for (i = 0; i < 3; i++)
+ free(cert_attr[i].pValue);
+ X509_free(x509);
+ RSA_free(rsa);
+#ifdef OPENSSL_HAS_ECC
+ EC_KEY_free(ec);
+#endif
+ if (key == NULL) {
+ free(subject);
+ return -1;
+ }
+ /* success */
+ *keyp = key;
+ *labelp = subject;
+ return 0;
+}
+
+#if 0
+static int
+have_rsa_key(const RSA *rsa)
+{
+ const BIGNUM *rsa_n, *rsa_e;
+
+ RSA_get0_key(rsa, &rsa_n, &rsa_e, NULL);
+ return rsa_n != NULL && rsa_e != NULL;
+}
+#endif
+
+static void
+note_key(struct pkcs11_provider *p, CK_ULONG slotidx, const char *context,
+ struct sshkey *key)
+{
+ char *fp;
+
+ if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
+ SSH_FP_DEFAULT)) == NULL) {
+ error_f("sshkey_fingerprint failed");
+ return;
+ }
+ debug2("%s: provider %s slot %lu: %s %s", context, p->name,
+ (u_long)slotidx, sshkey_type(key), fp);
+ free(fp);
+}
+
+/*
+ * lookup certificates for token in slot identified by slotidx,
+ * add 'wrapped' public keys to the 'keysp' array and increment nkeys.
+ * keysp points to an (possibly empty) array with *nkeys keys.
+ */
+static int
+pkcs11_fetch_certs(struct pkcs11_provider *p, CK_ULONG slotidx,
+ struct sshkey ***keysp, char ***labelsp, int *nkeys)
+{
+ struct sshkey *key = NULL;
+ CK_OBJECT_CLASS key_class;
+ CK_ATTRIBUTE key_attr[1];
+ CK_SESSION_HANDLE session;
+ CK_FUNCTION_LIST *f = NULL;
+ CK_RV rv;
+ CK_OBJECT_HANDLE obj;
+ CK_ULONG n = 0;
+ int ret = -1;
+ char *label;
+
+ memset(&key_attr, 0, sizeof(key_attr));
+ memset(&obj, 0, sizeof(obj));
+
+ key_class = CKO_CERTIFICATE;
+ key_attr[0].type = CKA_CLASS;
+ key_attr[0].pValue = &key_class;
+ key_attr[0].ulValueLen = sizeof(key_class);
+
+ session = p->slotinfo[slotidx].session;
+ f = p->function_list;
+
+ rv = f->C_FindObjectsInit(session, key_attr, 1);
+ if (rv != CKR_OK) {
+ error("C_FindObjectsInit failed: %lu", rv);
+ goto fail;
+ }
+
+ while (1) {
+ CK_CERTIFICATE_TYPE ck_cert_type;
+
+ rv = f->C_FindObjects(session, &obj, 1, &n);
+ if (rv != CKR_OK) {
+ error("C_FindObjects failed: %lu", rv);
+ goto fail;
+ }
+ if (n == 0)
+ break;
+
+ memset(&ck_cert_type, 0, sizeof(ck_cert_type));
+ memset(&key_attr, 0, sizeof(key_attr));
+ key_attr[0].type = CKA_CERTIFICATE_TYPE;
+ key_attr[0].pValue = &ck_cert_type;
+ key_attr[0].ulValueLen = sizeof(ck_cert_type);
+
+ rv = f->C_GetAttributeValue(session, obj, key_attr, 1);
+ if (rv != CKR_OK) {
+ error("C_GetAttributeValue failed: %lu", rv);
+ goto fail;
+ }
+
+ key = NULL;
+ label = NULL;
+ switch (ck_cert_type) {
+ case CKC_X_509:
+ if (pkcs11_fetch_x509_pubkey(p, slotidx, &obj,
+ &key, &label) != 0) {
+ error("failed to fetch key");
+ continue;
+ }
+ break;
+ default:
+ error("skipping unsupported certificate type %lu",
+ ck_cert_type);
+ continue;
+ }
+ note_key(p, slotidx, __func__, key);
+ if (pkcs11_key_included(keysp, nkeys, key)) {
+ debug2_f("key already included");;
+ sshkey_free(key);
+ } else {
+ /* expand key array and add key */
+ *keysp = xrecallocarray(*keysp, *nkeys,
+ *nkeys + 1, sizeof(struct sshkey *));
+ (*keysp)[*nkeys] = key;
+ if (labelsp != NULL) {
+ *labelsp = xrecallocarray(*labelsp, *nkeys,
+ *nkeys + 1, sizeof(char *));
+ (*labelsp)[*nkeys] = xstrdup((char *)label);
+ }
+ *nkeys = *nkeys + 1;
+ debug("have %d keys", *nkeys);
+ }
+ }
+
+ ret = 0;
+fail:
+ rv = f->C_FindObjectsFinal(session);
+ if (rv != CKR_OK) {
+ error("C_FindObjectsFinal failed: %lu", rv);
+ ret = -1;
+ }
+
+ return (ret);
+}
+
+/*
+ * lookup public keys for token in slot identified by slotidx,
+ * add 'wrapped' public keys to the 'keysp' array and increment nkeys.
