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/* |
/* |
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rdesktop: A Remote Desktop Protocol client. |
rdesktop: A Remote Desktop Protocol client. |
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RDP licensing negotiation |
RDP licensing negotiation |
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Copyright (C) Matthew Chapman 1999-2001 |
Copyright (C) Matthew Chapman 1999-2002 |
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This program is free software; you can redistribute it and/or modify |
This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
it under the terms of the GNU General Public License as published by |
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*/ |
*/ |
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#include "rdesktop.h" |
#include "rdesktop.h" |
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#ifdef WITH_OPENSSL |
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#include <openssl/rc4.h> |
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#else |
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#include "crypto/rc4.h" |
#include "crypto/rc4.h" |
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#endif |
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extern char username[16]; |
extern char g_username[16]; |
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extern char hostname[16]; |
extern char hostname[16]; |
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extern BOOL licence; |
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static uint8 licence_key[16]; |
static uint8 g_licence_key[16]; |
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static uint8 licence_sign_key[16]; |
static uint8 g_licence_sign_key[16]; |
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BOOL licence_issued = False; |
BOOL g_licence_issued = False; |
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/* Generate a session key and RC4 keys, given client and server randoms */ |
/* Generate a session key and RC4 keys, given client and server randoms */ |
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static void |
static void |
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licence_generate_keys(uint8 * client_key, uint8 * server_key, uint8 * client_rsa) |
licence_generate_keys(uint8 * client_random, uint8 * server_random, uint8 * pre_master_secret) |
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{ |
{ |
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uint8 session_key[48]; |
uint8 master_secret[48]; |
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uint8 temp_hash[48]; |
uint8 key_block[48]; |
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/* Generate session key - two rounds of sec_hash_48 */ |
/* Generate master secret and then key material */ |
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sec_hash_48(temp_hash, client_rsa, client_key, server_key, 65); |
sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A'); |
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sec_hash_48(session_key, temp_hash, server_key, client_key, 65); |
sec_hash_48(key_block, master_secret, server_random, client_random, 'A'); |
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/* Store first 16 bytes of session key, for generating signatures */ |
/* Store first 16 bytes of session key as MAC secret */ |
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memcpy(licence_sign_key, session_key, 16); |
memcpy(g_licence_sign_key, key_block, 16); |
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/* Generate RC4 key */ |
/* Generate RC4 key from next 16 bytes */ |
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sec_hash_16(licence_key, &session_key[16], client_key, server_key); |
sec_hash_16(g_licence_key, &key_block[16], client_random, server_random); |
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} |
} |
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static void |
static void |
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s = sec_init(sec_flags, length + 4); |
s = sec_init(sec_flags, length + 4); |
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out_uint16_le(s, LICENCE_TAG_PRESENT); |
out_uint8(s, LICENCE_TAG_PRESENT); |
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out_uint8(s, 2); /* version */ |
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out_uint16_le(s, length); |
out_uint16_le(s, length); |
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out_uint32_le(s, 1); |
out_uint32_le(s, 1); |
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s = sec_init(sec_flags, length + 2); |
s = sec_init(sec_flags, length + 2); |
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out_uint16_le(s, LICENCE_TAG_REQUEST); |
out_uint8(s, LICENCE_TAG_REQUEST); |
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out_uint8(s, 2); /* version */ |
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out_uint16_le(s, length); |
out_uint16_le(s, length); |
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out_uint32_le(s, 1); |
out_uint32_le(s, 1); |
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out_uint8p(s, rsa_data, SEC_MODULUS_SIZE); |
out_uint8p(s, rsa_data, SEC_MODULUS_SIZE); |
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out_uint8s(s, SEC_PADDING_SIZE); |
out_uint8s(s, SEC_PADDING_SIZE); |
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out_uint16(s, LICENCE_TAG_USER); |
out_uint16_le(s, LICENCE_TAG_USER); |
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out_uint16(s, userlen); |
out_uint16_le(s, userlen); |
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out_uint8p(s, user, userlen); |
out_uint8p(s, user, userlen); |
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out_uint16(s, LICENCE_TAG_HOST); |
out_uint16_le(s, LICENCE_TAG_HOST); |
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out_uint16(s, hostlen); |
out_uint16_le(s, hostlen); |
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out_uint8p(s, host, hostlen); |
out_uint8p(s, host, hostlen); |
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s_mark_end(s); |
s_mark_end(s); |
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licence_process_demand(STREAM s) |
licence_process_demand(STREAM s) |
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{ |
{ |
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uint8 null_data[SEC_MODULUS_SIZE]; |
uint8 null_data[SEC_MODULUS_SIZE]; |
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uint8 hwid[LICENCE_HWID_SIZE]; |
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uint8 signature[LICENCE_SIGNATURE_SIZE]; |
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uint8 *server_random; |
uint8 *server_random; |
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uint8 signature[LICENCE_SIGNATURE_SIZE]; |
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uint8 hwid[LICENCE_HWID_SIZE]; |
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uint8 *licence_data; |
uint8 *licence_data; |
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int licence_size; |
int licence_size; |
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RC4_KEY crypt_key; |
RC4_KEY crypt_key; |
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licence_generate_keys(null_data, server_random, null_data); |
licence_generate_keys(null_data, server_random, null_data); |
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licence_size = load_licence(&licence_data); |
licence_size = load_licence(&licence_data); |
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if (licence_size == -1) |
if (licence_size > 0) |
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{ |
{ |
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licence_send_request(null_data, null_data, username, hostname); |
/* Generate a signature for the HWID buffer */ |
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licence_generate_hwid(hwid); |
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sec_sign(signature, 16, g_licence_sign_key, 16, hwid, sizeof(hwid)); |
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/* Now encrypt the HWID */ |
