From patchwork Fri Mar 15 18:29:56 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Guy Briggs X-Patchwork-Id: 1057209 X-Patchwork-Delegate: pablo@netfilter.org Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netfilter-devel-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 44LZ5H0qD6z9sBr for ; Sat, 16 Mar 2019 05:35:31 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726703AbfCOSfG (ORCPT ); Fri, 15 Mar 2019 14:35:06 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58658 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725963AbfCOSfG (ORCPT ); Fri, 15 Mar 2019 14:35:06 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3BEB2306D333; Fri, 15 Mar 2019 18:35:00 +0000 (UTC) Received: from madcap2.tricolour.ca (ovpn-112-22.phx2.redhat.com [10.3.112.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id 027345C28D; Fri, 15 Mar 2019 18:34:37 +0000 (UTC) From: Richard Guy Briggs To: containers@lists.linux-foundation.org, linux-api@vger.kernel.org, Linux-Audit Mailing List , linux-fsdevel@vger.kernel.org, LKML , netdev@vger.kernel.org, netfilter-devel@vger.kernel.org Cc: Paul Moore , sgrubb@redhat.com, omosnace@redhat.com, dhowells@redhat.com, simo@redhat.com, eparis@parisplace.org, serge@hallyn.com, ebiederm@xmission.com, nhorman@tuxdriver.com, Richard Guy Briggs Subject: [PATCH ghak90 V5 08/10] audit: add containerid filtering Date: Fri, 15 Mar 2019 14:29:56 -0400 Message-Id: <3f02f7b56d2fba2918ff6fe90fcfa3ae558faff8.1552665316.git.rgb@redhat.com> In-Reply-To: References: In-Reply-To: References: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Fri, 15 Mar 2019 18:35:05 +0000 (UTC) Sender: netfilter-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org Implement audit container identifier filtering using the AUDIT_CONTID field name to send an 8-character string representing a u64 since the value field is only u32. Sending it as two u32 was considered, but gathering and comparing two fields was more complex. The feature indicator is AUDIT_FEATURE_BITMAP_CONTAINERID. See: https://github.com/linux-audit/audit-kernel/issues/91 See: https://github.com/linux-audit/audit-userspace/issues/40 See: https://github.com/linux-audit/audit-testsuite/issues/64 See: https://github.com/linux-audit/audit-kernel/wiki/RFE-Audit-Container-ID Signed-off-by: Richard Guy Briggs Acked-by: Serge Hallyn Acked-by: Neil Horman Reviewed-by: Ondrej Mosnacek --- include/linux/audit.h | 1 + include/uapi/linux/audit.h | 5 ++++- kernel/audit.h | 1 + kernel/auditfilter.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++ kernel/auditsc.c | 3 +++ 5 files changed, 56 insertions(+), 1 deletion(-) diff --git a/include/linux/audit.h b/include/linux/audit.h index 6db5aba7cc01..fa19fa408931 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -77,6 +77,7 @@ struct audit_field { u32 type; union { u32 val; + u64 val64; kuid_t uid; kgid_t gid; struct { diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h index a6383e28b2c8..741ab6f38294 100644 --- a/include/uapi/linux/audit.h +++ b/include/uapi/linux/audit.h @@ -265,6 +265,7 @@ #define AUDIT_LOGINUID_SET 24 #define AUDIT_SESSIONID 25 /* Session ID */ #define AUDIT_FSTYPE 26 /* FileSystem Type */ +#define AUDIT_CONTID 27 /* Container ID */ /* These are ONLY useful when checking * at syscall exit time (AUDIT_AT_EXIT). */ @@ -345,6 +346,7 @@ enum { #define AUDIT_FEATURE_BITMAP_SESSIONID_FILTER 0x00000010 #define AUDIT_FEATURE_BITMAP_LOST_RESET 0x00000020 #define AUDIT_FEATURE_BITMAP_FILTER_FS 0x00000040 +#define AUDIT_FEATURE_BITMAP_CONTAINERID 0x00000080 #define AUDIT_FEATURE_BITMAP_ALL (AUDIT_FEATURE_BITMAP_BACKLOG_LIMIT | \ AUDIT_FEATURE_BITMAP_BACKLOG_WAIT_TIME | \ @@ -352,7 +354,8 @@ enum { AUDIT_FEATURE_BITMAP_EXCLUDE_EXTEND | \ AUDIT_FEATURE_BITMAP_SESSIONID_FILTER | \ AUDIT_FEATURE_BITMAP_LOST_RESET | \ - AUDIT_FEATURE_BITMAP_FILTER_FS) + AUDIT_FEATURE_BITMAP_FILTER_FS | \ + AUDIT_FEATURE_BITMAP_CONTAINERID) /* deprecated: AUDIT_VERSION_* */ #define AUDIT_VERSION_LATEST AUDIT_FEATURE_BITMAP_ALL diff --git a/kernel/audit.h b/kernel/audit.h index 2a1a8b8a8019..3a40b608bf8d 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -230,6 +230,7 @@ static inline int audit_hash_ino(u32 ino) extern int audit_match_class(int class, unsigned syscall); extern int audit_comparator(const u32 left, const u32 op, const u32 right); +extern int audit_comparator64(const u64 left, const u32 op, const u64 right); extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right); extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right); extern int parent_len(const char *path); diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index add360b46b38..516b8e58959e 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -410,6 +410,7 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f) /* FALL THROUGH */ case AUDIT_ARCH: case AUDIT_FSTYPE: + case AUDIT_CONTID: if (f->op != Audit_not_equal && f->op != Audit_equal) return -EINVAL; break; @@ -582,6 +583,14 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, } entry->rule.exe = audit_mark; break; + case AUDIT_CONTID: + if (f->val != sizeof(u64)) + goto exit_free; + str = audit_unpack_string(&bufp, &remain, f->val); + if (IS_ERR(str)) + goto exit_free; + f->val64 = ((u64 *)str)[0]; + break; } } @@ -664,6 +673,11 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule) data->buflen += data->values[i] = audit_pack_string(&bufp, audit_mark_path(krule->exe)); break; + case AUDIT_CONTID: + data->buflen += data->values[i] = sizeof(u64); + for (i = 0; i < sizeof(u64); i++) + ((char *)bufp)[i] = ((char *)&f->val64)[i]; + break; case AUDIT_LOGINUID_SET: if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) { data->fields[i] = AUDIT_LOGINUID; @@ -750,6 +764,10 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b) if (!gid_eq(a->fields[i].gid, b->fields[i].gid)) return 1; break; + case AUDIT_CONTID: + if (a->fields[i].val64 != b->fields[i].val64) + return 1; + break; default: if (a->fields[i].val != b->fields[i].val) return 1; @@ -1206,6 +1224,31 @@ int audit_comparator(u32 left, u32 op, u32 right) } } +int audit_comparator64(u64 left, u32 op, u64 right) +{ + switch (op) { + case Audit_equal: + return (left == right); + case Audit_not_equal: + return (left != right); + case Audit_lt: + return (left < right); + case Audit_le: + return (left <= right); + case Audit_gt: + return (left > right); + case Audit_ge: + return (left >= right); + case Audit_bitmask: + return (left & right); + case Audit_bittest: + return ((left & right) == right); + default: + BUG(); + return 0; + } +} + int audit_uid_comparator(kuid_t left, u32 op, kuid_t right) { switch (op) { @@ -1344,6 +1387,10 @@ int audit_filter(int msgtype, unsigned int listtype) result = audit_comparator(audit_loginuid_set(current), f->op, f->val); break; + case AUDIT_CONTID: + result = audit_comparator64(audit_get_contid(current), + f->op, f->val64); + break; case AUDIT_MSGTYPE: result = audit_comparator(msgtype, f->op, f->val); break; diff --git a/kernel/auditsc.c b/kernel/auditsc.c index aa5d13b4fbbb..2d74238e9638 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -616,6 +616,9 @@ static int audit_filter_rules(struct task_struct *tsk, case AUDIT_LOGINUID_SET: result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val); break; + case AUDIT_CONTID: + result = audit_comparator64(audit_get_contid(tsk), f->op, f->val64); + break; case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: