105 lines
2.3 KiB
C
105 lines
2.3 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 DEFAULT_MAX_UPDATES_BYTES (2L<<30)
|
|
#define DEFAULT_MAX_UPDATES_FILES 2048
|
|
|
|
int prepare_creds_return_uid(char *username)
|
|
{
|
|
struct passwd *pwd;
|
|
// First try name
|
|
pwd = getpwnam(username);
|
|
if (!pwd) {
|
|
// Then try UID
|
|
pwd = getpwuid(atoi(username));
|
|
if (!pwd) {
|
|
perror("getpwuid");
|
|
exit(1);
|
|
}
|
|
}
|
|
setenv("HOME", pwd->pw_dir, 1);
|
|
setenv("USER", pwd->pw_name, 1);
|
|
setgid(pwd->pw_gid);
|
|
initgroups(pwd->pw_name, 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;
|
|
char *var;
|
|
long long files_limit = DEFAULT_MAX_UPDATES_FILES;
|
|
long long bytes_limit = DEFAULT_MAX_UPDATES_BYTES;
|
|
|
|
if (argc < 3) {
|
|
fprintf(stderr, "Invalid parameters, usage: %s user dir\n", argv[0]);
|
|
exit(1);
|
|
}
|
|
|
|
if ((var=getenv("UPDATES_MAX_BYTES")))
|
|
bytes_limit = atoll(var);
|
|
if ((var=getenv("UPDATES_MAX_FILES")))
|
|
files_limit = atoll(var);
|
|
|
|
pipe(pipefds);
|
|
|
|
uid = prepare_creds_return_uid(argv[1]);
|
|
|
|
incoming_dir = argv[2];
|
|
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]);
|
|
set_size_limit(bytes_limit, files_limit);
|
|
do_unpack(pipefds[1]);
|
|
exit(0);
|
|
default:;
|
|
}
|
|
|
|
setuid(uid);
|
|
close(pipefds[1]);
|
|
wait_for_child(pipefds[0]);
|
|
|
|
return 0;
|
|
}
|