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openssh/openssh-7.6p1-pkcs11-ecdsa.patch

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PKCS#11: Support ECDSA keys and PKCS#11 URIs Based on the patches in upstream bugzilla: ECDSA: https://bugzilla.mindrot.org/show_bug.cgi?id=2474 PKCS#11 URI: https://bugzilla.mindrot.org/show_bug.cgi?id=2817
2018-02-16 14:46:38 +00:00
diff -up openssh-7.6p1/ssh-pkcs11-client.c.pkcs11-ecdsa openssh-7.6p1/ssh-pkcs11-client.c
--- openssh-7.6p1/ssh-pkcs11-client.c.pkcs11-ecdsa 2018-02-16 13:25:59.426469253 +0100
+++ openssh-7.6p1/ssh-pkcs11-client.c 2018-02-16 13:25:59.428469265 +0100
@@ -31,6 +31,15 @@
#include <errno.h>
#include <openssl/rsa.h>
+#ifdef OPENSSL_HAS_ECC
+#include <openssl/ecdsa.h>
+#if ((defined(LIBRESSL_VERSION_NUMBER) && \
+ (LIBRESSL_VERSION_NUMBER >= 0x20010002L))) || \
+ (defined(ECDSA_F_ECDSA_METHOD_NEW)) || \
+ (OPENSSL_VERSION_NUMBER >= 0x00010100L)
+#define ENABLE_PKCS11_ECDSA 1
+#endif
+#endif
#include "pathnames.h"
#include "xmalloc.h"
@@ -139,9 +147,9 @@ pkcs11_rsa_private_encrypt(int flen, con
return (ret);
}
-/* redirect the private key encrypt operation to the ssh-pkcs11-helper */
+/* redirect the RSA private key encrypt operation to the ssh-pkcs11-helper */
static int
-wrap_key(RSA *rsa)
+wrap_rsa_key(RSA *rsa)
{
static RSA_METHOD helper_rsa;
@@ -152,6 +160,81 @@ wrap_key(RSA *rsa)
return (0);
}
+#ifdef ENABLE_PKCS11_ECDSA
+static ECDSA_SIG *
+pkcs11_ecdsa_private_sign(const unsigned char *from, int flen,
+ const BIGNUM *inv, const BIGNUM *rp, EC_KEY * ecdsa)
+{
+ Key key;
+ u_char *blob, *signature = NULL;
+ u_int blen, slen = 0;
+ Buffer msg;
+ ECDSA_SIG *ret = NULL;
+ BIGNUM *r = NULL, *s = NULL;
+
+ key.type = KEY_ECDSA;
+ key.ecdsa = ecdsa;
+ key.ecdsa_nid = sshkey_ecdsa_key_to_nid(ecdsa);
+ if (key_to_blob(&key, &blob, &blen) == 0)
+ return NULL;
+ buffer_init(&msg);
+ buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST);
+ buffer_put_string(&msg, blob, blen);
+ buffer_put_string(&msg, from, flen);
+ buffer_put_int(&msg, 0);
+ free(blob);
+ send_msg(&msg);
+ buffer_clear(&msg);
+
+ if (recv_msg(&msg) == SSH2_AGENT_SIGN_RESPONSE) {
+ signature = buffer_get_string(&msg, &slen);
+ if (slen <= (u_int)ECDSA_size(ecdsa)) {
+ int nlen = slen / 2;
+ ret = ECDSA_SIG_new();
+ r = BN_new();
+ s = BN_new();
+ BN_bin2bn(&signature[0], nlen, r);
+ BN_bin2bn(&signature[nlen], nlen, s);
+ ECDSA_SIG_set0(ret, r, s);
+ }
+ free(signature);
+ }
+ buffer_free(&msg);
+ return (ret);
+}
+
+/* redirect the ECDSA private key encrypt operation to the ssh-pkcs11-helper */
+static int
+wrap_ecdsa_key(EC_KEY *ecdsa) {
+#if (OPENSSL_VERSION_NUMBER >= 0x00010100L)
+ static EC_KEY_METHOD *helper_ecdsa = NULL;
+ if (helper_ecdsa == NULL) {
+ const EC_KEY_METHOD *def = EC_KEY_get_default_method();
+ helper_ecdsa = EC_KEY_METHOD_new(def);
+ EC_KEY_METHOD_set_sign(helper_ecdsa, NULL, NULL, pkcs11_ecdsa_private_sign);
+ }
+ EC_KEY_set_method(ecdsa, helper_ecdsa);
+#else
+ static ECDSA_METHOD *helper_ecdsa = NULL;
+ if(helper_ecdsa == NULL) {
+ const ECDSA_METHOD *def = ECDSA_get_default_method();
+# ifdef ECDSA_F_ECDSA_METHOD_NEW
+ helper_ecdsa = ECDSA_METHOD_new((ECDSA_METHOD *)def);
+ ECDSA_METHOD_set_name(helper_ecdsa, "ssh-pkcs11-helper-ecdsa");
