Diffstat (limited to 'noncore/net/opierdesktop/licence.cpp') (more/less context) (ignore whitespace changes)
| -rw-r--r-- | noncore/net/opierdesktop/licence.cpp | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/noncore/net/opierdesktop/licence.cpp b/noncore/net/opierdesktop/licence.cpp new file mode 100644 index 0000000..4e5bc38 --- a/dev/null +++ b/noncore/net/opierdesktop/licence.cpp @@ -0,0 +1,314 @@ +/* + rdesktop: A Remote Desktop Protocol client. + RDP licensing negotiation + Copyright (C) Matthew Chapman 1999-2002 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "rdesktop.h" + +#ifdef WITH_OPENSSL +#include <openssl/rc4.h> +#else +#include "crypto/rc4.h" +#endif + +extern char username[16]; +extern char hostname[16]; + +static uint8 licence_key[16]; +static uint8 licence_sign_key[16]; + +BOOL licence_issued = False; + +/* Generate a session key and RC4 keys, given client and server randoms */ +static void +licence_generate_keys(uint8 * client_key, uint8 * server_key, uint8 * client_rsa) +{ + uint8 session_key[48]; + uint8 temp_hash[48]; + + /* Generate session key - two rounds of sec_hash_48 */ + sec_hash_48(temp_hash, client_rsa, client_key, server_key, 65); + sec_hash_48(session_key, temp_hash, server_key, client_key, 65); + + /* Store first 16 bytes of session key, for generating signatures */ + memcpy(licence_sign_key, session_key, 16); + + /* Generate RC4 key */ + sec_hash_16(licence_key, &session_key[16], client_key, server_key); +} + +static void +licence_generate_hwid(uint8 * hwid) +{ + buf_out_uint32(hwid, 2); + strncpy((char *) (hwid + 4), hostname, LICENCE_HWID_SIZE - 4); +} + +/* Present an existing licence to the server */ +static void +licence_present(uint8 * client_random, uint8 * rsa_data, + uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature) +{ + uint32 sec_flags = SEC_LICENCE_NEG; + uint16 length = + 16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE + + licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE; + STREAM s; + + s = sec_init(sec_flags, length + 4); + + out_uint16_le(s, LICENCE_TAG_PRESENT); + out_uint16_le(s, length); + + out_uint32_le(s, 1); + out_uint16(s, 0); + out_uint16_le(s, 0x0201); + + out_uint8p(s, client_random, SEC_RANDOM_SIZE); + out_uint16(s, 0); + out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE)); + out_uint8p(s, rsa_data, SEC_MODULUS_SIZE); + out_uint8s(s, SEC_PADDING_SIZE); + + out_uint16_le(s, 1); + out_uint16_le(s, licence_size); + out_uint8p(s, licence_data, licence_size); + + out_uint16_le(s, 1); + out_uint16_le(s, LICENCE_HWID_SIZE); + out_uint8p(s, hwid, LICENCE_HWID_SIZE); + + out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE); + + s_mark_end(s); + sec_send(s, sec_flags); +} + +/* Send a licence request packet */ +static void +licence_send_request(uint8 * client_random, uint8 * rsa_data, char *user, char *host) +{ + uint32 sec_flags = SEC_LICENCE_NEG; + uint16 userlen = strlen(user) + 1; + uint16 hostlen = strlen(host) + 1; + uint16 length = 128 + userlen + hostlen; + STREAM s; + + s = sec_init(sec_flags, length + 2); + + out_uint16_le(s, LICENCE_TAG_REQUEST); + out_uint16_le(s, length); + + out_uint32_le(s, 1); + out_uint16(s, 0); + out_uint16_le(s, 0xff01); + + out_uint8p(s, client_random, SEC_RANDOM_SIZE); + out_uint16(s, 0); + out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE)); + out_uint8p(s, rsa_data, SEC_MODULUS_SIZE); + out_uint8s(s, SEC_PADDING_SIZE); + + out_uint16(s, LICENCE_TAG_USER); + out_uint16(s, userlen); + out_uint8p(s, user, userlen); + + out_uint16(s, LICENCE_TAG_HOST); + out_uint16(s, hostlen); + out_uint8p(s, host, hostlen); + + s_mark_end(s); + sec_send(s, sec_flags); +} + +/* Process a licence demand packet */ +static void +licence_process_demand(STREAM s) +{ + uint8 null_data[SEC_MODULUS_SIZE]; + uint8 *server_random; + uint8 signature[LICENCE_SIGNATURE_SIZE]; + uint8 hwid[LICENCE_HWID_SIZE]; + uint8 *licence_data; + int licence_size; + RC4_KEY crypt_key; + + /* Retrieve the server random from the incoming packet */ + in_uint8p(s, server_random, SEC_RANDOM_SIZE); + + /* We