+ * keysp points to an (possibly empty) array with *nkeys keys.
+ */
+static int
+pkcs11_fetch_keys(struct pkcs11_provider *p, CK_ULONG slotidx,
+ struct sshkey ***keysp, char ***labelsp, int *nkeys)
+{
+ struct sshkey *key = NULL;
+ CK_OBJECT_CLASS key_class;
+ CK_ATTRIBUTE key_attr[2];
+ CK_SESSION_HANDLE session;
+ CK_FUNCTION_LIST *f = NULL;
+ CK_RV rv;
+ CK_OBJECT_HANDLE obj;
+ CK_ULONG n = 0;
+ int ret = -1;
+
+ memset(&key_attr, 0, sizeof(key_attr));
+ memset(&obj, 0, sizeof(obj));
+
+ key_class = CKO_PUBLIC_KEY;
+ key_attr[0].type = CKA_CLASS;
+ key_attr[0].pValue = &key_class;
+ key_attr[0].ulValueLen = sizeof(key_class);
+
+ session = p->slotinfo[slotidx].session;
+ f = p->function_list;
+
+ rv = f->C_FindObjectsInit(session, key_attr, 1);
+ if (rv != CKR_OK) {
+ error("C_FindObjectsInit failed: %lu", rv);
+ goto fail;
+ }
+
+ while (1) {
+ CK_KEY_TYPE ck_key_type;
+ CK_UTF8CHAR label[256];
+
+ rv = f->C_FindObjects(session, &obj, 1, &n);
+ if (rv != CKR_OK) {
+ error("C_FindObjects failed: %lu", rv);
+ goto fail;
+ }
+ if (n == 0)
+ break;
+
+ memset(&ck_key_type, 0, sizeof(ck_key_type));
+ memset(&key_attr, 0, sizeof(key_attr));
+ key_attr[0].type = CKA_KEY_TYPE;
+ key_attr[0].pValue = &ck_key_type;
+ key_attr[0].ulValueLen = sizeof(ck_key_type);
+ key_attr[1].type = CKA_LABEL;
+ key_attr[1].pValue = &label;
+ key_attr[1].ulValueLen = sizeof(label) - 1;
+
+ rv = f->C_GetAttributeValue(session, obj, key_attr, 2);
+ if (rv != CKR_OK) {
+ error("C_GetAttributeValue failed: %lu", rv);
+ goto fail;
+ }
+
+ label[key_attr[1].ulValueLen] = '\0';
+
+ switch (ck_key_type) {
+ case CKK_RSA:
+ key = pkcs11_fetch_rsa_pubkey(p, slotidx, &obj);
+ break;
+#if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
+ case CKK_ECDSA:
+ key = pkcs11_fetch_ecdsa_pubkey(p, slotidx, &obj);
+ break;
+#endif /* OPENSSL_HAS_ECC && HAVE_EC_KEY_METHOD_NEW */
+ default:
+ /* XXX print key type? */
+ key = NULL;
+ error("skipping unsupported key type");
+ }
+
+ if (key == NULL) {
+ error("failed to fetch key");
+ continue;
+ }
+ note_key(p, slotidx, __func__, key);
+ if (pkcs11_key_included(keysp, nkeys, key)) {
+ debug2_f("key already included");;
+ sshkey_free(key);
+ } else {
+ /* expand key array and add key */
+ *keysp = xrecallocarray(*keysp, *nkeys,
+ *nkeys + 1, sizeof(struct sshkey *));
+ (*keysp)[*nkeys] = key;
+ if (labelsp != NULL) {
+ *labelsp = xrecallocarray(*labelsp, *nkeys,
+ *nkeys + 1, sizeof(char *));
+ (*labelsp)[*nkeys] = xstrdup((char *)label);
+ }
+ *nkeys = *nkeys + 1;
+ debug("have %d keys", *nkeys);
