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* [PATCH v4] audit: log nftables configuration change events once per table
@ 2021-03-25  3:52 Richard Guy Briggs
  2021-03-25  5:13 ` kernel test robot
  0 siblings, 1 reply; 2+ messages in thread
From: Richard Guy Briggs @ 2021-03-25  3:52 UTC (permalink / raw)
  To: Linux-Audit Mailing List, LKML, netfilter-devel
  Cc: Jones Desougi, Richard Guy Briggs, Phil Sutter, Florian Westphal,
	twoerner, Eric Paris, tgraf, dan.carpenter

Reduce logging of nftables events to a level similar to iptables.
Restore the table field to list the table, adding the generation.

Indicate the op as the most significant operation in the event.

A couple of sample events:

type=PROCTITLE msg=audit(2021-03-18 09:30:49.801:143) : proctitle=/usr/bin/python3 -s /usr/sbin/firewalld --nofork --nopid
type=SYSCALL msg=audit(2021-03-18 09:30:49.801:143) : arch=x86_64 syscall=sendmsg success=yes exit=172 a0=0x6 a1=0x7ffdcfcbe650 a2=0x0 a3=0x7ffdcfcbd52c items=0 ppid=1 pid=367 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=roo
t sgid=root fsgid=root tty=(none) ses=unset comm=firewalld exe=/usr/bin/python3.9 subj=system_u:system_r:firewalld_t:s0 key=(null)
type=NETFILTER_CFG msg=audit(2021-03-18 09:30:49.801:143) : table=firewalld:2 family=ipv6 entries=1 op=nft_register_table pid=367 subj=system_u:system_r:firewalld_t:s0 comm=firewalld
type=NETFILTER_CFG msg=audit(2021-03-18 09:30:49.801:143) : table=firewalld:2 family=ipv4 entries=1 op=nft_register_table pid=367 subj=system_u:system_r:firewalld_t:s0 comm=firewalld
type=NETFILTER_CFG msg=audit(2021-03-18 09:30:49.801:143) : table=firewalld:2 family=inet entries=1 op=nft_register_table pid=367 subj=system_u:system_r:firewalld_t:s0 comm=firewalld

type=PROCTITLE msg=audit(2021-03-18 09:30:49.839:144) : proctitle=/usr/bin/python3 -s /usr/sbin/firewalld --nofork --nopid
type=SYSCALL msg=audit(2021-03-18 09:30:49.839:144) : arch=x86_64 syscall=sendmsg success=yes exit=22792 a0=0x6 a1=0x7ffdcfcbe650 a2=0x0 a3=0x7ffdcfcbd52c items=0 ppid=1 pid=367 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=r
oot sgid=root fsgid=root tty=(none) ses=unset comm=firewalld exe=/usr/bin/python3.9 subj=system_u:system_r:firewalld_t:s0 key=(null)
type=NETFILTER_CFG msg=audit(2021-03-18 09:30:49.839:144) : table=firewalld:3 family=ipv6 entries=30 op=nft_register_chain pid=367 subj=system_u:system_r:firewalld_t:s0 comm=firewalld
type=NETFILTER_CFG msg=audit(2021-03-18 09:30:49.839:144) : table=firewalld:3 family=ipv4 entries=30 op=nft_register_chain pid=367 subj=system_u:system_r:firewalld_t:s0 comm=firewalld
type=NETFILTER_CFG msg=audit(2021-03-18 09:30:49.839:144) : table=firewalld:3 family=inet entries=165 op=nft_register_chain pid=367 subj=system_u:system_r:firewalld_t:s0 comm=firewalld

The issue was originally documented in
https://github.com/linux-audit/audit-kernel/issues/124

