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
|
/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include <stdio.h>
#include <errno.h>
#ifndef _MSC_VER // this header file does not exist for the microsoft compiler
#include <unistd.h>
#endif
#include <string>
using std::string;
#include "LuaIO.h"
#if !defined UNITSYNC && !defined DEDICATED && !defined BUILDING_AI
#include "LuaHandle.h"
#endif // !defined UNITSYNC && !defined DEDICATED && !defined BUILDING_AI
#include "LuaInclude.h"
#include "System/FileSystem/DataDirsAccess.h"
#include "System/FileSystem/FileSystem.h"
#include "System/Util.h"
/******************************************************************************/
/******************************************************************************/
static bool IsSafePath(const string& path)
{
// keep searches within the Spring directory
if ((path[0] == '/') || (path[0] == '\\') ||
((path.size() >= 2) && (path[1] == ':'))) {
return false;
}
if ((path.find("..") != string::npos) ||
(path.find("springsettings.cfg") != string::npos) || //don't allow to change config file
(path.find(".springrc") != string::npos) ||
(path.find("springrc") != string::npos)
) {
return false;
}
return true;
}
/******************************************************************************/
/******************************************************************************/
bool LuaIO::IsSimplePath(const string& path)
{
// keep searches within the Spring directory
if ((path[0] == '/') || (path[0] == '\\') ||
((path.size() >= 2) && (path[1] == ':'))) {
return false;
}
if (path.find("..") != string::npos) {
return false;
}
return true;
}
bool LuaIO::SafeExecPath(const string& path)
{
return false; // don't allow execution of external programs, yet
}
bool LuaIO::SafeReadPath(const string& path)
{
return dataDirsAccess.InReadDir(path);
}
bool LuaIO::SafeWritePath(const string& path)
{
const size_t numExtensions = 5;
const char* exeFiles[numExtensions] = {"exe", "dll", "so", "bat", "com"};
const string ext = FileSystem::GetExtension(path);
for (size_t i = 0; i < numExtensions; ++i)
{
if (ext == exeFiles[i])
return false;
}
return dataDirsAccess.InWriteDir(path);
}
/******************************************************************************/
/******************************************************************************/
FILE* LuaIO::fopen(lua_State* L, const char* path, const char* mode)
{
// check the mode string
const string modeStr = StringToLower(mode);
if (modeStr.find_first_not_of("rwabt+") != string::npos) {
errno = EINVAL;
return NULL;
}
if (!IsSafePath(path)) {
errno = EPERM; //EACCESS?
return NULL;
}
return ::fopen(path, mode);
}
FILE* LuaIO::popen(lua_State* L, const char* command, const char* type)
{
// check the type string
const string typeStr = StringToLower(type);
if (typeStr.find_first_not_of("rw") != string::npos) {
errno = EINVAL;
return NULL;
}
errno = EINVAL;
return NULL;
}
int LuaIO::pclose(lua_State* L, FILE* stream)
{
errno = ECHILD;
return -1;
}
int LuaIO::system(lua_State* L, const char* command)
{
luaL_error(L, "the system() call is not available");
return -1; //
}
int LuaIO::remove(lua_State* L, const char* pathname)
{
if (!SafeWritePath(pathname)
|| !IsSafePath(pathname)) {
errno = EPERM; //EACCESS?
return -1;
}
return ::remove(pathname);
}
int LuaIO::rename(lua_State* L, const char* oldpath, const char* newpath)
{
if (!SafeWritePath(oldpath) || !SafeWritePath(newpath)
|| !IsSafePath(oldpath) || !IsSafePath(newpath)) {
errno = EPERM; //EACCESS?
return -1;
}
return ::rename(oldpath, newpath);
}
/******************************************************************************/
/******************************************************************************/
|