+ }
+ }
+
+ ret = 0;
+fail:
+ rv = f->C_FindObjectsFinal(session);
+ if (rv != CKR_OK) {
+ error("C_FindObjectsFinal failed: %lu", rv);
+ ret = -1;
+ }
+
+ return (ret);
+}
+
+#ifdef WITH_PKCS11_KEYGEN
+#define FILL_ATTR(attr, idx, typ, val, len) \
+ { (attr[idx]).type=(typ); (attr[idx]).pValue=(val); (attr[idx]).ulValueLen=len; idx++; }
+
+static struct sshkey *
+pkcs11_rsa_generate_private_key(struct pkcs11_provider *p, CK_ULONG slotidx,
+ char *label, CK_ULONG bits, CK_BYTE keyid, u_int32_t *err)
+{
+ struct pkcs11_slotinfo *si;
+ char *plabel = label ? label : "";
+ int npub = 0, npriv = 0;
+ CK_RV rv;
+ CK_FUNCTION_LIST *f;
+ CK_SESSION_HANDLE session;
+ CK_BBOOL true_val = CK_TRUE, false_val = CK_FALSE;
+ CK_OBJECT_HANDLE pubKey, privKey;
+ CK_ATTRIBUTE tpub[16], tpriv[16];
+ CK_MECHANISM mech = {
+ CKM_RSA_PKCS_KEY_PAIR_GEN, NULL_PTR, 0
+ };
+ CK_BYTE pubExponent[] = {
+ 0x01, 0x00, 0x01 /* RSA_F4 in bytes */
+ };
+ pubkey_filter[0].pValue = &pubkey_class;
+ cert_filter[0].pValue = &cert_class;
+
+ *err = 0;
+
+ FILL_ATTR(tpub, npub, CKA_TOKEN, &true_val, sizeof(true_val));
+ FILL_ATTR(tpub, npub, CKA_LABEL, plabel, strlen(plabel));
+ FILL_ATTR(tpub, npub, CKA_ENCRYPT, &false_val, sizeof(false_val));
+ FILL_ATTR(tpub, npub, CKA_VERIFY, &true_val, sizeof(true_val));
+ FILL_ATTR(tpub, npub, CKA_VERIFY_RECOVER, &false_val,
+ sizeof(false_val));
+ FILL_ATTR(tpub, npub, CKA_WRAP, &false_val, sizeof(false_val));
+ FILL_ATTR(tpub, npub, CKA_DERIVE, &false_val, sizeof(false_val));
+ FILL_ATTR(tpub, npub, CKA_MODULUS_BITS, &bits, sizeof(bits));
+ FILL_ATTR(tpub, npub, CKA_PUBLIC_EXPONENT, pubExponent,
+ sizeof(pubExponent));
+ FILL_ATTR(tpub, npub, CKA_ID, &keyid, sizeof(keyid));
+
+ FILL_ATTR(tpriv, npriv, CKA_TOKEN, &true_val, sizeof(true_val));
+ FILL_ATTR(tpriv, npriv, CKA_LABEL, plabel, strlen(plabel));
+ FILL_ATTR(tpriv, npriv, CKA_PRIVATE, &true_val, sizeof(true_val));
+ FILL_ATTR(tpriv, npriv, CKA_SENSITIVE, &true_val, sizeof(true_val));
+ FILL_ATTR(tpriv, npriv, CKA_DECRYPT, &false_val, sizeof(false_val));
+ FILL_ATTR(tpriv, npriv, CKA_SIGN, &true_val, sizeof(true_val));
+ FILL_ATTR(tpriv, npriv, CKA_SIGN_RECOVER, &false_val,
+ sizeof(false_val));
+ FILL_ATTR(tpriv, npriv, CKA_UNWRAP, &false_val, sizeof(false_val));
+ FILL_ATTR(tpriv, npriv, CKA_DERIVE, &false_val, sizeof(false_val));
+ FILL_ATTR(tpriv, npriv, CKA_ID, &keyid, sizeof(keyid));
+
+ f = p->function_list;
+ si = &p->slotinfo[slotidx];
+ session = si->session;
+
+ if ((rv = f->C_GenerateKeyPair(session, &mech, tpub, npub, tpriv, npriv,
