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Message-ID: <53DABDE0.6000108@cumulusnetworks.com>
Date: Thu, 31 Jul 2014 18:06:24 -0400
From: Jonathan Toppins <jtoppins@...ulusnetworks.com>
To: Wangyufen <wangyufen@...wei.com>, davem@...emloft.net
CC: netdev@...r.kernel.org, "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH v2 7/8] net: Use netlink_ns_capable to verify the permisions
of netlink messages
On 7/25/14, 4:22 AM, Wangyufen wrote:
> From: "Eric W. Biederman" <ebiederm@...ssion.com>
>
> 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@...capital.net>
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> Signed-off-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Wang Yufen <wangyufen@...wei.com>
> ---
> crypto/crypto_user.c | 2 +-
> drivers/connector/cn_proc.c | 2 +-
> drivers/scsi/scsi_netlink.c | 2 +-
> kernel/audit.c | 4 ++--
> net/core/rtnetlink.c | 2 +-
> net/decnet/dn_dev.c | 2 +-
> net/decnet/netfilter/dn_rtmsg.c | 2 +-
> net/netfilter/nfnetlink.c | 2 +-
> net/netlink/genetlink.c | 2 +-
> net/phonet/pn_netlink.c | 4 ++--
> net/tipc/netlink.c | 2 +-
> net/xfrm/xfrm_user.c | 2 +-
> 12 files changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
> index 910497b..c86969e 100644
> --- a/crypto/crypto_user.c
> +++ b/crypto/crypto_user.c
> @@ -452,7 +452,7 @@ 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) &&
> diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c
> index 094a710..46856ae 100644
> --- a/drivers/connector/cn_proc.c
> +++ b/drivers/connector/cn_proc.c
> @@ -332,7 +332,7 @@ 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;
> }
> diff --git a/drivers/scsi/scsi_netlink.c b/drivers/scsi/scsi_netlink.c
> index c77628a..a930b66 100644
> --- a/drivers/scsi/scsi_netlink.c
> +++ b/drivers/scsi/scsi_netlink.c
> @@ -112,7 +112,7 @@ 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;
> }
> diff --git a/kernel/audit.c b/kernel/audit.c
> index b4efae8..3c3a31c 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -601,13 +601,13 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
> case AUDIT_TTY_SET:
> case AUDIT_TRIM:
> case AUDIT_MAKE_EQUIV:
> - 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 */
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index a133427..d3ac150 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -2010,7 +2010,7 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
> sz_idx = type>>2;
> kind = type&3;
>
> - if (kind != 2 && !capable(CAP_NET_ADMIN))
> + if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
> return -EPERM;
>
> if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
> diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
> index c00e307..b79ce1e 100644
> --- a/net/decnet/dn_dev.c
> +++ b/net/decnet/dn_dev.c
> @@ -440,7 +440,7 @@ int dn_dev_ioctl(unsigned int cmd, void __user *arg)
> case SIOCGIFADDR:
> break;
> case SIOCSIFADDR:
> - if (!capable(CAP_NET_ADMIN))
> + if (!netlink_capable(skb, CAP_NET_ADMIN))
Hello,
I am working on the 3.2 backport based off of these patches and am
getting a compile error here. It appears even the 3.4 series doesn't
compile, snippet of compile log for 3.4 series below:
net/decnet/dn_dev.c: In function ‘dn_dev_ioctl’:
net/decnet/dn_dev.c:443:24: error: ‘skb’ undeclared (first use in this
function)
net/decnet/dn_dev.c:443:24: note: each undeclared identifier is reported
only once for each function it appears in
make[2]: *** [net/decnet/dn_dev.o] Error 1
make[1]: *** [net/decnet] Error 2
jtoppins@...ian-devel:~/linux/linux-stable$ git log --oneline -10
a926d22 netlink: Only check file credentials for implicit destinations
070d4a0 net: Use netlink_ns_capable to verify the permisions of netlink
messages
31393c4 net: Add variants of capable for use on netlink messages
45a1d1f net: Add variants of capable for use on on sockets
9f2effc netlink: Rename netlink_capable netlink_allowed
f4d5163 Add file_ns_capable() helper function for open-time capability
checking
3e8d4ac userns: make each net (net_ns) belong to a user_ns
9087c45 netlink: Make the sending netlink socket availabe in NETLINK_CB
82f9c4a Linux 3.4.100
21870a3 iommu/vt-d: Disable translation if already enabled
Am I missing something?
Thanks,
-Jon
> return -EACCES;
> if (sdn->sdn_family != AF_DECnet)
> return -EINVAL;
> diff --git a/net/decnet/netfilter/dn_rtmsg.c b/net/decnet/netfilter/dn_rtmsg.c
> index 1531135..dc750e2 100644
> --- a/net/decnet/netfilter/dn_rtmsg.c
> +++ b/net/decnet/netfilter/dn_rtmsg.c
> @@ -108,7 +108,7 @@ 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 */
> diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
> index e6ddde1..5cfc865 100644
> --- a/net/netfilter/nfnetlink.c
> +++ b/net/netfilter/nfnetlink.c
> @@ -129,7 +129,7 @@ static int nfnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
> const struct nfnetlink_subsystem *ss;
> int type, err;
>
> - if (!capable(CAP_NET_ADMIN))
> + if (!netlink_net_capable(skb, CAP_NET_ADMIN))
> return -EPERM;
>
> /* All the messages must at least contain nfgenmsg */
> diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
> index 73d3f0c..dff8562 100644
> --- a/net/netlink/genetlink.c
> +++ b/net/netlink/genetlink.c
> @@ -556,7 +556,7 @@ static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
> 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) {
> diff --git a/net/phonet/pn_netlink.c b/net/phonet/pn_netlink.c
> index d61f676..18485cd 100644
> --- a/net/phonet/pn_netlink.c
> +++ b/net/phonet/pn_netlink.c
> @@ -70,7 +70,7 @@ static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr)
> int err;
> u8 pnaddr;
>
> - if (!capable(CAP_SYS_ADMIN))
> + if (!netlink_capable(skb, CAP_SYS_ADMIN))
> return -EPERM;
>
> ASSERT_RTNL();
> @@ -228,7 +228,7 @@ static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr)
> int err;
> u8 dst;
>
> - if (!capable(CAP_SYS_ADMIN))
> + if (!netlink_capable(skb, CAP_SYS_ADMIN))
> return -EPERM;
>
> ASSERT_RTNL();
> diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c
> index 7bda8e3..0b4cf4f 100644
> --- a/net/tipc/netlink.c
> +++ b/net/tipc/netlink.c
> @@ -47,7 +47,7 @@ static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
> int hdr_space = NLMSG_SPACE(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;
> diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
> index c8b903d..ce16eba 100644
> --- a/net/xfrm/xfrm_user.c
> +++ b/net/xfrm/xfrm_user.c
> @@ -2317,7 +2317,7 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
> link = &xfrm_dispatch[type];
>
> /* All operations require privileges, even GET */
> - if (!capable(CAP_NET_ADMIN))
> + if (!netlink_net_capable(skb, CAP_NET_ADMIN))
> return -EPERM;
>
> if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
>
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