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chroot

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This commit is contained in:
Bjorn Andersson 2006-06-11 14:29:36 +00:00
parent ccae5695c0
commit b7dc8a3779
2 changed files with 39 additions and 16 deletions
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28
iodine.c
View file

@ -105,14 +105,16 @@ extern char *__progname;
static void static void
usage() { usage() {
printf("Usage: %s [-v] [-h] [-f] [-u user] nameserver topdomain\n", __progname); printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] "
"nameserver topdomain\n", __progname);
exit(2); exit(2);
} }
static void static void
help() { help() {
printf("iodine IP over DNS tunneling client\n"); printf("iodine IP over DNS tunneling client\n");
printf("Usage: %s [-v] [-h] [-f] [-u user] nameserver topdomain\n", __progname); printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] "
"nameserver topdomain\n", __progname);
printf(" -f is to keep running in foreground\n"); printf(" -f is to keep running in foreground\n");
printf(" -u name to drop privileges and run as user 'name'\n"); printf(" -u name to drop privileges and run as user 'name'\n");
exit(0); exit(0);
@ -129,17 +131,18 @@ version() {
int int
main(int argc, char **argv) main(int argc, char **argv)
{ {
int choice;
int tun_fd; int tun_fd;
int dns_fd; int dns_fd;
int choice; char *newroot;
char *username; char *username;
struct passwd *pw;
int foreground; int foreground;
struct passwd *pw;
username = NULL; username = NULL;
foreground = 0; foreground = 0;
while ((choice = getopt(argc, argv, "vfhu:")) != -1) { while ((choice = getopt(argc, argv, "vfhu:t:")) != -1) {
switch(choice) { switch(choice) {
case 'v': case 'v':
version(); version();
@ -153,9 +156,12 @@ main(int argc, char **argv)
case 'u': case 'u':
username = optarg; username = optarg;
break; break;
case 't':
newroot = optarg;
break;
default: default:
usage(); usage();
break; /* NOTREACHED */
} }
} }
@ -167,9 +173,8 @@ main(int argc, char **argv)
argc -= optind; argc -= optind;
argv += optind; argv += optind;
if (argc != 2) { if (argc != 2)
usage(); usage();
}
if(username) { if(username) {
pw = getpwnam(username); pw = getpwnam(username);
@ -184,6 +189,13 @@ main(int argc, char **argv)
signal(SIGINT, sigint); signal(SIGINT, sigint);
if (newroot) {
if (chroot(newroot) != 0 || chdir("/") != 0)
err(1, "%s", newroot);
seteuid(geteuid());
setuid(getuid());
}
if (!foreground) { if (!foreground) {
daemon(0, 0); daemon(0, 0);
umask(0); umask(0);

27
iodined.c
View file

@ -108,14 +108,15 @@ extern char *__progname;
static void static void
usage() { usage() {
printf("Usage: %s [-v] [-h] [-f] [-u user] topdomain\n", __progname); printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] topdomain\n", __progname);
exit(2); exit(2);
} }
static void static void
help() { help() {
printf("iodine IP over DNS tunneling server\n"); printf("iodine IP over DNS tunneling server\n");
printf("Usage: %s [-v] [-h] [-f] [-u user] topdomain\n", __progname); printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] "
"topdomain\n", __progname);
printf(" -f to keep running in foreground\n"); printf(" -f to keep running in foreground\n");
printf(" -u name to drop privileges and run as user 'name'\n"); printf(" -u name to drop privileges and run as user 'name'\n");
exit(0); exit(0);
@ -132,17 +133,18 @@ version() {
int int
main(int argc, char **argv) main(int argc, char **argv)
{ {
int choice;
int tun_fd; int tun_fd;
int dnsd_fd; int dnsd_fd;
int choice; char *newroot;
char *username; char *username;
struct passwd *pw;
int foreground; int foreground;
struct passwd *pw;
username = NULL; username = NULL;
foreground = 0; foreground = 0;
while ((choice = getopt(argc, argv, "vfhu:")) != -1) { while ((choice = getopt(argc, argv, "vfhu:t:")) != -1) {
switch(choice) { switch(choice) {
case 'v': case 'v':
version(); version();
@ -156,9 +158,12 @@ main(int argc, char **argv)
case 'u': case 'u':
username = optarg; username = optarg;
break; break;
case 't':
newroot = optarg;
break;
default: default:
usage(); usage();
break; /* NOTREACHED */
} }
} }
@ -170,9 +175,8 @@ main(int argc, char **argv)
usage(); usage();
} }
if (argc != 1) { if (argc != 1)
usage(); usage();
}
if (username) { if (username) {
pw = getpwnam(username); pw = getpwnam(username);
@ -185,6 +189,13 @@ main(int argc, char **argv)
tun_fd = open_tun(); tun_fd = open_tun();
dnsd_fd = open_dnsd(argv[0]); dnsd_fd = open_dnsd(argv[0]);
if (newroot) {
if (chroot(newroot) != 0 || chdir("/") != 0)
err(1, "%s", newroot);
seteuid(geteuid());
setuid(getuid());
}
if (!foreground) { if (!foreground) {
daemon(0, 0); daemon(0, 0);
umask(0); umask(0);