+ &pubKey, &privKey)) != CKR_OK) {
+ error_f("key generation failed: error 0x%lx", rv);
+ *err = rv;
+ return NULL;
+ }
+
+ return pkcs11_fetch_rsa_pubkey(p, slotidx, &pubKey);
+}
+
+static int
+pkcs11_decode_hex(const char *hex, unsigned char **dest, size_t *rlen)
+{
+ size_t i, len;
+ char ptr[3];
+
+ if (dest)
+ *dest = NULL;
+ if (rlen)
+ *rlen = 0;
+
+ if ((len = strlen(hex)) % 2)
+ return -1;
+ len /= 2;
+
+ *dest = xmalloc(len);
+
+ ptr[2] = '\0';
+ for (i = 0; i < len; i++) {
+ ptr[0] = hex[2 * i];
+ ptr[1] = hex[(2 * i) + 1];
+ if (!isxdigit(ptr[0]) || !isxdigit(ptr[1]))
+ return -1;
+ (*dest)[i] = (unsigned char)strtoul(ptr, NULL, 16);
+ }
+
+ if (rlen)
+ *rlen = len;
+
+ return 0;
+}
+
+static struct ec_curve_info {
+ const char *name;
+ const char *oid;
+ const char *oid_encoded;
+ size_t size;
+} ec_curve_infos[] = {
+ {"prime256v1", "1.2.840.10045.3.1.7", "06082A8648CE3D030107", 256},
+ {"secp384r1", "1.3.132.0.34", "06052B81040022", 384},
+ {"secp521r1", "1.3.132.0.35", "06052B81040023", 521},
+ {NULL, NULL, NULL, 0},
+};
+
+static struct sshkey *
+pkcs11_ecdsa_generate_private_key(struct pkcs11_provider *p, CK_ULONG slotidx,
+ char *label, CK_ULONG bits, CK_BYTE keyid, u_int32_t *err)
+{
+ struct pkcs11_slotinfo *si;
+ char *plabel = label ? label : "";
+ int i;
+ size_t ecparams_size;
+ unsigned char *ecparams = NULL;
+ int npub = 0, npriv = 0;
+ CK_RV rv;
+ CK_FUNCTION_LIST *f;
+ CK_SESSION_HANDLE session;
+ CK_BBOOL true_val = CK_TRUE, false_val = CK_FALSE;
+ CK_OBJECT_HANDLE pubKey, privKey;
+ CK_MECHANISM mech = {
+ CKM_EC_KEY_PAIR_GEN, NULL_PTR, 0
+ };
+ CK_ATTRIBUTE tpub[16], tpriv[16];
+
+ *err = 0;
+
+ for (i = 0; ec_curve_infos[i].name; i++) {
+ if (ec_curve_infos[i].size == bits)
+ break;
+ }
+ if (!ec_curve_infos[i].name) {
+ error_f("invalid key size %lu", bits);
+ return NULL;
+ }
+ if (pkcs11_decode_hex(ec_curve_infos[i].oid_encoded, &ecparams,
+ &ecparams_size) == -1) {
+ error_f("invalid oid");
+ return NULL;
+ }
+
+ FILL_ATTR(tpub, npub, CKA_TOKEN, &true_val, sizeof(true_val));
+ FILL_ATTR(tpub, npub, CKA_LABEL, plabel, strlen(plabel));
+ FILL_ATTR(tpub, npub, CKA_ENCRYPT, &false_val, sizeof(false_val));
+ FILL_ATTR(tpub, npub, CKA_VERIFY, &true_val, sizeof(true_val));
+ FILL_ATTR(tpub, npub, CKA_VERIFY_RECOVER, &false_val,
+ sizeof(false_val));
+ FILL_ATTR(tpub, npub, CKA_WRAP, &false_val, sizeof(false_val));
+ FILL_ATTR(tpub, npub, CKA_DERIVE, &false_val, sizeof(false_val));
+ FILL_ATTR(tpub, npub, CKA_EC_PARAMS, ecparams, ecparams_size);
