1 |
/* |
/* |
2 |
rdesktop: A Remote Desktop Protocol client. |
rdesktop: A Remote Desktop Protocol client. |
3 |
RDP licensing negotiation |
RDP licensing negotiation |
4 |
Copyright (C) Matthew Chapman 1999-2001 |
Copyright (C) Matthew Chapman 1999-2002 |
5 |
|
|
6 |
This program is free software; you can redistribute it and/or modify |
This program is free software; you can redistribute it and/or modify |
7 |
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 |
18 |
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
19 |
*/ |
*/ |
20 |
|
|
21 |
|
#include <sys/types.h> |
22 |
|
#include <sys/stat.h> |
23 |
|
#include <unistd.h> |
24 |
|
#include <fcntl.h> |
25 |
|
#include <errno.h> |
26 |
#include "rdesktop.h" |
#include "rdesktop.h" |
27 |
|
|
28 |
|
#ifdef WITH_OPENSSL |
29 |
|
#include <openssl/rc4.h> |
30 |
|
#else |
31 |
#include "crypto/rc4.h" |
#include "crypto/rc4.h" |
32 |
|
#endif |
33 |
|
|
34 |
extern char username[16]; |
extern char username[16]; |
35 |
extern char hostname[16]; |
extern char hostname[16]; |
|
extern BOOL licence; |
|
36 |
|
|
37 |
static uint8 licence_key[16]; |
static uint8 licence_key[16]; |
38 |
static uint8 licence_sign_key[16]; |
static uint8 licence_sign_key[16]; |
39 |
|
|
40 |
BOOL licence_issued = False; |
BOOL licence_issued = False; |
41 |
|
|
42 |
|
|
43 |
|
int |
44 |
|
load_licence(unsigned char **data) |
45 |
|
{ |
46 |
|
char *path; |
47 |
|
char *home; |
48 |
|
struct stat st; |
49 |
|
int fd; |
50 |
|
|
51 |
|
home = getenv("HOME"); |
52 |
|
if (home == NULL) |
53 |
|
return -1; |
54 |
|
|
55 |
|
path = xmalloc(strlen(home) + strlen(hostname) + 20); |
56 |
|
sprintf(path, "%s/.rdesktop/licence.%s", home, hostname); |
57 |
|
|
58 |
|
fd = open(path, O_RDONLY); |
59 |
|
if (fd == -1) |
60 |
|
return -1; |
61 |
|
|
62 |
|
if (fstat(fd, &st)) |
63 |
|
return -1; |
64 |
|
|
65 |
|
*data = xmalloc(st.st_size); |
66 |
|
return read(fd, *data, st.st_size); |
67 |
|
} |
68 |
|
|
69 |
|
void |
70 |
|
save_licence(unsigned char *data, int length) |
71 |
|
{ |
72 |
|
char *fpath; /* file path for licence */ |
73 |
|
char *fname, *fnamewrk; /* file name for licence .inkl path. */ |
74 |
|
char *home; |
75 |
|
uint32 y; |
76 |
|
struct flock fnfl; |
77 |
|
int fnfd, fnwrkfd, i, wlen; |
78 |
|
struct stream s, *s_ptr; |
79 |
|
uint32 len; |
80 |
|
|
81 |
|
/* Construct a stream, so that we can use macros to extract the |
82 |
|
* licence. |
83 |
|
*/ |
84 |
|
s_ptr = &s; |
85 |
|
s_ptr->p = data; |
86 |
|
/* Skip first two bytes */ |
87 |
|
in_uint16(s_ptr, len); |
88 |
|
|
89 |
|
/* Skip three strings */ |
90 |
|
for (i = 0; i < 3; i++) |
91 |
|
{ |
92 |
|
in_uint32(s_ptr, len); |
93 |
|
s_ptr->p += len; |
94 |
|
/* Make sure that we won't be past the end of data after |
95 |
|
* reading the next length value |
96 |
|
*/ |
97 |
|
if ((s_ptr->p) + 4 > data + length) |
98 |
|
{ |
99 |
|
