-int is_safe_path(const char *file)
-{
- char *p;
- const char *f;
- char x;
- struct stat s;
- char l[MAXBUFSIZE];
-
- if(*file != '/')
- {
- syslog(LOG_ERR, _("`%s' is not an absolute path"), file);
- return 0;
- }
-
- p = strrchr(file, '/');
-
- if(p == file) /* It's in the root */
- p++;
-
- x = *p;
- *p = '\0';
-
- f = file;
-check1:
- if(lstat(f, &s) < 0)
- {
- syslog(LOG_ERR, _("Couldn't stat `%s': %m"),
- f);
- return 0;
- }
-
- if(s.st_uid != geteuid())
- {
- syslog(LOG_ERR, _("`%s' is owned by UID %d instead of %d"),
- f, s.st_uid, geteuid());
- return 0;
- }
-
- if(S_ISLNK(s.st_mode))
- {
- syslog(LOG_WARNING, _("Warning: `%s' is a symlink"),
- f);
-
- if(readlink(f, l, MAXBUFSIZE) < 0)
- {
- syslog(LOG_ERR, _("Unable to read symbolic link `%s': %m"), f);
- return 0;
- }
-
- f = l;
- goto check1;
- }
-
- *p = x;
- f = file;
-
-check2:
- if(lstat(f, &s) < 0 && errno != ENOENT)
- {
- syslog(LOG_ERR, _("Couldn't stat `%s': %m"),
- f);
- return 0;
- }
-
- if(errno == ENOENT)
- return 1;
-
- if(s.st_uid != geteuid())
- {
- syslog(LOG_ERR, _("`%s' is owned by UID %d instead of %d"),
- f, s.st_uid, geteuid());
- return 0;
- }
-
- if(S_ISLNK(s.st_mode))
- {
- syslog(LOG_WARNING, _("Warning: `%s' is a symlink"),
- f);
-
- if(readlink(f, l, MAXBUFSIZE) < 0)
- {
- syslog(LOG_ERR, _("Unable to read symbolic link `%s': %m"), f);
- return 0;
- }
-
- f = l;
- goto check2;
- }
-
- if(s.st_mode & 0007)
- {
- /* Accessible by others */
- syslog(LOG_ERR, _("`%s' has unsecure permissions"),
- f);
- return 0;
- }
-
- return 1;
-}