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| author | Lukasz Pawelczyk <l.pawelczyk@samsung.com> | 2019-05-10 13:46:22 +0200 |
|---|---|---|
| committer | Seung-Woo Kim <sw0312.kim@samsung.com> | 2019-07-03 19:01:35 +0900 |
| commit | e3bd7e7ec6cf1d9661f3cdc7f31231b29913cabc (patch) | |
| tree | 878cb60ac5ab6b3deec8b200478817f333585f50 | |
| parent | 8d40f3e556f9473254b6ac1dc0c0f564f1cdcd08 (diff) | |
| download | linux-exynos-e3bd7e7ec6cf1d9661f3cdc7f31231b29913cabc.tar.gz linux-exynos-e3bd7e7ec6cf1d9661f3cdc7f31231b29913cabc.tar.bz2 linux-exynos-e3bd7e7ec6cf1d9661f3cdc7f31231b29913cabc.zip | |
netfilter: xt_owner: Add supplementary groups option
The XT_OWNER_SUPPL_GROUPS flag causes GIDs specified with XT_OWNER_GID
to be also checked in the supplementary groups of a process.
f_cred->group_info cannot be modified during its lifetime and f_cred
holds a reference to it so it's safe to use.
Signed-off-by: Lukasz Pawelczyk <l.pawelczyk@samsung.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
[sw0312.kim: backport from mainline to apply supplementary groups on netfilter]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Change-Id: Ie2e4c64388b4c64794ebc73de9bacf206eb46173
| -rw-r--r-- | include/uapi/linux/netfilter/xt_owner.h | 7 | ||||
| -rw-r--r-- | net/netfilter/xt_owner.c | 23 |
2 files changed, 24 insertions, 6 deletions
diff --git a/include/uapi/linux/netfilter/xt_owner.h b/include/uapi/linux/netfilter/xt_owner.h index fa3ad84957d5..9e98c09eda32 100644 --- a/include/uapi/linux/netfilter/xt_owner.h +++ b/include/uapi/linux/netfilter/xt_owner.h @@ -5,9 +5,10 @@ #include <linux/types.h> enum { - XT_OWNER_UID = 1 << 0, - XT_OWNER_GID = 1 << 1, - XT_OWNER_SOCKET = 1 << 2, + XT_OWNER_UID = 1 << 0, + XT_OWNER_GID = 1 << 1, + XT_OWNER_SOCKET = 1 << 2, + XT_OWNER_SUPPL_GROUPS = 1 << 3, }; struct xt_owner_match_info { diff --git a/net/netfilter/xt_owner.c b/net/netfilter/xt_owner.c index 3d705c688a27..acff455a619b 100644 --- a/net/netfilter/xt_owner.c +++ b/net/netfilter/xt_owner.c @@ -91,11 +91,28 @@ owner_mt(const struct sk_buff *skb, struct xt_action_param *par) } if (info->match & XT_OWNER_GID) { + unsigned int i, match = false; kgid_t gid_min = make_kgid(net->user_ns, info->gid_min); kgid_t gid_max = make_kgid(net->user_ns, info->gid_max); - if ((gid_gte(filp->f_cred->fsgid, gid_min) && - gid_lte(filp->f_cred->fsgid, gid_max)) ^ - !(info->invert & XT_OWNER_GID)) + struct group_info *gi = filp->f_cred->group_info; + + if (gid_gte(filp->f_cred->fsgid, gid_min) && + gid_lte(filp->f_cred->fsgid, gid_max)) + match = true; + + if (!match && (info->match & XT_OWNER_SUPPL_GROUPS) && gi) { + for (i = 0; i < gi->ngroups; ++i) { + kgid_t group = gi->gid[i]; + + if (gid_gte(group, gid_min) && + gid_lte(group, gid_max)) { + match = true; + break; + } + } + } + + if (match ^ !(info->invert & XT_OWNER_GID)) return false; } |