From patchwork Sat Jun 27 13:20:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Guy Briggs X-Patchwork-Id: 11629611 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6A5F26C1 for ; Sat, 27 Jun 2020 13:24:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4864120E65 for ; Sat, 27 Jun 2020 13:24:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="DlOrdI2D" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726898AbgF0NXc (ORCPT ); Sat, 27 Jun 2020 09:23:32 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:39331 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726887AbgF0NXV (ORCPT ); Sat, 27 Jun 2020 09:23:21 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1593264198; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:in-reply-to: references:references:references; bh=TabxwYO5FJzN2Y5mg+1gJx1Jhp2y0LmF7+qh/iqVe0E=; b=DlOrdI2DCC0gbb2GXrR62FdpBRWPFFKftb0dBziydQodBD/hTNTLftGFKHRIrbjwvGZQqY c6oXEd34AhjSXACxlTS4NP2luOnIF2+pVkmCn2P4a1F0pgQqrlWdwbwBNjfC/14WkmtoPF As2+j7Jd/TyOQVmFXgoHoTFEj9Zzl0o= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-262-QqYNox7hMZ2Y1NPdZsHkvg-1; Sat, 27 Jun 2020 09:23:15 -0400 X-MC-Unique: QqYNox7hMZ2Y1NPdZsHkvg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2A14B10059A4; Sat, 27 Jun 2020 13:23:14 +0000 (UTC) Received: from madcap2.tricolour.ca (unknown [10.10.110.28]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0456971662; Sat, 27 Jun 2020 13:22:56 +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, dwalsh@redhat.com, mpatel@redhat.com, Richard Guy Briggs Subject: [PATCH ghak90 V9 09/13] audit: add containerid filtering Date: Sat, 27 Jun 2020 09:20:42 -0400 Message-Id: <6355038dbfc0b3fb41ba0f3ff9f34b044128f959.1593198710.git.rgb@redhat.com> In-Reply-To: References: In-Reply-To: References: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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. Please see the github audit kernel issue for the contid filter feature: https://github.com/linux-audit/audit-kernel/issues/91 Please see the github audit userspace issue for filter additions: https://github.com/linux-audit/audit-userspace/issues/40 Please see the github audit testsuiite issue for the test case: https://github.com/linux-audit/audit-testsuite/issues/64 Please see the github audit wiki for the feature overview: 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 | 46 ++++++++++++++++++++++++++++++++++++++++++++++ kernel/auditsc.c | 4 ++++ 5 files changed, 56 insertions(+), 1 deletion(-) diff --git a/include/linux/audit.h b/include/linux/audit.h index 15d0defc5193..c4a755ae0d61 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -68,6 +68,7 @@ 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 a56ad77069b9..831c12bdd235 100644 --- a/include/uapi/linux/audit.h +++ b/include/uapi/linux/audit.h @@ -271,6 +271,7 @@ #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). */ @@ -352,6 +353,7 @@ 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 | \ @@ -359,7 +361,8 @@ 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 a7f88d76163f..34d8ec4bc6ef 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -228,6 +228,7 @@ static inline int audit_hash_contid(u64 contid) 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 a10e2997aa6c..d812698efc1d 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -399,6 +399,7 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f) case AUDIT_FILETYPE: case AUDIT_FIELD_COMPARE: case AUDIT_EXE: + case AUDIT_CONTID: /* only equal and not equal valid ops */ if (f->op != Audit_not_equal && f->op != Audit_equal) return -EINVAL; @@ -590,6 +591,14 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, entry->rule.buflen += f_val; 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; default: f->val = f_val; break; @@ -675,6 +684,11 @@ 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); + memcpy(bufp, &f->val64, sizeof(u64)); + bufp += sizeof(u64); + break; case AUDIT_LOGINUID_SET: if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) { data->fields[i] = AUDIT_LOGINUID; @@ -761,6 +775,10 @@ 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; @@ -1216,6 +1234,30 @@ 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: + return 0; + } +} + int audit_uid_comparator(kuid_t left, u32 op, kuid_t right) { switch (op) { @@ -1350,6 +1392,10 @@ 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 935eb3d2cde9..baa5709590b4 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -640,6 +640,10 @@ static int audit_filter_rules(struct task_struct *tsk, result = audit_comparator(ctx->sockaddr->ss_family, 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: