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
|
/*
* Windows support module which deals with being a named-pipe client.
*/
#include <stdio.h>
#include <assert.h>
#include "tree234.h"
#include "putty.h"
#include "network.h"
#include "proxy/proxy.h"
#include "ssh.h"
#include "security-api.h"
HANDLE connect_to_named_pipe(const char *pipename, char **err)
{
HANDLE pipehandle;
PSID usersid, pipeowner;
PSECURITY_DESCRIPTOR psd;
assert(strncmp(pipename, "\\\\.\\pipe\\", 9) == 0);
assert(strchr(pipename + 9, '\\') == NULL);
while (1) {
pipehandle = CreateFile(pipename, GENERIC_READ | GENERIC_WRITE,
0, NULL, OPEN_EXISTING,
FILE_FLAG_OVERLAPPED, NULL);
if (pipehandle != INVALID_HANDLE_VALUE)
break;
if (GetLastError() != ERROR_PIPE_BUSY) {
*err = dupprintf(
"Unable to open named pipe '%s': %s",
pipename, win_strerror(GetLastError()));
return INVALID_HANDLE_VALUE;
}
/*
* If we got ERROR_PIPE_BUSY, wait for the server to create a
* new pipe instance. (Since the server is expected to be
* named-pipe-server.c, which will do that immediately after a
* previous connection is accepted, that shouldn't take
* excessively long.)
*/
if (!WaitNamedPipe(pipename, NMPWAIT_USE_DEFAULT_WAIT)) {
*err = dupprintf(
"Error waiting for named pipe '%s': %s",
pipename, win_strerror(GetLastError()));
return INVALID_HANDLE_VALUE;
}
}
if ((usersid = get_user_sid()) == NULL) {
CloseHandle(pipehandle);
*err = dupprintf(
"Unable to get user SID: %s", win_strerror(GetLastError()));
return INVALID_HANDLE_VALUE;
}
if (p_GetSecurityInfo(pipehandle, SE_KERNEL_OBJECT,
OWNER_SECURITY_INFORMATION,
&pipeowner, NULL, NULL, NULL,
&psd) != ERROR_SUCCESS) {
CloseHandle(pipehandle);
*err = dupprintf(
"Unable to get named pipe security information: %s",
win_strerror(GetLastError()));
return INVALID_HANDLE_VALUE;
}
if (!EqualSid(pipeowner, usersid)) {
CloseHandle(pipehandle);
LocalFree(psd);
*err = dupprintf(
"Owner of named pipe '%s' is not us", pipename);
return INVALID_HANDLE_VALUE;
}
LocalFree(psd);
return pipehandle;
}
Socket *new_named_pipe_client(const char *pipename, Plug *plug)
{
char *err = NULL;
HANDLE pipehandle = connect_to_named_pipe(pipename, &err);
if (pipehandle == INVALID_HANDLE_VALUE)
return new_error_socket_consume_string(plug, err);
else
return make_handle_socket(pipehandle, pipehandle, NULL, NULL, 0,
plug, true);
}
|
