/[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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Annotation of /scripts/ifppc_up.setuid.cc

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Revision 1 - (hide annotations)
Wed Sep 5 17:11:21 2007 UTC (13 years, 3 months ago) by dpavlin
File size: 1985 byte(s)
import upstream CVS
1 dpavlin 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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