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net: Use netlink_ns_capable to verify the permisions of netlink messages

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It is possible by passing a netlink socket to a more privileged
executable and then to fool that executable into writing to the socket
data that happens to be valid netlink message to do something that
privileged executable did not intend to do.

To keep this from happening replace bare capable and ns_capable calls
with netlink_capable, netlink_net_calls and netlink_ns_capable calls.
Which act the same as the previous calls except they verify that the
opener of the socket had the desired permissions as well.

Reported-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2014-04-23 14:29:27 -07:00 committed by David S. Miller
parent aa4cf9452f
commit 90f62cf30a
19 changed files with 38 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
crypto/crypto_user.c
View File

@ -466,7 +466,7 @@ static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
type -= CRYPTO_MSG_BASE;
link = &crypto_dispatch[type];
if (!capable(CAP_NET_ADMIN))
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&

2
drivers/connector/cn_proc.c
View File

@ -369,7 +369,7 @@ static void cn_proc_mcast_ctl(struct cn_msg *msg,
return;
/* Can only change if privileged. */
if (!capable(CAP_NET_ADMIN)) {
if (!__netlink_ns_capable(nsp, &init_user_ns, CAP_NET_ADMIN)) {
err = EPERM;
goto out;
}

2
drivers/scsi/scsi_netlink.c
View File

@ -77,7 +77,7 @@ scsi_nl_rcv_msg(struct sk_buff *skb)
goto next_msg;
}
if (!capable(CAP_SYS_ADMIN)) {
if (!netlink_capable(skb, CAP_SYS_ADMIN)) {
err = -EPERM;
goto next_msg;
}

4
kernel/audit.c
View File

@ -643,13 +643,13 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
if ((task_active_pid_ns(current) != &init_pid_ns))
return -EPERM;
if (!capable(CAP_AUDIT_CONTROL))
if (!netlink_capable(skb, CAP_AUDIT_CONTROL))
err = -EPERM;
break;
case AUDIT_USER:
case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
if (!capable(CAP_AUDIT_WRITE))
if (!netlink_capable(skb, CAP_AUDIT_WRITE))
err = -EPERM;
break;
default: /* bad msg */

4
net/can/gw.c
View File

@ -804,7 +804,7 @@ static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh)
u8 limhops = 0;
int err = 0;
if (!capable(CAP_NET_ADMIN))
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (nlmsg_len(nlh) < sizeof(*r))
@ -893,7 +893,7 @@ static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh)
u8 limhops = 0;
int err = 0;
if (!capable(CAP_NET_ADMIN))
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (nlmsg_len(nlh) < sizeof(*r))

20
net/core/rtnetlink.c
View File

@ -1395,7 +1395,8 @@ static int do_set_master(struct net_device *dev, int ifindex)
return 0;
}
static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
static int do_setlink(const struct sk_buff *skb,
struct net_device *dev, struct ifinfomsg *ifm,
struct nlattr **tb, char *ifname, int modified)
{
const struct net_device_ops *ops = dev->netdev_ops;
@ -1407,7 +1408,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
err = PTR_ERR(net);
goto errout;
}
if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
err = -EPERM;
goto errout;
}
@ -1661,7 +1662,7 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
if (err < 0)
goto errout;
err = do_setlink(dev, ifm, tb, ifname, 0);
err = do_setlink(skb, dev, ifm, tb, ifname, 0);
errout:
return err;
}
@ -1778,7 +1779,8 @@ struct net_device *rtnl_create_link(struct net *net,
}
EXPORT_SYMBOL(rtnl_create_link);
static int rtnl_group_changelink(struct net *net, int group,
static int rtnl_group_changelink(const struct sk_buff *skb,
struct net *net, int group,
struct ifinfomsg *ifm,
struct nlattr **tb)
{
@ -1787,7 +1789,7 @@ static int rtnl_group_changelink(struct net *net, int group,
for_each_netdev(net, dev) {
if (dev->group == group) {
err = do_setlink(dev, ifm, tb, NULL, 0);
err = do_setlink(skb, dev, ifm, tb, NULL, 0);
if (err < 0)
return err;
}
@ -1929,12 +1931,12 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
modified = 1;
}
return do_setlink(dev, ifm, tb, ifname, modified);
return do_setlink(skb, dev, ifm, tb, ifname, modified);
}
if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
return rtnl_group_changelink(net,
return rtnl_group_changelink(skb, net,
nla_get_u32(tb[IFLA_GROUP]),
ifm, tb);
return -ENODEV;
@ -2321,7 +2323,7 @@ static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
int err = -EINVAL;
__u8 *addr;
if (!capable(CAP_NET_ADMIN))
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
@ -2773,7 +2775,7 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
sz_idx = type>>2;
kind = type&3;
if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN))
if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {

2
net/dcb/dcbnl.c
View File

@ -1669,7 +1669,7 @@ static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
struct nlmsghdr *reply_nlh = NULL;
const struct reply_func *fn;
if ((nlh->nlmsg_type == RTM_SETDCB) && !capable(CAP_NET_ADMIN))
if ((nlh->nlmsg_type == RTM_SETDCB) && !netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
ret = nlmsg_parse(nlh, sizeof(*dcb), tb, DCB_ATTR_MAX,

4
net/decnet/dn_dev.c
View File

@ -574,7 +574,7 @@ static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
struct dn_ifaddr __rcu **ifap;
int err = -EINVAL;
if (!capable(CAP_NET_ADMIN))
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (!net_eq(net, &init_net))
@ -618,7 +618,7 @@ static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
struct dn_ifaddr *ifa;
int err;
if (!capable(CAP_NET_ADMIN))
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (!net_eq(net, &init_net))

4
net/decnet/dn_fib.c
View File

@ -505,7 +505,7 @@ static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
struct nlattr *attrs[RTA_MAX+1];
int err;
if (!capable(CAP_NET_ADMIN))
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (!net_eq(net, &init_net))
@ -530,7 +530,7 @@ static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
struct nlattr *attrs[RTA_MAX+1];
int err;
if (!capable(CAP_NET_ADMIN))
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (!net_eq(net, &init_net))

2
net/decnet/netfilter/dn_rtmsg.c
View File

@ -107,7 +107,7 @@ static inline void dnrmg_receive_user_skb(struct sk_buff *skb)
if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
return;
if (!capable(CAP_NET_ADMIN))
if (!netlink_capable(skb, CAP_NET_ADMIN))
RCV_SKB_FAIL(-EPERM);
/* Eventually we might send routing messages too */

2
net/netfilter/nfnetlink.c
View File

@ -375,7 +375,7 @@ static void nfnetlink_rcv(struct sk_buff *skb)
skb->len < nlh->nlmsg_len)
return;
if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
if (!netlink_net_capable(skb, CAP_NET_ADMIN)) {
netlink_ack(skb, nlh, -EPERM);
return;
}

2
net/netlink/genetlink.c
View File

@ -561,7 +561,7 @@ static int genl_family_rcv_msg(struct genl_family *family,
return -EOPNOTSUPP;
if ((ops->flags & GENL_ADMIN_PERM) &&
!capable(CAP_NET_ADMIN))
!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {

2
net/packet/diag.c
View File

@ -194,7 +194,7 @@ static int packet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
net = sock_net(skb->sk);
req = nlmsg_data(cb->nlh);
may_report_filterinfo = ns_capable(net->user_ns, CAP_NET_ADMIN);
may_report_filterinfo = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
mutex_lock(&net->packet.sklist_lock);
sk_for_each(sk, &net->packet.sklist) {

8
net/phonet/pn_netlink.c
View File

@ -70,10 +70,10 @@ static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
int err;
u8 pnaddr;
if (!capable(CAP_NET_ADMIN))
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (!capable(CAP_SYS_ADMIN))
if (!netlink_capable(skb, CAP_SYS_ADMIN))
return -EPERM;
ASSERT_RTNL();
@ -233,10 +233,10 @@ static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
int err;
u8 dst;
if (!capable(CAP_NET_ADMIN))
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (!capable(CAP_SYS_ADMIN))
if (!netlink_capable(skb, CAP_SYS_ADMIN))
return -EPERM;
ASSERT_RTNL();

2
net/sched/act_api.c
View File

@ -948,7 +948,7 @@ static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
u32 portid = skb ? NETLINK_CB(skb).portid : 0;
int ret = 0, ovr = 0;
if ((n->nlmsg_type != RTM_GETACTION) && !capable(CAP_NET_ADMIN))
if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);

2
net/sched/cls_api.c
View File

@ -134,7 +134,7 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
int err;
int tp_created = 0;
if ((n->nlmsg_type != RTM_GETTFILTER) && !capable(CAP_NET_ADMIN))
if ((n->nlmsg_type != RTM_GETTFILTER) && !netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
replay:

6
net/sched/sch_api.c
View File

@ -1084,7 +1084,7 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
struct Qdisc *p = NULL;
int err;
if ((n->nlmsg_type != RTM_GETQDISC) && !capable(CAP_NET_ADMIN))
if ((n->nlmsg_type != RTM_GETQDISC) && !netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
@ -1151,7 +1151,7 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
struct Qdisc *q, *p;
int err;
if (!capable(CAP_NET_ADMIN))
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
replay:
@ -1490,7 +1490,7 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n)
u32 qid;
int err;
if ((n->nlmsg_type != RTM_GETTCLASS) && !capable(CAP_NET_ADMIN))
if ((n->nlmsg_type != RTM_GETTCLASS) && !netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);

2
net/tipc/netlink.c
View File

@ -47,7 +47,7 @@ static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
int hdr_space = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
u16 cmd;
if ((req_userhdr->cmd & 0xC000) && (!capable(CAP_NET_ADMIN)))
if ((req_userhdr->cmd & 0xC000) && (!netlink_capable(skb, CAP_NET_ADMIN)))
cmd = TIPC_CMD_NOT_NET_ADMIN;
else
cmd = req_userhdr->cmd;

2
net/xfrm/xfrm_user.c
View File

@ -2377,7 +2377,7 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
link = &xfrm_dispatch[type];
/* All operations require privileges, even GET */
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
if (!netlink_net_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||