Re: [PATCH ghak124 v3] audit: log nftables configuration change events

On Thu, Jun 04, 2020 at 09:20:49AM -0400, Richard Guy Briggs wrote: > iptables, ip6tables, arptables and ebtables table registration, > replacement and unregistration configuration events are logged for the > native (legacy) iptables setsockopt api, but not for the > nftables netlink api which is used by the nft-variant of iptables in > addition to nftables itself. > > Add calls to log the configuration actions in the nftables netlink api. > > This uses the same NETFILTER_CFG record format but overloads the table > field. > > type=NETFILTER_CFG msg=audit(2020-05-28 17:46:41.878:162) : table=?:0;?:0 family=unspecified entries=2 op=nft_register_gen pid=396 subj=system_u:system_r:firewalld_t:s0 comm=firewalld > ... > type=NETFILTER_CFG msg=audit(2020-05-28 17:46:41.878:162) : table=firewalld:1;?:0 family=inet entries=0 op=nft_register_table pid=396 subj=system_u:system_r:firewalld_t:s0 comm=firewalld > ... > type=NETFILTER_CFG msg=audit(2020-05-28 17:46:41.911:163) : table=firewalld:1;filter_FORWARD:85 family=inet entries=8 op=nft_register_chain pid=396 subj=system_u:system_r:firewalld_t:s0 comm=firewalld > ... > type=NETFILTER_CFG msg=audit(2020-05-28 17:46:41.911:163) : table=firewalld:1;filter_FORWARD:85 family=inet entries=101 op=nft_register_rule pid=396 subj=system_u:system_r:firewalld_t:s0 comm=firewalld > ... > type=NETFILTER_CFG msg=audit(2020-05-28 17:46:41.911:163) : table=firewalld:1;__set0:87 family=inet entries=87 op=nft_register_setelem pid=396 subj=system_u:system_r:firewalld_t:s0 comm=firewalld > ... > type=NETFILTER_CFG msg=audit(2020-05-28 17:46:41.911:163) : table=firewalld:1;__set0:87 family=inet entries=0 op=nft_register_set pid=396 subj=system_u:system_r:firewalld_t:s0 comm=firewalld > > For further information please see issue > https://github.com/linux-audit/audit-kernel/issues/124 > > Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com&gt; > --- > Changelog: > v3: > - inline message type rather than table > > v2: > - differentiate between xtables and nftables > - add set, setelem, obj, flowtable, gen > - use nentries field as appropriate per type > - overload the "tables" field with table handle and chain/set/flowtable > > include/linux/audit.h | 18 ++++++++ > kernel/auditsc.c | 24 ++++++++-- > net/netfilter/nf_tables_api.c | 103 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 142 insertions(+), 3 deletions(-) > > diff --git a/include/linux/audit.h b/include/linux/audit.h > index 3fcd9ee49734..604ede630580 100644 > --- a/include/linux/audit.h > +++ b/include/linux/audit.h > @@ -12,6 +12,7 @@ > #include <linux/sched.h> > #include <linux/ptrace.h> > #include <uapi/linux/audit.h> > +#include <uapi/linux/netfilter/nf_tables.h> > > #define AUDIT_INO_UNSET ((unsigned long)-1) > #define AUDIT_DEV_UNSET ((dev_t)-1) > @@ -98,6 +99,23 @@ enum audit_nfcfgop { > AUDIT_XT_OP_REGISTER, > AUDIT_XT_OP_REPLACE, > AUDIT_XT_OP_UNREGISTER, > + AUDIT_NFT_OP_TABLE_REGISTER, > + AUDIT_NFT_OP_TABLE_UNREGISTER, > + AUDIT_NFT_OP_CHAIN_REGISTER, > + AUDIT_NFT_OP_CHAIN_UNREGISTER, > + AUDIT_NFT_OP_RULE_REGISTER, > + AUDIT_NFT_OP_RULE_UNREGISTER, > + AUDIT_NFT_OP_SET_REGISTER, > + AUDIT_NFT_OP_SET_UNREGISTER, > + AUDIT_NFT_OP_SETELEM_REGISTER, > + AUDIT_NFT_OP_SETELEM_UNREGISTER, > + AUDIT_NFT_OP_GEN_REGISTER, > + AUDIT_NFT_OP_OBJ_REGISTER, > + AUDIT_NFT_OP_OBJ_UNREGISTER, > + AUDIT_NFT_OP_OBJ_RESET, > + AUDIT_NFT_OP_FLOWTABLE_REGISTER, > + AUDIT_NFT_OP_FLOWTABLE_UNREGISTER, > + AUDIT_NFT_OP_INVALID, > }; > > extern int is_audit_feature_set(int which); > diff --git a/kernel/auditsc.c b/kernel/auditsc.c > index 468a23390457..3a9100e95fda 100644 > --- a/kernel/auditsc.c > +++ b/kernel/auditsc.c > @@ -75,6 +75,7 @@ > #include <linux/uaccess.h> > #include <linux/fsnotify_backend.h> > #include <uapi/linux/limits.h> > +#include <uapi/linux/netfilter/nf_tables.h> > > #include "audit.h" > > @@ -136,9 +137,26 @@ struct audit_nfcfgop_tab { > }; > > static const struct audit_nfcfgop_tab audit_nfcfgs[] = { > - { AUDIT_XT_OP_REGISTER, "register" }, > - { AUDIT_XT_OP_REPLACE, "replace" }, > - { AUDIT_XT_OP_UNREGISTER, "unregister" }, > + { AUDIT_XT_OP_REGISTER, "xt_register" }, > + { AUDIT_XT_OP_REPLACE, "xt_replace" }, > + { AUDIT_XT_OP_UNREGISTER, "xt_unregister" }, > + { AUDIT_NFT_OP_TABLE_REGISTER, "nft_register_table" }, > + { AUDIT_NFT_OP_TABLE_UNREGISTER, "nft_unregister_table" }, > + { AUDIT_NFT_OP_CHAIN_REGISTER, "nft_register_chain" }, > + { AUDIT_NFT_OP_CHAIN_UNREGISTER, "nft_unregister_chain" }, > + { AUDIT_NFT_OP_RULE_REGISTER, "nft_register_rule" }, > + { AUDIT_NFT_OP_RULE_UNREGISTER, "nft_unregister_rule" }, > + { AUDIT_NFT_OP_SET_REGISTER, "nft_register_set" }, > + { AUDIT_NFT_OP_SET_UNREGISTER, "nft_unregister_set" }, > + { AUDIT_NFT_OP_SETELEM_REGISTER, "nft_register_setelem" }, > + { AUDIT_NFT_OP_SETELEM_UNREGISTER, "nft_unregister_setelem" }, > + { AUDIT_NFT_OP_GEN_REGISTER, "nft_register_gen" }, > + { AUDIT_NFT_OP_OBJ_REGISTER, "nft_register_obj" }, > + { AUDIT_NFT_OP_OBJ_UNREGISTER, "nft_unregister_obj" }, > + { AUDIT_NFT_OP_OBJ_RESET, "nft_reset_obj" }, > + { AUDIT_NFT_OP_FLOWTABLE_REGISTER, "nft_register_flowtable" }, > + { AUDIT_NFT_OP_FLOWTABLE_UNREGISTER, "nft_unregister_flowtable" }, > + { AUDIT_NFT_OP_INVALID, "nft_invalid" }, > }; > > static int audit_match_perm(struct audit_context *ctx, int mask) > diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c > index 3558e76e2733..b9e7440cc87d 100644 > --- a/net/netfilter/nf_tables_api.c > +++ b/net/netfilter/nf_tables_api.c > @@ -12,6 +12,7 @@ > #include <linux/netlink.h> > #include <linux/vmalloc.h> > #include <linux/rhashtable.h> > +#include <linux/audit.h> > #include <linux/netfilter.h> > #include <linux/netfilter/nfnetlink.h> > #include <linux/netfilter/nf_tables.h> > @@ -693,6 +694,16 @@ static void nf_tables_table_notify(const struct nft_ctx *ctx, int event) > { > struct sk_buff *skb; > int err; > + char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0", > + ctx->table->name, ctx->table->handle); > + > + audit_log_nfcfg(buf, > + ctx->family, > + ctx->table->use, > + event == NFT_MSG_NEWTABLE ? > + AUDIT_NFT_OP_TABLE_REGISTER : > + AUDIT_NFT_OP_TABLE_UNREGISTER); > + kfree(buf); As a follow up: Would you wrap this code into a function? nft_table_audit() Same thing for other pieces of code below.

Thanks.