1045 lines
30 KiB
C
1045 lines
30 KiB
C
/*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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xrdp: A Remote Desktop Protocol server.
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Copyright (C) Jay Sorg 2004-2010
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secure layer
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*/
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#include "libxrdp.h"
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/* some compilers need unsigned char to avoid warnings */
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static tui8 g_pad_54[40] =
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{ 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54,
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54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54,
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54, 54, 54, 54, 54, 54, 54, 54 };
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/* some compilers need unsigned char to avoid warnings */
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static tui8 g_pad_92[48] =
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{ 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92,
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92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92,
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92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92 };
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/* some compilers need unsigned char to avoid warnings */
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static tui8 g_lic1[322] =
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{ 0x80, 0x00, 0x3e, 0x01, 0x01, 0x02, 0x3e, 0x01,
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0x7b, 0x3c, 0x31, 0xa6, 0xae, 0xe8, 0x74, 0xf6,
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0xb4, 0xa5, 0x03, 0x90, 0xe7, 0xc2, 0xc7, 0x39,
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0xba, 0x53, 0x1c, 0x30, 0x54, 0x6e, 0x90, 0x05,
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0xd0, 0x05, 0xce, 0x44, 0x18, 0x91, 0x83, 0x81,
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0x00, 0x00, 0x04, 0x00, 0x2c, 0x00, 0x00, 0x00,
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0x4d, 0x00, 0x69, 0x00, 0x63, 0x00, 0x72, 0x00,
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0x6f, 0x00, 0x73, 0x00, 0x6f, 0x00, 0x66, 0x00,
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0x74, 0x00, 0x20, 0x00, 0x43, 0x00, 0x6f, 0x00,
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0x72, 0x00, 0x70, 0x00, 0x6f, 0x00, 0x72, 0x00,
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0x61, 0x00, 0x74, 0x00, 0x69, 0x00, 0x6f, 0x00,
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0x6e, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00,
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0x32, 0x00, 0x33, 0x00, 0x36, 0x00, 0x00, 0x00,
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0x0d, 0x00, 0x04, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x03, 0x00, 0xb8, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x06, 0x00, 0x5c, 0x00, 0x52, 0x53, 0x41, 0x31,
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0x48, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00,
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0x3f, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00,
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0x01, 0xc7, 0xc9, 0xf7, 0x8e, 0x5a, 0x38, 0xe4,
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0x29, 0xc3, 0x00, 0x95, 0x2d, 0xdd, 0x4c, 0x3e,
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0x50, 0x45, 0x0b, 0x0d, 0x9e, 0x2a, 0x5d, 0x18,
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0x63, 0x64, 0xc4, 0x2c, 0xf7, 0x8f, 0x29, 0xd5,
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0x3f, 0xc5, 0x35, 0x22, 0x34, 0xff, 0xad, 0x3a,
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0xe6, 0xe3, 0x95, 0x06, 0xae, 0x55, 0x82, 0xe3,
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0xc8, 0xc7, 0xb4, 0xa8, 0x47, 0xc8, 0x50, 0x71,
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0x74, 0x29, 0x53, 0x89, 0x6d, 0x9c, 0xed, 0x70,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x08, 0x00, 0x48, 0x00, 0xa8, 0xf4, 0x31, 0xb9,
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0xab, 0x4b, 0xe6, 0xb4, 0xf4, 0x39, 0x89, 0xd6,
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0xb1, 0xda, 0xf6, 0x1e, 0xec, 0xb1, 0xf0, 0x54,
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0x3b, 0x5e, 0x3e, 0x6a, 0x71, 0xb4, 0xf7, 0x75,
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0xc8, 0x16, 0x2f, 0x24, 0x00, 0xde, 0xe9, 0x82,
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0x99, 0x5f, 0x33, 0x0b, 0xa9, 0xa6, 0x94, 0xaf,
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0xcb, 0x11, 0xc3, 0xf2, 0xdb, 0x09, 0x42, 0x68,
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0x29, 0x56, 0x58, 0x01, 0x56, 0xdb, 0x59, 0x03,
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0x69, 0xdb, 0x7d, 0x37, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x0e, 0x00, 0x0e, 0x00, 0x6d, 0x69, 0x63, 0x72,
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0x6f, 0x73, 0x6f, 0x66, 0x74, 0x2e, 0x63, 0x6f,
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0x6d, 0x00 };
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/* some compilers need unsigned char to avoid warnings */
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static tui8 g_lic2[20] =
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{ 0x80, 0x00, 0x10, 0x00, 0xff, 0x02, 0x10, 0x00,
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0x07, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
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0x28, 0x14, 0x00, 0x00 };