currently use null client keys. This is a bit naughty but, hey, + the security of licence negotiation isn't exactly paramount. */ + memset(null_data, 0, sizeof(null_data)); + licence_generate_keys(null_data, server_random, null_data); + + licence_size = load_licence(&licence_data); + if (licence_size != -1) + { + /* Generate a signature for the HWID buffer */ + licence_generate_hwid(hwid); + sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid)); + + /* Now encrypt the HWID */ + RC4_set_key(&crypt_key, 16, licence_key); + RC4(&crypt_key, sizeof(hwid), hwid, hwid); + + licence_present(null_data, null_data, licence_data, licence_size, hwid, signature); + xfree(licence_data); + return; + } + + licence_send_request(null_data, null_data, username, hostname); +} + +/* Send an authentication response packet */ +static void +licence_send_authresp(uint8 * token, uint8 * crypt_hwid, uint8 * signature) +{ + uint32 sec_flags = SEC_LICENCE_NEG; + uint16 length = 58; + STREAM s; + + s = sec_init(sec_flags, length + 2); + + out_uint16_le(s, LICENCE_TAG_AUTHRESP); + out_uint16_le(s, length); + + out_uint16_le(s, 1); + out_uint16_le(s, LICENCE_TOKEN_SIZE); + out_uint8p(s, token, LICENCE_TOKEN_SIZE); + + out_uint16_le(s, 1); + out_uint16_le(s, LICENCE_HWID_SIZE); + out_uint8p(s, crypt_hwid, LICENCE_HWID_SIZE); + + out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE); + + s_mark_end(s); + sec_send(s, sec_flags); +} + +/* Parse an authentication request packet */ +static BOOL +licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature) +{ + uint16 tokenlen; + + in_uint8s(s, 6); /* unknown: f8 3d 15 00 04 f6 */ + + in_uint16_le(s, tokenlen); + if (tokenlen != LICENCE_TOKEN_SIZE) + { + error("token len %d\n", tokenlen); + return False; + } + + in_uint8p(s, *token, tokenlen); + in_uint8p(s, *signature, LICENCE_SIGNATURE_SIZE); + + return s_check_end(s); +} + +/* Process an authentication request packet */ +static void +licence_process_authreq(STREAM s) +{ + uint8 *in_token, *in_sig; + uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE]; + uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE]; + uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE]; + uint8 out_sig[LICENCE_SIGNATURE_SIZE]; + RC4_KEY crypt_key; + + /* Parse incoming packet and save the encrypted token */ + licence_parse_authreq(s, &in_token, &in_sig); + memcpy(out_token, in_token, LICENCE_TOKEN_SIZE); + + /* Decrypt the token. It should read TEST in Unicode. */ + RC4_set_key(&crypt_key, 16, licence_key); + RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token); + + /* Generate a signature for a buffer of token and HWID */ + licence_generate_hwid(hwid); + memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE); + memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE); + sec_sign(out_sig, 16, licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer)); + + /* Now encrypt the HWID */ + RC4_set_key(&crypt_key, 16, licence_key); + RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid); + + licence_send_authresp(out_token, crypt_hwid, out_sig); +} + +/* Process an licence issue packet */ +static void +licence_process_issue(STREAM s) +{ + RC4_KEY crypt_key; + uint32 length; + uint16 check; + + in_uint8s(s, 2); /* 3d 45 - unknown */ + in_uint16_le(s, length); + if (!s_check_rem(s, length)) + return; + + RC4_set_key(&crypt_key, 16, licence_key); + RC4(&crypt_key, length, s->p, s->p); + + in_uint16(s, check); + if (check != 0) + return; + + licence_issued = True; + save_licence(s->p, length - 2); +} + +/* Process a licence packet */ +void +licence_process(STREAM s) +{ + uint16 tag; + + in_uint16_le(s, tag); + in_uint8s(s, 2); /* length */ + + switch (tag) + { + case LICENCE_TAG_DEMAND: + licence_process_demand(s); + break; + + case LICENCE_TAG_AUTHREQ: + licence_process_authreq(s); + break; + + case LICENCE_TAG_ISSUE: + licence_process_issue(s); + break; + + case LICENCE_TAG_REISSUE: + break; + + case LICENCE_TAG_RESULT: + break; + + default: + unimpl("licence tag 0x%x\n", tag); + } +} |