+ ECDSA_METHOD_set_sign(helper_ecdsa, pkcs11_ecdsa_private_sign);
+# else
+ helper_ecdsa = xcalloc(1, sizeof(*helper_ecdsa));
+ memcpy(helper_ecdsa, def, sizeof(*helper_ecdsa));
+ helper_ecdsa->name = "ssh-pkcs11-helper-ecdsa";
+ helper_ecdsa->ecdsa_do_sign = pkcs11_ecdsa_private_sign;
+# endif
+ }
+ ECDSA_set_method(ecdsa, helper_ecdsa);
+#endif
+ return (0);
+}
+#endif
+
static int
pkcs11_start_helper(void)
{
@@ -212,7 +281,15 @@ pkcs11_add_provider(char *name, char *pi
blob = buffer_get_string(&msg, &blen);
free(buffer_get_string(&msg, NULL));
k = key_from_blob(blob, blen);
- wrap_key(k->rsa);
+ if(k->type == KEY_RSA) {
+ wrap_rsa_key(k->rsa);
+#ifdef ENABLE_PKCS11_ECDSA
+ } else if(k->type == KEY_ECDSA) {
+ wrap_ecdsa_key(k->ecdsa);
+#endif /* ENABLE_PKCS11_ECDSA */
+ } else {
+ /* Unsupported type */
+ }
(*keysp)[i] = k;
free(blob);
}
diff -up openssh-7.6p1/ssh-pkcs11.c.pkcs11-ecdsa openssh-7.6p1/ssh-pkcs11.c
--- openssh-7.6p1/ssh-pkcs11.c.pkcs11-ecdsa 2018-02-16 13:25:59.427469259 +0100
+++ openssh-7.6p1/ssh-pkcs11.c 2018-02-16 13:44:51.270554797 +0100
@@ -32,6 +32,16 @@
#include "openbsd-compat/sys-queue.h"
#include <openssl/x509.h>
+#include <openssl/rsa.h>
+#ifdef OPENSSL_HAS_ECC
+#include <openssl/ecdsa.h>
+#if ((defined(LIBRESSL_VERSION_NUMBER) && \
+ (LIBRESSL_VERSION_NUMBER >= 0x20010002L))) || \
+ (defined(ECDSA_F_ECDSA_METHOD_NEW)) || \
+ (OPENSSL_VERSION_NUMBER >= 0x00010100L)
+#define ENABLE_PKCS11_ECDSA 1
+#endif
+#endif
#define CRYPTOKI_COMPAT
#include "pkcs11.h"
@@ -67,6 +76,7 @@ TAILQ_HEAD(, pkcs11_provider) pkcs11_pro
struct pkcs11_key {
struct pkcs11_provider *provider;
CK_ULONG slotidx;
+ CK_ULONG key_type;
int (*orig_finish)(RSA *rsa);
RSA_METHOD rsa_method;
char *label;
@@ -75,6 +85,9 @@ struct pkcs11_key {
};
int pkcs11_interactive = 0;
+#ifdef ENABLE_PKCS11_ECDSA
+static int pkcs11_key_idx = -1;
+#endif /* ENABLE_PKCS11_ECDSA */
/*
* This can't be in the ssh-pkcs11-uri, becase we can not depend on
@@ -289,6 +302,40 @@ pkcs11_find(struct pkcs11_provider *p, C
return (ret);
}
+int pkcs11_login(struct pkcs11_key *k11, CK_FUNCTION_LIST *f, struct pkcs11_slotinfo *si) {
+ char *pin = NULL, prompt[1024];
+ CK_RV rv;
+ if ((si->token.flags & CKF_LOGIN_REQUIRED) && !si->logged_in) {
+ 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);
+ pin = read_passphrase(prompt, RP_ALLOW_EOF);
+ if (pin == NULL)
+ return (-1); /* bail out */
+ }
+ rv = f->C_Login(si->session, CKU_USER, (u_char *)pin,
+ (pin != NULL) ? strlen(pin) : 0);
+ if (pin != NULL) {
+ explicit_bzero(pin, strlen(pin));
+ free(pin);
+ }
+ if (rv != CKR_OK && rv != CKR_USER_ALREADY_LOGGED_IN) {
+ error("C_Login failed: %lu", rv);
+ return (-1);
+ }
+ si->logged_in = 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,
@@ -310,7 +357,6 @@ pkcs11_rsa_private_encrypt(int flen, con
{CKA_ID, NULL, 0},
{CKA_SIGN, NULL, sizeof(true_val) }
};
- char *pin = NULL, prompt[1024];
int rval = -1;
key_filter[0].pValue = &private_key_class;
@@ -326,33 +372,8 @@ pkcs11_rsa_private_encrypt(int flen, con
}
f = k11->provider->function_list;
si = &k11->provider->slotinfo[k11->slotidx];
- if ((si->token.flags & CKF_LOGIN_REQUIRED) && !si->logged_in) {
- 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);
- pin = read_passphrase(prompt, RP_ALLOW_EOF);
