test/src/checkaccess.c

   1 /* $Cambridge: exim/test/src/checkaccess.c,v 1.1 2006/02/06 16:24:05 ph10 Exp $ */
   2
   3 /* This is a baby program that is run as root from the runtest script. It is
   4 passed the Exim uid and gid as arguments, and the name of a file in the
   5 test-suite directory. It gives up all supplementary groups, changes to the
   6 given uid/gid, and then tries to read the file. The yield is 0 if that is
   7 successful, and non-zero otherwise (use different values to aid debugging). See
   8 comments in the exim.c source file about the use of setgroups() for getting rid
   9 of extraneous groups. */
  10
  11 #include <sys/types.h>
  12 #include <sys/stat.h>
  13 #include <fcntl.h>
  14 #include <unistd.h>
  15 #include <pwd.h>
  16 #include <grp.h>
  17
  18 #include <stdio.h>
  19
  20
  21 int main(int argc, char **argv)
  22 {
  23 int fd;
  24 gid_t group_list[10];
  25 struct passwd *pw = getpwnam(argv[2]);
  26 struct group *gr = getgrnam(argv[3]);
  27
  28 if (pw == NULL) return 1;
  29 if (gr == NULL) return 2;
  30 if (setgroups(0, NULL) != 0 && setgroups(1, group_list) != 0) return 4;
  31 if (setgid(gr->gr_gid) != 0) return 5;
  32 if (setuid(pw->pw_uid) != 0) return 6;
  33
  34 fd = open(argv[1], O_RDONLY);
  35 if (fd < 0) return 7;
  36
  37 close(fd);
  38 return 0;
  39 }
  40
  41 /* End */