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/* mce */
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/* some compilers need unsigned char to avoid warnings */
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static tui8 g_lic3[20] =
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{ 0x80, 0x02, 0x10, 0x00, 0xff, 0x03, 0x10, 0x00,
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0x07, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
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0xf3, 0x99, 0x00, 0x00 };
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/*****************************************************************************/
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static void APP_CC
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hex_str_to_bin(char* in, char* out, int out_len)
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{
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int in_index;
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int in_len;
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int out_index;
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int val;
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char hex[16];
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in_len = g_strlen(in);
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out_index = 0;
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in_index = 0;
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while (in_index <= (in_len - 4))
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{
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if ((in[in_index] == '0') && (in[in_index + 1] == 'x'))
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{
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hex[0] = in[in_index + 2];
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hex[1] = in[in_index + 3];
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hex[2] = 0;
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if (out_index < out_len)
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{
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val = g_htoi(hex);
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out[out_index] = val;
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}
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out_index++;
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}
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in_index++;
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}
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}
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/*****************************************************************************/
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struct xrdp_sec* APP_CC
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xrdp_sec_create(struct xrdp_rdp* owner, struct trans* trans, int crypt_level,
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int channel_code)
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{
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struct xrdp_sec* self;
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DEBUG((" in xrdp_sec_create"));
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self = (struct xrdp_sec*)g_malloc(sizeof(struct xrdp_sec), 1);
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self->rdp_layer = owner;
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self->rc4_key_size = 1; /* 1 = 40 bit, 2 = 128 bit */
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self->crypt_level = 1; /* 1, 2, 3 = low, medium, high */
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switch (crypt_level)
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{
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case 1:
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self->rc4_key_size = 1;
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self->crypt_level = 1;
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break;
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case 2:
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self->rc4_key_size = 1;
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self->crypt_level = 2;
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break;
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case 3:
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self->rc4_key_size = 2;
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self->crypt_level = 3;
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break;
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default:
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g_writeln("Fatal : Illegal crypt_level");
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break ;
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}
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self->channel_code = channel_code;
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if(self->decrypt_rc4_info!=NULL)
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{
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g_writeln("xrdp_sec_create - decrypt_rc4_info already created !!!");
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}
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self->decrypt_rc4_info = ssl_rc4_info_create();
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if(self->encrypt_rc4_info!=NULL)
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{
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g_writeln("xrdp_sec_create - encrypt_rc4_info already created !!!");
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}
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self->encrypt_rc4_info = ssl_rc4_info_create();
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self->mcs_layer = xrdp_mcs_create(self, trans, &self->client_mcs_data,
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&self->server_mcs_data);