- if (pin == NULL)
- return (-1); /* bail out */
- }
- rv = f->C_Login(si->session, CKU_USER, (u_char *)pin,
- (pin != NULL) ? strlen(pin) : 0);
- if (pin != NULL) {
- explicit_bzero(pin, strlen(pin));
- free(pin);
- }
- if (rv != CKR_OK && rv != CKR_USER_ALREADY_LOGGED_IN) {
- error("C_Login failed: %lu", rv);
- return (-1);
- }
- si->logged_in = 1;
+ if(pkcs11_login(k11, f, si)) {
+ return (-1);
}
key_filter[1].pValue = k11->keyid;
key_filter[1].ulValueLen = k11->keyid_len;
@@ -390,6 +411,7 @@ pkcs11_rsa_wrap(struct pkcs11_provider *
const RSA_METHOD *def = RSA_get_default_method();
k11 = xcalloc(1, sizeof(*k11));
+ k11->key_type = CKK_RSA;
k11->provider = provider;
provider->refcount++; /* provider referenced by RSA key */
k11->slotidx = slotidx;
@@ -415,6 +437,184 @@ pkcs11_rsa_wrap(struct pkcs11_provider *
return (0);
}
+#ifdef ENABLE_PKCS11_ECDSA
+static ECDSA_SIG *pkcs11_ecdsa_sign(const unsigned char *dgst, int dgst_len,
+ const BIGNUM *inv, const BIGNUM *rp,
+ EC_KEY *ecdsa) {
+ struct pkcs11_key *k11;
+ struct pkcs11_slotinfo *si;
+ CK_FUNCTION_LIST *f;
+ CK_OBJECT_HANDLE obj;
+ CK_ULONG tlen = 0;
+ CK_RV rv;
+ CK_OBJECT_CLASS private_key_class = CKO_PRIVATE_KEY;
+ CK_BBOOL true_val = CK_TRUE;
+ CK_MECHANISM mech = {
+ CKM_ECDSA, NULL_PTR, 0
+ };
+ CK_ATTRIBUTE key_filter[] = {
+ {CKA_CLASS, NULL, sizeof(private_key_class) },
+ {CKA_ID, NULL, 0},
+ {CKA_SIGN, NULL, sizeof(true_val) }
+ };
+ ECDSA_SIG *rval = NULL;
+ key_filter[0].pValue = &private_key_class;
+ key_filter[2].pValue = &true_val;
+
+ #if (OPENSSL_VERSION_NUMBER >= 0x00010100L)
+ if ((k11 = (struct pkcs11_key *)EC_KEY_get_ex_data(ecdsa, pkcs11_key_idx)) == NULL) {
+ error("EC_KEY_get_ex_data failed for ecdsa %p", ecdsa);
+ #else
+ if ((k11 = (struct pkcs11_key *)ECDSA_get_ex_data(ecdsa, pkcs11_key_idx)) == NULL) {
+ error("ECDSA_get_ex_data failed for ecdsa %p", ecdsa);
+ #endif
+ return NULL;
+ }
+ if (!k11->provider || !k11->provider->valid) {
+ error("no pkcs11 (valid) provider for ecdsa %p", ecdsa);
+ return NULL;
+ }
+ f = k11->provider->function_list;
+ si = &k11->provider->slotinfo[k11->slotidx];
+ if(pkcs11_login(k11, f, si)) {
+ return NULL;
+ }
+ key_filter[1].pValue = k11->keyid;
+ key_filter[1].ulValueLen = k11->keyid_len;
+ /* 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");
+ } else if ((rv = f->C_SignInit(si->session, &mech, obj)) != CKR_OK) {
+ error("C_SignInit failed: %lu", rv);
+ } else {
+ CK_BYTE_PTR buf = NULL;
+ BIGNUM *r = NULL, *s = NULL;
+ int nlen;
+ /* Make a call to C_Sign to find out the size of the signature */
+ rv = f->C_Sign(si->session, (CK_BYTE *)dgst, dgst_len, NULL, &tlen);
+ if (rv != CKR_OK) {
+ error("C_Sign failed: %lu", rv);
+ return NULL;
+ }
+ if ((buf = xmalloc(tlen)) == NULL) {
+ error("failure to allocate signature buffer");
+ return NULL;
+ }
+ rv = f->C_Sign(si->session, (CK_BYTE *)dgst, dgst_len, buf, &tlen);
+ if (rv != CKR_OK) {
+ error("C_Sign failed: %lu", rv);
+ }
+
+ if ((rval = ECDSA_SIG_new()) == NULL ||
+ (r = BN_new()) == NULL ||
+ (s = BN_new()) == NULL) {
+ error("failure to allocate ECDSA signature");
+ } else {
+ /*
+ * ECDSA signature is 2 large integers of same size returned
+ * concatenated by PKCS#11, we separate them to create an
+ * ECDSA_SIG for OpenSSL.
