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https://gitlab.freedesktop.org/NetworkManager/NetworkManager
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![Thomas Haller](/assets/img/avatar_default.png)
- All internal source files (except "examples", which are not internal) should include "config.h" first. As also all internal source files should include "nm-default.h", let "config.h" be included by "nm-default.h" and include "nm-default.h" as first in every source file. We already wanted to include "nm-default.h" before other headers because it might contains some fixes (like "nm-glib.h" compatibility) that is required first. - After including "nm-default.h", we optinally allow for including the corresponding header file for the source file at hand. The idea is to ensure that each header file is self contained. - Don't include "config.h" or "nm-default.h" in any header file (except "nm-sd-adapt.h"). Public headers anyway must not include these headers, and internal headers are never included after "nm-default.h", as of the first previous point. - Include all internal headers with quotes instead of angle brackets. In practice it doesn't matter, because in our public headers we must include other headers with angle brackets. As we use our public headers also to compile our interal source files, effectively the result must be the same. Still do it for consistency. - Except for <config.h> itself. Include it with angle brackets as suggested by https://www.gnu.org/software/autoconf/manual/autoconf.html#Configuration-Headers
524 lines
14 KiB
C
524 lines
14 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
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/*
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* Dan Williams <dcbw@redhat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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* Copyright 2007 - 2009 Red Hat, Inc.
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*/
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#include "nm-default.h"
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#include <prinit.h>
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#include <nss.h>
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#include <pk11pub.h>
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#include <pkcs11t.h>
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#include <cert.h>
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#include <prerror.h>
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#include <p12.h>
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#include <ciferfam.h>
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#include <p12plcy.h>
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#include "crypto.h"
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#include "nm-errors.h"
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static gboolean initialized = FALSE;
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gboolean
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crypto_init (GError **error)
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{
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SECStatus ret;
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if (initialized)
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return TRUE;
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PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 1);
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ret = NSS_NoDB_Init (NULL);
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if (ret != SECSuccess) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_FAILED,
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_("Failed to initialize the crypto engine: %d."),
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PR_GetError ());
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PR_Cleanup ();
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return FALSE;
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}
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SEC_PKCS12EnableCipher(PKCS12_RC4_40, 1);
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SEC_PKCS12EnableCipher(PKCS12_RC4_128, 1);
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SEC_PKCS12EnableCipher(PKCS12_RC2_CBC_40, 1);
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SEC_PKCS12EnableCipher(PKCS12_RC2_CBC_128, 1);
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SEC_PKCS12EnableCipher(PKCS12_DES_56, 1);
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SEC_PKCS12EnableCipher(PKCS12_DES_EDE3_168, 1);
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SEC_PKCS12SetPreferredCipher(PKCS12_DES_EDE3_168, 1);
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initialized = TRUE;
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return TRUE;
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}
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char *
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crypto_decrypt (const char *cipher,
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int key_type,
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const guint8 *data,
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gsize data_len,
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const char *iv,
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const gsize iv_len,
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const char *key,
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const gsize key_len,
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gsize *out_len,
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GError **error)
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{
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char *output = NULL;
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int decrypted_len = 0;
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CK_MECHANISM_TYPE cipher_mech;
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PK11SlotInfo *slot = NULL;
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SECItem key_item;
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PK11SymKey *sym_key = NULL;
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SECItem *sec_param = NULL;
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PK11Context *ctx = NULL;
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SECStatus s;
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gboolean success = FALSE;
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unsigned int pad_len = 0, extra = 0;
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guint32 i, real_iv_len = 0;
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if (!crypto_init (error))
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return NULL;
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if (!strcmp (cipher, CIPHER_DES_EDE3_CBC)) {
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cipher_mech = CKM_DES3_CBC_PAD;
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real_iv_len = 8;
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} else if (!strcmp (cipher, CIPHER_DES_CBC)) {
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cipher_mech = CKM_DES_CBC_PAD;
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real_iv_len = 8;
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} else if (!strcmp (cipher, CIPHER_AES_CBC)) {
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cipher_mech = CKM_AES_CBC_PAD;
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real_iv_len = 16;
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} else {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_UNKNOWN_CIPHER,
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_("Private key cipher '%s' was unknown."),
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cipher);
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return NULL;
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}
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if (iv_len < real_iv_len) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_INVALID_DATA,
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_("Invalid IV length (must be at least %d)."),
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real_iv_len);
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return NULL;
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}
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output = g_malloc0 (data_len);
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slot = PK11_GetBestSlot (cipher_mech, NULL);
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if (!slot) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_FAILED,
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_("Failed to initialize the decryption cipher slot."));
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goto out;
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}
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key_item.data = (unsigned char *) key;
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key_item.len = key_len;
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sym_key = PK11_ImportSymKey (slot, cipher_mech, PK11_OriginUnwrap, CKA_DECRYPT, &key_item, NULL);
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if (!sym_key) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_DECRYPTION_FAILED,
