/** * xrdp: A Remote Desktop Protocol server. * * Copyright (C) Jay Sorg 2004-2014 * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * secure layer */ #include "libxrdp.h" #include "log.h" #define LOG_LEVEL 1 #define LLOG(_level, _args) \ do { if (_level < LOG_LEVEL) { g_write _args ; } } while (0) #define LLOGLN(_level, _args) \ do { if (_level < LOG_LEVEL) { g_writeln _args ; } } while (0) #define LHEXDUMP(_level, _args) \ do { if (_level < LOG_LEVEL) { g_hexdump _args ; } } while (0) /* some compilers need unsigned char to avoid warnings */ static tui8 g_pad_54[40] = { 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54 }; /* some compilers need unsigned char to avoid warnings */ static tui8 g_pad_92[48] = { 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92 }; /* some compilers need unsigned char to avoid warnings */ static tui8 g_lic1[322] = { 0x80, 0x00, 0x3e, 0x01, 0x01, 0x02, 0x3e, 0x01, 0x7b, 0x3c, 0x31, 0xa6, 0xae, 0xe8, 0x74, 0xf6, 0xb4, 0xa5, 0x03, 0x90, 0xe7, 0xc2, 0xc7, 0x39, 0xba, 0x53, 0x1c, 0x30, 0x54, 0x6e, 0x90, 0x05, 0xd0, 0x05, 0xce, 0x44, 0x18, 0x91, 0x83, 0x81, 0x00, 0x00, 0x04, 0x00, 0x2c, 0x00, 0x00, 0x00, 0x4d, 0x00, 0x69, 0x00, 0x63, 0x00, 0x72, 0x00, 0x6f, 0x00, 0x73, 0x00, 0x6f, 0x00, 0x66, 0x00, 0x74, 0x00, 0x20, 0x00, 0x43, 0x00, 0x6f, 0x00, 0x72, 0x00, 0x70, 0x00, 0x6f, 0x00, 0x72, 0x00, 0x61, 0x00, 0x74, 0x00, 0x69, 0x00, 0x6f, 0x00, 0x6e, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x32, 0x00, 0x33, 0x00, 0x36, 0x00, 0x00, 0x00, 0x0d, 0x00, 0x04, 0x00, 0x01, 0x00, 0x00, 0x00, 0x03, 0x00, 0xb8, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x06, 0x00, 0x5c, 0x00, 0x52, 0x53, 0x41, 0x31, 0x48, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x3f, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0xc7, 0xc9, 0xf7, 0x8e, 0x5a, 0x38, 0xe4, 0x29, 0xc3, 0x00, 0x95, 0x2d, 0xdd, 0x4c, 0x3e, 0x50, 0x45, 0x0b, 0x0d, 0x9e, 0x2a, 0x5d, 0x18, 0x63, 0x64, 0xc4, 0x2c, 0xf7, 0x8f, 0x29, 0xd5, 0x3f, 0xc5, 0x35, 0x22, 0x34, 0xff, 0xad, 0x3a, 0xe6, 0xe3, 0x95, 0x06, 0xae, 0x55, 0x82, 0xe3, 0xc8, 0xc7, 0xb4, 0xa8, 0x47, 0xc8, 0x50, 0x71, 0x74, 0x29, 0x53, 0x89, 0x6d, 0x9c, 0xed, 0x70, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x48, 0x00, 0xa8, 0xf4, 0x31, 0xb9, 0xab, 0x4b, 0xe6, 0xb4, 0xf4, 0x39, 0x89, 0xd6, 0xb1, 0xda, 0xf6, 0x1e, 0xec, 0xb1, 0xf0, 0x54, 0x3b, 0x5e, 0x3e, 0x6a, 0x71, 0xb4, 0xf7, 0x75, 0xc8, 0x16, 0x2f, 0x24, 0x00, 0xde, 0xe9, 0x82, 0x99, 0x5f, 0x33, 0x0b, 0xa9, 0xa6, 0x94, 0xaf, 0xcb, 0x11, 0xc3, 0xf2, 0xdb, 0x09, 0x42, 0x68, 0x29, 0x56, 0x58, 0x01, 0x56, 0xdb, 0x59, 0x03, 0x69, 0xdb, 0x7d, 0x37, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x0e, 0x00, 0x0e, 0x00, 0x6d, 0x69, 0x63, 0x72, 0x6f, 0x73, 0x6f, 0x66, 0x74, 0x2e, 0x63, 0x6f, 0x6d, 0x00 }; /* some compilers need unsigned char to avoid warnings */ static tui8 g_lic2[20] = { 0x80, 0x00, 0x10, 0x00, 0xff, 0x02, 0x10, 0x00, 0x07, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x28, 0x14, 0x00, 0x00 }; /* mce */ /* some compilers need unsigned char to avoid warnings */ static tui8 g_lic3[20] = { 0x80, 0x02, 0x10, 0x00, 0xff, 0x03, 0x10, 0x00, 0x07, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0xf3, 0x99, 0x00, 0x00 }; static const tui8 g_fips_reverse_table[256] = { 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff }; static const tui8 g_fips_oddparity_table[256] = { 0x01, 0x01, 0x02, 0x02, 0x04, 0x04, 0x07, 0x07, 0x08, 0x08, 0x0b, 0x0b, 0x0d, 0x0d, 0x0e, 0x0e, 0x10, 0x10, 0x13, 0x13, 0x15, 0x15, 0x16, 0x16, 0x19, 0x19, 0x1a, 0x1a, 0x1c, 0x1c, 0x1f, 0x1f, 0x20, 0x20, 0x23, 0x23, 0x25, 0x25, 0x26, 0x26, 0x29, 0x29, 0x2a, 0x2a, 0x2c, 0x2c, 0x2f, 0x2f, 0x31, 0x31, 0x32, 0x32, 0x34, 0x34, 0x37, 0x37, 0x38, 0x38, 0x3b, 0x3b, 0x3d, 0x3d, 0x3e, 0x3e, 0x40, 0x40, 0x43, 0x43, 0x45, 0x45, 0x46, 0x46, 0x49, 0x49, 0x4a, 0x4a, 0x4c, 0x4c, 0x4f, 0x4f, 0x51, 0x51, 0x52, 0x52, 0x54, 0x54, 0x57, 0x57, 0x58, 0x58, 0x5b, 0x5b, 0x5d, 0x5d, 0x5e, 0x5e, 0x61, 0x61, 0x62, 0x62, 0x64, 0x64, 0x67, 0x67, 0x68, 0x68, 0x6b, 0x6b, 0x6d, 0x6d, 0x6e, 0x6e, 0x70, 0x70, 0x73, 0x73, 0x75, 0x75, 0x76, 0x76, 0x79, 0x79, 0x7a, 0x7a, 0x7c, 0x7c, 0x7f, 0x7f, 0x80, 0x80, 0x83, 0x83, 0x85, 0x85, 0x86, 0x86, 0x89, 0x89, 0x8a, 0x8a, 0x8c, 0x8c, 0x8f, 0x8f, 0x91, 0x91, 0x92, 0x92, 0x94, 0x94, 0x97, 0x97, 0x98, 0x98, 0x9b, 0x9b, 0x9d, 0x9d, 0x9e, 0x9e, 0xa1, 0xa1, 0xa2, 0xa2, 0xa4, 0xa4, 0xa7, 0xa7, 0xa8, 0xa8, 0xab, 0xab, 0xad, 0xad, 0xae, 0xae, 0xb0, 0xb0, 0xb3, 0xb3, 0xb5, 0xb5, 0xb6, 0xb6, 0xb9, 0xb9, 0xba, 0xba, 0xbc, 0xbc, 0xbf, 0xbf, 0xc1, 0xc1, 0xc2, 0xc2, 0xc4, 0xc4, 0xc7, 0xc7, 0xc8, 0xc8, 0xcb, 0xcb, 0xcd, 0xcd, 0xce, 0xce, 0xd0, 0xd0, 0xd3, 0xd3, 0xd5, 0xd5, 0xd6, 0xd6, 0xd9, 0xd9, 0xda, 0xda, 0xdc, 0xdc, 0xdf, 0xdf, 0xe0, 0xe0, 0xe3, 0xe3, 0xe5, 0xe5, 0xe6, 0xe6, 0xe9, 0xe9, 0xea, 0xea, 0xec, 0xec, 0xef, 0xef, 0xf1, 0xf1, 0xf2, 0xf2, 0xf4, 0xf4, 0xf7, 0xf7, 0xf8, 0xf8, 0xfb, 0xfb, 0xfd, 0xfd, 0xfe, 0xfe }; static const tui8 g_fips_ivec[8] = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; static int is_security_header_present = 1; /* next packet should contain security header? */ /*****************************************************************************/ static void APP_CC hex_str_to_bin(char *in, char *out, int out_len) { int in_index; int in_len; int out_index; int val; char hex[16]; in_len = g_strlen(in); out_index = 0; in_index = 0; while (in_index <= (in_len - 4)) { if ((in[in_index] == '0') && (in[in_index + 1] == 'x')) { hex[0] = in[in_index + 2]; hex[1] = in[in_index + 3]; hex[2] = 0; if (out_index < out_len) { val = g_htoi(hex); out[out_index] = val; } out_index++; } in_index++; } } /*****************************************************************************/ static void APP_CC xrdp_load_keyboard_layout(struct xrdp_client_info *client_info) { int fd; int index = 0; int bytes; struct list *names = (struct list *)NULL; struct list *items = (struct list *)NULL; struct list *values = (struct list *)NULL; char *item = (char *)NULL; char *value = (char *)NULL; char *q = (char *)NULL; char keyboard_cfg_file[256] = { 0 }; char rdp_layout[256] = { 0 }; LLOGLN(0, ("xrdp_load_keyboard_layout:")); /* infer model/variant */ /* TODO specify different X11 keyboard models/variants */ g_memset(client_info->model, 0, sizeof(client_info->model)); g_memset(client_info->variant, 0, sizeof(client_info->variant)); g_strncpy(client_info->layout, "us", sizeof(client_info->layout) - 1); if (client_info->keyboard_subtype == 3) { /* macintosh keyboard */ bytes = sizeof(client_info->variant); g_strncpy(client_info->variant, "mac", bytes - 1); } else if (client_info->keyboard_subtype == 0) { /* default - standard subtype */ client_info->keyboard_subtype = 1; } g_snprintf(keyboard_cfg_file, 255, "%s/xrdp_keyboard.ini", XRDP_CFG_PATH); LLOGLN(10, ("keyboard_cfg_file %s", keyboard_cfg_file)); fd = g_file_open(keyboard_cfg_file); if (fd > 0) { int section_found = -1; char section_rdp_layouts[256] = { 0 }; char section_layouts_map[256] = { 0 }; names = list_create(); names->auto_free = 1; items = list_create(); items->auto_free = 1; values = list_create(); values->auto_free = 1; file_read_sections(fd, names); for (index = 0; index < names->count; index++) { q = (char *)list_get_item(names, index); if (g_strncasecmp("default", q, 8) != 0) { int i; file_read_section(fd, q, items, values); for (i = 0; i < items->count; i++) { item = (char *)list_get_item(items, i); value = (char *)list_get_item(values, i); LLOGLN(10, ("xrdp_load_keyboard_layout: item %s value %s", item, value)); if (g_strcasecmp(item, "keyboard_type") == 0) { int v = g_atoi(value); if (v == client_info->keyboard_type) { section_found = index; } } else if (g_strcasecmp(item, "keyboard_subtype") == 0) { int v = g_atoi(value); if (v != client_info->keyboard_subtype && section_found == index) { section_found = -1; break; } } else if (g_strcasecmp(item, "rdp_layouts") == 0) { if (section_found != -1 && section_found == index) { g_strncpy(section_rdp_layouts, value, 255); } } else if (g_strcasecmp(item, "layouts_map") == 0) { if (section_found != -1 && section_found == index) { g_strncpy(section_layouts_map, value, 255); } } else if (g_strcasecmp(item, "model") == 0) { if (section_found != -1 && section_found == index) { bytes = sizeof(client_info->model); g_memset(client_info->model, 0, bytes); g_strncpy(client_info->model, value, bytes - 1); } } else if (g_strcasecmp(item, "variant") == 0) { if (section_found != -1 && section_found == index) { bytes = sizeof(client_info->variant); g_memset(client_info->variant, 0, bytes); g_strncpy(client_info->variant, value, bytes - 1); } } else { /* * mixing items from different sections will result in * skipping over current section. */ LLOGLN(10, ("xrdp_load_keyboard_layout: skipping " "configuration item - %s, continuing to next " "section", item)); break; } } list_clear(items); list_clear(values); } } if (section_found == -1) { g_memset(section_rdp_layouts, 0, sizeof(char) * 256); g_memset(section_layouts_map, 0, sizeof(char) * 256); // read default section file_read_section(fd, "default", items, values); 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, "rdp_layouts") == 0) { g_strncpy(section_rdp_layouts, value, 255); } else if (g_strcasecmp(item, "layouts_map") == 0) { g_strncpy(section_layouts_map, value, 255); } } list_clear(items); list_clear(values); } /* load the map */ file_read_section(fd, section_rdp_layouts, items, values); for (index = 0; index < items->count; index++) { int rdp_layout_id; item = (char *)list_get_item(items, index); value = (char *)list_get_item(values, index); rdp_layout_id = g_htoi(value); if (rdp_layout_id == client_info->keylayout) { g_strncpy(rdp_layout, item, 255); break; } } list_clear(items); list_clear(values); file_read_section(fd, section_layouts_map, items, values); 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, rdp_layout) == 0) { bytes = sizeof(client_info->layout); g_strncpy(client_info->layout, value, bytes - 1); break; } } list_delete(names); list_delete(items); list_delete(values); LLOGLN(0, ("xrdp_load_keyboard_layout: model [%s] variant [%s] " "layout [%s]", client_info->model, client_info->variant, client_info->layout)); g_file_close(fd); } else { LLOGLN(0, ("xrdp_load_keyboard_layout: error opening %d", keyboard_cfg_file)); } } /*****************************************************************************/ struct xrdp_sec *APP_CC xrdp_sec_create(struct xrdp_rdp *owner, struct trans *trans) { struct xrdp_sec *self; DEBUG((" in xrdp_sec_create")); self = (struct xrdp_sec *) g_malloc(sizeof(struct xrdp_sec), 1); self->rdp_layer = owner; self->crypt_method = CRYPT_METHOD_NONE; /* set later */ self->crypt_level = CRYPT_LEVEL_NONE; self->mcs_layer = xrdp_mcs_create(self, trans, &(self->client_mcs_data), &(self->server_mcs_data)); self->fastpath_layer = xrdp_fastpath_create(self, trans); self->chan_layer = xrdp_channel_create(self, self->mcs_layer); DEBUG((" out xrdp_sec_create")); return self; } /*****************************************************************************/ void APP_CC xrdp_sec_delete(struct xrdp_sec *self) { if (self == 0) { g_writeln("xrdp_sec_delete: indata is null"); return; } xrdp_channel_delete(self->chan_layer); xrdp_mcs_delete(self->mcs_layer); xrdp_fastpath_delete(self->fastpath_layer); ssl_rc4_info_delete(self->decrypt_rc4_info); /* TODO clear all data */ ssl_rc4_info_delete(self->encrypt_rc4_info); /* TODO clear all data */ ssl_des3_info_delete(self->decrypt_fips_info); ssl_des3_info_delete(self->encrypt_fips_info); ssl_hmac_info_delete(self->sign_fips_info); g_free(self->client_mcs_data.data); g_free(self->server_mcs_data.data); /* Crypto information must always be cleared */ g_memset(self, 0, sizeof(struct xrdp_sec)); g_free(self); } /*****************************************************************************/ /* returns error */ int APP_CC xrdp_sec_init(struct xrdp_sec *self, struct stream *s) { if (xrdp_mcs_init(self->mcs_layer, s) != 0) { return 1; } if (self->crypt_level == CRYPT_LEVEL_FIPS) { s_push_layer(s, sec_hdr, 4 + 4 + 8); } else if (self->crypt_level > CRYPT_LEVEL_LOW) { s_push_layer(s, sec_hdr, 4 + 8); } else { // s_push_layer(s, sec_hdr, 4); } return 0; } /*****************************************************************************/ /* Reduce key entropy from 64 to 40 bits */ static void APP_CC xrdp_sec_make_40bit(char *key) { key[0] = 0xd1; key[1] = 0x26; key[2] = 0x9e; } /*****************************************************************************/ /* returns error */ /* update an encryption key */ static int APP_CC xrdp_sec_update(char *key, char *update_key, int key_len) { char shasig[20]; void *sha1_info; void *md5_info; void *rc4_info; sha1_info = ssl_sha1_info_create(); md5_info = ssl_md5_info_create(); rc4_info = ssl_rc4_info_create(); ssl_sha1_clear(sha1_info); ssl_sha1_transform(sha1_info, update_key, key_len); ssl_sha1_transform(sha1_info, (char *)g_pad_54, 40); ssl_sha1_transform(sha1_info, key, key_len); ssl_sha1_complete(sha1_info, shasig); ssl_md5_clear(md5_info); ssl_md5_transform(md5_info, update_key, key_len); ssl_md5_transform(md5_info, (char *)g_pad_92, 48); ssl_md5_transform(md5_info, shasig, 20); ssl_md5_complete(md5_info, key); ssl_rc4_set_key(rc4_info, key, key_len); ssl_rc4_crypt(rc4_info, key, key_len); if (key_len == 8) { xrdp_sec_make_40bit(key); } ssl_sha1_info_delete(sha1_info); ssl_md5_info_delete(md5_info); ssl_rc4_info_delete(rc4_info); return 0; } /*****************************************************************************/ static void APP_CC xrdp_sec_fips_decrypt(struct xrdp_sec *self, char *data, int len) { LLOGLN(10, ("xrdp_sec_fips_decrypt:")); ssl_des3_decrypt(self->decrypt_fips_info, len, data, data); self->decrypt_use_count++; } /*****************************************************************************/ static void APP_CC xrdp_sec_decrypt(struct xrdp_sec *self, char *data, int len) { LLOGLN(10, ("xrdp_sec_decrypt:")); if (self->decrypt_use_count == 4096) { xrdp_sec_update(self->decrypt_key, self->decrypt_update_key, self->rc4_key_len); ssl_rc4_set_key(self->decrypt_rc4_info, self->decrypt_key, self->rc4_key_len); self->decrypt_use_count = 0; } ssl_rc4_crypt(self->decrypt_rc4_info, data, len); self->decrypt_use_count++; } /*****************************************************************************/ static void APP_CC xrdp_sec_fips_encrypt(struct xrdp_sec *self, char *data, int len) { LLOGLN(10, ("xrdp_sec_fips_encrypt:")); ssl_des3_encrypt(self->encrypt_fips_info, len, data, data); self->encrypt_use_count++; } /*****************************************************************************/ static void APP_CC xrdp_sec_encrypt(struct xrdp_sec *self, char *data, int len) { LLOGLN(10, ("xrdp_sec_encrypt:")); if (self->encrypt_use_count == 4096) { xrdp_sec_update(self->encrypt_key, self->encrypt_update_key, self->rc4_key_len); ssl_rc4_set_key(self->encrypt_rc4_info, self->encrypt_key, self->rc4_key_len); self->encrypt_use_count = 0; } ssl_rc4_crypt(self->encrypt_rc4_info, data, len); self->encrypt_use_count++; } /*****************************************************************************/ static int APP_CC unicode_in(struct stream *s, int uni_len, char *dst, int dst_len) { int dst_index; int src_index; dst_index = 0; src_index = 0; while (src_index < uni_len) { if (dst_index >= dst_len || src_index > 512) { break; } if (!s_check_rem(s, 2)) { return 1; } in_uint8(s, dst[dst_index]); in_uint8s(s, 1); dst_index++; src_index += 2; } if (!s_check_rem(s, 2)) { return 1; } in_uint8s(s, 2); return 0; } /*****************************************************************************/ /* returns error */ static int APP_CC xrdp_sec_process_logon_info(struct xrdp_sec *self, struct stream *s) { int flags = 0; int len_domain = 0; int len_user = 0; int len_password = 0; int len_program = 0; int len_directory = 0; int len_ip = 0; int len_dll = 0; int tzone = 0; char tmpdata[256]; /* initialize (zero out) local variables */ g_memset(tmpdata, 0, sizeof(char) * 256); if (!s_check_rem(s, 8)) { return 1; } in_uint8s(s, 4); in_uint32_le(s, flags); DEBUG(("in xrdp_sec_process_logon_info flags $%x", flags)); /* this is the first test that the decrypt is working */ if ((flags & RDP_LOGON_NORMAL) != RDP_LOGON_NORMAL) /* 0x33 */ { /* must be or error */ DEBUG(("xrdp_sec_process_logon_info: flags wrong, major error")); LLOGLN(0, ("xrdp_sec_process_logon_info: flags wrong, likely decrypt " "not working")); return 1; } if (flags & RDP_LOGON_LEAVE_AUDIO) { self->rdp_layer->client_info.sound_code = 1; DEBUG(("flag RDP_LOGON_LEAVE_AUDIO found")); } if ((flags & RDP_LOGON_AUTO) && (!self->rdp_layer->client_info.is_mce)) /* todo, for now not allowing autologon and mce both */ { self->rdp_layer->client_info.rdp_autologin = 1; DEBUG(("flag RDP_LOGON_AUTO found")); } if (flags & RDP_COMPRESSION) { DEBUG(("flag RDP_COMPRESSION found")); if (self->rdp_layer->client_info.use_bulk_comp) { DEBUG(("flag RDP_COMPRESSION set")); self->rdp_layer->client_info.rdp_compression = 1; } else { DEBUG(("flag RDP_COMPRESSION not set")); } } if (!s_check_rem(s, 2)) { return 1; } in_uint16_le(s, len_domain); if (len_domain > 511) { DEBUG(("ERROR [xrdp_sec_process_logon_info()]: len_domain > 511")); return 1; } if (!s_check_rem(s, 2)) { return 1; } in_uint16_le(s, len_user); /* * Microsoft's itap client running on Mac OS/Android * always sends autologon credentials, even when user has not * configured any */ if (len_user == 0) { self->rdp_layer->client_info.rdp_autologin = 0; } if (len_user > 511) { DEBUG(("ERROR [xrdp_sec_process_logon_info()]: len_user > 511")); return 1; } if (!s_check_rem(s, 2)) { return 1; } in_uint16_le(s, len_password); if (len_password > 511) { DEBUG(("ERROR [xrdp_sec_process_logon_info()]: len_password > 511")); return 1; } if (!s_check_rem(s, 2)) { return 1; } in_uint16_le(s, len_program); if (len_program > 511) { DEBUG(("ERROR [xrdp_sec_process_logon_info()]: len_program > 511")); return 1; } if (!s_check_rem(s, 2)) { return 1; } in_uint16_le(s, len_directory); if (len_directory > 511) { DEBUG(("ERROR [xrdp_sec_process_logon_info()]: len_directory > 511")); return 1; } if (unicode_in(s, len_domain, self->rdp_layer->client_info.domain, 255) != 0) { return 1; } DEBUG(("domain %s", self->rdp_layer->client_info.domain)); if (unicode_in(s, len_user, self->rdp_layer->client_info.username, 255) != 0) { return 1; } DEBUG(("username %s", self->rdp_layer->client_info.username)); if (flags & RDP_LOGON_AUTO) { if (unicode_in(s, len_password, self->rdp_layer->client_info.password, 255) != 0) { return 1; } DEBUG(("flag RDP_LOGON_AUTO found")); } else { if (!s_check_rem(s, len_password + 2)) { return 1; } in_uint8s(s, len_password + 2); if (self->rdp_layer->client_info.require_credentials) { g_writeln("xrdp_sec_process_logon_info: credentials on cmd line is mandatory"); return 1; /* credentials on cmd line is mandatory */ } } if (unicode_in(s, len_program, self->rdp_layer->client_info.program, 255) != 0) { return 1; } DEBUG(("program %s", self->rdp_layer->client_info.program)); if (unicode_in(s, len_directory, self->rdp_layer->client_info.directory, 255) != 0) { return 1; } DEBUG(("directory %s", self->rdp_layer->client_info.directory)); if (flags & RDP_LOGON_BLOB) { if (!s_check_rem(s, 4)) { return 1; } in_uint8s(s, 2); /* unknown */ in_uint16_le(s, len_ip); if (unicode_in(s, len_ip - 2, tmpdata, 255) != 0) { return 1; } if (!s_check_rem(s, 2)) { return 1; } in_uint16_le(s, len_dll); if (unicode_in(s, len_dll - 2, tmpdata, 255) != 0) { return 1; } if (!s_check_rem(s, 4 + 62 + 22 + 62 + 26 + 4)) { return 1; } in_uint32_le(s, tzone); /* len of timezone */ in_uint8s(s, 62); /* skip */ in_uint8s(s, 22); /* skip misc. */ in_uint8s(s, 62); /* skip */ 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; LLOGLN(10, ("xrdp_sec_send_lic_initial:")); 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(struct xrdp_sec *self, char *out, char *in, int in_bytes, char *mod, char *exp) { ssl_mod_exp(out, self->rsa_key_bytes, in, in_bytes, mod, self->rsa_key_bytes, exp, self->rsa_key_bytes); } /*****************************************************************************/ 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 fips_expand_key_bits(const char *in, char *out) { tui8 buf[32]; tui8 c; int i; int b; int p; int r; /* reverse every byte in the key */ for (i = 0; i < 21; i++) { c = in[i]; buf[i] = g_fips_reverse_table[c]; } /* insert a zero-bit after every 7th bit */ for (i = 0, b = 0; i < 24; i++, b += 7) { p = b / 8; r = b % 8; if (r == 0) { out[i] = buf[p] & 0xfe; } else { /* c is accumulator */ c = buf[p] << r; c |= buf[p + 1] >> (8 - r); out[i] = c & 0xfe; } } /* reverse every byte */ /* alter lsb so the byte has odd parity */ for (i = 0; i < 24; i++) { c = out[i]; c = g_fips_reverse_table[c]; out[i] = g_fips_oddparity_table[c]; } } /****************************************************************************/ static void APP_CC xrdp_sec_fips_establish_keys(struct xrdp_sec *self) { char server_encrypt_key[32]; char server_decrypt_key[32]; const char *fips_ivec; void *sha1; LLOGLN(0, ("xrdp_sec_fips_establish_keys:")); sha1 = ssl_sha1_info_create(); ssl_sha1_clear(sha1); ssl_sha1_transform(sha1, self->client_random + 16, 16); ssl_sha1_transform(sha1, self->server_random + 16, 16); ssl_sha1_complete(sha1, server_decrypt_key); server_decrypt_key[20] = server_decrypt_key[0]; fips_expand_key_bits(server_decrypt_key, self->fips_decrypt_key); ssl_sha1_info_delete(sha1); sha1 = ssl_sha1_info_create(); ssl_sha1_clear(sha1); ssl_sha1_transform(sha1, self->client_random, 16); ssl_sha1_transform(sha1, self->server_random, 