+ */
+ nlen = tlen / 2;
+ BN_bin2bn(&buf[0], nlen, r);
+ BN_bin2bn(&buf[nlen], nlen, s);
+ ECDSA_SIG_set0(rval, r, s);
+ }
+ free(buf);
+ }
+ return (rval);
+}
+
+#if (OPENSSL_VERSION_NUMBER >= 0x00010100L)
+static EC_KEY_METHOD *get_pkcs11_ecdsa_method(void) {
+ static EC_KEY_METHOD *pkcs11_ecdsa_method = NULL;
+ if(pkcs11_key_idx == -1) {
+ pkcs11_key_idx = EC_KEY_get_ex_new_index(0, NULL, NULL, NULL, 0);
+ }
+ if (pkcs11_ecdsa_method == NULL) {
+ const EC_KEY_METHOD *def = EC_KEY_get_default_method();
+ pkcs11_ecdsa_method = EC_KEY_METHOD_new(def);
+ EC_KEY_METHOD_set_sign(pkcs11_ecdsa_method, NULL, NULL, pkcs11_ecdsa_sign);
+ }
+#else
+static ECDSA_METHOD *get_pkcs11_ecdsa_method(void) {
+ static ECDSA_METHOD *pkcs11_ecdsa_method = NULL;
+ if(pkcs11_key_idx == -1) {
+ pkcs11_key_idx = ECDSA_get_ex_new_index(0, NULL, NULL, NULL, 0);
+ }
+ if(pkcs11_ecdsa_method == NULL) {
+ const ECDSA_METHOD *def = ECDSA_get_default_method();
+ #ifdef ECDSA_F_ECDSA_METHOD_NEW
+ pkcs11_ecdsa_method = ECDSA_METHOD_new((ECDSA_METHOD *)def);
+ ECDSA_METHOD_set_name(pkcs11_ecdsa_method, "pkcs11");
+ ECDSA_METHOD_set_sign(pkcs11_ecdsa_method, pkcs11_ecdsa_sign);
+ #else
+ pkcs11_ecdsa_method = xcalloc(1, sizeof(*pkcs11_ecdsa_method));
+ memcpy(pkcs11_ecdsa_method, def, sizeof(*pkcs11_ecdsa_method));
+ pkcs11_ecdsa_method->name = "pkcs11";
+ pkcs11_ecdsa_method->ecdsa_do_sign = pkcs11_ecdsa_sign;
+ #endif
+ }
+#endif
+ return pkcs11_ecdsa_method;
+}
+
+static int
+pkcs11_ecdsa_wrap(struct pkcs11_provider *provider, CK_ULONG slotidx,
+ CK_ATTRIBUTE *keyid_attrib, CK_ATTRIBUTE *label_attrib, EC_KEY *ecdsa)
+{
+ struct pkcs11_key *k11;
+ k11 = xcalloc(1, sizeof(*k11));
+ k11->key_type = CKK_EC;
+ 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);
+ }
+ if (label_attrib->ulValueLen > 0 ) {
+ k11->label = xmalloc(label_attrib->ulValueLen+1);
+ memcpy(k11->label, label_attrib->pValue, label_attrib->ulValueLen);
+ k11->label[label_attrib->ulValueLen] = 0;
+ }
+ #if (OPENSSL_VERSION_NUMBER >= 0x00010100L)
+ EC_KEY_set_method(ecdsa, get_pkcs11_ecdsa_method());
+ EC_KEY_set_ex_data(ecdsa, pkcs11_key_idx, k11);
+ #else
+ ECDSA_set_method(ecdsa, get_pkcs11_ecdsa_method());
+ ECDSA_set_ex_data(ecdsa, pkcs11_key_idx, k11);
+ #endif
+ return (0);
+}
+#endif /* ENABLE_PKCS11_ECDSA */
+
+int pkcs11_del_key(struct sshkey *key) {
+#ifdef ENABLE_PKCS11_ECDSA
+ if(key->type == KEY_ECDSA) {
+ struct pkcs11_key *k11 = (struct pkcs11_key *)
