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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/********************************************************************
* $Author: lindner $
* $Revision: 3.9 $
* $Date: 1996/01/04 18:30:01 $
* $Source: /home/arcwelder/GopherSrc/CVS/gopher+/gopherd/openers.c,v $
* $State: Exp $
*
* Paul Lindner, University of Minnesota CIS.
*
* Copyright 1991, 1992 by the Regents of the University of Minnesota
* see the file "Copyright" in the distribution for conditions of use.
*********************************************************************
* MODULE: openers.c
* See below
*********************************************************************
* Revision History:
* $Log: openers.c,v $
* Revision 3.9 1996/01/04 18:30:01 lindner
* Fix for Ustat on Linux
*
* Revision 3.8 1995/09/25 05:02:38 lindner
* Convert to ANSI C
*
* Revision 3.7 1995/04/15 07:11:22 lindner
* Put back static declaration
*
* Revision 3.6 1995/02/07 07:02:46 lindner
* performance fixes
*
* Revision 3.5 1993/09/18 03:26:17 lindner
* Important Security fix
*
* Revision 3.4 1993/07/27 05:27:54 lindner
* Mondo Debug overhaul from Mitra
*
* Revision 3.3 1993/04/09 16:23:12 lindner
* Additional debug stuff
*
* Revision 3.2 1993/02/19 21:22:05 lindner
* Fixed problems with non-chroot() use
*
* Revision 3.1.1.1 1993/02/11 18:02:52 lindner
* Gopher+1.2beta release
*
* Revision 1.2 1993/01/30 23:57:44 lindner
* Fixes so that opening a file doesn't depend on what the current
* directory is.
*
* Revision 1.1 1992/12/10 23:13:27 lindner
* gopher 1.1 release
*
*
*********************************************************************/
/*
* Routines that implement safe "openers" so that we can do without
* the chroot(). This is an advantage because then you can have
* symbolic links from your gopher server directory to other files
* that are elsewhere on your system, without (if we've done this right)
* compromising your security, or allowing access to any files that
* you don't want made available.
*
* The "r" in the names is meant to indicate "restricted".
* The "u" in the names is meant to indicate "unrestricted".
*/
#include "gopherd.h"
#include "Debug.h"
#include <sys/param.h> /* for MAXPATHLEN */
/* and restore our real names */
#undef open
#undef fopen
#undef stat
#undef opendir
#undef chdir
char *fixfile();
int
ropen(char *path, int flags, int mode)
{
char *p;
p = fixfile(path);
if (p != NULL)
return( open( p, flags, mode ) );
return(-1); /* failed */
}
FILE *
rfopen(char *filename, char *type)
{
char *p;
p = fixfile(filename);
if (p != NULL)
return( fopen( p, type ) );
return(NULL); /* failed */
}
int
rstat(char *path, struct stat *buf)
{
char *p;
p = fixfile(path);
if (p != NULL)
return( stat( p, buf ) );
return(-1); /* failed */
}
DIR *
ropendir(char *dirname)
{
char *p;
p = fixfile(dirname);
if (p != NULL)
return( opendir( p ) );
return(NULL); /* failed */
}
/*
* Restricted chdir.
*
* Change to Data_Dir first if it's an absolute path,
* then do a relative chdir from there....
*/
int
rchdir(char *path)
{
char *p;
p = fixfile(path);
Debug("Changing to directory %s\n", p);
return( chdir( p ) );
}
int
uopen(char *path, int flags, int mode)
{
return( open( path, flags, mode ) );
}
FILE *
ufopen(char *filename, char *type)
{
return( fopen( filename, type ) );
}
int
Ustat(char *path, struct stat *buf)
{
return( stat( path, buf ) );
}
DIR *
uopendir(char *dirname)
{
return( opendir( dirname ) );
}
int
uchdir(char *path)
{
Debug("Changing to directory %s\n", path);
return( chdir( path ) );
}
/* Make sure the pathname they gave us is safe and secure for use */
char *
fixfile(char *name)
{
static char newpathbuf[MAXPATHLEN];
char *newpath;
newpath = &newpathbuf[0];
if (!dochroot) {
strcpy(newpath, Data_Dir);
newpath += strlen(Data_Dir);
}
else {
strcpy(newpath, "/");
}
/* set errno to EPERM in case we reject the request */
errno = EPERM;
/*
** rip any .. or . entries out, so they can't sneak up out of
** the gopher directory. Need to use dedot2() so we don't clobber
** the string they sent us originally.
*/
dedot2(name,newpath);
if (*newpath == '/' || *newpath == '\0')
return(newpathbuf);
else
return(newpath);
}
|
