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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
*/ |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <errno.h> |
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#include "rdesktop.h" |
#include "rdesktop.h" |
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#ifdef WITH_OPENSSL |
#ifdef WITH_OPENSSL |
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#include "crypto/rc4.h" |
#include "crypto/rc4.h" |
27 |
#endif |
#endif |
28 |
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29 |
extern char username[16]; |
extern char g_username[16]; |
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extern char hostname[16]; |
extern char hostname[16]; |
31 |
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32 |
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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int |
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load_licence(unsigned char **data) |
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{ |
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char *path; |
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char *home; |
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struct stat st; |
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int fd; |
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home = getenv("HOME"); |
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if (home == NULL) |
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return -1; |
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path = xmalloc(strlen(home) + strlen(hostname) + 20); |
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sprintf(path, "%s/.rdesktop/licence.%s", home, hostname); |
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fd = open(path, O_RDONLY); |
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if (fd == -1) |
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return -1; |
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if (fstat(fd, &st)) |
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return -1; |
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*data = xmalloc(st.st_size); |
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return read(fd, *data, st.st_size); |
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} |
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void |
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save_licence(unsigned char *data, int length) |
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{ |
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char *fpath; /* file path for licence */ |
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char *fname, *fnamewrk; /* file name for licence .inkl path. */ |
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char *home; |
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uint32 y; |
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struct flock fnfl; |
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int fnfd, fnwrkfd, i, wlen; |
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struct stream s, *s_ptr; |
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uint32 len; |
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/* Construct a stream, so that we can use macros to extract the |
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* licence. |
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*/ |
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s_ptr = &s; |
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s_ptr->p = data; |
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/* Skip first two bytes */ |
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in_uint16(s_ptr, len); |
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/* Skip three strings */ |
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for (i = 0; i < 3; i++) |
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{ |
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in_uint32(s_ptr, len); |
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s_ptr->p += len; |
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/* Make sure that we won't be past the end of data after |
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* reading the next length value |
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*/ |
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if ((s_ptr->p) + 4 > data + length) |
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{ |
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printf("Error in parsing licence key.\n"); |
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printf("Strings %d end value %x > supplied length (%x)\n", i, |
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(unsigned int)s_ptr->p, |
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(unsigned int)data + length); |
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return; |
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} |
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} |
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in_uint32(s_ptr, len); |
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if (s_ptr->p + len > data + length) |
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{ |
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printf("Error in parsing licence key.\n"); |
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printf("End of licence %x > supplied length (%x)\n", |
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(unsigned int)s_ptr->p + len, |
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(unsigned int)data + length); |
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return; |
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} |
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home = getenv("HOME"); |
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if (home == NULL) |
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return; |
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/* set and create the directory -- if it doesn't exist. */ |
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fpath = xmalloc(strlen(home) + 11); |
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STRNCPY(fpath, home, strlen(home) + 1); |
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sprintf(fpath, "%s/.rdesktop", fpath); |
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if (mkdir(fpath, 0700) == -1 && errno != EEXIST) |
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{ |
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perror("mkdir"); |
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exit(1); |
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} |
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/* set the real licence filename, and put a write lock on it. */ |
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fname = xmalloc(strlen(fpath) + strlen(hostname) + 10); |
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sprintf(fname, "%s/licence.%s", fpath, hostname); |
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fnfd = open(fname, O_RDONLY); |
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if (fnfd != -1) |
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{ |
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fnfl.l_type = F_WRLCK; |
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fnfl.l_whence = SEEK_SET; |
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fnfl.l_start = 0; |
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fnfl.l_len = 1; |
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fcntl(fnfd, F_SETLK, &fnfl); |
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} |
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/* create a temporary licence file */ |
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fnamewrk = xmalloc(strlen(fname) + 12); |
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for (y = 0;; y++) |
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{ |
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sprintf(fnamewrk, "%s.%lu", fname, (long unsigned int)y); |
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fnwrkfd = open(fnamewrk, O_WRONLY | O_CREAT | O_EXCL, 0600); |
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if (fnwrkfd == -1) |
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{ |
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if (errno == EINTR || errno == EEXIST) |
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continue; |
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perror("create"); |
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exit(1); |
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} |
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break; |
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} |
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/* write to the licence file */ |
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for (y = 0; y < len;) |
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{ |
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do |
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{ |
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wlen = write(fnwrkfd, s_ptr->p + y, len - y); |
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} |
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while (wlen == -1 && errno == EINTR); |
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if (wlen < 1) |
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{ |
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perror("write"); |
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unlink(fnamewrk); |
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exit(1); |
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} |
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y += wlen; |
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} |
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/* close the file and rename it to fname */ |
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if (close(fnwrkfd) == -1) |
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{ |
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perror("close"); |
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unlink(fnamewrk); |
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exit(1); |
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} |
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if (rename(fnamewrk, fname) == -1) |
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{ |
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perror("rename"); |
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unlink(fnamewrk); |
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exit(1); |
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} |
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/* close the file lock on fname */ |
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if (fnfd != -1) |
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{ |
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fnfl.l_type = F_UNLCK; |
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fnfl.l_whence = SEEK_SET; |
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fnfl.l_start = 0; |
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fnfl.l_len = 1; |
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fcntl(fnfd, F_SETLK, &fnfl); |
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close(fnfd); |
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} |
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} |
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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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sec_hash_48(session_key, temp_hash, server_key, client_key, 65); |
sec_hash_48(session_key, temp_hash, server_key, client_key, 65); |
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/* Store first 16 bytes of session key, for generating signatures */ |
/* Store first 16 bytes of session key, for generating signatures */ |
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memcpy(licence_sign_key, session_key, 16); |
memcpy(g_licence_sign_key, session_key, 16); |
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/* Generate RC4 key */ |
/* Generate RC4 key */ |
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sec_hash_16(licence_key, &session_key[16], client_key, server_key); |
sec_hash_16(g_licence_key, &session_key[16], client_key, server_key); |
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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_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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/* Generate a signature for the HWID buffer */ |
/* Generate a signature for the HWID buffer */ |
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licence_generate_hwid(hwid); |
licence_generate_hwid(hwid); |
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sec_sign(signature, 16, licence_sign_key, 16, hwid, sizeof(hwid)); |
sec_sign(signature, 16, g_licence_sign_key, 16, hwid, sizeof(hwid)); |
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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, sizeof(hwid), hwid, hwid); |
RC4(&crypt_key, sizeof(hwid), hwid, hwid); |
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licence_present(null_data, null_data, licence_data, licence_size, hwid, signature); |
licence_present(null_data, null_data, licence_data, licence_size, hwid, signature); |
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return; |
return; |
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} |
} |
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licence_send_request(null_data, null_data, username, hostname); |
licence_send_request(null_data, null_data, g_username, hostname); |
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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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/* 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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} |
295 |
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g_licence_issued = True; |
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save_licence(s->p, length); |
298 |
} |
} |
299 |
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/* Process a licence packet */ |
/* Process a licence packet */ |
301 |
void |
void |
302 |
licence_process(STREAM s) |
licence_process(STREAM s) |
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{ |
{ |
304 |
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) |
310 |
{ |
{ |
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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; |
326 |
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328 |
unimpl("licence tag 0x%x\n", tag); |
unimpl("licence tag 0x%x\n", tag); |
329 |
} |
} |
330 |
} |
} |
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