+ #if (OPENSSL_VERSION_NUMBER >= 0x00010100L)
+ EC_KEY_get_ex_data(key->ecdsa, pkcs11_key_idx);
+ #else
+ ECDSA_get_ex_data(key->ecdsa, pkcs11_key_idx);
+ #endif
+ if (k11 == NULL) {
+ error("EC_KEY_get_ex_data failed for ecdsa %p", key->ecdsa);
+ } else {
+ if (k11->provider)
+ pkcs11_provider_unref(k11->provider);
+ free(k11->keyid);
+ free(k11);
+ }
+ }
+#endif /* ENABLE_PKCS11_ECDSA */
+ sshkey_free(key);
+ return (0);
+}
+
/* remove trailing spaces */
static void
rmspace(u_char *buf, size_t len)
@@ -482,11 +646,13 @@ static int
pkcs11_fetch_keys(struct pkcs11_provider *p, CK_ULONG slotidx,
struct sshkey ***keysp, int *nkeys, struct pkcs11_uri *uri)
{
- size_t filter_size = 1;
+ size_t filter_size = 2;
+ CK_KEY_TYPE pubkey_type = CKK_RSA;
CK_OBJECT_CLASS pubkey_class = CKO_PUBLIC_KEY;
CK_OBJECT_CLASS cert_class = CKO_CERTIFICATE;
CK_ATTRIBUTE pubkey_filter[] = {
{ CKA_CLASS, NULL, sizeof(pubkey_class) },
+ { CKA_KEY_TYPE, NULL, sizeof(pubkey_type) },
{ CKA_ID, NULL, 0 },
{ CKA_LABEL, NULL, 0 }
};
@@ -507,29 +673,60 @@ pkcs11_fetch_keys(struct pkcs11_provider
{ CKA_SUBJECT, NULL, 0 },
{ CKA_VALUE, NULL, 0 }
};
+#ifdef ENABLE_PKCS11_ECDSA
+ CK_KEY_TYPE ecdsa_type = CKK_EC;
+ CK_ATTRIBUTE ecdsa_filter[] = {
+ { CKA_CLASS, NULL, sizeof(pubkey_class) },
+ { CKA_KEY_TYPE, NULL, sizeof(ecdsa_type) },
+ { CKA_ID, NULL, 0 },
+ { CKA_LABEL, NULL, 0 }
+ };
+ CK_ATTRIBUTE ecdsa_attribs[] = {
+ { CKA_ID, NULL, 0 },
+ { CKA_LABEL, NULL, 0 },
+ { CKA_EC_PARAMS, NULL, 0 },
+ { CKA_EC_POINT, NULL, 0 }
+ };
+ ecdsa_filter[0].pValue = &pubkey_class;
+ ecdsa_filter[1].pValue = &ecdsa_type;
+#endif /* ENABLE_PKCS11_ECDSA */
pubkey_filter[0].pValue = &pubkey_class;
+ pubkey_filter[1].pValue = &pubkey_type;
cert_filter[0].pValue = &cert_class;
if (uri->id != NULL) {
pubkey_filter[filter_size].pValue = uri->id;
pubkey_filter[filter_size].ulValueLen = uri->id_len;
- cert_filter[filter_size].pValue = uri->id;
- cert_filter[filter_size].ulValueLen = uri->id_len;
+#ifdef ENABLE_PKCS11_ECDSA
+ ecdsa_filter[filter_size].pValue = uri->id;
+ ecdsa_filter[filter_size].ulValueLen = uri->id_len;
+#endif /* ENABLE_PKCS11_ECDSA */
+ cert_filter[filter_size-1].pValue = uri->id;
+ cert_filter[filter_size-1].ulValueLen = uri->id_len;
filter_size++;
}
if (uri->object != NULL) {
pubkey_filter[filter_size].pValue = uri->object;
pubkey_filter[filter_size].ulValueLen = strlen(uri->object);
