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Read wide-string username before decoding to ascii string for entropy

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melvyn2 2022-07-13 23:11:16 -07:00 committed by Florian Bach
parent 2894faac2a
commit 2b989f21e9
1 changed files with 17 additions and 9 deletions
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26
calibre-plugin/keyextract/main.c
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@ -47,22 +47,30 @@ int main() {
// Get windows user
#define USERBUFSIZE 512
TCHAR user[USERBUFSIZE];
memset(&user, 0, sizeof(user)); // GetUserName only sets bytes as needed for length of username, but we need null bytes to fill the rest
DWORD bufsize = USERBUFSIZE ;
LSTATUS user_retval = RegGetValue(HKEY_CURRENT_USER, "Software\\Adobe\\Adept\\Device", "username", RRF_RT_REG_SZ, NULL, &user, &bufsize);
wchar_t wideuser[USERBUFSIZE];
// RegGetValueW/GetUserNameW only sets bytes as needed for length of username, but we need null bytes to fill the rest
// Only the first 13 bytes are used for entropy, so only set those
memset(&wideuser, 0, 13);
DWORD bufsize = USERBUFSIZE;
LSTATUS user_retval = RegGetValueW(HKEY_CURRENT_USER, L"Software\\Adobe\\Adept\\Device", L"username", RRF_RT_REG_SZ, NULL, &wideuser, &bufsize);
if (user_retval != ERROR_SUCCESS) {
fprintf(stderr, "Error with RegGetValue: %ld\n", user_retval);
fprintf(stderr, "bufsize: %ld\n", bufsize);
fprintf(stderr, "Falling back to GetUserName");
if (GetUserName(user, &bufsize) == 0) {
fprintf(stderr, "Falling back to GetUserNameW\n");
if (GetUserNameW(wideuser, &bufsize) == 0) {
DWORD err = GetLastError();
fprintf(stderr, "Error with GetUserName: %ld\n", err);
return err;
}
}
fprintf(stderr, "Username: %s\n", user);
fprintf(stderr, "Username: %ls\n", wideuser);
// Copy every second byte of the wide string, to make an ascii-ish/non-long string
// As adobe does
// Only the first 13 bytes are used, so only copy those
char user[13];
for (unsigned int i = 0; i < 13; i++) {
user[i] = ((char *)wideuser)[i*2];
}
// Get Encrypted adobe key
#define KEYBUFSIZE 180 // As measured
@ -112,7 +120,7 @@ int main() {
fprintf(stderr, "Decrypted key length: %lu\n", plaintext_data.cbData);
// Print decrypted key to stdout
for (int i = 0; i < 16; i++) {
for (unsigned int i = 0; i < 16; i++) {
printf("%02x", plaintext_data.pbData[i]);
}
}