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crypt32: Correctly match subdomains with dns name constraints.

This commit is contained in:
Juan Lang 2009-11-13 18:05:11 -08:00 committed by Alexandre Julliard
parent b74ef17efc
commit 1974e61b59
1 changed files with 27 additions and 1 deletions
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28
dlls/crypt32/chain.c
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@ -642,9 +642,35 @@ static BOOL dns_name_matches(LPCWSTR constraint, LPCWSTR name,
*trustErrorStatus |= CERT_TRUST_INVALID_NAME_CONSTRAINTS;
else if (!name)
; /* no match */
else if (lstrlenW(name) >= lstrlenW(constraint))
/* RFC 5280, section 4.2.1.10:
* "DNS name restrictions are expressed as host.example.com. Any DNS name
* that can be constructed by simply adding zero or more labels to the
* left-hand side of the name satisfies the name constraint. For example,
* www.host.example.com would satisfy the constraint but host1.example.com
* would not."
*/
else if (lstrlenW(name) == lstrlenW(constraint))
match = !lstrcmpiW(name, constraint);
else if (lstrlenW(name) > lstrlenW(constraint))
{
match = !lstrcmpiW(name + lstrlenW(name) - lstrlenW(constraint),
constraint);
if (match)
{
BOOL dot = FALSE;
LPCWSTR ptr;
/* This only matches if name is a subdomain of constraint, i.e.
* there's a '.' between the beginning of the name and the
* matching portion of the name.
*/
for (ptr = name + lstrlenW(name) - lstrlenW(constraint);
!dot && ptr >= name; ptr--)
if (*ptr == '.')
dot = TRUE;
match = dot;
}
}
/* else: name is too short, no match */
return match;