+ FILL_ATTR(tpub, npub, CKA_ID, &keyid, sizeof(keyid));
+
+ FILL_ATTR(tpriv, npriv, CKA_TOKEN, &true_val, sizeof(true_val));
+ FILL_ATTR(tpriv, npriv, CKA_LABEL, plabel, strlen(plabel));
+ FILL_ATTR(tpriv, npriv, CKA_PRIVATE, &true_val, sizeof(true_val));
+ FILL_ATTR(tpriv, npriv, CKA_SENSITIVE, &true_val, sizeof(true_val));
+ FILL_ATTR(tpriv, npriv, CKA_DECRYPT, &false_val, sizeof(false_val));
+ FILL_ATTR(tpriv, npriv, CKA_SIGN, &true_val, sizeof(true_val));
+ FILL_ATTR(tpriv, npriv, CKA_SIGN_RECOVER, &false_val,
+ sizeof(false_val));
+ FILL_ATTR(tpriv, npriv, CKA_UNWRAP, &false_val, sizeof(false_val));
+ FILL_ATTR(tpriv, npriv, CKA_DERIVE, &false_val, sizeof(false_val));
+ FILL_ATTR(tpriv, npriv, CKA_ID, &keyid, sizeof(keyid));
+
+ f = p->function_list;
+ si = &p->slotinfo[slotidx];
+ session = si->session;
+
+ if ((rv = f->C_GenerateKeyPair(session, &mech, tpub, npub, tpriv, npriv,
+ &pubKey, &privKey)) != CKR_OK) {
+ error_f("key generation failed: error 0x%lx", rv);
+ *err = rv;
+ return NULL;
+ }
+
+ return pkcs11_fetch_ecdsa_pubkey(p, slotidx, &pubKey);
+}
+#endif /* WITH_PKCS11_KEYGEN */
+
+/*
+ * register a new provider, fails if provider already exists. if
+ * keyp is provided, fetch keys.
+ */
+static int
+pkcs11_register_provider(char *provider_id, char *pin,
+ struct sshkey ***keyp, char ***labelsp,
+ struct pkcs11_provider **providerp, CK_ULONG user)
+{
+ int nkeys, need_finalize = 0;
+ int ret = -1;
+ struct pkcs11_provider *p = NULL;
+ void *handle = NULL;
+ CK_RV (*getfunctionlist)(CK_FUNCTION_LIST **);
+ CK_RV rv;
+ CK_FUNCTION_LIST *f = NULL;
+ CK_TOKEN_INFO *token;
+ CK_ULONG i;
+
+ if (providerp == NULL)
+ goto fail;
+ *providerp = NULL;
+
+ if (keyp != NULL)
+ *keyp = NULL;
+ if (labelsp != NULL)
+ *labelsp = NULL;
+
+ if (pkcs11_provider_lookup(provider_id) != NULL) {
+ debug_f("provider already registered: %s", provider_id);
+ goto fail;
+ }
+ /* open shared pkcs11-library */
+ if ((handle = dlopen(provider_id, RTLD_NOW)) == NULL) {
+ error("dlopen %s failed: %s", provider_id, dlerror());
+ goto fail;
+ }
+ if ((getfunctionlist = dlsym(handle, "C_GetFunctionList")) == NULL) {
+ error("dlsym(C_GetFunctionList) failed: %s", dlerror());
+ goto fail;
+ }
+ p = xcalloc(1, sizeof(*p));
+ p->name = xstrdup(provider_id);
+ p->handle = handle;
+ /* setup the pkcs11 callbacks */
+ if ((rv = (*getfunctionlist)(&f)) != CKR_OK) {
+ error("C_GetFunctionList for provider %s failed: %lu",
+ provider_id, rv);
+ goto fail;
+ }
+ p->function_list = f;
+ if ((rv = f->C_Initialize(NULL)) != CKR_OK) {
+ error("C_Initialize for provider %s failed: %lu",
