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To be able to send auditing events to user space, we introduce a generic dm-audit module. It provides helper functions to emit audit events through the kernel audit subsystem. We claim the AUDIT_DM_CTRL type=1336 and AUDIT_DM_EVENT type=1337 out of the audit event messages range in the corresponding userspace api in 'include/uapi/linux/audit.h' for those events. AUDIT_DM_CTRL is used to provide information about creation and destruction of device mapper targets which are triggered by user space admin control actions. AUDIT_DM_EVENT is used to provide information about actual errors during operation of the mapped device, showing e.g. integrity violations in audit log. Following commits to device mapper targets actually will make use of this to emit those events in relevant cases. The audit logs look like this if executing the following simple test: # dd if=/dev/zero of=test.img bs=1M count=1024 # losetup -f test.img # integritysetup -vD format --integrity sha256 -t 32 /dev/loop0 # integritysetup open -D /dev/loop0 --integrity sha256 integritytest # integritysetup status integritytest # integritysetup close integritytest # integritysetup open -D /dev/loop0 --integrity sha256 integritytest # integritysetup status integritytest # dd if=/dev/urandom of=/dev/loop0 bs=512 count=1 seek=100000 # dd if=/dev/mapper/integritytest of=/dev/null ------------------------- audit.log from auditd type=UNKNOWN[1336] msg=audit(1630425039.363:184): module=integrity op=ctr ppid=3807 pid=3819 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts2 ses=3 comm="integritysetup" exe="/sbin/integritysetup" subj==unconfined dev=254:3 error_msg='success' res=1 type=UNKNOWN[1336] msg=audit(1630425039.471:185): module=integrity op=dtr ppid=3807 pid=3819 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts2 ses=3 comm="integritysetup" exe="/sbin/integritysetup" subj==unconfined dev=254:3 error_msg='success' res=1 type=UNKNOWN[1336] msg=audit(1630425039.611:186): module=integrity op=ctr ppid=3807 pid=3819 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts2 ses=3 comm="integritysetup" exe="/sbin/integritysetup" subj==unconfined dev=254:3 error_msg='success' res=1 type=UNKNOWN[1336] msg=audit(1630425054.475:187): module=integrity op=dtr ppid=3807 pid=3819 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts2 ses=3 comm="integritysetup" exe="/sbin/integritysetup" subj==unconfined dev=254:3 error_msg='success' res=1 type=UNKNOWN[1336] msg=audit(1630425073.171:191): module=integrity op=ctr ppid=3807 pid=3883 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts2 ses=3 comm="integritysetup" exe="/sbin/integritysetup" subj==unconfined dev=254:3 error_msg='success' res=1 type=UNKNOWN[1336] msg=audit(1630425087.239:192): module=integrity op=dtr ppid=3807 pid=3902 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts2 ses=3 comm="integritysetup" exe="/sbin/integritysetup" subj==unconfined dev=254:3 error_msg='success' res=1 type=UNKNOWN[1336] msg=audit(1630425093.755:193): module=integrity op=ctr ppid=3807 pid=3906 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts2 ses=3 comm="integritysetup" exe="/sbin/integritysetup" subj==unconfined dev=254:3 error_msg='success' res=1 type=UNKNOWN[1337] msg=audit(1630425112.119:194): module=integrity op=integrity-checksum dev=254:3 sector=77480 res=0 type=UNKNOWN[1337] msg=audit(1630425112.119:195): module=integrity op=integrity-checksum dev=254:3 sector=77480 res=0 type=UNKNOWN[1337] msg=audit(1630425112.119:196): module=integrity op=integrity-checksum dev=254:3 sector=77480 res=0 type=UNKNOWN[1337] msg=audit(1630425112.119:197): module=integrity op=integrity-checksum dev=254:3 sector=77480 res=0 type=UNKNOWN[1337] msg=audit(1630425112.119:198): module=integrity op=integrity-checksum dev=254:3 sector=77480 res=0 type=UNKNOWN[1337] msg=audit(1630425112.119:199): module=integrity op=integrity-checksum dev=254:3 sector=77480 res=0 type=UNKNOWN[1337] msg=audit(1630425112.119:200): module=integrity op=integrity-checksum dev=254:3 sector=77480 res=0 type=UNKNOWN[1337] msg=audit(1630425112.119:201): module=integrity op=integrity-checksum dev=254:3 sector=77480 res=0 type=UNKNOWN[1337] msg=audit(1630425112.119:202): module=integrity op=integrity-checksum dev=254:3 sector=77480 res=0 type=UNKNOWN[1337] msg=audit(1630425112.119:203): module=integrity op=integrity-checksum dev=254:3 sector=77480 res=0 Signed-off-by: Michael Weiß <michael.weiss@aisec.fraunhofer.de> Signed-off-by: Paul Moore <paul@paul-moore.com> # fix audit.h numbering Signed-off-by: Mike Snitzer <snitzer@redhat.com>
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Creating audit records for mapped devices.
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*
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* Copyright (C) 2021 Fraunhofer AISEC. All rights reserved.
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*
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* Authors: Michael Weiß <michael.weiss@aisec.fraunhofer.de>
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*/
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#include <linux/audit.h>
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#include <linux/module.h>
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#include <linux/device-mapper.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include "dm-audit.h"
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#include "dm-core.h"
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static struct audit_buffer *dm_audit_log_start(int audit_type,
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const char *dm_msg_prefix,
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const char *op)
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{
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struct audit_buffer *ab;
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if (audit_enabled == AUDIT_OFF)
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return NULL;
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ab = audit_log_start(audit_context(), GFP_KERNEL, audit_type);
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if (unlikely(!ab))
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return NULL;
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audit_log_format(ab, "module=%s op=%s", dm_msg_prefix, op);
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return ab;
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}
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void dm_audit_log_ti(int audit_type, const char *dm_msg_prefix, const char *op,
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struct dm_target *ti, int result)
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{
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struct audit_buffer *ab = NULL;
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struct mapped_device *md = dm_table_get_md(ti->table);
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int dev_major = dm_disk(md)->major;
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int dev_minor = dm_disk(md)->first_minor;
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switch (audit_type) {
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case AUDIT_DM_CTRL:
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ab = dm_audit_log_start(audit_type, dm_msg_prefix, op);
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if (unlikely(!ab))
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return;
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audit_log_task_info(ab);
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audit_log_format(ab, " dev=%d:%d error_msg='%s'", dev_major,
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dev_minor, !result ? ti->error : "success");
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break;
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case AUDIT_DM_EVENT:
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ab = dm_audit_log_start(audit_type, dm_msg_prefix, op);
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if (unlikely(!ab))
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return;
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audit_log_format(ab, " dev=%d:%d sector=?", dev_major,
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dev_minor);
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break;
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default: /* unintended use */
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return;
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}
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audit_log_format(ab, " res=%d", result);
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audit_log_end(ab);
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}
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EXPORT_SYMBOL_GPL(dm_audit_log_ti);
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void dm_audit_log_bio(const char *dm_msg_prefix, const char *op,
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struct bio *bio, sector_t sector, int result)
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{
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struct audit_buffer *ab;
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int dev_major = MAJOR(bio->bi_bdev->bd_dev);
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int dev_minor = MINOR(bio->bi_bdev->bd_dev);
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ab = dm_audit_log_start(AUDIT_DM_EVENT, dm_msg_prefix, op);
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if (unlikely(!ab))
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return;
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audit_log_format(ab, " dev=%d:%d sector=%llu res=%d",
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dev_major, dev_minor, sector, result);
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audit_log_end(ab);
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}
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EXPORT_SYMBOL_GPL(dm_audit_log_bio);
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