/[pearpc]/scripts/ifppc_up.setuid.cc
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /scripts/ifppc_up.setuid.cc

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Revision 1 - (show annotations)
Wed Sep 5 17:11:21 2007 UTC (12 years, 2 months ago) by dpavlin
File size: 1985 byte(s)
import upstream CVS
1 #include <errno.h>
2 #include <string.h>
3 #include <sys/types.h>
4 #include <sys/stat.h>
5 #include <stdio.h>
6 #include <unistd.h>
7
8 int canonicalize(char *buf, int bufsize, char *cwd, char *fn)
9 {
10 int cwdsize = strlen(cwd);
11 int fnsize = strlen(fn);
12 if (fn[0] == '/') {
13 if (fnsize +1 > bufsize) return ERANGE;
14 strcpy(buf, fn);
15 return 0;
16 }
17 if (cwdsize + 1 + fnsize + 1 > bufsize) return ERANGE;
18 strcpy(buf, cwd);
19 strcat(buf, "/");
20 strcat(buf, fn);
21 return 0;
22 }
23
24 int main(int argc, char *argv[])
25 {
26 setuid(0);
27 char *relfilename = "ifppc_up";
28 int relfilenamesize = strlen(relfilename);
29 char cwdbuf[2048];
30 if (!getcwd(cwdbuf, sizeof cwdbuf)) {
31 printf("CWD name too long (>%d bytes). move to a higher level directory.\n", (int)sizeof cwdbuf);
32 return 1;
33 }
34 char filename[2048+128];
35 if (canonicalize(filename, sizeof filename, cwdbuf, argv[0])) {
36 printf("unable to determine absolute executable filename. "
37 "probably absolute filename too long (>%d bytes). "
38 "move to a higher level directory.\n", (int)sizeof cwdbuf);
39 return 1;
40 }
41 char *bs = strrchr(filename, '/');
42 if (!bs) {
43 printf("???\n");
44 return 1;
45 }
46 int pathsize = bs-filename;
47 if (pathsize + 1 + relfilenamesize + 1 > sizeof filename) {
48 printf("absolute pathname too long (>%d bytes). "
49 "move to a higher level directory.\n", (int)sizeof cwdbuf);
50 return 1;
51 }
52 strcpy(bs+1, relfilename);
53 // printf("filename = %s, uid=%d, euid=%d\n", filename, getuid(), geteuid());
54 struct stat s;
55 if (stat(filename, &s)) {
56 printf("can't stat file '%s': %s\n", filename, strerror(errno));
57 return 1;
58 }
59 if (s.st_uid != 0) {
60 printf("script '%s' must be owned by root (UID %d instead)\n", filename, s.st_uid);
61 return 1;
62 }
63 if (s.st_mode & S_IWGRP) {
64 printf("script '%s' must not be group-writable\n", filename);
65 return 1;
66 }
67 if (s.st_mode & S_IWOTH) {
68 printf("script '%s' must not be world-writable\n", filename);
69 return 1;
70 }
71 execl("/bin/sh", "/bin/sh", filename, (char*)NULL);
72 return 0;
73 }

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