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self->chan_layer = xrdp_channel_create(self, self->mcs_layer);
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DEBUG((" out xrdp_sec_create"));
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return self;
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}
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/*****************************************************************************/
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void APP_CC
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xrdp_sec_delete(struct xrdp_sec* self)
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{
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if (self == 0)
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{
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g_writeln("xrdp_sec_delete: indata is null");
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return;
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}
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xrdp_channel_delete(self->chan_layer);
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xrdp_mcs_delete(self->mcs_layer);
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ssl_rc4_info_delete(self->decrypt_rc4_info); /* TODO clear all data */
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ssl_rc4_info_delete(self->encrypt_rc4_info); /* TODO clear all data */
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g_free(self->client_mcs_data.data);
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g_free(self->server_mcs_data.data);
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/* Crypto information must always be cleared */
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g_memset(self,0,sizeof(struct xrdp_sec));
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g_free(self);
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}
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/*****************************************************************************/
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/* returns error */
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int APP_CC
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xrdp_sec_init(struct xrdp_sec* self, struct stream* s)
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{
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if (xrdp_mcs_init(self->mcs_layer, s) != 0)
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{
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return 1;
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}
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if (self->crypt_level > 1)
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{
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s_push_layer(s, sec_hdr, 4 + 8);
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}
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else
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{
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s_push_layer(s, sec_hdr, 4);
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}
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return 0;
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}
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/*****************************************************************************/
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/* Reduce key entropy from 64 to 40 bits */
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static void APP_CC
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xrdp_sec_make_40bit(char* key)
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{
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key[0] = 0xd1;
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key[1] = 0x26;
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key[2] = 0x9e;
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}
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/*****************************************************************************/
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/* returns error */
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/* update an encryption key */
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static int APP_CC
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xrdp_sec_update(char* key, char* update_key, int key_len)
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{
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char shasig[20];
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void* sha1_info;
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void* md5_info;
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void* rc4_info;
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sha1_info = ssl_sha1_info_create();
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md5_info = ssl_md5_info_create();
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rc4_info = ssl_rc4_info_create();
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ssl_sha1_clear(sha1_info);
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ssl_sha1_transform(sha1_info, update_key, key_len);
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ssl_sha1_transform(sha1_info, (char*)g_pad_54, 40);
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ssl_sha1_transform(sha1_info, key, key_len);
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ssl_sha1_complete(sha1_info, shasig);
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ssl_md5_clear(md5_info);
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ssl_md5_transform(md5_info, update_key, key_len);
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ssl_md5_transform(md5_info, (char*)g_pad_92, 48);
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ssl_md5_transform(md5_info, shasig, 20);
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ssl_md5_complete(md5_info, key);
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ssl_rc4_set_key(rc4_info, key, key_len);
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ssl_rc4_crypt(rc4_info, key, key_len);
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if (key_len == 8)
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{
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xrdp_sec_make_40bit(key);
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}
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ssl_sha1_info_delete(sha1_info);
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ssl_md5_info_delete(md5_info);
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ssl_rc4_info_delete(rc4_info);
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return 0;
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}
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/*****************************************************************************/
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static void APP_CC
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xrdp_sec_decrypt(struct xrdp_sec* self, char* data, int len)
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{
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if (self->decrypt_use_count == 4096)
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{
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xrdp_sec_update(self->decrypt_key, self->decrypt_update_key,
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self->rc4_key_len);
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ssl_rc4_set_key(self->decrypt_rc4_info, self->decrypt_key,
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self->rc4_key_len);
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self->decrypt_use_count = 0;
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}
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ssl_rc4_crypt(self->decrypt_rc4_info, data, len);
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self->decrypt_use_count++;
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}
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/*****************************************************************************/
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static void APP_CC
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xrdp_sec_encrypt(struct xrdp_sec* self, char* data, int len)
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{
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if (self->encrypt_use_count == 4096)
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{
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xrdp_sec_update(self->encrypt_key, self->encrypt_update_key,
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self->rc4_key_len);
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ssl_rc4_set_key(self->encrypt_rc4_info, self->encrypt_key,
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self->rc4_key_len);
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self->encrypt_use_count = 0;
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}
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ssl_rc4_crypt(self->encrypt_rc4_info, data, len);
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self->encrypt_use_count++;
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}
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/*****************************************************************************/
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static int APP_CC
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unicode_in(struct stream* s, int uni_len, char* dst, int dst_len)
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{
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int dst_index;
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int src_index;
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dst_index = 0;
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src_index = 0;
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while (src_index < uni_len)
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{
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if (dst_index >= dst_len || src_index > 512)
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{
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break;
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}
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in_uint8(s, dst[dst_index]);
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in_uint8s(s, 1);
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dst_index++;
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src_index += 2;
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}
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in_uint8s(s, 2);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_sec_process_logon_info(struct xrdp_sec* self, struct stream* s)
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{
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int flags = 0;
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int len_domain = 0;
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int len_user = 0;
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int len_password = 0;
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int len_program = 0;
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int len_directory = 0;
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int len_ip = 0;
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int len_dll = 0;
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int tzone = 0;
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char tmpdata[256];
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/* initialize (zero out) local variables */
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g_memset(tmpdata,0,sizeof(char)*256);