pubkey_filter[filter_size].type = CKA_LABEL;
- cert_filter[filter_size].pValue = uri->object;
- cert_filter[filter_size].ulValueLen = strlen(uri->object);
- cert_filter[filter_size].type = CKA_LABEL;
+#ifdef ENABLE_PKCS11_ECDSA
+ ecdsa_filter[filter_size].pValue = uri->object;
+ ecdsa_filter[filter_size].ulValueLen = strlen(uri->object);
+ ecdsa_filter[filter_size].type = CKA_LABEL;
+#endif /* ENABLE_PKCS11_ECDSA */
+ cert_filter[filter_size-1].pValue = uri->object;
+ cert_filter[filter_size-1].ulValueLen = strlen(uri->object);
+ cert_filter[filter_size-1].type = CKA_LABEL;
filter_size++;
}
if (pkcs11_fetch_keys_filter(p, slotidx, pubkey_filter, filter_size,
pubkey_attribs, keysp, nkeys) < 0 ||
- pkcs11_fetch_keys_filter(p, slotidx, cert_filter, filter_size,
+#ifdef ENABLE_PKCS11_ECDSA
+ pkcs11_fetch_keys_filter(p, slotidx, ecdsa_filter, filter_size,
+ ecdsa_attribs, keysp, nkeys) < 0||
+#endif /* ENABLE_PKCS11_ECDSA */
+ pkcs11_fetch_keys_filter(p, slotidx, cert_filter, filter_size - 1,
cert_attribs, keysp, nkeys) < 0)
return (-1);
return (0);
@@ -553,6 +746,11 @@ pkcs11_fetch_keys_filter(struct pkcs11_p
{
struct sshkey *key;
RSA *rsa;
+#ifdef ENABLE_PKCS11_ECDSA
+ EC_KEY *ecdsa;
+#else
+ void *ecdsa;
+#endif /* ENABLE_PKCS11_ECDSA */
X509 *x509;
EVP_PKEY *evp = NULL;
int i;
@@ -608,6 +806,9 @@ pkcs11_fetch_keys_filter(struct pkcs11_p
* or ID, label, subject and value for certificates.
*/
rsa = NULL;
+#ifdef ENABLE_PKCS11_ECDSA
+ ecdsa = NULL;
+#endif /* ENABLE_PKCS11_ECDSA */
if ((rv = f->C_GetAttributeValue(session, obj, attribs, nattribs))
!= CKR_OK) {
error("C_GetAttributeValue failed: %lu", rv);
@@ -620,6 +821,45 @@ pkcs11_fetch_keys_filter(struct pkcs11_p
rsa->e = BN_bin2bn(attribs[3].pValue,
attribs[3].ulValueLen, NULL);
}
+#ifdef ENABLE_PKCS11_ECDSA
+ } else if (attribs[2].type == CKA_EC_PARAMS ) {
+ if ((ecdsa = EC_KEY_new()) == NULL) {
+ error("EC_KEY_new failed");
+ } else {
+ const unsigned char *ptr1 = attribs[2].pValue;
+ const unsigned char *ptr2 = attribs[3].pValue;
+ CK_ULONG len1 = attribs[2].ulValueLen;
+ CK_ULONG len2 = attribs[3].ulValueLen;
+ ASN1_OCTET_STRING *point = NULL;
+
+ /*
+ * CKA_EC_PARAMS contains the curve parameters of the key
+ * either referenced as an OID or directly with all values.
+ * CKA_EC_POINT contains the point (public key) on the curve.
+ * The point is should be returned inside a DER-encoded
+ * ASN.1 OCTET STRING value (but some implementation).