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RC4_set_key(&crypt_key, 16, g_licence_key); |
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RC4(&crypt_key, sizeof(hwid), hwid, hwid); |
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licence_present(null_data, null_data, licence_data, licence_size, hwid, signature); |
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xfree(licence_data); |
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return; |
return; |
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} |
} |
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/* Generate a signature for the HWID buffer */ |
licence_send_request(null_data, null_data, g_username, hostname); |
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licence_generate_hwid(hwid); |
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sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid)); |
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/* Now encrypt the HWID */ |
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RC4_set_key(&crypt_key, 16, licence_key); |
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RC4(&crypt_key, sizeof(hwid), hwid, hwid); |
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licence_present(null_data, null_data, licence_data, licence_size, hwid, signature); |
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xfree(licence_data); |
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} |
} |
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/* Send an authentication response packet */ |
/* Send an authentication response packet */ |
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s = sec_init(sec_flags, length + 2); |
s = sec_init(sec_flags, length + 2); |
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out_uint16_le(s, LICENCE_TAG_AUTHRESP); |
out_uint8(s, LICENCE_TAG_AUTHRESP); |
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out_uint8(s, 2); /* version */ |
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out_uint16_le(s, length); |
out_uint16_le(s, length); |
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out_uint16_le(s, 1); |
out_uint16_le(s, 1); |
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memcpy(out_token, in_token, LICENCE_TOKEN_SIZE); |
memcpy(out_token, in_token, LICENCE_TOKEN_SIZE); |
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/* Decrypt the token. It should read TEST in Unicode. */ |
/* Decrypt the token. It should read TEST in Unicode. */ |
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RC4_set_key(&crypt_key, 16, licence_key); |
RC4_set_key(&crypt_key, 16, g_licence_key); |
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RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token); |
RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token); |
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/* Generate a signature for a buffer of token and HWID */ |
/* Generate a signature for a buffer of token and HWID */ |
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licence_generate_hwid(hwid); |
licence_generate_hwid(hwid); |
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memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE); |
memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE); |
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memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE); |
memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE); |
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sec_sign(out_sig, 16, licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer)); |
sec_sign(out_sig, 16, g_licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer)); |
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/* Deliberately break signature if licencing disabled */ |
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if (!licence) |
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memset(out_sig, 0, sizeof(out_sig)); |
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/* Now encrypt the HWID */ |
/* Now encrypt the HWID */ |
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RC4_set_key(&crypt_key, 16, licence_key); |
RC4_set_key(&crypt_key, 16, g_licence_key); |
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RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid); |
RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid); |
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licence_send_authresp(out_token, crypt_hwid, out_sig); |
licence_send_authresp(out_token, crypt_hwid, out_sig); |
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RC4_KEY crypt_key; |
RC4_KEY crypt_key; |
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uint32 length; |
uint32 length; |
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uint16 check; |
uint16 check; |
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int i; |
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in_uint8s(s, 2); /* 3d 45 - unknown */ |
in_uint8s(s, 2); /* 3d 45 - unknown */ |
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in_uint16_le(s, length); |
in_uint16_le(s, length); |
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if (!s_check_rem(s, length)) |
if (!s_check_rem(s, length)) |
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return; |
return; |
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RC4_set_key(&crypt_key, 16, licence_key); |
RC4_set_key(&crypt_key, 16, g_licence_key); |
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RC4(&crypt_key, length, s->p, s->p); |
RC4(&crypt_key, length, s->p, s->p); |
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in_uint16(s, check); |
in_uint16(s, check); |
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if (check != 0) |
if (check != 0) |
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return; |
return; |
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licence_issued = True; |
g_licence_issued = True; |
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save_licence(s->p, length - 2); |
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in_uint8s(s, 2); /* pad */ |
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/* advance to fourth string */ |
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length = 0; |
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for (i = 0; i < 4; i++) |
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{ |
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in_uint8s(s, length); |
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in_uint32_le(s, length); |
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if (!s_check_rem(s, length)) |
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return; |
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} |
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g_licence_issued = True; |
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save_licence(s->p, length); |
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} |
} |
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/* Process a licence packet */ |
/* Process a licence packet */ |
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void |
void |
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licence_process(STREAM s) |
licence_process(STREAM s) |
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{ |
{ |
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uint16 tag; |
uint8 tag; |
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in_uint16_le(s, tag); |
in_uint8(s, tag); |
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in_uint8s(s, 2); /* length */ |
in_uint8s(s, 3); /* version, length */ |
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switch (tag) |
switch (tag) |
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{ |
{ |
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break; |
break; |
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case LICENCE_TAG_REISSUE: |
case LICENCE_TAG_REISSUE: |
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break; |
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case LICENCE_TAG_RESULT: |
case LICENCE_TAG_RESULT: |
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break; |
break; |
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