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Replace load of functions by direct calls for some WIN32

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This commit changes the following code paths to do direct system calls
to some WIN32 functions rather than loading them from an external
library, shaving some code in the process:
- Creation of restricted tokens in pg_ctl.c, introduced by a25cd81.
- QuerySecurityContextToken() in auth.c for SSPI authentication in the
backend, introduced in d602592.
- CreateRestrictedToken() in src/common/.  This change is similar to the
case of pg_ctl.c.

Most of these functions were loaded rather than directly called because,
as mentioned in the code comments, MinGW headers were not declaring
them.  I have double-checked the recent MinGW code, and all the
functions changed here are declared in its headers, so this change
should be safe.  Note that I do not have a MinGW environment at hand so
I have not tested it directly, but that MSVC was fine with the change.
The buildfarm will tell soon enough if this change is appropriate or not
for a much broader set of environments.

A few code paths still use GetProcAddress() to load some functions:
- LDAP authentication for ldap_start_tls_sA(), where I am not confident
that this change would work.
- win32env.c and win32ntdll.c where we have a per-MSVC version
dependency for the name of the library loaded.
- crashdump.c for MiniDumpWriteDump() and EnumDirTree(), where direct
calls were not able to work after testing.

Reported-by: Thomas Munro
Reviewed-by: Justin Prysby
Discussion: https://postgr.es/m/CA+hUKG+BMdcaCe=P-EjMoLTCr3zrrzqbcVE=8h5LyNsSVHKXZA@mail.gmail.com
This commit is contained in:
Michael Paquier
2022-09-09 10:52:17 +09:00
parent df4a056619
commit 47bd0b3fa6
3 changed files with 48 additions and 159 deletions
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29
src/backend/libpq/auth.c
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@@ -1201,11 +1201,8 @@ pg_SSPI_recvauth(Port *port)
DWORD accountnamesize = sizeof(accountname);
DWORD domainnamesize = sizeof(domainname);
SID_NAME_USE accountnameuse;
HMODULE secur32;
char *authn_id;
QUERY_SECURITY_CONTEXT_TOKEN_FN _QuerySecurityContextToken;
/*
* Acquire a handle to the server credentials.
*/
@@ -1358,36 +1355,12 @@ pg_SSPI_recvauth(Port *port)
*
* Get the name of the user that authenticated, and compare it to the pg
* username that was specified for the connection.
*
* MingW is missing the export for QuerySecurityContextToken in the
* secur32 library, so we have to load it dynamically.
*/
secur32 = LoadLibrary("SECUR32.DLL");
if (secur32 == NULL)
ereport(ERROR,
(errmsg("could not load library \"%s\": error code %lu",
"SECUR32.DLL", GetLastError())));
_QuerySecurityContextToken = (QUERY_SECURITY_CONTEXT_TOKEN_FN) (pg_funcptr_t)
GetProcAddress(secur32, "QuerySecurityContextToken");
if (_QuerySecurityContextToken == NULL)
{
FreeLibrary(secur32);
ereport(ERROR,
(errmsg_internal("could not locate QuerySecurityContextToken in secur32.dll: error code %lu",
GetLastError())));
}
r = (_QuerySecurityContextToken) (sspictx, &token);
r = QuerySecurityContextToken(sspictx, &token);
if (r != SEC_E_OK)
{
FreeLibrary(secur32);
pg_SSPI_error(ERROR,
_("could not get token from SSPI security context"), r);
}
FreeLibrary(secur32);
/*
* No longer need the security context, everything from here on uses the