+ */
+ if ((point = d2i_ASN1_OCTET_STRING(NULL, &ptr2, len2))) {
+ /* Pointing to OCTET STRING content */
+ ptr2 = point->data;
+ len2 = point->length;
+ } else {
+ /* No OCTET STRING */
+ ptr2 = attribs[3].pValue;
+ }
+
+ if((d2i_ECParameters(&ecdsa, &ptr1, len1) == NULL) ||
+ (o2i_ECPublicKey(&ecdsa, &ptr2, len2) == NULL)) {
+ EC_KEY_free(ecdsa);
+ ecdsa = NULL;
+ error("EC public key parsing failed");
+ }
+
+ if(point) {
+ ASN1_OCTET_STRING_free(point);
+ }
+ }
+#endif /* ENABLE_PKCS11_ECDSA */
} else {
cp = attribs[3].pValue;
if ((x509 = X509_new()) == NULL) {
@@ -639,13 +879,28 @@ pkcs11_fetch_keys_filter(struct pkcs11_p
X509_free(x509);
EVP_PKEY_free(evp);
}
- if (rsa && rsa->n && rsa->e &&
- pkcs11_rsa_wrap(p, slotidx, &attribs[0], &attribs[1], rsa) == 0) {
- if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
- fatal("sshkey_new failed");
- key->rsa = rsa;
- key->type = KEY_RSA;
- key->flags |= SSHKEY_FLAG_EXT;
+ key = NULL;
+ if (rsa || ecdsa) {
+ if (rsa && rsa->n && rsa->e &&
+ pkcs11_rsa_wrap(p, slotidx, &attribs[0], &attribs[1], rsa) == 0) {
+ if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
+ fatal("sshkey_new failed");
+ key->rsa = rsa;
+ key->type = KEY_RSA;
+ key->flags |= SSHKEY_FLAG_EXT;
+#ifdef ENABLE_PKCS11_ECDSA
+ } else if(ecdsa && pkcs11_ecdsa_wrap(p, slotidx, &attribs[0], &attribs[1], ecdsa) == 0) {
+ if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
+ fatal("sshkey_new failed");
+ key->ecdsa = ecdsa;
+ key->ecdsa_nid = sshkey_ecdsa_key_to_nid(ecdsa);
+ key->type = KEY_ECDSA;
+ key->flags |= SSHKEY_FLAG_EXT;
+#endif /* ENABLE_PKCS11_ECDSA */
+ }
+ }
+
+ if(key) {
if (pkcs11_key_included(keysp, nkeys, key)) {
sshkey_free(key);
} else {
@@ -658,6 +913,10 @@ pkcs11_fetch_keys_filter(struct pkcs11_p
}
} else if (rsa) {
RSA_free(rsa);
+#ifdef ENABLE_PKCS11_ECDSA
+ } else if (ecdsa) {
+ EC_KEY_free(ecdsa);
+#endif /* ENABLE_PKCS11_ECDSA */
}
for (i = 0; i < nattribs; i++)
free(attribs[i].pValue);
diff -up openssh-7.6p1/ssh-pkcs11-helper.c.pkcs11-ecdsa openssh-7.6p1/ssh-pkcs11-helper.c
--- openssh-7.6p1/ssh-pkcs11-helper.c.pkcs11-ecdsa 2017-10-02 21:34:26.000000000 +0200
+++ openssh-7.6p1/ssh-pkcs11-helper.c 2018-02-16 13:25:59.428469265 +0100
@@ -24,6 +24,17 @@
#include "openbsd-compat/sys-queue.h"
+#include <openssl/rsa.h>
+#ifdef OPENSSL_HAS_ECC
+#include <openssl/ecdsa.h>
+#if ((defined(LIBRESSL_VERSION_NUMBER) && \
+ (LIBRESSL_VERSION_NUMBER >= 0x20010002L))) || \
+ (defined(ECDSA_F_ECDSA_METHOD_NEW)) || \
+ (OPENSSL_VERSION_NUMBER >= 0x00010100L)
+#define ENABLE_PKCS11_ECDSA 1
+#endif
+#endif
+
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
@@ -80,7 +90,7 @@ del_keys_by_name(char *name)
if (!strcmp(ki->providername, name)) {
TAILQ_REMOVE(&pkcs11_keylist, ki, next);
free(ki->providername);
- key_free(ki->key);
+ pkcs11_del_key(ki->key);
free(ki);
}
}
@@ -164,6 +174,20 @@ process_del(void)
buffer_free(&msg);
}
+#ifdef ENABLE_PKCS11_ECDSA
+static u_int EC_KEY_order_size(EC_KEY *key)
+{
+ const EC_GROUP *group = EC_KEY_get0_group(key);
+ BIGNUM *order = BN_new();
+ u_int nbytes = 0;
+ if ((group != NULL) && (order != NULL) && EC_GROUP_get_order(group, order, NULL)) {
+ nbytes = BN_num_bytes(order);
+ }
+ BN_clear_free(order);
+ return nbytes;
+}
+#endif /* ENABLE_PKCS11_ECDSA */
+
static void
process_sign(void)