16); ssl_sha1_complete(sha1, server_encrypt_key); server_encrypt_key[20] = server_encrypt_key[0]; fips_expand_key_bits(server_encrypt_key, self->fips_encrypt_key); ssl_sha1_info_delete(sha1); sha1 = ssl_sha1_info_create(); ssl_sha1_clear(sha1); ssl_sha1_transform(sha1, server_encrypt_key, 20); ssl_sha1_transform(sha1, server_decrypt_key, 20); ssl_sha1_complete(sha1, self->fips_sign_key); ssl_sha1_info_delete(sha1); fips_ivec = (const char *) g_fips_ivec; self->encrypt_fips_info = ssl_des3_encrypt_info_create(self->fips_encrypt_key, fips_ivec); self->decrypt_fips_info = ssl_des3_decrypt_info_create(self->fips_decrypt_key, fips_ivec); self->sign_fips_info = ssl_hmac_info_create(); } /****************************************************************************/ static void APP_CC xrdp_sec_establish_keys(struct xrdp_sec *self) { char session_key[48]; char temp_hash[48]; char input[48]; LLOGLN(0, ("xrdp_sec_establish_keys:")); 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->crypt_method == CRYPT_METHOD_40BIT) { 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_fastpath(struct xrdp_sec *self, struct stream *s) { int ver; int len; int pad; LLOGLN(10, ("xrdp_sec_recv_fastpath:")); if (xrdp_fastpath_recv(self->fastpath_layer, s) != 0) { return 1; } if (self->fastpath_layer->secFlags & FASTPATH_INPUT_ENCRYPTED) { if (self->crypt_level == CRYPT_LEVEL_FIPS) { if (!s_check_rem(s, 12)) { return 1; } in_uint16_le(s, len); in_uint8(s, ver); /* length (2 bytes) */ if (len != 0x10) /* length MUST set to 0x10 */ { return 1; } in_uint8(s, pad); LLOGLN(10, ("xrdp_sec_recv_fastpath: len %d ver %d pad %d", len, ver, pad)); in_uint8s(s, 8); /* dataSignature (8 bytes), skip for now */ LLOGLN(10, ("xrdp_sec_recv_fastpath: data len %d", (int)(s->end - s->p))); xrdp_sec_fips_decrypt(self, s->p, (int)(s->end - s->p)); s->end -= pad; } else { if (!s_check_rem(s, 8)) { return 1; } in_uint8s(s, 8); /* dataSignature (8 bytes), skip for now */ xrdp_sec_decrypt(self, s->p, (int)(s->end - s->p)); } } if (self->fastpath_layer->numEvents == 0) { /** * If numberEvents is not provided in fpInputHeader, it will be provided * as one additional byte here. */ if (!s_check_rem(s, 8)) { return 1; } in_uint8(s, self->fastpath_layer->numEvents); /* numEvents (1 byte) (optional) */ } return 0; } /*****************************************************************************/ /* returns error */ int APP_CC xrdp_sec_recv(struct xrdp_sec *self, struct stream *s, int *chan) { int flags; int len; int ver; int pad; DEBUG((" in xrdp_sec_recv")); if (xrdp_mcs_recv(self->mcs_layer, s, chan) != 0) { DEBUG((" out xrdp_sec_recv : error")); g_writeln("xrdp_sec_recv: xrdp_mcs_recv failed"); return 1; } if (!s_check_rem(s, 4)) { return 1; } if (!is_security_header_present) { return 0; } in_uint32_le(s, flags); DEBUG((" in xrdp_sec_recv flags $%x", flags)); if (flags & SEC_ENCRYPT) /* 0x08 */ { if (self->crypt_level == CRYPT_LEVEL_FIPS) { if (!s_check_rem(s, 12)) { return 1; } in_uint16_le(s, len); in_uint8(s, ver); if ((len != 16) || (ver != 1)) { return 1; } in_uint8(s, pad); LLOGLN(10, ("xrdp_sec_recv: len %d ver %d pad %d", len, ver, pad)); in_uint8s(s, 8); /* signature(8) */ LLOGLN(10, ("xrdp_sec_recv: data len %d", (int)(s->end - s->p))); xrdp_sec_fips_decrypt(self, s->p, (int)(s->end - s->p)); s->end -= pad; } else if (self->crypt_level > CRYPT_LEVEL_NONE) { if (!s_check_rem(s, 8)) { return 1; } in_uint8s(s, 8); /* signature(8) */ xrdp_sec_decrypt(self, s->p, (int)(s->end - s->p)); } } if (flags & SEC_CLIENT_RANDOM) /* 0x01 */ { if (!s_check_rem(s, 4)) { return 1; } in_uint32_le(s, len); /* 512, 2048 bit */ if ((len != 64 + 8) && (len != 256 + 8)) { return 1; } if (!s_check_rem(s, len - 8)) { return 1; } in_uint8a(s, self->client_crypt_random, len - 8); xrdp_sec_rsa_op(self, self->client_random, self->client_crypt_random, len - 8, self->pub_mod, self->pri_exp); LLOGLN(10, ("xrdp_sec_recv: client random - len %d", len)); LHEXDUMP(10, (self->client_random, 256)); LHEXDUMP(10, (self->client_crypt_random, len - 8)); if (self->crypt_level == CRYPT_LEVEL_FIPS) { xrdp_sec_fips_establish_keys(self); } else if (self->crypt_method != CRYPT_METHOD_NONE) { 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; } if (self->crypt_level == CRYPT_LEVEL_NONE && self->crypt_method == CRYPT_METHOD_NONE) { is_security_header_present = 0; /* in tls mode, no more security header from now on */ } 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_fips_sign(struct xrdp_sec *self, char *out, int out_len, char *data, int data_len) { char buf[20]; char lenhdr[4]; buf_out_uint32(lenhdr, self->encrypt_use_count); ssl_hmac_sha1_init(self->sign_fips_info, self->fips_sign_key, 20); ssl_hmac_transform(self->sign_fips_info, data, data_len); ssl_hmac_transform(self->sign_fips_info, lenhdr, 4); ssl_hmac_complete(self->sign_fips_info, buf, 20); g_memcpy(out, buf, out_len); } /*****************************************************************************/ /* 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; int pad; LLOGLN(10, ("xrdp_sec_send:")); DEBUG((" in xrdp_sec_send")); s_pop_layer(s, sec_hdr); if (self->crypt_level == CRYPT_LEVEL_FIPS) { LLOGLN(10, ("xrdp_sec_send: fips")); out_uint32_le(s, SEC_ENCRYPT); datalen = (int)((s->end - s->p) - 12); out_uint16_le(s, 16); /* crypto header size */ out_uint8(s, 1); /* fips version */ pad = (8 - (datalen % 8)) & 7; g_memset(s->end, 0, pad); s->end += pad; out_uint8(s, pad); /* fips pad */ xrdp_sec_fips_sign(self, s->p, 