1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/*-------------------------------------------------------------------------
*
* win32security.c
* Microsoft Windows Win32 Security Support Functions
*
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/port/win32security.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
/*
* Utility wrapper for frontend and backend when reporting an error
* message.
*/
static
pg_attribute_printf(1, 2)
void
log_error(const char *fmt,...)
{
va_list ap;
va_start(ap, fmt);
#ifndef FRONTEND
write_stderr(fmt, ap);
#else
fprintf(stderr, fmt, ap);
#endif
va_end(ap);
}
/*
* Returns nonzero if the current user has administrative privileges,
* or zero if not.
*
* Note: this cannot use ereport() because it's called too early during
* startup.
*/
int
pgwin32_is_admin(void)
{
PSID AdministratorsSid;
PSID PowerUsersSid;
SID_IDENTIFIER_AUTHORITY NtAuthority = {SECURITY_NT_AUTHORITY};
BOOL IsAdministrators;
BOOL IsPowerUsers;
if (!AllocateAndInitializeSid(&NtAuthority, 2,
SECURITY_BUILTIN_DOMAIN_RID,
DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0,
0, &AdministratorsSid))
{
log_error(_("could not get SID for Administrators group: error code %lu\n"),
GetLastError());
exit(1);
}
if (!AllocateAndInitializeSid(&NtAuthority, 2,
SECURITY_BUILTIN_DOMAIN_RID,
DOMAIN_ALIAS_RID_POWER_USERS, 0, 0, 0, 0, 0,
0, &PowerUsersSid))
{
log_error(_("could not get SID for PowerUsers group: error code %lu\n"),
GetLastError());
exit(1);
}
if (!CheckTokenMembership(NULL, AdministratorsSid, &IsAdministrators) ||
!CheckTokenMembership(NULL, PowerUsersSid, &IsPowerUsers))
{
log_error(_("could not check access token membership: error code %lu\n"),
GetLastError());
exit(1);
}
FreeSid(AdministratorsSid);
FreeSid(PowerUsersSid);
if (IsAdministrators || IsPowerUsers)
return 1;
else
return 0;
}
/*
* We consider ourselves running as a service if one of the following is
* true:
*
* 1) We are running as LocalSystem (only used by services)
* 2) Our token contains SECURITY_SERVICE_RID (automatically added to the
* process token by the SCM when starting a service)
*
* The check for LocalSystem is needed, because surprisingly, if a service
* is running as LocalSystem, it does not have SECURITY_SERVICE_RID in its
* process token.
*
* Return values:
* 0 = Not service
* 1 = Service
* -1 = Error
*
* Note: we can't report errors via either ereport (we're called too early
* in the backend) or write_stderr (because that calls this). We are
* therefore reduced to writing directly on stderr, which sucks, but we
* have few alternatives.
*/
int
pgwin32_is_service(void)
{
static int _is_service = -1;
BOOL IsMember;
PSID ServiceSid;
PSID LocalSystemSid;
SID_IDENTIFIER_AUTHORITY NtAuthority = {SECURITY_NT_AUTHORITY};
/* Only check the first time */
if (_is_service != -1)
return _is_service;
/* First check for LocalSystem */
if (!AllocateAndInitializeSid(&NtAuthority, 1,
SECURITY_LOCAL_SYSTEM_RID, 0, 0, 0, 0, 0, 0, 0,
&LocalSystemSid))
{
fprintf(stderr, "could not get SID for local system account\n");
return -1;
}
if (!CheckTokenMembership(NULL, LocalSystemSid, &IsMember))
{
fprintf(stderr, "could not check access token membership: error code %lu\n",
GetLastError());
FreeSid(LocalSystemSid);
return -1;
}
FreeSid(LocalSystemSid);
if (IsMember)
{
_is_service = 1;
return _is_service;
}
/* Check for service group membership */
if (!AllocateAndInitializeSid(&NtAuthority, 1,
SECURITY_SERVICE_RID, 0, 0, 0, 0, 0, 0, 0,
&ServiceSid))
{
fprintf(stderr, "could not get SID for service group: error code %lu\n",
GetLastError());
return -1;
}
if (!CheckTokenMembership(NULL, ServiceSid, &IsMember))
{
fprintf(stderr, "could not check access token membership: error code %lu\n",
GetLastError());
FreeSid(ServiceSid);
return -1;
}
FreeSid(ServiceSid);
if (IsMember)
_is_service = 1;
else
_is_service = 0;
return _is_service;
}
|
