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Message-Id: <20201221171251.2610890-4-rgb@redhat.com>
Date: Mon, 21 Dec 2020 12:12:43 -0500
From: Richard Guy Briggs <rgb@...hat.com>
To: Linux Containers List <containers@...ts.linux-foundation.org>,
Linux-Audit Mailing List <linux-audit@...hat.com>,
LKML <linux-kernel@...r.kernel.org>
Cc: Neil Horman <nhorman@...driver.com>,
Eric Paris <eparis@...isplace.org>, mpatel@...hat.com,
Richard Guy Briggs <rgb@...hat.com>
Subject: [PATCH ghau51/ghau40 v10 03/11] auditctl: add support for AUDIT_CONTID filter
A u64 container identifier has been added to the kernel view of tasks.
This allows container orchestrators to label tasks with a unique
tamperproof identifier that gets inherited by its children to be able to
track the provenance of actions by a container.
Add support to libaudit and auditctl for the AUDIT_CONTID field to
filter based on audit container identifier. This field is specified
with the "contid" field name on the command line.
Since it is a u64 and larger than any other numeric field, send it as a
string but do the appropriate conversions on each end in each direction.
See: https://github.com/linux-audit/audit-userspace/issues/40
See: https://github.com/linux-audit/audit-kernel/issues/91
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 <rgb@...hat.com>
---
docs/auditctl.8 | 3 +++
lib/fieldtab.h | 1 +
lib/libaudit.c | 35 +++++++++++++++++++++++++++++++++++
lib/libaudit.h | 7 +++++++
src/auditctl-listing.c | 21 +++++++++++++++++++++
5 files changed, 67 insertions(+)
diff --git a/docs/auditctl.8 b/docs/auditctl.8
index 09ed2466c5d4..c6a1a62472fe 100644
--- a/docs/auditctl.8
+++ b/docs/auditctl.8
@@ -223,6 +223,9 @@ Address family number as found in /usr/include/bits/socket.h. For example, IPv4
.B sessionid
User's login session ID
.TP
+.B contid
+Process' audit container ID
+.TP
.B subj_user
Program's SE Linux User
.TP
diff --git a/lib/fieldtab.h b/lib/fieldtab.h
index b597cafb2df8..e0a49d0154bb 100644
--- a/lib/fieldtab.h
+++ b/lib/fieldtab.h
@@ -47,6 +47,7 @@ _S(AUDIT_OBJ_TYPE, "obj_type" )
_S(AUDIT_OBJ_LEV_LOW, "obj_lev_low" )
_S(AUDIT_OBJ_LEV_HIGH, "obj_lev_high" )
_S(AUDIT_SESSIONID, "sessionid" )
+_S(AUDIT_CONTID, "contid" )
_S(AUDIT_DEVMAJOR, "devmajor" )
_S(AUDIT_DEVMINOR, "devminor" )
diff --git a/lib/libaudit.c b/lib/libaudit.c
index 2c7b16ccf44e..bcef9dc7a2cc 100644
--- a/lib/libaudit.c
+++ b/lib/libaudit.c
@@ -1779,6 +1779,41 @@ int audit_rule_fieldpair_data(struct audit_rule_data **rulep, const char *pair,
if (rule->values[rule->field_count] >= AF_MAX)
return -EAU_FIELDVALTOOBIG;
break;
+ case AUDIT_CONTID: {
+ unsigned long long val;
+
+ if ((audit_get_features() &
+ AUDIT_FEATURE_BITMAP_CONTAINERID) == 0)
+ return -EAU_FIELDNOSUPPORT;
+ if (flags != AUDIT_FILTER_EXCLUDE &&
+ flags != AUDIT_FILTER_USER &&
+ flags != AUDIT_FILTER_EXIT)
+ return -EAU_FIELDNOFILTER;
+ if (isdigit((char)*(v)))
+ val = strtoull(v, NULL, 0);
+ else if (strlen(v) >= 2 && *(v) == '-' &&
+ (isdigit((char)*(v+1))))
+ val = strtoll(v, NULL, 0);
+ else if (strcmp(v, "unset") == 0)
+ val = ULLONG_MAX;
+ else
+ return -EAU_FIELDVALNUM;
+ if (errno)
+ return -EAU_FIELDVALNUM;
+ vlen = sizeof(unsigned long long);
+ rule->values[rule->field_count] = vlen;
+ offset = rule->buflen;
+ rule->buflen += vlen;
+ *rulep = realloc(rule, sizeof(*rule) + rule->buflen);
+ if (*rulep == NULL) {
+ free(rule);
+ audit_msg(LOG_ERR, "Cannot realloc memory!\n");
+ return -3;
+ }
+ rule = *rulep;
+ *(unsigned long long *)(&rule->buf[offset]) = val;
+ break;
+ }
case AUDIT_DEVMAJOR...AUDIT_INODE:
case AUDIT_SUCCESS:
if (flags != AUDIT_FILTER_EXIT)
diff --git a/lib/libaudit.h b/lib/libaudit.h
index 3b0b1e8d0d22..a252813d1f72 100644
--- a/lib/libaudit.h
+++ b/lib/libaudit.h
@@ -363,6 +363,9 @@ extern "C" {
#ifndef AUDIT_FEATURE_BITMAP_FILTER_FS
#define AUDIT_FEATURE_BITMAP_FILTER_FS 0x00000040
#endif
+#ifndef AUDIT_FEATURE_BITMAP_CONTAINERID
+#define AUDIT_FEATURE_BITMAP_CONTAINERID 0x00000080
+#endif
/* Defines for interfield comparison update */
#ifndef AUDIT_OBJ_UID
@@ -389,6 +392,10 @@ extern "C" {
#define AUDIT_FSTYPE 26
#endif
+#ifndef AUDIT_CONTID
+#define AUDIT_CONTID 27
+#endif
+
#ifndef AUDIT_COMPARE_UID_TO_OBJ_UID
#define AUDIT_COMPARE_UID_TO_OBJ_UID 1
#endif
diff --git a/src/auditctl-listing.c b/src/auditctl-listing.c
index f43e10c1af1f..710327a2c3da 100644
--- a/src/auditctl-listing.c
+++ b/src/auditctl-listing.c
@@ -25,6 +25,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <limits.h>
#include "auditctl-listing.h"
#include "private.h"
#include "auditctl-llist.h"
@@ -460,6 +461,26 @@ static void print_rule(const struct audit_rule_data *r)
audit_operator_to_symbol(op),
audit_fstype_to_name(
r->values[i]));
+ } else if (field == AUDIT_CONTID) {
+ unsigned long long val;
+
+ if (r->values[i] == sizeof(unsigned long long)) {
+ val = *(unsigned long long *)(&r->buf[boffset]);
+
+ if (val != ULLONG_MAX)
+ printf(" -F %s%s%llu", name,
+ audit_operator_to_symbol(op),
+ val);
+ else
+ printf(" -F %s%s%s", name,
+ audit_operator_to_symbol(op),
+ "unset");
+ } else {
+ printf(" -F %s%s%s", name,
+ audit_operator_to_symbol(op),
+ "inval");
+ }
+ boffset += r->values[i];
} else {
// The default is signed decimal
printf(" -F %s%s%d", name,
--
2.18.4
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