printf("Error in parsing licence key.\n"); |
100 |
|
printf("Strings %d end value %x > supplied length (%x)\n", i, |
101 |
|
(unsigned int) s_ptr->p, (unsigned int) data + length); |
102 |
|
return; |
103 |
|
} |
104 |
|
} |
105 |
|
in_uint32(s_ptr, len); |
106 |
|
if (s_ptr->p + len > data + length) |
107 |
|
{ |
108 |
|
printf("Error in parsing licence key.\n"); |
109 |
|
printf("End of licence %x > supplied length (%x)\n", |
110 |
|
(unsigned int) s_ptr->p + len, (unsigned int) data + length); |
111 |
|
return; |
112 |
|
} |
113 |
|
|
114 |
|
home = getenv("HOME"); |
115 |
|
if (home == NULL) |
116 |
|
return; |
117 |
|
|
118 |
|
/* set and create the directory -- if it doesn't exist. */ |
119 |
|
fpath = xmalloc(strlen(home) + 11); |
120 |
|
STRNCPY(fpath, home, strlen(home) + 1); |
121 |
|
|
122 |
|
sprintf(fpath, "%s/.rdesktop", fpath); |
123 |
|
if (mkdir(fpath, 0700) == -1 && errno != EEXIST) |
124 |
|
{ |
125 |
|
perror("mkdir"); |
126 |
|
exit(1); |
127 |
|
} |
128 |
|
|
129 |
|
/* set the real licence filename, and put a write lock on it. */ |
130 |
|
fname = xmalloc(strlen(fpath) + strlen(hostname) + 10); |
131 |
|
sprintf(fname, "%s/licence.%s", fpath, hostname); |
132 |
|
fnfd = open(fname, O_RDONLY); |
133 |
|
if (fnfd != -1) |
134 |
|
{ |
135 |
|
fnfl.l_type = F_WRLCK; |
136 |
|
fnfl.l_whence = SEEK_SET; |
137 |
|
fnfl.l_start = 0; |
138 |
|
fnfl.l_len = 1; |
139 |
|
fcntl(fnfd, F_SETLK, &fnfl); |
140 |
|
} |
141 |
|
|
142 |
|
/* create a temporary licence file */ |
143 |
|
fnamewrk = xmalloc(strlen(fname) + 12); |
144 |
|
for (y = 0;; y++) |
145 |
|
{ |
146 |
|
sprintf(fnamewrk, "%s.%lu", fname, (long unsigned int) y); |
147 |
|
fnwrkfd = open(fnamewrk, O_WRONLY | O_CREAT | O_EXCL, 0600); |
148 |
|
if (fnwrkfd == -1) |
149 |
|
{ |
150 |
|
if (errno == EINTR || errno == EEXIST) |
151 |
|
continue; |
152 |
|
perror("create"); |
153 |
|
exit(1); |
154 |
|
} |
155 |
|
break; |
156 |
|
} |
157 |
|
/* write to the licence file */ |
158 |
|
for (y = 0; y < len;) |
159 |
|
{ |
160 |
|
do |
161 |
|
{ |
162 |
|
wlen = write(fnwrkfd, s_ptr->p + y, len - y); |
163 |
|
} |
164 |
|
while (wlen == -1 && errno == EINTR); |
165 |
|
if (wlen < 1) |
166 |
|
{ |
167 |
|
perror("write"); |
168 |
|
unlink(fnamewrk); |
169 |
|
exit(1); |
170 |
|
} |
171 |
|
y += wlen; |
172 |
|
} |
173 |
|
|
174 |
|
/* close the file and rename it to fname */ |
175 |
|
if (close(fnwrkfd) == -1) |
176 |
|
{ |
177 |
|
perror("close"); |
178 |
|
unlink(fnamewrk); |
179 |
|
exit(1); |
180 |
|
} |
181 |
|
if (rename(fnamewrk, fname) == -1) |
182 |
|
{ |
183 |
|
perror("rename"); |
184 |
|
unlink(fnamewrk); |
185 |
|
exit(1); |
186 |
|
} |
187 |
|
/* close the file lock on fname */ |
188 |
|
if (fnfd != -1) |
189 |
|
{ |
190 |
|
fnfl.l_type = F_UNLCK; |
191 |
|
fnfl.l_whence = SEEK_SET; |
192 |
|
fnfl.l_start = 0; |
193 |
|
fnfl.l_len = 1; |
194 |
|
fcntl(fnfd, F_SETLK, &fnfl); |
195 |