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in_uint8s(s, 4);
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in_uint32_le(s, flags);
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DEBUG(("in xrdp_sec_process_logon_info flags $%x", flags));
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/* this is the first test that the decrypt is working */
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if ((flags & RDP_LOGON_NORMAL) != RDP_LOGON_NORMAL) /* 0x33 */
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{ /* must be or error */
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DEBUG(("xrdp_sec_process_logon_info: flags wrong, major error"));
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return 1;
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}
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if (flags & RDP_LOGON_LEAVE_AUDIO)
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{
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self->rdp_layer->client_info.sound_code = 1;
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DEBUG(("flag RDP_LOGON_LEAVE_AUDIO found"));
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}
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if ((flags & RDP_LOGON_AUTO) && (!self->rdp_layer->client_info.is_mce))
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/* todo, for now not allowing autologon and mce both */
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{
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self->rdp_layer->client_info.rdp_autologin = 1;
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DEBUG(("flag RDP_LOGON_AUTO found"));
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}
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if (flags & RDP_COMPRESSION)
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{
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self->rdp_layer->client_info.rdp_compression = 1;
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DEBUG(("flag RDP_COMPRESSION found"));
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}
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in_uint16_le(s, len_domain);
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if (len_domain > 511) {
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DEBUG(("ERROR [xrdp_sec_process_logon_info()]: len_domain > 511"));
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return 1;
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}
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in_uint16_le(s, len_user);
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if (len_user > 511) {
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DEBUG(("ERROR [xrdp_sec_process_logon_info()]: len_user > 511"));
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return 1;
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}
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in_uint16_le(s, len_password);
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if (len_password > 511) {
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DEBUG(("ERROR [xrdp_sec_process_logon_info()]: len_password > 511"));
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return 1;
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}
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in_uint16_le(s, len_program);
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if (len_program > 511) {
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DEBUG(("ERROR [xrdp_sec_process_logon_info()]: len_program > 511"));
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return 1;
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}
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in_uint16_le(s, len_directory);
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if (len_directory > 511) {
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DEBUG(("ERROR [xrdp_sec_process_logon_info()]: len_directory > 511"));
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return 1;
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}
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unicode_in(s, len_domain, self->rdp_layer->client_info.domain, 255);
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DEBUG(("domain %s", self->rdp_layer->client_info.domain));
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unicode_in(s, len_user, self->rdp_layer->client_info.username, 255);
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DEBUG(("username %s", self->rdp_layer->client_info.username));
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if (flags & RDP_LOGON_AUTO)
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{
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unicode_in(s, len_password, self->rdp_layer->client_info.password, 255);
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DEBUG(("flag RDP_LOGON_AUTO found"));
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}
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else
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{
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in_uint8s(s, len_password + 2);
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}
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unicode_in(s, len_program, self->rdp_layer->client_info.program, 255);
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DEBUG(("program %s", self->rdp_layer->client_info.program));
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unicode_in(s, len_directory, self->rdp_layer->client_info.directory, 255);
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DEBUG(("directory %s", self->rdp_layer->client_info.directory));
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if (flags & RDP_LOGON_BLOB)
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{
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in_uint8s(s, 2); /* unknown */