8, s->p + 8, datalen); xrdp_sec_fips_encrypt(self, s->p + 8, datalen + pad); } else if (self->crypt_level > CRYPT_LEVEL_LOW) { 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; } /*****************************************************************************/ /* returns the fastpath sec byte count */ int APP_CC xrdp_sec_get_fastpath_bytes(struct xrdp_sec *self) { if (self->crypt_level == CRYPT_LEVEL_FIPS) { return 3 + 4 + 8; } else if (self->crypt_level > CRYPT_LEVEL_LOW) { return 3 + 8; } return 3; } /*****************************************************************************/ /* returns error */ int APP_CC xrdp_sec_init_fastpath(struct xrdp_sec *self, struct stream *s) { if (xrdp_fastpath_init(self->fastpath_layer, s) != 0) { return 1; } if (self->crypt_level == CRYPT_LEVEL_FIPS) { s_push_layer(s, sec_hdr, 3 + 4 + 8); } else if (self->crypt_level > CRYPT_LEVEL_LOW) { s_push_layer(s, sec_hdr, 3 + 8); } else { s_push_layer(s, sec_hdr, 3); } return 0; } /*****************************************************************************/ /* returns error */ /* 2.2.9.1.2 Server Fast-Path Update PDU (TS_FP_UPDATE_PDU) * http://msdn.microsoft.com/en-us/library/cc240621.aspx */ int APP_CC xrdp_sec_send_fastpath(struct xrdp_sec *self, struct stream *s) { int secFlags; int fpOutputHeader; int datalen; int pdulen; int pad; int error; char save[8]; LLOGLN(10, ("xrdp_sec_send_fastpath:")); error = 0; s_pop_layer(s, sec_hdr); if (self->crypt_level == CRYPT_LEVEL_FIPS) { LLOGLN(10, ("xrdp_sec_send_fastpath: fips")); pdulen = (int)(s->end - s->p); datalen = pdulen - 15; pad = (8 - (datalen % 8)) & 7; secFlags = 0x2; fpOutputHeader = secFlags << 6; out_uint8(s, fpOutputHeader); pdulen += pad; pdulen |= 0x8000; out_uint16_be(s, pdulen); out_uint16_le(s, 16); /* crypto header size */ out_uint8(s, 1); /* fips version */ s->end += pad; out_uint8(s, pad); /* fips pad */ xrdp_sec_fips_sign(self, s->p, 8, s->p + 8, datalen); g_memcpy(save, s->p + 8 + datalen, pad); g_memset(s->p + 8 + datalen, 0, pad); xrdp_sec_fips_encrypt(self, s->p + 8, datalen + pad); error = xrdp_fastpath_send(self->fastpath_layer, s); g_memcpy(s->p + 8 + datalen, save, pad); } else if (self->crypt_level > CRYPT_LEVEL_LOW) { LLOGLN(10, ("xrdp_sec_send_fastpath: crypt")); pdulen = (int)(s->end - s->p); datalen = pdulen - 11; secFlags = 0x2; fpOutputHeader = secFlags << 6; out_uint8(s, fpOutputHeader); pdulen |= 0x8000; out_uint16_be(s, pdulen); xrdp_sec_sign(self, s->p, 8, s->p + 8, datalen); xrdp_sec_encrypt(self, s->p + 8, datalen); error = xrdp_fastpath_send(self->fastpath_layer, s); } else { LLOGLN(10, ("xrdp_sec_send_fastpath: no crypt")); pdulen = (int)(s->end - s->p); LLOGLN(10, ("xrdp_sec_send_fastpath: pdulen %d", pdulen)); secFlags = 0x0; fpOutputHeader = secFlags << 6; out_uint8(s, fpOutputHeader); pdulen |= 0x8000; out_uint16_be(s, pdulen); error = xrdp_fastpath_send(self->fastpath_layer, s); } if (error != 0) { return 1; } return 0; } /*****************************************************************************/ /* http://msdn.microsoft.com/en-us/library/cc240510.aspx 2.2.1.3.2 Client Core Data (TS_UD_CS_CORE) */ static int APP_CC xrdp_sec_process_mcs_data_CS_CORE(struct xrdp_sec* self, struct stream* s) { int colorDepth; int postBeta2ColorDepth; int highColorDepth; int supportedColorDepths; int earlyCapabilityFlags; in_uint8s(s, 4); /* version */ in_uint16_le(s, self->rdp_layer->client_info.width); in_uint16_le(s, self->rdp_layer->client_info.height); in_uint16_le(s, colorDepth); g_writeln("colorDepth 0x%4.4x (0xca00 4bpp 0xca01 8bpp)", colorDepth); switch (colorDepth) { case 0xca00: /* RNS_UD_COLOR_4BPP */ self->rdp_layer->client_info.bpp = 4; break; case 0xca01: /* RNS_UD_COLOR_8BPP */ self->rdp_layer->client_info.bpp = 8; break; } in_uint8s(s, 2); /* SASSequence */ in_uint8s(s, 4); /* keyboardLayout */ in_uint8s(s, 4); /* clientBuild */ in_uint8s(s, 32); /* clientName */ in_uint8s(s, 4); /* keyboardType */ in_uint8s(s, 4); /* keyboardSubType */ in_uint8s(s, 4); /* keyboardFunctionKey */ in_uint8s(s, 64); /* imeFileName */ in_uint16_le(s, postBeta2ColorDepth); g_writeln("postBeta2ColorDepth 0x%4.4x (0xca00 4bpp 0xca01 8bpp " "0xca02 15bpp 0xca03 16bpp 0xca04 24bpp)", postBeta2ColorDepth); switch (postBeta2ColorDepth) { case 0xca00: /* RNS_UD_COLOR_4BPP */ self->rdp_layer->client_info.bpp = 4; break; case 0xca01: /* RNS_UD_COLOR_8BPP */ self->rdp_layer->client_info.bpp = 8; break; case 0xca02: /* RNS_UD_COLOR_16BPP_555 */ self->rdp_layer->client_info.bpp = 15; break; case 0xca03: /* RNS_UD_COLOR_16BPP_565 */ self->rdp_layer->client_info.bpp = 16; break; case 0xca04: /* RNS_UD_COLOR_24BPP */ self->rdp_layer->client_info.bpp = 24; break; } if (!s_check_rem(s, 2)) { return 0; } in_uint8s(s, 2); /* clientProductId */ if (!s_check_rem(s, 4)) { return 0; } in_uint8s(s, 4); /* serialNumber */ if (!s_check_rem(s, 2)) { return 0; } in_uint16_le(s, highColorDepth); g_writeln("highColorDepth 0x%4.4x (0x0004 4bpp 0x0008 8bpp 0x000f 15bpp " "0x0010 16 bpp 0x0018 24bpp)", highColorDepth); self->rdp_layer->client_info.bpp = highColorDepth; if (!s_check_rem(s, 2)) { return 0; } in_uint16_le(s, supportedColorDepths); g_writeln("supportedColorDepths 0x%4.4x (0x0001 24bpp 0x0002 16bpp " "0x0004 15bpp 0x0008 32bpp)", supportedColorDepths); if (!s_check_rem(s, 2)) { return 0; } in_uint16_le(s, earlyCapabilityFlags); self->rdp_layer->client_info.mcs_early_capability_flags = earlyCapabilityFlags; g_writeln("earlyCapabilityFlags 0x%4.4x (0x0002 want32)", earlyCapabilityFlags); if ((earlyCapabilityFlags & 0x0002) && (supportedColorDepths & 0x0008)) { self->rdp_layer->client_info.bpp = 32; } if (!s_check_rem(s, 64)) { return 0; } in_uint8s(s, 64); /* clientDigProductId */ if (!s_check_rem(s, 1)) { return 0; } in_uint8(s, self->rdp_layer->client_info.mcs_connection_type); /* connectionType */ g_writeln("got client client connection type 0x%8.8x", self->rdp_layer->client_info.mcs_connection_type); if (!s_check_rem(s, 1)) { return 0; } in_uint8s(s, 1); /* pad1octet */ if (!s_check_rem(s, 4)) { return 0; } in_uint8s(s, 4); /* serverSelectedProtocol */ if (!s_check_rem(s, 4)) { return 0; } in_uint8s(s, 4); /* desktopPhysicalWidth */ if (!s_check_rem(s, 4)) { return 0; } in_uint8s(s, 4); /* desktopPhysicalHeight */ if (!s_check_rem(s, 2)) { return 0; } in_uint8s(s, 2); /* reserved */ return 0; } /*****************************************************************************/ static int APP_CC xrdp_sec_process_mcs_data_CS_SECURITY(struct xrdp_sec *self, struct stream* s) { int crypt_method; int found; g_writeln("xrdp_sec_process_mcs_data_CS_SECURITY:"); in_uint32_le(s, crypt_method); if (crypt_method & CRYPT_METHOD_40BIT) { g_writeln(" client supports 40 bit encryption"); } if (crypt_method & CRYPT_METHOD_128BIT) { g_writeln(" client supports 128 bit encryption"); } if (crypt_method & CRYPT_METHOD_56BIT) { g_writeln(" client supports 56 bit encryption"); } if (crypt_method & CRYPT_METHOD_FIPS) { g_writeln(" client supports fips encryption"); } found = 0; if ((found == 0) && (self->crypt_method & CRYPT_METHOD_FIPS) && (self->crypt_level == CRYPT_LEVEL_FIPS)) { if (crypt_method & CRYPT_METHOD_FIPS) { g_writeln(" client and server support fips, using fips"); self->crypt_method = CRYPT_METHOD_FIPS; self->crypt_level = CRYPT_LEVEL_FIPS; found = 1; } } if ((found == 0) && (self->crypt_method & CRYPT_METHOD_128BIT) && (self->crypt_level == CRYPT_LEVEL_HIGH)) { if (crypt_method & CRYPT_METHOD_128BIT) { g_writeln(" client and server support high crypt, using " "high crypt"); self->crypt_method = CRYPT_METHOD_128BIT; self->crypt_level = CRYPT_LEVEL_HIGH; found = 1; } } if ((found == 0) && (self->crypt_method & CRYPT_METHOD_40BIT) && (self->crypt_level == CRYPT_LEVEL_CLIENT_COMPATIBLE)) { if (crypt_method & CRYPT_METHOD_40BIT) { g_writeln(" client and server support medium crypt, using " "medium crypt"); self->crypt_method = CRYPT_METHOD_40BIT; self->crypt_level = CRYPT_LEVEL_CLIENT_COMPATIBLE; found = 1; } } if ((found == 0) && (self->crypt_method & CRYPT_METHOD_40BIT) && (self->crypt_level == CRYPT_LEVEL_LOW)) { if (crypt_method & CRYPT_METHOD_40BIT) { g_writeln(" client and server support low crypt, using " "low crypt"); self->crypt_method = CRYPT_METHOD_40BIT; self->crypt_level = CRYPT_LEVEL_LOW; found = 1; } } if ((found == 0) && (self->crypt_level == CRYPT_LEVEL_NONE)) { if (crypt_method == CRYPT_METHOD_NONE) { g_writeln(" client and server support none crypt, using " "none crypt"); self->crypt_method = CRYPT_METHOD_NONE; self->crypt_level = CRYPT_LEVEL_NONE; found = 1; } } // if (found == 0) // { // g_writeln(" can not find client / server agreed encryption method"); // return 1; // } 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; struct xrdp_client_info *client_info = (struct xrdp_client_info *)NULL; client_info = &(self->rdp_layer->client_info); DEBUG(("processing channels, channel_code is %d", client_info->channel_code)); /* this is an option set in xrdp.ini */ if (client_info->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 > 31) { return 1; } for (index = 0; index < num_channels; index++) { struct mcs_channel_item *channel_item; channel_item = (struct mcs_channel_item *) g_malloc(sizeof(struct mcs_channel_item), 1); if (!s_check_rem(s, 12)) { g_free(channel_item); 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; } /*****************************************************************************/ /* reads the client monitors data */ static int APP_CC xrdp_sec_process_mcs_data_monitors(struct xrdp_sec *self, struct stream *s) { int index; int monitorCount; int flags; struct xrdp_client_info *client_info = (struct xrdp_client_info *)NULL; client_info = &(self->rdp_layer->client_info); DEBUG(("processing monitors data, allow_multimon is %d", client_info->multimon)); /* this is an option set in xrdp.ini */ if (client_info->multimon != 1) /* are multi-monitors allowed ? */ { DEBUG(("[INFO] xrdp_sec_process_mcs_data_monitors: multimon is not " "allowed, skipping")); return 0; } in_uint32_le(s, flags); /* flags */ //verify flags - must be 0x0 if (flags != 0) { DEBUG(("[ERROR] xrdp_sec_process_mcs_data_monitors: flags MUST be " "zero, detected: %d", flags)); return 1; } in_uint32_le(s, monitorCount); //verify monitorCount - max 16 if (monitorCount > 16) { DEBUG(("[ERROR] xrdp_sec_process_mcs_data_monitors: max allowed " "monitors is 16, detected: %d", monitorCount)); return 1; } g_writeln("monitorCount= %d", monitorCount); // for debugging only client_info->monitorCount = monitorCount; /* Add client_monitor_data to client_info struct, will later pass to X11rdp */ for (index = 0; index < monitorCount; index++) { in_uint32_le(s, client_info->minfo[index].left); in_uint32_le(s, client_info->minfo[index].top); in_uint32_le(s, client_info->minfo[index].right); in_uint32_le(s, client_info->minfo[index].bottom); in_uint32_le(s, client_info->minfo[index].is_primary); g_writeln("got a monitor: left= %d, top= %d, right= %d, bottom= %d, is_primary?