/** * xrdp: A Remote Desktop Protocol server. * * Copyright (C) Jay Sorg 2004-2013 * * 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" /* 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 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++; } } /*****************************************************************************/ struct xrdp_sec *APP_CC xrdp_sec_create(struct xrdp_rdp *owner, struct trans *trans, int crypt_level, int channel_code, int multimon) { 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->rc4_key_size = 1; /* 1 = 40 bit, 2 = 128 bit */ self->crypt_level = 1; /* 1, 2, 3 = low, medium, high */ switch (crypt_level) { case 1: self->rc4_key_size = 1; self->crypt_level = 1; break; case 2: self->rc4_key_size = 1; self->crypt_level = 2; break; case 3: self->rc4_key_size = 2; self->crypt_level = 3; break; default: g_writeln("Fatal : Illegal crypt_level"); break ; } self->channel_code = channel_code; self->multimon = multimon; if (self->decrypt_rc4_info != NULL) { g_writeln("xrdp_sec_create - decrypt_rc4_info already created !!!"); } self->decrypt_rc4_info = ssl_rc4_info_create(); if (self->encrypt_rc4_info != NULL) { g_writeln("xrdp_sec_create - encrypt_rc4_info already created !!!"); } self->encrypt_rc4_info = ssl_rc4_info_create(); self->mcs_layer = xrdp_mcs_create(self, trans, &self->client_mcs_data, &self->server_mcs_data); 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); ssl_rc4_info_delete(self->decrypt_rc4_info); /* TODO clear all data */ ssl_rc4_info_delete(self->encrypt_rc4_info); /* TODO clear all data */ 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 > 1) { 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_decrypt(struct xrdp_sec *self, char *data, int len) { 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_encrypt(struct xrdp_sec *self, char *data, int len) { 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")); 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); 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 timetone */ 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 = (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; } if (!s_check_rem(s, 4)) { return 1; } in_uint32_le(s, flags); DEBUG((" in xrdp_sec_recv flags $%x", flags)); if (flags & SEC_ENCRYPT) /* 0x08 */ { if (!s_check_rem(s, 8)) { return 1; } in_uint8s(s, 8); /* signature */ xrdp_sec_decrypt(self, s->p, (int)(s->end - s->p)); } if (flags & SEC_CLIENT_RANDOM) /* 0x01 */ { if (!s_check_rem(s, 4 + 64)) { return 1; } 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 > 31) { 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; } /*****************************************************************************/ /* 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 mcs_monitor_item *monitor_item; DEBUG(("processing monitors data, allow_multimon is %d", self->multimon)); /* this is an option set in xrdp.ini */ if (self->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 0; } 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 0; } for (index = 0; index < monitorCount; index++) { monitor_item = (struct mcs_monitor_item *) g_malloc(sizeof(struct mcs_monitor_item), 1); in_uint32_le(s, monitor_item->left); in_uint32_le(s, monitor_item->top); in_uint32_le(s, monitor_item->right); in_uint32_le(s, monitor_item->bottom); in_uint32_le(s, monitor_item->is_primary); list_add_item(self->mcs_layer->monitor_list, (long)monitor_item); DEBUG(("got monitor: left: %d, top: %d, right: %d, bottom: %d, is " "primary: %d", monitor_item->left, monitor_item->top, monitor_item->right, monitor_item->bottom, monitor_item->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)) { 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: if (xrdp_sec_process_mcs_data_channels(self, s) != 0) { return 1; } break; case SEC_TAG_CLI_4: break; case SEC_TAG_CLI_MONITOR: xrdp_sec_process_mcs_data_monitors(self, s); 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 */ if (self->mcs_layer->iso_layer->selectedProtocol != -1) { // Check for RDPNEGDATA availability out_uint16_be(s, 0x80fc + (num_channels_even * 2) + 4); } else { out_uint16_be(s, 0x80fc + (num_channels_even * 2)); } out_uint16_le(s, SEC_TAG_SRV_INFO); if (self->mcs_layer->iso_layer->selectedProtocol != -1) { out_uint16_le(s, 12); /* len */ } else { 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); if (self->mcs_layer->iso_layer->selectedProtocol != -1) { /* clientReqeustedProtocol */ out_uint32_le(s, self->mcs_layer->iso_layer->selectedProtocol); } 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 */ 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) { 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; }