keyctl.c

/*
 * Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "defs.h"

typedef int32_t key_serial_t;

#include "xlat/key_spec.h"

static void
print_keyring_serial_number(key_serial_t id)
{
	const char *str = xlookup(key_spec, (unsigned int) id);

	if (str)
		tprints(str);
	else
		tprintf("%d", id);
}

SYS_FUNC(add_key)
{
	/* type */
	printstr(tcp, tcp->u_arg[0], -1);
	/* description */
	tprints(", ");
	printstr(tcp, tcp->u_arg[1], -1);
	/* payload */
	tprints(", ");
	printstr(tcp, tcp->u_arg[2], tcp->u_arg[3]);
	/* payload length */
	tprintf(", %lu, ", tcp->u_arg[3]);
	/* keyring serial number */
	print_keyring_serial_number(tcp->u_arg[4]);

	return RVAL_DECODED;
}

SYS_FUNC(request_key)
{
	/* type */
	printstr(tcp, tcp->u_arg[0], -1);
	/* description */
	tprints(", ");
	printstr(tcp, tcp->u_arg[1], -1);
	/* callout_info */
	tprints(", ");
	printstr(tcp, tcp->u_arg[2], -1);
	/* keyring serial number */
	tprints(", ");
	print_keyring_serial_number(tcp->u_arg[3]);

	return RVAL_DECODED;
}

static void
keyctl_get_keyring_id(struct tcb *tcp, key_serial_t id, int create)
{
	print_keyring_serial_number(id);
	tprintf(", %d", create);
}

static void
keyctl_update_key(struct tcb *tcp, key_serial_t id, long addr, long len)
{
	print_keyring_serial_number(id);
	tprints(", ");
	printstr(tcp, addr, len);
	tprintf(", %lu", len);
}

static void
keyctl_handle_key_key(struct tcb *tcp, key_serial_t id1, key_serial_t id2)
{
	print_keyring_serial_number(id1);
	tprints(", ");
	print_keyring_serial_number(id2);
}

static void
keyctl_read_key(struct tcb *tcp, key_serial_t id, long addr, long len)
{
	if (entering(tcp)) {
		print_keyring_serial_number(id);
		tprints(", ");
	} else {
		if (syserror(tcp))
			printaddr(addr);
		else {
			long rval = tcp->u_rval > len ?
				    len : (tcp->u_rval ? -1 : 0);
			printstr(tcp, addr, rval);
		}
		tprintf(", %lu", len);
	}
}

static void
keyctl_keyring_search(struct tcb *tcp, key_serial_t id1, long addr1,
		      long addr2, key_serial_t id2)
{
	print_keyring_serial_number(id1);
	tprints(", ");
	printstr(tcp, addr1, -1);
	tprints(", ");
	printstr(tcp, addr2, -1);
	tprints(", ");
	print_keyring_serial_number(id2);
}

static void
keyctl_chown_key(struct tcb *tcp, key_serial_t id, int user, int group)
{
	print_keyring_serial_number(id);
	tprintf(", %d, %d", user, group);
}

static void
keyctl_instantiate_key(struct tcb *tcp, key_serial_t id1, long addr,
		       long len, key_serial_t id2)
{
	print_keyring_serial_number(id1);
	tprints(", ");
	printstr(tcp, addr, len);
	tprintf(", %lu, ", len);
	print_keyring_serial_number(id2);
}

static void
keyctl_instantiate_key_iov(struct tcb *tcp, key_serial_t id1,
			   long addr, long len, key_serial_t id2)
{
	print_keyring_serial_number(id1);
	tprints(", ");
	tprint_iov(tcp, len, addr, IOV_DECODE_STR);
	tprintf(", %lu, ", len);
	print_keyring_serial_number(id2);
}

static void
keyctl_negate_key(struct tcb *tcp, key_serial_t id1, unsigned timeout,
		  key_serial_t id2)
{
	print_keyring_serial_number(id1);
	tprintf(", %u, ", timeout);
	print_keyring_serial_number(id2);
}

static void
keyctl_reject_key(struct tcb *tcp, key_serial_t id1, unsigned timeout,
		  unsigned error, key_serial_t id2)
{
	print_keyring_serial_number(id1);
	tprintf(", %u, %u, ", timeout, error);
	print_keyring_serial_number(id2);
}

static void
keyctl_set_timeout(struct tcb *tcp, key_serial_t id, unsigned timeout)
{
	print_keyring_serial_number(id);
	tprintf(", %u", timeout);
}

static void
keyctl_get_persistent(struct tcb *tcp, int uid, key_serial_t id)
{
	tprintf("%d, ", uid);
	print_keyring_serial_number(id);
}

#include "xlat/key_perms.h"

static void
keyctl_setperm_key(struct tcb *tcp, key_serial_t id, uint32_t perm)
{
	print_keyring_serial_number(id);
	tprints(", ");
	printflags(key_perms, perm, "KEY_???");
}

#include "xlat/key_reqkeys.h"
#include "xlat/keyctl_commands.h"

SYS_FUNC(keyctl)
{
	int cmd = tcp->u_arg[0];

	if (entering(tcp)) {
		printxval(keyctl_commands, cmd, "KEYCTL_???");
		tprints(", ");
	}

	switch (cmd) {
	case KEYCTL_GET_KEYRING_ID:
		keyctl_get_keyring_id(tcp, tcp->u_arg[1], tcp->u_arg[2]);
		break;

	case KEYCTL_JOIN_SESSION_KEYRING:
		printstr(tcp, tcp->u_arg[1], -1);
		break;

	case KEYCTL_UPDATE:
		keyctl_update_key(tcp, tcp->u_arg[1],
				  tcp->u_arg[2], tcp->u_arg[3]);
		break;

	case KEYCTL_REVOKE:
	case KEYCTL_CLEAR:
	case KEYCTL_INVALIDATE:
	case KEYCTL_ASSUME_AUTHORITY:
		print_keyring_serial_number(tcp->u_arg[1]);
		break;

	case KEYCTL_LINK:
	case KEYCTL_UNLINK:
		keyctl_handle_key_key(tcp, tcp->u_arg[1], tcp->u_arg[2]);
		break;

	case KEYCTL_DESCRIBE:
	case KEYCTL_READ:
	case KEYCTL_GET_SECURITY:
		keyctl_read_key(tcp, tcp->u_arg[1],
				tcp->u_arg[2], tcp->u_arg[3]);
		return 0;

	case KEYCTL_SEARCH:
		keyctl_keyring_search(tcp, tcp->u_arg[1], tcp->u_arg[2],
				      tcp->u_arg[3], tcp->u_arg[4]);
		break;

	case KEYCTL_CHOWN:
		keyctl_chown_key(tcp, tcp->u_arg[1],
				 tcp->u_arg[2], tcp->u_arg[3]);
		break;

	case KEYCTL_SETPERM:
		keyctl_setperm_key(tcp, tcp->u_arg[1], tcp->u_arg[2]);
		break;

	case KEYCTL_INSTANTIATE:
		keyctl_instantiate_key(tcp, tcp->u_arg[1], tcp->u_arg[2],
				       tcp->u_arg[3], tcp->u_arg[4]);
		break;

	case KEYCTL_NEGATE:
		keyctl_negate_key(tcp, tcp->u_arg[1],
				  tcp->u_arg[2], tcp->u_arg[3]);
		break;

	case KEYCTL_SET_REQKEY_KEYRING:
		printxval(key_reqkeys, tcp->u_arg[1], "KEY_REQKEY_DEFL_???");
		break;

	case KEYCTL_SET_TIMEOUT:
		keyctl_set_timeout(tcp, tcp->u_arg[1], tcp->u_arg[2]);
		break;

	case KEYCTL_SESSION_TO_PARENT:
		break;

	case KEYCTL_REJECT:
		keyctl_reject_key(tcp, tcp->u_arg[1], tcp->u_arg[2],
				  tcp->u_arg[3], tcp->u_arg[4]);
		break;

	case KEYCTL_INSTANTIATE_IOV:
		keyctl_instantiate_key_iov(tcp, tcp->u_arg[1],
					   tcp->u_arg[2], tcp->u_arg[3],
					   tcp->u_arg[4]);
		break;

	case KEYCTL_GET_PERSISTENT:
		keyctl_get_persistent(tcp, tcp->u_arg[1], tcp->u_arg[2]);
		break;

	default:
		tprintf("%#lx, %#lx, %#lx, %#lx",
			tcp->u_arg[1], tcp->u_arg[2],
			tcp->u_arg[3], tcp->u_arg[4]);
		break;
	}

	return RVAL_DECODED;
}