|
close(fnfd); |
196 |
|
} |
197 |
|
|
198 |
|
} |
199 |
|
|
200 |
/* Generate a session key and RC4 keys, given client and server randoms */ |
/* Generate a session key and RC4 keys, given client and server randoms */ |
201 |
static void |
static void |
202 |
licence_generate_keys(uint8 * client_key, uint8 * server_key, uint8 * client_rsa) |
licence_generate_keys(uint8 * client_key, uint8 * server_key, uint8 * client_rsa) |
304 |
licence_process_demand(STREAM s) |
licence_process_demand(STREAM s) |
305 |
{ |
{ |
306 |
uint8 null_data[SEC_MODULUS_SIZE]; |
uint8 null_data[SEC_MODULUS_SIZE]; |
|
uint8 hwid[LICENCE_HWID_SIZE]; |
|
|
uint8 signature[LICENCE_SIGNATURE_SIZE]; |
|
307 |
uint8 *server_random; |
uint8 *server_random; |
308 |
|
uint8 signature[LICENCE_SIGNATURE_SIZE]; |
309 |
|
uint8 hwid[LICENCE_HWID_SIZE]; |
310 |
uint8 *licence_data; |
uint8 *licence_data; |
311 |
int licence_size; |
int licence_size; |
312 |
RC4_KEY crypt_key; |
RC4_KEY crypt_key; |
320 |
licence_generate_keys(null_data, server_random, null_data); |
licence_generate_keys(null_data, server_random, null_data); |
321 |
|
|
322 |
licence_size = load_licence(&licence_data); |
licence_size = load_licence(&licence_data); |
323 |
if (licence_size == -1) |
if (licence_size != -1) |
324 |
{ |
{ |
325 |
licence_send_request(null_data, null_data, username, hostname); |
/* Generate a signature for the HWID buffer */ |
326 |
|
licence_generate_hwid(hwid); |
327 |
|
sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid)); |
328 |
|
|
329 |
|
/* Now encrypt the HWID */ |
330 |
|
RC4_set_key(&crypt_key, 16, licence_key); |
331 |
|
RC4(&crypt_key, sizeof(hwid), hwid, hwid); |
332 |
|
|
333 |
|
licence_present(null_data, null_data, licence_data, licence_size, hwid, signature); |
334 |
|
xfree(licence_data); |
335 |
return; |
return; |
336 |
} |
} |
337 |
|
|
338 |
/* Generate a signature for the HWID buffer */ |
licence_send_request(null_data, null_data, username, hostname); |
|
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); |
|
339 |
} |
} |
340 |
|
|
341 |
/* Send an authentication response packet */ |
/* Send an authentication response packet */ |
411 |
memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE); |
memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE); |
412 |
sec_sign(out_sig, 16, licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer)); |
sec_sign(out_sig, 16, licence_sign_key, 16, sealed_buffer, sizeof(sealed_buffer)); |
413 |
|
|
|
/* Deliberately break signature if licencing disabled */ |
|
|
if (!licence) |
|
|
memset(out_sig, 0, sizeof(out_sig)); |
|
|
|
|
414 |
/* Now encrypt the HWID */ |
/* Now encrypt the HWID */ |
415 |
RC4_set_key(&crypt_key, 16, licence_key); |
RC4_set_key(&crypt_key, 16, licence_key); |
416 |
RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid); |
RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid); |