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Fix loading of SSPICLI.DLL by SECUR32.DLL.

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If MIT Kerberos is installed, then using GetProcAddress to extract
GetUserNameExA() from secur32.dll causes Windows to implicitly load
sspicli.dll in turn - and it does it in a search-path-unclean way.

If we load it in our own way before that happens, then Windows doesn't
need to load it again and won't do so wrongly.

[SGT: tidied up commit message from original patch]
This commit is contained in:
Christopher Odenbach 2017-04-11 14:04:00 +02:00 committed by Simon Tatham
parent 802b4edf4d
commit 3ff3be3882
1 changed files with 5 additions and 0 deletions
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5
windows/winmisc.c
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@ -101,6 +101,11 @@ char *get_username(void)
if (!tried_usernameex) {
/* Not available on Win9x, so load dynamically */
HMODULE secur32 = load_system32_dll("secur32.dll");
/* If MIT Kerberos is installed, the following call to
GET_WINDOWS_FUNCTION makes Windows implicitly load
sspicli.dll WITHOUT proper path sanitizing, so better
load it properly before */
HMODULE sspicli = load_system32_dll("sspicli.dll");
GET_WINDOWS_FUNCTION(secur32, GetUserNameExA);
tried_usernameex = TRUE;
}