+ provider_id, rv);
+ goto fail;
+ }
+ need_finalize = 1;
+ if ((rv = f->C_GetInfo(&p->info)) != CKR_OK) {
+ error("C_GetInfo for provider %s failed: %lu",
+ provider_id, rv);
+ goto fail;
+ }
+ rmspace(p->info.manufacturerID, sizeof(p->info.manufacturerID));
+ rmspace(p->info.libraryDescription, sizeof(p->info.libraryDescription));
+ debug("provider %s: manufacturerID <%s> cryptokiVersion %d.%d"
+ " libraryDescription <%s> libraryVersion %d.%d",
+ provider_id,
+ p->info.manufacturerID,
+ p->info.cryptokiVersion.major,
+ p->info.cryptokiVersion.minor,
+ p->info.libraryDescription,
+ p->info.libraryVersion.major,
+ p->info.libraryVersion.minor);
+ if ((rv = f->C_GetSlotList(CK_TRUE, NULL, &p->nslots)) != CKR_OK) {
+ error("C_GetSlotList failed: %lu", rv);
+ goto fail;
+ }
+ if (p->nslots == 0) {
+ debug_f("provider %s returned no slots", provider_id);
+ ret = -SSH_PKCS11_ERR_NO_SLOTS;
+ goto fail;
+ }
+ p->slotlist = xcalloc(p->nslots, sizeof(CK_SLOT_ID));
+ if ((rv = f->C_GetSlotList(CK_TRUE, p->slotlist, &p->nslots))
+ != CKR_OK) {
+ error("C_GetSlotList for provider %s failed: %lu",
+ provider_id, rv);
+ goto fail;
+ }
+ p->slotinfo = xcalloc(p->nslots, sizeof(struct pkcs11_slotinfo));
+ p->valid = 1;
+ nkeys = 0;
+ for (i = 0; i < p->nslots; i++) {
+ token = &p->slotinfo[i].token;
+ if ((rv = f->C_GetTokenInfo(p->slotlist[i], token))
+ != CKR_OK) {
+ error("C_GetTokenInfo for provider %s slot %lu "
+ "failed: %lu", provider_id, (u_long)i, rv);
+ continue;
+ }
+ if ((token->flags & CKF_TOKEN_INITIALIZED) == 0) {
+ debug2_f("ignoring uninitialised token in "
+ "provider %s slot %lu", provider_id, (u_long)i);
+ continue;
+ }
+ rmspace(token->label, sizeof(token->label));
+ rmspace(token->manufacturerID, sizeof(token->manufacturerID));
+ rmspace(token->model, sizeof(token->model));
+ rmspace(token->serialNumber, sizeof(token->serialNumber));
+ debug("provider %s slot %lu: label <%s> manufacturerID <%s> "
+ "model <%s> serial <%s> flags 0x%lx",
+ provider_id, (unsigned long)i,
+ token->label, token->manufacturerID, token->model,
+ token->serialNumber, token->flags);
+ /*
+ * open session, login with pin and retrieve public
+ * keys (if keyp is provided)
+ */
+ if ((ret = pkcs11_open_session(p, i, pin, user)) != 0 ||
+ keyp == NULL)
+ continue;
+ pkcs11_fetch_keys(p, i, keyp, labelsp, &nkeys);
+ pkcs11_fetch_certs(p, i, keyp, labelsp, &nkeys);
+ if (nkeys == 0 && !p->slotinfo[i].logged_in &&
+ pkcs11_interactive) {
+ /*
+ * Some tokens require login before they will
+ * expose keys.
