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-rw-r--r--libcli/auth/smbdes.c213
1 files changed, 213 insertions, 0 deletions
diff --git a/libcli/auth/smbdes.c b/libcli/auth/smbdes.c
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+/*
+ Unix SMB/CIFS implementation.
+
+ a partial implementation of DES designed for use in the
+ SMB authentication protocol
+
+ Copyright (C) Andrew Tridgell 1998
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "libcli/auth/libcli_auth.h"
+
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+
+static void str_to_key(const uint8_t *str,uint8_t *key)
+{
+ int i;
+
+ key[0] = str[0]>>1;
+ key[1] = ((str[0]&0x01)<<6) | (str[1]>>2);
+ key[2] = ((str[1]&0x03)<<5) | (str[2]>>3);
+ key[3] = ((str[2]&0x07)<<4) | (str[3]>>4);
+ key[4] = ((str[3]&0x0F)<<3) | (str[4]>>5);
+ key[5] = ((str[4]&0x1F)<<2) | (str[5]>>6);
+ key[6] = ((str[5]&0x3F)<<1) | (str[6]>>7);
+ key[7] = str[6]&0x7F;
+ for (i=0;i<8;i++) {
+ key[i] = (key[i]<<1);
+ }
+}
+
+int des_crypt56_gnutls(uint8_t out[8], const uint8_t in[8],
+ const uint8_t key_in[7],
+ enum samba_gnutls_direction encrypt)
+{
+ /*
+ * A single block DES-CBC op, with an all-zero IV is the same as DES
+ * because the IV is combined with the data using XOR.
+ * This allows us to use GNUTLS_CIPHER_DES_CBC from GnuTLS and not
+ * implement single-DES in Samba.
+ *
+ * In turn this is used to build DES-ECB, which is used
+ * for example in the NTLM challenge/response calculation.
+ */
+ static const uint8_t iv8[8];
+ gnutls_datum_t iv = { discard_const(iv8), 8 };
+ gnutls_datum_t key;
+ gnutls_cipher_hd_t ctx;
+ uint8_t key2[8];
+ uint8_t outb[8];
+ int ret;
+
+ memset(out, 0, 8);
+
+ str_to_key(key_in, key2);
+
+ key.data = key2;
+ key.size = 8;
+
+ ret = gnutls_global_init();
+ if (ret != 0) {
+ return ret;
+ }
+
+ ret = gnutls_cipher_init(&ctx, GNUTLS_CIPHER_DES_CBC, &key, &iv);
+ if (ret != 0) {
+ return ret;
+ }
+
+ memcpy(outb, in, 8);
+ if (encrypt == SAMBA_GNUTLS_ENCRYPT) {
+ ret = gnutls_cipher_encrypt(ctx, outb, 8);
+ } else {
+ ret = gnutls_cipher_decrypt(ctx, outb, 8);
+ }
+
+ if (ret == 0) {
+ memcpy(out, outb, 8);
+ }
+
+ gnutls_cipher_deinit(ctx);
+
+ return ret;
+}
+
+int E_P16(const uint8_t *p14,uint8_t *p16)
+{
+ const uint8_t sp8[8] = {0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25};
+ int ret;
+
+ ret = des_crypt56_gnutls(p16, sp8, p14, SAMBA_GNUTLS_ENCRYPT);
+ if (ret != 0) {
+ return ret;
+ }
+
+ return des_crypt56_gnutls(p16+8, sp8, p14+7, SAMBA_GNUTLS_ENCRYPT);
+}
+
+int E_P24(const uint8_t *p21, const uint8_t *c8, uint8_t *p24)
+{
+ int ret;
+
+ ret = des_crypt56_gnutls(p24, c8, p21, SAMBA_GNUTLS_ENCRYPT);
+ if (ret != 0) {
+ return ret;
+ }
+
+ ret = des_crypt56_gnutls(p24+8, c8, p21+7, SAMBA_GNUTLS_ENCRYPT);
+ if (ret != 0) {
+ return ret;
+ }
+
+ return des_crypt56_gnutls(p24+16, c8, p21+14, SAMBA_GNUTLS_ENCRYPT);
+}
+
+int E_old_pw_hash( uint8_t *p14, const uint8_t *in, uint8_t *out)
+{
+ int ret;
+
+ ret = des_crypt56_gnutls(out, in, p14, SAMBA_GNUTLS_ENCRYPT);
+ if (ret != 0) {
+ return ret;
+ }
+
+ return des_crypt56_gnutls(out+8, in+8, p14+7, SAMBA_GNUTLS_ENCRYPT);
+}
+
+/* des encryption with a 128 bit key */
+int des_crypt128(uint8_t out[8], const uint8_t in[8], const uint8_t key[16])
+{
+ uint8_t buf[8];
+ int ret;
+
+ ret = des_crypt56_gnutls(buf, in, key, SAMBA_GNUTLS_ENCRYPT);
+ if (ret != 0) {
+ return ret;
+ }
+
+ return des_crypt56_gnutls(out, buf, key+9, SAMBA_GNUTLS_ENCRYPT);
+}
+
+/* des encryption with a 112 bit (14 byte) key */
+int des_crypt112(uint8_t out[8], const uint8_t in[8], const uint8_t key[14],
+ enum samba_gnutls_direction encrypt)
+{
+ uint8_t buf[8];
+ int ret;
+
+ if (encrypt == SAMBA_GNUTLS_ENCRYPT) {
+ ret = des_crypt56_gnutls(buf, in, key, SAMBA_GNUTLS_ENCRYPT);
+ if (ret != 0) {
+ return ret;
+ }
+
+ return des_crypt56_gnutls(out, buf, key+7, SAMBA_GNUTLS_ENCRYPT);
+ }
+
+ ret = des_crypt56_gnutls(buf, in, key+7, SAMBA_GNUTLS_DECRYPT);
+ if (ret != 0) {
+ return ret;
+ }
+
+ return des_crypt56_gnutls(out, buf, key, SAMBA_GNUTLS_DECRYPT);
+}
+
+/* des encryption of a 16 byte lump of data with a 112 bit key */
+int des_crypt112_16(uint8_t out[16], const uint8_t in[16], const uint8_t key[14],
+ enum samba_gnutls_direction encrypt)
+{
+ int ret;
+
+ ret = des_crypt56_gnutls(out, in, key, encrypt);
+ if (ret != 0) {
+ return ret;
+ }
+
+ return des_crypt56_gnutls(out + 8, in + 8, key+7, encrypt);
+}
+
+/* Decode a sam password hash into a password. The password hash is the
+ same method used to store passwords in the NT registry. The DES key
+ used is based on the RID of the user. */
+int sam_rid_crypt(unsigned int rid, const uint8_t *in, uint8_t *out,
+ enum samba_gnutls_direction encrypt)
+{
+ uint8_t s[14];
+ int ret;
+
+ s[0] = s[4] = s[8] = s[12] = (uint8_t)(rid & 0xFF);
+ s[1] = s[5] = s[9] = s[13] = (uint8_t)((rid >> 8) & 0xFF);
+ s[2] = s[6] = s[10] = (uint8_t)((rid >> 16) & 0xFF);
+ s[3] = s[7] = s[11] = (uint8_t)((rid >> 24) & 0xFF);
+
+ ret = des_crypt56_gnutls(out, in, s, encrypt);
+ if (ret != 0) {
+ return ret;
+ }
+ return des_crypt56_gnutls(out+8, in+8, s+7, encrypt);
+}