{
@@ -180,14 +204,38 @@ process_sign(void)
if ((key = key_from_blob(blob, blen)) != NULL) {
if ((found = lookup_key(key)) != NULL) {
#ifdef WITH_OPENSSL
- int ret;
-
- slen = RSA_size(key->rsa);
- signature = xmalloc(slen);
- if ((ret = RSA_private_encrypt(dlen, data, signature,
- found->rsa, RSA_PKCS1_PADDING)) != -1) {
- slen = ret;
- ok = 0;
+ if(found->type == KEY_RSA) {
+ int ret;
+ slen = RSA_size(key->rsa);
+ signature = xmalloc(slen);
+ if ((ret = RSA_private_encrypt(dlen, data, signature,
+ found->rsa, RSA_PKCS1_PADDING)) != -1) {
+ slen = ret;
+ ok = 0;
+ }
+#ifdef ENABLE_PKCS11_ECDSA
+ } else if(found->type == KEY_ECDSA) {
+ ECDSA_SIG *sig;
+ const BIGNUM *r = NULL, *s = NULL;
+ if ((sig = ECDSA_do_sign(data, dlen, found->ecdsa)) != NULL) {
+ /* PKCS11 2.3.1 recommends both r and s to have the order size for
+ backward compatiblity */
+ ECDSA_SIG_get0(sig, &r, &s);
+ u_int o_len = EC_KEY_order_size(found->ecdsa);
+ u_int r_len = BN_num_bytes(r);
+ u_int s_len = BN_num_bytes(s);
+ if (o_len > 0 && r_len <= o_len && s_len <= o_len) {
+ signature = xcalloc(2, o_len);
+ BN_bn2bin(r, signature + o_len - r_len);
+ BN_bn2bin(s, signature + (2 * o_len) - s_len);
+ slen = 2 * o_len;
+ ok = 0;
+ }
+ ECDSA_SIG_free(sig);
+ }
+#endif /* ENABLE_PKCS11_ECDSA */
+ } else {
+ /* Unsupported type */
}
#endif /* WITH_OPENSSL */
}
diff -up openssh-7.6p1/ssh-pkcs11.h.pkcs11-ecdsa openssh-7.6p1/ssh-pkcs11.h
--- openssh-7.6p1/ssh-pkcs11.h.pkcs11-ecdsa 2018-02-16 13:25:59.429469272 +0100
+++ openssh-7.6p1/ssh-pkcs11.h 2018-02-16 13:45:29.623800048 +0100
@@ -20,6 +20,7 @@
int pkcs11_init(int);
void pkcs11_terminate(void);
int pkcs11_add_provider(char *, char *, struct sshkey ***);
+int pkcs11_del_key(struct sshkey *);
int pkcs11_add_provider_by_uri(struct pkcs11_uri *, char *, struct sshkey ***);
int pkcs11_del_provider(char *);
int pkcs11_uri_write(const struct sshkey *, FILE *);
PKCS#11: Load public keys from ECDSA certificates Submitted in upstream bugzilla https://bugzilla.mindrot.org/show_bug.cgi?id=2474#c21
2018-02-16 16:26:53 +00:00
diff -up openssh-7.6p1/ssh-pkcs11.c.old openssh-7.6p1/ssh-pkcs11.c
--- openssh-7.6p1/ssh-pkcs11.c.old 2018-02-16 16:43:08.861520255 +0100
+++ openssh-7.6p1/ssh-pkcs11.c 2018-02-16 16:56:35.312601451 +0100
@@ -917,13 +917,28 @@ pkcs11_fetch_keys_filter(struct pkcs11_p
} else if (d2i_X509(&x509, &cp, attribs[3].ulValueLen)
== NULL) {
error("d2i_X509 failed");
- } else if ((evp = X509_get_pubkey(x509)) == NULL ||
- evp->type != EVP_PKEY_RSA ||
- evp->pkey.rsa == NULL) {
- debug("X509_get_pubkey failed or no rsa");
- } else if ((rsa = RSAPublicKey_dup(evp->pkey.rsa))
- == NULL) {
- error("RSAPublicKey_dup");
+ } else if ((evp = X509_get_pubkey(x509)) == NULL) {
+ debug("X509_get_pubkey failed");
+ } else {
+ switch (evp->type) {
+ case EVP_PKEY_RSA:
+ if (evp->pkey.rsa == NULL)
+ debug("Missing RSA key");
+ else if ((rsa = RSAPublicKey_dup(
+ evp->pkey.rsa)) == NULL)
+ error("RSAPublicKey_dup failed");
+ break;
+ case EVP_PKEY_EC:
+ if (evp->pkey.ecdsa == NULL)
+ debug("Missing ECDSA key");
+ else if ((ecdsa = EC_KEY_dup(
+ evp->pkey.ecdsa)) == NULL)
+ error("EC_KEY_dup failed");
+ break;
+ default:
+ debug("not a RSA or ECDSA key");
+ break;
+ }
}
if (x509)
X509_free(x509);
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