+ */
+ if (pkcs11_login_slot(p, &p->slotinfo[i],
+ CKU_USER) < 0) {
+ error("login failed");
+ continue;
+ }
+ pkcs11_fetch_keys(p, i, keyp, labelsp, &nkeys);
+ pkcs11_fetch_certs(p, i, keyp, labelsp, &nkeys);
+ }
+ }
+
+ /* now owned by caller */
+ *providerp = p;
+
+ TAILQ_INSERT_TAIL(&pkcs11_providers, p, next);
+ p->refcount++; /* add to provider list */
+
+ return (nkeys);
+fail:
+ if (need_finalize && (rv = f->C_Finalize(NULL)) != CKR_OK)
+ error("C_Finalize for provider %s failed: %lu",
+ provider_id, rv);
+ if (p) {
+ free(p->name);
+ free(p->slotlist);
+ free(p->slotinfo);
+ free(p);
+ }
+ if (handle)
+ dlclose(handle);
+ if (ret > 0)
+ ret = -1;
+ return (ret);
+}
+
+/*
+ * register a new provider and get number of keys hold by the token,
+ * fails if provider already exists
+ */
+int
+pkcs11_add_provider(char *provider_id, char *pin, struct sshkey ***keyp,
+ char ***labelsp)
+{
+ struct pkcs11_provider *p = NULL;
+ int nkeys;
+
+ nkeys = pkcs11_register_provider(provider_id, pin, keyp, labelsp,
+ &p, CKU_USER);
+
+ /* no keys found or some other error, de-register provider */
+ if (nkeys <= 0 && p != NULL) {
+ TAILQ_REMOVE(&pkcs11_providers, p, next);
+ pkcs11_provider_finalize(p);
+ pkcs11_provider_unref(p);
+ }
+ if (nkeys == 0)
+ debug_f("provider %s returned no keys", provider_id);
+
+ return (nkeys);
+}
+
+#ifdef WITH_PKCS11_KEYGEN
+struct sshkey *
+pkcs11_gakp(char *provider_id, char *pin, unsigned int slotidx, char *label,
+ unsigned int type, unsigned int bits, unsigned char keyid, u_int32_t *err)
+{
+ struct pkcs11_provider *p = NULL;
+ struct pkcs11_slotinfo *si;
+ CK_FUNCTION_LIST *f;
+ CK_SESSION_HANDLE session;
+ struct sshkey *k = NULL;
+ int ret = -1, reset_pin = 0, reset_provider = 0;
+ CK_RV rv;
+
+ *err = 0;
+
+ if ((p = pkcs11_provider_lookup(provider_id)) != NULL)
+ debug_f("provider \"%s\" available", provider_id);
+ else if ((ret = pkcs11_register_provider(provider_id, pin, NULL, NULL,
+ &p, CKU_SO)) < 0) {
+ debug_f("could not register provider %s", provider_id);
+ goto out;
+ } else
+ reset_provider = 1;
+
+ f = p->function_list;
+ si = &p->slotinfo[slotidx];
+ session = si->session;
+
+ if ((rv = f->C_SetOperationState(session , pin, strlen(pin),
+ CK_INVALID_HANDLE, CK_INVALID_HANDLE)) != CKR_OK) {
+ debug_f("could not supply SO pin: %lu", rv);
+ reset_pin = 0;
+ } else
+ reset_pin = 1;
+
+ switch (type) {
+ case KEY_RSA:
+ if ((k = pkcs11_rsa_generate_private_key(p, slotidx, label,
+ bits, keyid, err)) == NULL) {
+ debug_f("failed to generate RSA key");
+ goto out;
+ }
+ break;
+ case KEY_ECDSA:
+ if ((k = pkcs11_ecdsa_generate_private_key(p, slotidx, label,
+ bits, keyid, err)) == NULL) {
+ debug_f("failed to generate ECDSA key");
+ goto out;
+ }
+ break;
+ default:
+ *err = SSH_PKCS11_ERR_GENERIC;
+ debug_f("unknown type %d", type);
+ goto out;
+ }
+
+out:
+ if (reset_pin)
+ f->C_SetOperationState(session , NULL, 0, CK_INVALID_HANDLE,
+ CK_INVALID_HANDLE);
+
+ if (reset_provider)
+ pkcs11_del_provider(provider_id);
+
+ return (k);
+}
+
+struct sshkey *
+pkcs11_destroy_keypair(char *provider_id, char *pin, unsigned long slotidx,