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in_uint16_le(s, len_ip);
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unicode_in(s, len_ip - 2, tmpdata, 255);
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in_uint16_le(s, len_dll);
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unicode_in(s, len_dll - 2, tmpdata, 255);
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in_uint32_le(s, tzone); /* len of timetone */
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in_uint8s(s, 62); /* skip */
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in_uint8s(s, 22); /* skip misc. */
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in_uint8s(s, 62); /* skip */
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in_uint8s(s, 26); /* skip stuff */
|
|
in_uint32_le(s, self->rdp_layer->client_info.rdp5_performanceflags);
|
|
}
|
|
DEBUG(("out xrdp_sec_process_logon_info"));
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_sec_send_lic_initial(struct xrdp_sec* self)
|
|
{
|
|
struct stream* s = (struct stream *)NULL;
|
|
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
if (xrdp_mcs_init(self->mcs_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
out_uint8a(s, g_lic1, 322);
|
|
s_mark_end(s);
|
|
if (xrdp_mcs_send(self->mcs_layer, s, MCS_GLOBAL_CHANNEL) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
free_stream(s);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_sec_send_lic_response(struct xrdp_sec* self)
|
|
{
|
|
struct stream* s;
|
|
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
if (xrdp_mcs_init(self->mcs_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
out_uint8a(s, g_lic2, 20);
|
|
s_mark_end(s);
|
|
if (xrdp_mcs_send(self->mcs_layer, s, MCS_GLOBAL_CHANNEL) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
free_stream(s);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_sec_send_media_lic_response(struct xrdp_sec* self)
|
|
{
|
|
struct stream* s;
|
|
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
if (xrdp_mcs_init(self->mcs_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
out_uint8a(s, g_lic3, sizeof(g_lic3));
|
|
s_mark_end(s);
|
|
if (xrdp_mcs_send(self->mcs_layer, s, MCS_GLOBAL_CHANNEL) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
free_stream(s);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
static void APP_CC
|
|
xrdp_sec_rsa_op(char* out, char* in, char* mod, char* exp)
|
|
{
|
|
ssl_mod_exp(out, 64, in, 64, mod, 64, exp, 64);
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
static void APP_CC
|
|
xrdp_sec_hash_48(char* out, char* in, char* salt1, char* salt2, int salt)
|
|
{
|
|
int i;
|
|
void* sha1_info;
|
|
void* md5_info;
|
|
char pad[4];
|
|
char sha1_sig[20];
|
|
char md5_sig[16];
|
|
|
|
sha1_info = ssl_sha1_info_create();
|
|
md5_info = ssl_md5_info_create();
|
|
for (i = 0; i < 3; i++)
|
|
{
|
|
g_memset(pad, salt + i, 4);
|
|
ssl_sha1_clear(sha1_info);
|
|
ssl_sha1_transform(sha1_info, pad, i + 1);
|
|
ssl_sha1_transform(sha1_info, in, 48);
|
|
ssl_sha1_transform(sha1_info, salt1, 32);
|
|
ssl_sha1_transform(sha1_info, salt2, 32);
|
|
ssl_sha1_complete(sha1_info, sha1_sig);
|
|
ssl_md5_clear(md5_info);
|
|
ssl_md5_transform(md5_info, in, 48);
|
|
ssl_md5_transform(md5_info, sha1_sig, 20);
|
|
ssl_md5_complete(md5_info, md5_sig);
|
|
g_memcpy(out + i * 16, md5_sig, 16);
|
|
}
|
|
ssl_sha1_info_delete(sha1_info);
|
|
ssl_md5_info_delete(md5_info);
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
static void APP_CC
|
|
xrdp_sec_hash_16(char* out, char* in, char* salt1, char* salt2)
|
|
{
|
|
void* md5_info;
|
|
|
|
md5_info = ssl_md5_info_create();
|
|
ssl_md5_clear(md5_info);
|
|
ssl_md5_transform(md5_info, in, 16);
|
|
ssl_md5_transform(md5_info, salt1, 32);
|
|
ssl_md5_transform(md5_info, salt2, 32);
|
|
ssl_md5_complete(md5_info, out);
|
|
ssl_md5_info_delete(md5_info);
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
static void APP_CC
|
|
xrdp_sec_establish_keys(struct xrdp_sec* self)
|
|
{
|
|
char session_key[48];
|
|
char temp_hash[48];
|
|
char input[48];
|
|
|
|
g_memcpy(input, self->client_random, 24);
|
|
g_memcpy(input + 24, self->server_random, 24);
|
|
xrdp_sec_hash_48(temp_hash, input, self->client_random,
|
|
self->server_random, 65);
|
|
xrdp_sec_hash_48(session_key, temp_hash, self->client_random,
|
|
self->server_random, 88);
|
|
g_memcpy(self->sign_key, session_key, 16);
|
|
xrdp_sec_hash_16(self->encrypt_key, session_key + 16, self->client_random,
|
|
self->server_random);
|
|
xrdp_sec_hash_16(self->decrypt_key, session_key + 32, self->client_random,
|
|
self->server_random);
|
|
if (self->rc4_key_size == 1)
|
|
{
|
|
xrdp_sec_make_40bit(self->sign_key);
|
|
xrdp_sec_make_40bit(self->encrypt_key);
|
|
xrdp_sec_make_40bit(self->decrypt_key);
|
|
self->rc4_key_len = 8;
|
|
}
|
|
else
|
|
{
|
|
self->rc4_key_len = 16;
|
|
}
|
|
g_memcpy(self->decrypt_update_key, self->decrypt_key, 16);
|
|
g_memcpy(self->encrypt_update_key, self->encrypt_key, 16);
|
|
ssl_rc4_set_key(self->decrypt_rc4_info, self->decrypt_key, self->rc4_key_len);
|
|
ssl_rc4_set_key(self->encrypt_rc4_info, self->encrypt_key, self->rc4_key_len);
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_sec_recv(struct xrdp_sec* self, struct stream* s, int* chan)
|
|
{
|
|
int flags;
|
|
int len;
|
|
|
|
DEBUG((" in xrdp_sec_recv"));
|
|
if (xrdp_mcs_recv(self->mcs_layer, s, chan) != 0)
|
|
{
|
|
DEBUG((" out xrdp_sec_recv error"));
|
|
return 1;
|
|
}
|
|
in_uint32_le(s, flags);
|
|
DEBUG((" in xrdp_sec_recv flags $%x", flags));
|
|
if (flags & SEC_ENCRYPT) /* 0x08 */
|
|
{
|
|
in_uint8s(s, 8); /* signature */
|
|
xrdp_sec_decrypt(self, s->p, (int)(s->end - s->p));
|
|
}
|
|
if (flags & SEC_CLIENT_RANDOM) /* 0x01 */
|
|
{
|
|
in_uint32_le(s, len);
|
|
in_uint8a(s, self->client_crypt_random, 64);
|
|
xrdp_sec_rsa_op(self->client_random, self->client_crypt_random,
|
|
self->pub_mod, self->pri_exp);
|
|
xrdp_sec_establish_keys(self);