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
---
Changelog:
v4:
- move nf_tables_commit_audit_log() before nf_tables_commit_release() [fw]
- move nft2audit_op[] from audit.h to nf_tables_api.c

v3:
- fix function braces, reduce parameter scope [pna]
- pre-allocate nft_audit_data per table in step 1, bail on ENOMEM [pna]

v2:
- convert NFT ops to array indicies in nft2audit_op[] [ps]
- use linux lists [pna]
- use functions for each of collection and logging of audit data [pna]
---
 net/netfilter/nf_tables_api.c | 187 +++++++++++++++++++---------------
 1 file changed, 104 insertions(+), 83 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index c1eb5cdb3033..9c930fe72005 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -66,6 +66,41 @@ static const struct rhashtable_params nft_objname_ht_params = {
 	.automatic_shrinking	= true,
 };
 
+struct nft_audit_data {
+	struct nft_table *table;
+	int entries;
+	int op;
+	struct list_head list;
+};
+
+static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
+	[NFT_MSG_NEWTABLE]	= AUDIT_NFT_OP_TABLE_REGISTER,
+	[NFT_MSG_GETTABLE]	= AUDIT_NFT_OP_INVALID,
+	[NFT_MSG_DELTABLE]	= AUDIT_NFT_OP_TABLE_UNREGISTER,
+	[NFT_MSG_NEWCHAIN]	= AUDIT_NFT_OP_CHAIN_REGISTER,
+	[NFT_MSG_GETCHAIN]	= AUDIT_NFT_OP_INVALID,
+	[NFT_MSG_DELCHAIN]	= AUDIT_NFT_OP_CHAIN_UNREGISTER,
+	[NFT_MSG_NEWRULE]	= AUDIT_NFT_OP_RULE_REGISTER,
+	[NFT_MSG_GETRULE]	= AUDIT_NFT_OP_INVALID,
+	[NFT_MSG_DELRULE]	= AUDIT_NFT_OP_RULE_UNREGISTER,
+	[NFT_MSG_NEWSET]	= AUDIT_NFT_OP_SET_REGISTER,
+	[NFT_MSG_GETSET]	= AUDIT_NFT_OP_INVALID,
+	[NFT_MSG_DELSET]	= AUDIT_NFT_OP_SET_UNREGISTER,
+	[NFT_MSG_NEWSETELEM]	= AUDIT_NFT_OP_SETELEM_REGISTER,
+	[NFT_MSG_GETSETELEM]	= AUDIT_NFT_OP_INVALID,
+	[NFT_MSG_DELSETELEM]	= AUDIT_NFT_OP_SETELEM_UNREGISTER,
+	[NFT_MSG_NEWGEN]	= AUDIT_NFT_OP_GEN_REGISTER,
+	[NFT_MSG_GETGEN]	= AUDIT_NFT_OP_INVALID,
+	[NFT_MSG_TRACE]		= AUDIT_NFT_OP_INVALID,
+	[NFT_MSG_NEWOBJ]	= AUDIT_NFT_OP_OBJ_REGISTER,
+	[NFT_MSG_GETOBJ]	= AUDIT_NFT_OP_INVALID,
+	[NFT_MSG_DELOBJ]	= AUDIT_NFT_OP_OBJ_UNREGISTER,
+	[NFT_MSG_GETOBJ_RESET]	= AUDIT_NFT_OP_OBJ_RESET,
+	[NFT_MSG_NEWFLOWTABLE]	= AUDIT_NFT_OP_FLOWTABLE_REGISTER,
+	[NFT_MSG_GETFLOWTABLE]	= AUDIT_NFT_OP_INVALID,
+	[NFT_MSG_DELFLOWTABLE]	= AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
+};
+
 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 {
 	switch (net->nft.validate_state) {
@@ -717,17 +752,6 @@ 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,
-			GFP_KERNEL);
-	kfree(buf);
 
