r24273: Fix bug #4817 by <mwallnoefer@yahoo.de>. (Unable to add a computer

from MMC Active Directory Users and Computers).

Windows sets a 14 UCS2 char buffer as the password in this case.

We need to allow random buffers to be accepted as complex passwords,
even if they don't have ASCII upper or lower case characters.  (If
half the bytes are > 127, then it's likely a random buffer).

Also make the test match the documented windows behaviour of '3 of the
4 classes: upper, lower, digit, special'.

Andrew Bartlett
(This used to be commit 5ef26a2ba3)

source4/lib/util/genrand.c

@@ -265,19 +265,24 @@ _PUBLIC_ uint32_t generate_random(void)
 **/
 _PUBLIC_ BOOL check_password_quality(const char *s)
 {
-	int has_digit=0, has_capital=0, has_lower=0;
+	int has_digit=0, has_capital=0, has_lower=0, has_special=0, has_high=0;
 	while (*s) {
 		if (isdigit((unsigned char)*s)) {
-			has_digit++;
+			has_digit |= 1;
 		} else if (isupper((unsigned char)*s)) {
-			has_capital++;
+			has_capital |= 1;
 		} else if (islower((unsigned char)*s)) {
-			has_lower++;
+			has_lower |= 1;
+		} else if (isascii((unsigned char)*s)) {
+			has_special |= 1;
+		} else {
+			has_high++;
 		}
 		s++;
 	}
 
-	return has_digit && has_lower && has_capital;
+	return ((has_digit + has_lower + has_capital + has_special) >= 3
+		|| (has_high > strlen(s)/2));
 }
 
 /**