|
|
*chan = 1; /* just set a non existing channel and exit */
|
|
DEBUG((" out xrdp_sec_recv"));
|
|
return 0;
|
|
}
|
|
if (flags & SEC_LOGON_INFO) /* 0x40 */
|
|
{
|
|
if (xrdp_sec_process_logon_info(self, s) != 0)
|
|
{
|
|
DEBUG((" out xrdp_sec_recv error"));
|
|
return 1;
|
|
}
|
|
if (self->rdp_layer->client_info.is_mce)
|
|
{
|
|
if (xrdp_sec_send_media_lic_response(self) != 0)
|
|
{
|
|
DEBUG((" out xrdp_sec_recv error"));
|
|
return 1;
|
|
}
|
|
DEBUG((" out xrdp_sec_recv"));
|
|
return -1; /* special error that means send demand active */
|
|
}
|
|
if (xrdp_sec_send_lic_initial(self) != 0)
|
|
{
|
|
DEBUG((" out xrdp_sec_recv error"));
|
|
return 1;
|
|
}
|
|
*chan = 1; /* just set a non existing channel and exit */
|
|
DEBUG((" out xrdp_sec_recv"));
|
|
return 0;
|
|
}
|
|
if (flags & SEC_LICENCE_NEG) /* 0x80 */
|
|
{
|
|
if (xrdp_sec_send_lic_response(self) != 0)
|
|
{
|
|
DEBUG((" out xrdp_sec_recv error"));
|
|
return 1;
|
|
}
|
|
DEBUG((" out xrdp_sec_recv"));
|
|
return -1; /* special error that means send demand active */
|
|
}
|
|
DEBUG((" out xrdp_sec_recv"));
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* Output a uint32 into a buffer (little-endian) */
|
|
static void
|
|
buf_out_uint32(char* buffer, int value)
|
|
{
|
|
buffer[0] = (value) & 0xff;
|
|
buffer[1] = (value >> 8) & 0xff;
|
|
buffer[2] = (value >> 16) & 0xff;
|
|
buffer[3] = (value >> 24) & 0xff;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* Generate a MAC hash (5.2.3.1), using a combination of SHA1 and MD5 */
|
|
static void APP_CC
|
|
xrdp_sec_sign(struct xrdp_sec* self, char* out, int out_len,
|
|
char* data, int data_len)
|
|
{
|
|
char shasig[20];
|
|
char md5sig[16];
|
|
char lenhdr[4];
|
|
void* sha1_info;
|
|
void* md5_info;
|
|
|
|
buf_out_uint32(lenhdr, data_len);
|
|
sha1_info = ssl_sha1_info_create();
|
|
md5_info = ssl_md5_info_create();
|
|
ssl_sha1_clear(sha1_info);
|
|
ssl_sha1_transform(sha1_info, self->sign_key, self->rc4_key_len);
|
|
ssl_sha1_transform(sha1_info, (char*)g_pad_54, 40);
|
|
ssl_sha1_transform(sha1_info, lenhdr, 4);
|
|
ssl_sha1_transform(sha1_info, data, data_len);
|
|
ssl_sha1_complete(sha1_info, shasig);
|
|
ssl_md5_clear(md5_info);
|
|
ssl_md5_transform(md5_info, self->sign_key, self->rc4_key_len);
|
|
ssl_md5_transform(md5_info, (char*)g_pad_92, 48);
|
|
ssl_md5_transform(md5_info, shasig, 20);
|
|
ssl_md5_complete(md5_info, md5sig);
|
|
g_memcpy(out, md5sig, out_len);
|
|
ssl_sha1_info_delete(sha1_info);
|
|
ssl_md5_info_delete(md5_info);
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_sec_send(struct xrdp_sec* self, struct stream* s, int chan)
|
|
{
|
|
int datalen;
|
|
|
|
DEBUG((" in xrdp_sec_send"));
|
|
s_pop_layer(s, sec_hdr);
|
|
if (self->crypt_level > 1)
|
|
{
|
|
out_uint32_le(s, SEC_ENCRYPT);
|
|
datalen = (int)((s->end - s->p) - 8);
|
|
xrdp_sec_sign(self, s->p, 8, s->p + 8, datalen);
|
|
xrdp_sec_encrypt(self, s->p + 8, datalen);
|
|
}
|
|
else
|
|
{
|
|
out_uint32_le(s, 0);
|
|
}
|
|
if (xrdp_mcs_send(self->mcs_layer, s, chan) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
DEBUG((" out xrdp_sec_send"));
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* this adds the mcs channels in the list of channels to be used when
|
|
creating the server mcs data */
|
|
static int APP_CC
|
|
xrdp_sec_process_mcs_data_channels(struct xrdp_sec* self, struct stream* s)
|
|
{
|
|
int num_channels;
|
|
int index;
|
|
struct mcs_channel_item* channel_item;
|
|
|
|
DEBUG(("processing channels, channel_code is %d", self->channel_code));
|
|
/* this is an option set in xrdp.ini */
|
|
if (self->channel_code != 1) /* are channels on? */
|
|
{
|
|
g_writeln("Processing channel data from client - The channel is off");
|
|
return 0;
|
|
}
|
|
if (!s_check_rem(s, 4))
|
|
{
|
|
return 1;
|
|
}
|
|
in_uint32_le(s, num_channels);
|
|
if (num_channels > 256)
|
|
{
|
|
return 1;
|
|
}
|
|
for (index = 0; index < num_channels; index++)
|
|
{
|
|
channel_item = (struct mcs_channel_item*)
|
|
g_malloc(sizeof(struct mcs_channel_item), 1);
|
|
if (!s_check_rem(s, 12))
|
|
{
|
|
return 1;
|
|
}
|
|
in_uint8a(s, channel_item->name, 8);
|
|
in_uint32_le(s, channel_item->flags);
|
|
channel_item->chanid = MCS_GLOBAL_CHANNEL + (index + 1);
|
|
list_add_item(self->mcs_layer->channel_list, (tintptr)channel_item);
|
|
DEBUG(("got channel flags %8.8x name %s", channel_item->flags,
|
|
channel_item->name));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* process client mcs data, we need some things in here to create the server
|
|
mcs data */
|
|
int APP_CC
|
|
xrdp_sec_process_mcs_data(struct xrdp_sec* self)
|
|
{
|
|
struct stream* s = (struct stream *)NULL;
|
|
char* hold_p = (char *)NULL;
|
|
int tag = 0;
|
|
int size = 0;
|
|
|
|
s = &(self->client_mcs_data);
|
|
/* set p to beginning */
|
|
s->p = s->data;
|
|
/* skip header */
|
|
if (!s_check_rem(s, 23))
|
|
{
|
|
return 1;
|
|
}
|
|
in_uint8s(s, 23);
|
|
while (s_check_rem(s, 4))
|
|
{
|
|
hold_p = s->p;
|
|
in_uint16_le(s, tag);
|
|
in_uint16_le(s, size);
|
|
if (size < 4 || !s_check_rem(s, size - 4))
|
|
{
|
|
g_writeln("error in xrdp_sec_process_mcs_data tag %d size %d",
|
|
tag, size);
|
|
break;
|
|
}
|
|
switch (tag)
|
|
{
|
|
case SEC_TAG_CLI_INFO:
|
|
break;
|
|
case SEC_TAG_CLI_CRYPT:
|
|
break;
|
|
case SEC_TAG_CLI_CHANNELS:
|
|
xrdp_sec_process_mcs_data_channels(self, s);
|
|
break;
|
|
case SEC_TAG_CLI_4:
|
|
break;
|
|
default:
|
|
g_writeln("error unknown xrdp_sec_process_mcs_data tag %d size %d",
|
|
tag, size);
|
|
break;
|
|
}
|
|
s->p = hold_p + size;
|
|
}
|
|
/* set p to beginning */
|
|
s->p = s->data;
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* prepare server mcs data to send in mcs layer */
|
|
int APP_CC
|
|
xrdp_sec_out_mcs_data(struct xrdp_sec* self)
|
|
{
|
|
struct stream* s;
|
|
int num_channels_even;
|
|
int num_channels;
|
|
int index;
|
|
int channel;
|
|
|
|
num_channels = self->mcs_layer->channel_list->count;