 	if (!ctx->report &&
 	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
@@ -1491,18 +1515,6 @@ static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
 {
 	struct sk_buff *skb;
 	int err;
-	char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
-			      ctx->table->name, ctx->table->handle,
-			      ctx->chain->name, ctx->chain->handle);
-
-	audit_log_nfcfg(buf,
-			ctx->family,
-			ctx->chain->use,
-			event == NFT_MSG_NEWCHAIN ?
-				AUDIT_NFT_OP_CHAIN_REGISTER :
-				AUDIT_NFT_OP_CHAIN_UNREGISTER,
-			GFP_KERNEL);
-	kfree(buf);
 
 	if (!ctx->report &&
 	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
@@ -2855,18 +2867,6 @@ static void nf_tables_rule_notify(const struct nft_ctx *ctx,
 {
 	struct sk_buff *skb;
 	int err;
-	char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
-			      ctx->table->name, ctx->table->handle,
-			      ctx->chain->name, ctx->chain->handle);
-
-	audit_log_nfcfg(buf,
-			ctx->family,
-			rule->handle,
-			event == NFT_MSG_NEWRULE ?
-				AUDIT_NFT_OP_RULE_REGISTER :
-				AUDIT_NFT_OP_RULE_UNREGISTER,
-			GFP_KERNEL);
-	kfree(buf);
 
 	if (!ctx->report &&
 	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
@@ -3901,18 +3901,6 @@ static void nf_tables_set_notify(const struct nft_ctx *ctx,
 	struct sk_buff *skb;
 	u32 portid = ctx->portid;
 	int err;
-	char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
-			      ctx->table->name, ctx->table->handle,
-			      set->name, set->handle);
-
-	audit_log_nfcfg(buf,
-			ctx->family,
-			set->field_count,
-			event == NFT_MSG_NEWSET ?
-				AUDIT_NFT_OP_SET_REGISTER :
-				AUDIT_NFT_OP_SET_UNREGISTER,
-			gfp_flags);
-	kfree(buf);
 
 	if (!ctx->report &&
 	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
@@ -5097,18 +5085,6 @@ static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
 	u32 portid = ctx->portid;
 	struct sk_buff *skb;
 	int err;
-	char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
-			      ctx->table->name, ctx->table->handle,
-			      set->name, set->handle);
-
-	audit_log_nfcfg(buf,
-			ctx->family,
-			set->handle,
-			event == NFT_MSG_NEWSETELEM ?
-				AUDIT_NFT_OP_SETELEM_REGISTER :
-				AUDIT_NFT_OP_SETELEM_UNREGISTER,
-			GFP_KERNEL);
-	kfree(buf);
 
 	if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
 		return;
@@ -6310,12 +6286,11 @@ static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
 			    filter->type != NFT_OBJECT_UNSPEC &&
 			    obj->ops->type->type != filter->type)
 				goto cont;
-
 			if (reset) {
 				char *buf = kasprintf(GFP_ATOMIC,
-						      "%s:%llu;?:0",
+						      "%s:%u",
 						      table->name,
-						      table->handle);
+						      net->nft.base_seq);
 
 				audit_log_nfcfg(buf,
 						family,
@@ -6436,8 +6411,8 @@ static int nf_tables_getobj(struct net *net, struct sock *nlsk,
 		reset = true;
 
 	if (reset) {
-		char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
-				      table->name, table->handle);
+		char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
+				      table->name, net->nft.base_seq);
 
 		audit_log_nfcfg(buf,
 				family,
@@ -6525,15 +6500,15 @@ void nft_obj_notify(struct net *net, const struct nft_table *table,
 {
 	struct sk_buff *skb;
 	int err;
-	char *buf = kasprintf(gfp, "%s:%llu;?:0",
-			      table->name, table->handle);
+	char *buf = kasprintf(gfp, "%s:%u",
+			      table->name, net->nft.base_seq);
 
 	audit_log_nfcfg(buf,
 			family,
 			obj->handle,
 			event == NFT_MSG_NEWOBJ ?
-				AUDIT_NFT_OP_OBJ_REGISTER :
-				AUDIT_NFT_OP_OBJ_UNREGISTER,
+				 AUDIT_NFT_OP_OBJ_REGISTER :
+				 AUDIT_NFT_OP_OBJ_UNREGISTER,
 			gfp);
 	kfree(buf);
 
