84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
#define _GNU_SOURCE
|
|
#include <ioall.h>
|
|
#include <grp.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <pwd.h>
|
|
#include <sys/stat.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <sys/fsuid.h>
|
|
#include <gui-fatal.h>
|
|
#include <errno.h>
|
|
#include "filecopy.h"
|
|
#define INCOMING_DIR_ROOT "/home/user/incoming"
|
|
int prepare_creds_return_uid(char *username)
|
|
{
|
|
struct passwd *pwd;
|
|
pwd = getpwnam(username);
|
|
if (!pwd) {
|
|
perror("getpwnam");
|
|
exit(1);
|
|
}
|
|
setenv("HOME", pwd->pw_dir, 1);
|
|
setenv("USER", username, 1);
|
|
setgid(pwd->pw_gid);
|
|
initgroups(username, pwd->pw_gid);
|
|
setfsuid(pwd->pw_uid);
|
|
return pwd->pw_uid;
|
|
}
|
|
|
|
void wait_for_child(int statusfd)
|
|
{
|
|
int status;
|
|
if (read(statusfd, &status, sizeof status)!=sizeof status)
|
|
gui_fatal("File copy error: Internal error reading status from unpacker");
|
|
errno = status;
|
|
switch (status) {
|
|
case LEGAL_EOF: break;
|
|
case 0: gui_fatal("File copy: Connection terminated unexpectedly"); break;
|
|
case EINVAL: gui_fatal("File copy: Corrupted data from packer"); break;
|
|
case EEXIST: gui_fatal("File copy: not overwriting existing file. Clean ~/incoming, and retry copy"); break;
|
|
default: gui_fatal("File copy");
|
|
}
|
|
}
|
|
|
|
extern void do_unpack(int);
|
|
|
|
int main(int argc, char ** argv)
|
|
{
|
|
char *incoming_dir;
|
|
int pipefds[2];
|
|
int uid;
|
|
|
|
pipe(pipefds);
|
|
|
|
uid = prepare_creds_return_uid("user");
|
|
|
|
mkdir(INCOMING_DIR_ROOT, 0700);
|
|
asprintf(&incoming_dir, "%s/from-%s", INCOMING_DIR_ROOT, argv[1]);
|
|
mkdir(incoming_dir, 0700);
|
|
if (chdir(incoming_dir))
|
|
gui_fatal("Error chdir to %s", incoming_dir);
|
|
switch (fork()) {
|
|
case -1:
|
|
perror("fork");
|
|
exit(1);
|
|
case 0:
|
|
if (chroot(incoming_dir)) //impossible
|
|
gui_fatal("Error chroot to %s", incoming_dir);
|
|
setuid(uid);
|
|
close(pipefds[0]);
|
|
do_unpack(pipefds[1]);
|
|
exit(0);
|
|
default:;
|
|
}
|
|
|
|
setuid(uid);
|
|
close(pipefds[1]);
|
|
wait_for_child(pipefds[0]);
|
|
|
|
return 0;
|
|
}
|