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_("Failed to set symmetric key for decryption."));
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goto out;
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}
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key_item.data = (unsigned char *) iv;
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key_item.len = real_iv_len;
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sec_param = PK11_ParamFromIV (cipher_mech, &key_item);
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if (!sec_param) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_DECRYPTION_FAILED,
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_("Failed to set IV for decryption."));
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goto out;
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}
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ctx = PK11_CreateContextBySymKey (cipher_mech, CKA_DECRYPT, sym_key, sec_param);
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if (!ctx) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_DECRYPTION_FAILED,
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_("Failed to initialize the decryption context."));
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goto out;
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}
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s = PK11_CipherOp (ctx,
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(unsigned char *) output,
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&decrypted_len,
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data_len,
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data,
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data_len);
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if (s != SECSuccess) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_DECRYPTION_FAILED,
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_("Failed to decrypt the private key: %d."),
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PORT_GetError ());
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goto out;
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}
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if (decrypted_len > data_len) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_DECRYPTION_FAILED,
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_("Failed to decrypt the private key: decrypted data too large."));
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goto out;
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}
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s = PK11_DigestFinal (ctx,
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(unsigned char *) (output + decrypted_len),
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&extra,
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data_len - decrypted_len);
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if (s != SECSuccess) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_DECRYPTION_FAILED,
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_("Failed to finalize decryption of the private key: %d."),
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PORT_GetError ());
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goto out;
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}
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decrypted_len += extra;
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pad_len = data_len - decrypted_len;
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/* Check if the padding at the end of the decrypted data is valid */
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if (pad_len == 0 || pad_len > real_iv_len) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_DECRYPTION_FAILED,
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_("Failed to decrypt the private key: unexpected padding length."));
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goto out;
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}
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/* Validate tail padding; last byte is the padding size, and all pad bytes
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* should contain the padding size.
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*/
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for (i = pad_len; i > 0; i--) {
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if (output[data_len - i] != pad_len) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_DECRYPTION_FAILED,
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_("Failed to decrypt the private key."));
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goto out;
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}
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}
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*out_len = decrypted_len;
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success = TRUE;
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out:
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if (ctx)
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PK11_DestroyContext (ctx, PR_TRUE);
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if (sym_key)
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PK11_FreeSymKey (sym_key);
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if (sec_param)
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SECITEM_FreeItem (sec_param, PR_TRUE);
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if (slot)
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PK11_FreeSlot (slot);
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if (!success) {
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if (output) {
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/* Don't expose key material */
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memset (output, 0, data_len);
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g_free (output);
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output = NULL;
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}
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}
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return output;
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}
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char *
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crypto_encrypt (const char *cipher,
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const guint8 *data,
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gsize data_len,
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const char *iv,
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gsize iv_len,
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const char *key,
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gsize key_len,
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gsize *out_len,
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GError **error)
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{
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SECStatus ret;
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CK_MECHANISM_TYPE cipher_mech = CKM_DES3_CBC_PAD;
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PK11SlotInfo *slot = NULL;
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SECItem key_item = { .data = (unsigned char *) key, .len = key_len };
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SECItem iv_item = { .data = (unsigned char *) iv, .len = iv_len };
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PK11SymKey *sym_key = NULL;
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SECItem *sec_param = NULL;
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PK11Context *ctx = NULL;
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unsigned char *output, *padded_buf;
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gsize output_len;
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int encrypted_len = 0, i;
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gboolean success = FALSE;
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gsize padded_buf_len, pad_len;
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if (!crypto_init (error))
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return NULL;
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if (!strcmp (cipher, CIPHER_DES_EDE3_CBC))
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cipher_mech = CKM_DES3_CBC_PAD;
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else if (!strcmp (cipher, CIPHER_AES_CBC))
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cipher_mech = CKM_AES_CBC_PAD;
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else {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_UNKNOWN_CIPHER,
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_("Private key cipher '%s' was unknown."),
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cipher);
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return NULL;
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}
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/* If data->len % ivlen == 0, then we add another complete block
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* onto the end so that the decrypter knows there's padding.