@@ -7333,18 +7308,6 @@ static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
 {
 	struct sk_buff *skb;
 	int err;
-	char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
-			      flowtable->table->name, flowtable->table->handle,
-			      flowtable->name, flowtable->handle);
-
-	audit_log_nfcfg(buf,
-			ctx->family,
-			flowtable->hooknum,
-			event == NFT_MSG_NEWFLOWTABLE ?
-				AUDIT_NFT_OP_FLOWTABLE_REGISTER :
-				AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
-			GFP_KERNEL);
-	kfree(buf);
 
 	if (!ctx->report &&
 	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
@@ -7465,9 +7428,6 @@ static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
 	struct sk_buff *skb2;
 	int err;
 
-	audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
-			AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
-
 	if (!nlmsg_report(nlh) &&
 	    !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
 		return;
@@ -8006,12 +7966,65 @@ static void nft_commit_notify(struct net *net, u32 portid)
 	WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
 }
 
+int nf_tables_commit_audit_alloc(struct list_head *adl,
+				 struct nft_table *table)
+{
+	struct nft_audit_data *adp;
+
+	list_for_each_entry(adp, adl, list) {
+		if (adp->table == table)
+			return 0;
+	}
+	adp = kzalloc(sizeof(*adp), GFP_KERNEL);
+	if (!adp)
+		return -ENOMEM;
+	adp->table = table;
+	INIT_LIST_HEAD(&adp->list);
+	list_add(&adp->list, adl);
+	return 0;
+}
+
+void nf_tables_commit_audit_collect(struct list_head *adl,
+				    struct nft_table *table, u32 op)
+{
+	struct nft_audit_data *adp;
+
+	list_for_each_entry(adp, adl, list) {
+		if (adp->table == table)
+			goto found;
+	}
+	WARN_ONCE("table=%s not expected in commit list", table->name);
+	return;
+found:
+	adp->entries++;
+	if (!adp->op || adp->op > op)
+		adp->op = op;
+}
+
+#define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
+
+void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
+{
+	struct nft_audit_data *adp, *adn;
+	char aubuf[AUNFTABLENAMELEN];
+
+	list_for_each_entry_safe(adp, adn, adl, list) {
+		snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
+			 generation);
+		audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
+				nft2audit_op[adp->op], GFP_KERNEL);
+		list_del(&adp->list);
+		kfree(adp);
+	}
+}
+
 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
 {
 	struct nft_trans *trans, *next;
 	struct nft_trans_elem *te;
 	struct nft_chain *chain;
 	struct nft_table *table;
+	LIST_HEAD(adl);
 	int err;
 
 	if (list_empty(&net->nft.commit_list)) {
@@ -8031,6 +8044,11 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
 	list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
 		int ret;
 
+		ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
+		if (ret) {
+			nf_tables_commit_chain_prepare_cancel(net);
+			return ret;
+		}
 		if (trans->msg_type == NFT_MSG_NEWRULE ||
 		    trans->msg_type == NFT_MSG_DELRULE) {
 			chain = trans->ctx.chain;
@@ -8206,10 +8224,13 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
 			}
 			break;
 		}
+		nf_tables_commit_audit_collect(&adl, trans->ctx.table,
+					       trans->msg_type);
 	}
 
 	nft_commit_notify(net, NETLINK_CB(skb).portid);
 	nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
+	nf_tables_commit_audit_log(&adl, net->nft.base_seq);
 	nf_tables_commit_release(net);
 
 	return 0;
-- 
2.27.0

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* Re: [PATCH v4] audit: log nftables configuration change events once per table
  2021-03-25  3:52 [PATCH v4] audit: log nftables configuration change events once per table Richard Guy Briggs
@ 2021-03-25  5:13 ` kernel test robot
  0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2021-03-25  5:13 UTC (permalink / raw)
  To: Richard Guy Briggs, Linux-Audit Mailing List, LKML, netfilter-devel
  Cc: kbuild-all, Richard Guy Briggs, Phil Sutter, Florian Westphal,
	twoerner, Eric Paris