|
|
num_channels_even = num_channels + (num_channels & 1);
|
|
s = &self->server_mcs_data;
|
|
init_stream(s, 512);
|
|
out_uint16_be(s, 5);
|
|
out_uint16_be(s, 0x14);
|
|
out_uint8(s, 0x7c);
|
|
out_uint16_be(s, 1);
|
|
out_uint8(s, 0x2a);
|
|
out_uint8(s, 0x14);
|
|
out_uint8(s, 0x76);
|
|
out_uint8(s, 0x0a);
|
|
out_uint8(s, 1);
|
|
out_uint8(s, 1);
|
|
out_uint8(s, 0);
|
|
out_uint16_le(s, 0xc001);
|
|
out_uint8(s, 0);
|
|
out_uint8(s, 0x4d); /* M */
|
|
out_uint8(s, 0x63); /* c */
|
|
out_uint8(s, 0x44); /* D */
|
|
out_uint8(s, 0x6e); /* n */
|
|
out_uint16_be(s, 0x80fc + (num_channels_even * 2));
|
|
out_uint16_le(s, SEC_TAG_SRV_INFO);
|
|
out_uint16_le(s, 8); /* len */
|
|
out_uint8(s, 4); /* 4 = rdp5 1 = rdp4 */
|
|
out_uint8(s, 0);
|
|
out_uint8(s, 8);
|
|
out_uint8(s, 0);
|
|
out_uint16_le(s, SEC_TAG_SRV_CHANNELS);
|
|
out_uint16_le(s, 8 + (num_channels_even * 2)); /* len */
|
|
out_uint16_le(s, MCS_GLOBAL_CHANNEL); /* 1003, 0x03eb main channel */
|
|
out_uint16_le(s, num_channels); /* number of other channels */
|
|
for (index = 0; index < num_channels_even; index++)
|
|
{
|
|
if (index < num_channels)
|
|
{
|
|
channel = MCS_GLOBAL_CHANNEL + (index + 1);
|
|
out_uint16_le(s, channel);
|
|
}
|
|
else
|
|
{
|
|
out_uint16_le(s, 0);
|
|
}
|
|
}
|
|
out_uint16_le(s, SEC_TAG_SRV_CRYPT);
|
|
out_uint16_le(s, 0x00ec); /* len is 236 */
|
|
out_uint32_le(s, self->rc4_key_size); /* key len 1 = 40 bit 2 = 128 bit */
|
|
out_uint32_le(s, self->crypt_level); /* crypt level 1 = low 2 = medium */
|
|
/* 3 = high */
|
|
out_uint32_le(s, 32); /* 32 bytes random len */
|
|
out_uint32_le(s, 0xb8); /* 184 bytes rsa info(certificate) len */
|
|
out_uint8a(s, self->server_random, 32);
|
|
/* here to end is certificate */
|
|
/* HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ */
|
|
/* TermService\Parameters\Certificate */
|
|
out_uint32_le(s, 1);
|
|
out_uint32_le(s, 1);
|
|
out_uint32_le(s, 1);
|
|
out_uint16_le(s, SEC_TAG_PUBKEY);
|
|
out_uint16_le(s, 0x005c); /* 92 bytes length of SEC_TAG_PUBKEY */
|
|
out_uint32_le(s, SEC_RSA_MAGIC);
|
|
out_uint32_le(s, 0x48); /* 72 bytes modulus len */
|
|
out_uint32_be(s, 0x00020000);
|
|
out_uint32_be(s, 0x3f000000);
|
|
out_uint8a(s, self->pub_exp, 4); /* pub exp */
|
|
out_uint8a(s, self->pub_mod, 64); /* pub mod */
|
|
out_uint8s(s, 8); /* pad */
|
|
out_uint16_le(s, SEC_TAG_KEYSIG);
|
|
out_uint16_le(s, 72); /* len */
|
|
out_uint8a(s, self->pub_sig, 64); /* pub sig */
|
|
out_uint8s(s, 8); /* pad */
|
|
/* end certificate */
|
|
s_mark_end(s);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* process the mcs client data we received from the mcs layer */
|
|
static int APP_CC
|
|
xrdp_sec_in_mcs_data(struct xrdp_sec* self)
|
|
{
|
|
struct stream* s = (struct stream *)NULL;
|
|
struct xrdp_client_info* client_info = (struct xrdp_client_info *)NULL;
|
|
int index = 0;
|
|
char c = 0;
|
|
|
|
client_info = &(self->rdp_layer->client_info);
|
|
s = &(self->client_mcs_data);
|
|
/* get hostname, its unicode */
|
|
s->p = s->data;
|
|
if (!s_check_rem(s, 47))
|
|
{
|
|
return 1;
|
|
}
|
|
in_uint8s(s, 47);
|
|
g_memset(client_info->hostname, 0, 32);
|
|
c = 1;
|
|
index = 0;
|
|
while (index < 16 && c != 0)
|
|
{
|
|
if (!s_check_rem(s, 2))
|
|
{
|
|
return 1;
|
|
}
|
|
in_uint8(s, c);
|
|
in_uint8s(s, 1);
|
|
client_info->hostname[index] = c;
|
|
index++;
|
|
}
|
|
/* get build */
|
|
s->p = s->data;
|
|
if (!s_check_rem(s, 43 + 4))
|
|
{
|
|
return 1;
|
|
}
|
|
in_uint8s(s, 43);
|
|
in_uint32_le(s, client_info->build);
|
|
/* get keylayout */
|
|
s->p = s->data;
|
|
if (!s_check_rem(s, 39 + 4))
|
|
{
|
|
return 1;
|
|
}
|
|
in_uint8s(s, 39);
|
|
in_uint32_le(s, client_info->keylayout);
|
|
s->p = s->data;
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
int APP_CC
|
|
xrdp_sec_incoming(struct xrdp_sec* self)
|
|
{
|
|
struct list* items = NULL;
|
|
struct list* values = NULL;
|
|
int index = 0;
|
|
char* item = NULL;
|
|
char* value = NULL;
|
|
char key_file[256];
|
|
|
|
g_memset(key_file,0,sizeof(char)*256);
|
|
|
|
DEBUG((" in xrdp_sec_incoming"));
|
|
g_random(self->server_random, 32);
|
|
items = list_create();
|
|
items->auto_free = 1;
|
|
values = list_create();
|
|
values->auto_free = 1;
|
|
g_snprintf(key_file, 255, "%s/rsakeys.ini", XRDP_CFG_PATH);
|
|
if (file_by_name_read_section(key_file, "keys", items, values) != 0)
|
|
{
|
|
/* this is a show stopper */
|
|
g_writeln("xrdp_sec_incoming: error reading %s file", key_file);
|
|
list_delete(items);
|
|
list_delete(values);
|
|
return 1;
|
|
}
|
|
for (index = 0; index < items->count; index++)
|
|
{
|
|
item = (char*)list_get_item(items, index);
|
|
value = (char*)list_get_item(values, index);
|
|
if (g_strcasecmp(item, "pub_exp") == 0)
|
|
{
|
|
hex_str_to_bin(value, self->pub_exp, 4);
|
|
}
|
|
else if (g_strcasecmp(item, "pub_mod") == 0)
|
|
{
|
|
hex_str_to_bin(value, self->pub_mod, 64);
|
|
}
|
|
else if (g_strcasecmp(item, "pub_sig") == 0)
|
|
{
|
|
hex_str_to_bin(value, self->pub_sig, 64);
|
|
}
|
|
else if (g_strcasecmp(item, "pri_exp") == 0)
|
|
{
|
|
hex_str_to_bin(value, self->pri_exp, 64);
|
|
}
|
|
}
|
|
list_delete(items);
|
|
list_delete(values);
|
|
if (xrdp_mcs_incoming(self->mcs_layer) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
#ifdef XRDP_DEBUG
|
|
g_writeln("client mcs data received");
|
|
g_hexdump(self->client_mcs_data.data,
|
|
(int)(self->client_mcs_data.end - self->client_mcs_data.data));
|
|
g_writeln("server mcs data sent");
|
|
g_hexdump(self->server_mcs_data.data,
|
|
(int)(self->server_mcs_data.end - self->server_mcs_data.data));
|
|
#endif
|
|
DEBUG((" out xrdp_sec_incoming"));
|
|
if (xrdp_sec_in_mcs_data(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
int APP_CC
|
|
xrdp_sec_disconnect(struct xrdp_sec* self)
|
|
{
|
|
int rv;
|
|
|
|
DEBUG((" in xrdp_sec_disconnect"));
|
|
rv = xrdp_mcs_disconnect(self->mcs_layer);
|
|
DEBUG((" out xrdp_sec_disconnect"));
|
|
return rv;
|
|
}
|