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*/
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pad_len = iv_len - (data_len % iv_len);
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output_len = padded_buf_len = data_len + pad_len;
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padded_buf = g_malloc0 (padded_buf_len);
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memcpy (padded_buf, data, data_len);
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for (i = 0; i < pad_len; i++)
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padded_buf[data_len + i] = (guint8) (pad_len & 0xFF);
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output = g_malloc0 (output_len);
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slot = PK11_GetBestSlot (cipher_mech, NULL);
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if (!slot) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_FAILED,
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_("Failed to initialize the encryption cipher slot."));
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goto out;
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}
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sym_key = PK11_ImportSymKey (slot, cipher_mech, PK11_OriginUnwrap, CKA_ENCRYPT, &key_item, NULL);
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if (!sym_key) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_ENCRYPTION_FAILED,
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_("Failed to set symmetric key for encryption."));
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goto out;
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}
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sec_param = PK11_ParamFromIV (cipher_mech, &iv_item);
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if (!sec_param) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_ENCRYPTION_FAILED,
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_("Failed to set IV for encryption."));
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goto out;
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}
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ctx = PK11_CreateContextBySymKey (cipher_mech, CKA_ENCRYPT, sym_key, sec_param);
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if (!ctx) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_ENCRYPTION_FAILED,
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_("Failed to initialize the encryption context."));
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goto out;
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}
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ret = PK11_CipherOp (ctx, output, &encrypted_len, output_len, padded_buf, padded_buf_len);
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if (ret != SECSuccess) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_ENCRYPTION_FAILED,
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_("Failed to encrypt: %d."),
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PORT_GetError ());
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goto out;
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}
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if (encrypted_len != output_len) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_ENCRYPTION_FAILED,
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_("Unexpected amount of data after encrypting."));
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goto out;
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}
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*out_len = encrypted_len;
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success = TRUE;
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out:
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if (ctx)
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PK11_DestroyContext (ctx, PR_TRUE);
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if (sym_key)
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PK11_FreeSymKey (sym_key);
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if (sec_param)
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SECITEM_FreeItem (sec_param, PR_TRUE);
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if (slot)
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PK11_FreeSlot (slot);
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memset (padded_buf, 0, padded_buf_len);
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g_free (padded_buf);
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if (!success) {
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memset (output, 0, output_len);
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g_free (output);
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output = NULL;
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}
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return (char *) output;
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}
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NMCryptoFileFormat
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crypto_verify_cert (const unsigned char *data,
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gsize len,
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GError **error)
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{
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CERTCertificate *cert;
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if (!crypto_init (error))
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return NM_CRYPTO_FILE_FORMAT_UNKNOWN;
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/* Try DER/PEM first */
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cert = CERT_DecodeCertFromPackage ((char *) data, len);
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if (!cert) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_INVALID_DATA,
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_("Couldn't decode certificate: %d"),
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PORT_GetError());
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return NM_CRYPTO_FILE_FORMAT_UNKNOWN;
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}
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CERT_DestroyCertificate (cert);
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return NM_CRYPTO_FILE_FORMAT_X509;
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}
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gboolean
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crypto_verify_pkcs12 (const guint8 *data,
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gsize data_len,
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const char *password,
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GError **error)
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{
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SEC_PKCS12DecoderContext *p12ctx = NULL;
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SECItem pw = { 0 };
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PK11SlotInfo *slot = NULL;
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SECStatus s;
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gunichar2 *ucs2_password;
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glong ucs2_chars = 0;
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#ifndef WORDS_BIGENDIAN
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guint16 *p;
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#endif /* WORDS_BIGENDIAN */
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if (error)
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g_return_val_if_fail (*error == NULL, FALSE);
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if (!crypto_init (error))
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return FALSE;
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/* PKCS#12 passwords are apparently UCS2 BIG ENDIAN, and NSS doesn't do
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* any conversions for us.