[-- Attachment #1: Type: text/plain, Size: 4005 bytes --]

Hi Richard,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on nf/master]
[also build test WARNING on nf-next/master pcmoore-audit/next v5.12-rc4 next-20210324]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Richard-Guy-Briggs/audit-log-nftables-configuration-change-events-once-per-table/20210325-115438
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git master
config: arc-allyesconfig (attached as .config)
compiler: arceb-elf-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/e2632994acb2553a22a739b3a876a091d04f446c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Richard-Guy-Briggs/audit-log-nftables-configuration-change-events-once-per-table/20210325-115438
        git checkout e2632994acb2553a22a739b3a876a091d04f446c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> net/netfilter/nf_tables_api.c:7993:5: warning: no previous prototype for 'nf_tables_commit_audit_alloc' [-Wmissing-prototypes]
    7993 | int nf_tables_commit_audit_alloc(struct list_head *adl,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> net/netfilter/nf_tables_api.c:8011:6: warning: no previous prototype for 'nf_tables_commit_audit_collect' [-Wmissing-prototypes]
    8011 | void nf_tables_commit_audit_collect(struct list_head *adl,
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> net/netfilter/nf_tables_api.c:8030:6: warning: no previous prototype for 'nf_tables_commit_audit_log' [-Wmissing-prototypes]
    8030 | void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/nf_tables_commit_audit_alloc +7993 net/netfilter/nf_tables_api.c

  7992	
> 7993	int nf_tables_commit_audit_alloc(struct list_head *adl,
  7994					 struct nft_table *table)
  7995	{
  7996		struct nft_audit_data *adp;
  7997	
  7998		list_for_each_entry(adp, adl, list) {
  7999			if (adp->table == table)
  8000				return 0;
  8001		}
  8002		adp = kzalloc(sizeof(*adp), GFP_KERNEL);
  8003		if (!adp)
  8004			return -ENOMEM;
  8005		adp->table = table;
  8006		INIT_LIST_HEAD(&adp->list);
  8007		list_add(&adp->list, adl);
  8008		return 0;
  8009	}
  8010	
> 8011	void nf_tables_commit_audit_collect(struct list_head *adl,
  8012					    struct nft_table *table, u32 op)
  8013	{
  8014		struct nft_audit_data *adp;
  8015	
  8016		list_for_each_entry(adp, adl, list) {
  8017			if (adp->table == table)
  8018				goto found;
  8019		}
  8020		WARN_ONCE("table=%s not expected in commit list", table->name);
  8021		return;
  8022	found:
  8023		adp->entries++;
  8024		if (!adp->op || adp->op > op)
  8025			adp->op = op;
  8026	}
  8027	
  8028	#define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
  8029	
> 8030	void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
  8031	{
  8032		struct nft_audit_data *adp, *adn;
  8033		char aubuf[AUNFTABLENAMELEN];
  8034	
  8035		list_for_each_entry_safe(adp, adn, adl, list) {
  8036			snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
  8037				 generation);
  8038			audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
  8039					nft2audit_op[adp->op], GFP_KERNEL);
  8040			list_del(&adp->list);
  8041			kfree(adp);
  8042		}
  8043	}
  8044	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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2021-03-25  3:52 [PATCH v4] audit: log nftables configuration change events once per table Richard Guy Briggs
2021-03-25  5:13 ` kernel test robot

Linux-audit Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-audit/0 linux-audit/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-audit linux-audit/ https://lore.kernel.org/linux-audit \
		linux-audit@redhat.com
	public-inbox-index linux-audit

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/com.redhat.linux-audit


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git