+ unsigned char keyid, u_int32_t *err)
+{
+ struct pkcs11_provider *p = NULL;
+ struct pkcs11_slotinfo *si;
+ struct sshkey *k = NULL;
+ int reset_pin = 0, reset_provider = 0;
+ CK_ULONG nattrs;
+ CK_FUNCTION_LIST *f;
+ CK_SESSION_HANDLE session;
+ CK_ATTRIBUTE attrs[16];
+ CK_OBJECT_CLASS key_class;
+ CK_KEY_TYPE key_type;
+ CK_OBJECT_HANDLE obj = CK_INVALID_HANDLE;
+ CK_RV rv;
+
+ *err = 0;
+
+ if ((p = pkcs11_provider_lookup(provider_id)) != NULL) {
+ debug_f("using provider \"%s\"", provider_id);
+ } else if (pkcs11_register_provider(provider_id, pin, NULL, NULL, &p,
+ CKU_SO) < 0) {
+ debug_f("could not register provider %s",
+ provider_id);
+ goto out;
+ } else
+ reset_provider = 1;
+
+ f = p->function_list;
+ si = &p->slotinfo[slotidx];
+ session = si->session;
+
+ if ((rv = f->C_SetOperationState(session , pin, strlen(pin),
+ CK_INVALID_HANDLE, CK_INVALID_HANDLE)) != CKR_OK) {
+ debug_f("could not supply SO pin: %lu", rv);
+ reset_pin = 0;
+ } else
+ reset_pin = 1;
+
+ /* private key */
+ nattrs = 0;
+ key_class = CKO_PRIVATE_KEY;
+ FILL_ATTR(attrs, nattrs, CKA_CLASS, &key_class, sizeof(key_class));
+ FILL_ATTR(attrs, nattrs, CKA_ID, &keyid, sizeof(keyid));
+
+ if (pkcs11_find(p, slotidx, attrs, nattrs, &obj) == 0 &&
+ obj != CK_INVALID_HANDLE) {
+ if ((rv = f->C_DestroyObject(session, obj)) != CKR_OK) {
+ debug_f("could not destroy private key 0x%hhx",
+ keyid);
+ *err = rv;
+ goto out;
+ }
+ }
+
+ /* public key */
+ nattrs = 0;
+ key_class = CKO_PUBLIC_KEY;
+ FILL_ATTR(attrs, nattrs, CKA_CLASS, &key_class, sizeof(key_class));
+ FILL_ATTR(attrs, nattrs, CKA_ID, &keyid, sizeof(keyid));
+
+ if (pkcs11_find(p, slotidx, attrs, nattrs, &obj) == 0 &&
+ obj != CK_INVALID_HANDLE) {
+
+ /* get key type */
+ nattrs = 0;
+ FILL_ATTR(attrs, nattrs, CKA_KEY_TYPE, &key_type,
+ sizeof(key_type));
+ rv = f->C_GetAttributeValue(session, obj, attrs, nattrs);
+ if (rv != CKR_OK) {
+ debug_f("could not get key type of public key 0x%hhx",
+ keyid);
+ *err = rv;
+ key_type = -1;
+ }
+ if (key_type == CKK_RSA)
+ k = pkcs11_fetch_rsa_pubkey(p, slotidx, &obj);
+ else if (key_type == CKK_ECDSA)
+ k = pkcs11_fetch_ecdsa_pubkey(p, slotidx, &obj);
+
+ if ((rv = f->C_DestroyObject(session, obj)) != CKR_OK) {
+ debug_f("could not destroy public key 0x%hhx", keyid);
+ *err = rv;
+ goto out;
+ }
+ }
+
+out:
+ if (reset_pin)
+ f->C_SetOperationState(session , NULL, 0, CK_INVALID_HANDLE,
+ CK_INVALID_HANDLE);
+
+ if (reset_provider)
+ pkcs11_del_provider(provider_id);
+
+ return (k);
+}
+#endif /* WITH_PKCS11_KEYGEN */
+#else /* ENABLE_PKCS11 */
+
+#include <sys/types.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include "log.h"
+#include "sshkey.h"
+
+int
+pkcs11_init(int interactive)
+{
+ error("%s: dlopen() not supported", __func__);
+ return (-1);
+}
+
+int
+pkcs11_add_provider(char *provider_id, char *pin, struct sshkey ***keyp,
+ char ***labelsp)
+{
+ error("%s: dlopen() not supported", __func__);
+ return (-1);
+}
+
+void
+pkcs11_terminate(void)
+{
+ error("%s: dlopen() not supported", __func__);
+}
+#endif /* ENABLE_PKCS11 */