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*/
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if (password && *password) {
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if (!g_utf8_validate (password, -1, NULL)) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_INVALID_PASSWORD,
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_("Password must be UTF-8"));
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return FALSE;
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}
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ucs2_password = g_utf8_to_utf16 (password, strlen (password), NULL, &ucs2_chars, NULL);
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/* Can't fail if g_utf8_validate() succeeded */
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g_return_val_if_fail (ucs2_password != NULL && ucs2_chars != 0, FALSE);
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ucs2_chars *= 2; /* convert # UCS2 characters -> bytes */
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pw.data = PORT_ZAlloc(ucs2_chars + 2);
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memcpy (pw.data, ucs2_password, ucs2_chars);
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pw.len = ucs2_chars + 2; /* include terminating NULL */
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memset (ucs2_password, 0, ucs2_chars);
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g_free (ucs2_password);
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#ifndef WORDS_BIGENDIAN
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for (p = (guint16 *) pw.data; p < (guint16 *) (pw.data + pw.len); p++)
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*p = GUINT16_SWAP_LE_BE (*p);
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#endif /* WORDS_BIGENDIAN */
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} else {
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/* NULL password */
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pw.data = NULL;
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pw.len = 0;
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}
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slot = PK11_GetInternalKeySlot();
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p12ctx = SEC_PKCS12DecoderStart (&pw, slot, NULL, NULL, NULL, NULL, NULL, NULL);
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if (!p12ctx) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_FAILED,
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_("Couldn't initialize PKCS#12 decoder: %d"),
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PORT_GetError());
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goto error;
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}
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s = SEC_PKCS12DecoderUpdate (p12ctx, (guint8 *)data, data_len);
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if (s != SECSuccess) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_INVALID_DATA,
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_("Couldn't decode PKCS#12 file: %d"),
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PORT_GetError());
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goto error;
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}
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s = SEC_PKCS12DecoderVerify (p12ctx);
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if (s != SECSuccess) {
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g_set_error (error, NM_CRYPTO_ERROR,
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NM_CRYPTO_ERROR_DECRYPTION_FAILED,
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_("Couldn't verify PKCS#12 file: %d"),
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PORT_GetError());
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goto error;
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}
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SEC_PKCS12DecoderFinish (p12ctx);
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SECITEM_ZfreeItem (&pw, PR_FALSE);
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return TRUE;
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error:
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if (p12ctx)
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SEC_PKCS12DecoderFinish (p12ctx);
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if (slot)
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PK11_FreeSlot(slot);
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SECITEM_ZfreeItem (&pw, PR_FALSE);
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return FALSE;
|
|
}
|
|
|
|
gboolean
|
|
crypto_verify_pkcs8 (const guint8 *data,
|
|
gsize data_len,
|
|
gboolean is_encrypted,
|
|
const char *password,
|
|
GError **error)
|
|
{
|
|
g_return_val_if_fail (data != NULL, FALSE);
|
|
|
|
if (!crypto_init (error))
|
|
return FALSE;
|
|
|
|
/* NSS apparently doesn't do PKCS#8 natively, but you have to put the
|
|
* PKCS#8 key into a PKCS#12 file and import that?? So until we figure
|
|
* all that out, we can only assume the password is valid.
|
|
*/
|
|
return TRUE;
|
|
}
|
|
|
|
gboolean
|
|
crypto_randomize (void *buffer, gsize buffer_len, GError **error)
|
|
{
|
|
SECStatus s;
|
|
|
|
if (!crypto_init (error))
|
|
return FALSE;
|
|
|
|
s = PK11_GenerateRandom (buffer, buffer_len);
|
|
if (s != SECSuccess) {
|
|
g_set_error_literal (error, NM_CRYPTO_ERROR,
|
|
NM_CRYPTO_ERROR_FAILED,
|
|
_("Could not generate random data."));
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|