= %d", client_info->minfo[index].left, client_info->minfo[index].top, client_info->minfo[index].right, client_info->minfo[index].bottom, client_info->minfo[index].is_primary); } 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))) { LLOGLN(0, ("error in xrdp_sec_process_mcs_data tag %d size %d", tag, size)); break; } LLOGLN(10, ("xrdp_sec_process_mcs_data: 0x%8.8x", tag)); switch (tag) { case SEC_TAG_CLI_INFO: /* CS_CORE 0xC001 */ if (xrdp_sec_process_mcs_data_CS_CORE(self, s) != 0) { return 1; } break; case SEC_TAG_CLI_CRYPT: /* CS_SECURITY 0xC002 */ if (xrdp_sec_process_mcs_data_CS_SECURITY(self, s) != 0) { return 1; } break; case SEC_TAG_CLI_CHANNELS: /* CS_NET 0xC003 */ if (xrdp_sec_process_mcs_data_channels(self, s) != 0) { return 1; } break; case SEC_TAG_CLI_4: /* CS_CLUSTER 0xC004 */ break; case SEC_TAG_CLI_MONITOR: /* CS_MONITOR 0xC005 */ if (xrdp_sec_process_mcs_data_monitors(self, s) != 0) { return 1; } break; /* CS_MCS_MSGCHANNEL 0xC006 CS_MONITOR_EX 0xC008 CS_MULTITRANSPORT 0xC00A SC_CORE 0x0C01 SC_SECURITY 0x0C02 SC_NET 0x0C03 SC_MCS_MSGCHANNEL 0x0C04 SC_MULTITRANSPORT 0x0C08 */ default: LLOGLN(0, ("error unknown xrdp_sec_process_mcs_data " "tag 0x%4.4x size %d", tag, size)); break; } s->p = hold_p + size; } if (self->rdp_layer->client_info.max_bpp > 0) { if (self->rdp_layer->client_info.bpp > self->rdp_layer->client_info.max_bpp) { LLOGLN(0, ("xrdp_rdp_parse_client_mcs_data: client asked " "for %dbpp connection but configuration is limited " "to %dbpp", self->rdp_layer->client_info.bpp, self->rdp_layer->client_info.max_bpp)); self->rdp_layer->client_info.bpp = self->rdp_layer->client_info.max_bpp; } } /* set p to beginning */ s->p = s->data; 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); /* get keyboard type / subtype */ s->p = s->data; if (!s_check_rem(s, 79 + 8)) { return 1; } in_uint8s(s, 79); in_uint32_le(s, client_info->keyboard_type); in_uint32_le(s, client_info->keyboard_subtype); xrdp_load_keyboard_layout(client_info); s->p = s->data; return 0; } /*****************************************************************************/ /* returns error */ int APP_CC xrdp_sec_init_rdp_security(struct xrdp_sec *self) { switch (self->rdp_layer->client_info.crypt_level) { case 0: /* none */ self->crypt_method = CRYPT_METHOD_NONE; self->crypt_level = CRYPT_LEVEL_NONE; break; case 1: /* low */ self->crypt_method = CRYPT_METHOD_40BIT; self->crypt_level = CRYPT_LEVEL_LOW; break; case 2: /* medium */ self->crypt_method = CRYPT_METHOD_40BIT; self->crypt_level = CRYPT_LEVEL_CLIENT_COMPATIBLE; break; case 3: /* high */ self->crypt_method = CRYPT_METHOD_128BIT; self->crypt_level = CRYPT_LEVEL_HIGH; break; case 4: /* fips */ self->crypt_method = CRYPT_METHOD_FIPS; self->crypt_level = CRYPT_LEVEL_FIPS; break; default: g_writeln("Fatal : Illegal crypt_level"); break ; } if (self->decrypt_rc4_info != NULL) { g_writeln("xrdp_sec_init_rdp_security: decrypt_rc4_info already created !!!"); } else { self->decrypt_rc4_info = ssl_rc4_info_create(); } if (self->encrypt_rc4_info != NULL) { g_writeln("xrdp_sec_init_rdp_security: encrypt_rc4_info already created !!!"); } else { self->encrypt_rc4_info = ssl_rc4_info_create(); } return 0; } /*****************************************************************************/ int APP_CC xrdp_sec_incoming(struct xrdp_sec *self) { struct list *items = NULL; struct list *values = NULL; struct xrdp_iso *iso; int index = 0; char *item = NULL; char *value = NULL; char key_file[256]; DEBUG((" in xrdp_sec_incoming:")); iso = self->mcs_layer->iso_layer; /* negotiate security layer */ if (xrdp_iso_incoming(iso) != 0) { DEBUG(("xrdp_sec_incoming: xrdp_iso_incoming failed")); return 1; } /* initialize selected security layer */ if (iso->requestedProtocol > PROTOCOL_RDP) { /* init tls security */ DEBUG((" in xrdp_sec_incoming: init tls security")); if (trans_set_tls_mode(self->mcs_layer->iso_layer->trans, self->rdp_layer->client_info.key_file, self->rdp_layer->client_info.certificate) != 0) { g_writeln("xrdp_sec_incoming: trans_set_tls_mode failed"); return 1; } self->crypt_level = CRYPT_LEVEL_NONE; self->crypt_method = CRYPT_METHOD_NONE; self->rsa_key_bytes = 0; } else { /* init rdp security */ DEBUG((" in xrdp_sec_incoming: init rdp security")); if (xrdp_sec_init_rdp_security(self) != 0) { DEBUG(("xrdp_sec_incoming: xrdp_sec_init_rdp_security failed")); return 1; } if (self->crypt_method != CRYPT_METHOD_NONE) { g_memset(key_file, 0, sizeof(char) * 256); 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 */ log_message(LOG_LEVEL_ALWAYS, "XRDP cannot read file: %s " "(check permissions)", 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) { self->rsa_key_bytes = (g_strlen(value) + 1) / 5; g_writeln("pub_mod bytes %d", self->rsa_key_bytes); hex_str_to_bin(value, self->pub_mod, self->rsa_key_bytes); } 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) { self->rsa_key_bytes = (g_strlen(value) + 1) / 5; g_writeln("pri_exp %d", self->rsa_key_bytes); hex_str_to_bin(value, self->pri_exp, self->rsa_key_bytes); } } list_delete(items); list_delete(values); } } /* negotiate mcs layer */ 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; } LLOGLN(10, ("xrdp_sec_incoming: out")); 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; }