linux-kernel - [PATCH V9 3/3] audit: add audit by children of executable path

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Message-Id: <d9b6e7ce17a8ffa71fe756a06922898f54ad78e5.1438801342.git.rgb@redhat.com>
Date:	Wed,  5 Aug 2015 16:29:38 -0400
From:	Richard Guy Briggs <rgb@...hat.com>
To:	linux-audit@...hat.com, linux-kernel@...r.kernel.org
Cc:	Richard Guy Briggs <rgb@...hat.com>, sgrubb@...hat.com,
	pmoore@...hat.com, eparis@...hat.com, peter@...3.com
Subject: [PATCH V9 3/3] audit: add audit by children of executable path

This adds the ability to audit the actions of children of a not-yet-running
process.

This is a split-out of a heavily modified version of a patch originally
submitted by Eric Paris with some ideas from Peter Moody.

Cc: Peter Moody <peter@...3.com>
Cc: Eric Paris <eparis@...hat.com>
Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
---
 include/uapi/linux/audit.h |    1 +
 kernel/auditfilter.c       |    5 +++++
 kernel/auditsc.c           |   11 +++++++++++
 3 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index e2ca600..55a8dec 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -267,6 +267,7 @@
 #define AUDIT_OBJ_GID	110
 #define AUDIT_FIELD_COMPARE	111
 #define AUDIT_EXE	112
+#define AUDIT_EXE_CHILDREN	113
 
 #define AUDIT_ARG0      200
 #define AUDIT_ARG1      (AUDIT_ARG0+1)
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index c662638..802f0cc 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -406,6 +406,7 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
 			return -EINVAL;
 		break;
 	case AUDIT_EXE:
+	case AUDIT_EXE_CHILDREN:
 		if (f->op != Audit_equal)
 			return -EINVAL;
 		if (entry->rule.listnr != AUDIT_FILTER_EXIT)
@@ -547,6 +548,7 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
 			entry->rule.filterkey = str;
 			break;
 		case AUDIT_EXE:
+		case AUDIT_EXE_CHILDREN:
 			if (entry->rule.exe || f->val > PATH_MAX)
 				goto exit_free;
 			str = audit_unpack_string(&bufp, &remain, f->val);
@@ -643,6 +645,7 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
 				audit_pack_string(&bufp, krule->filterkey);
 			break;
 		case AUDIT_EXE:
+		case AUDIT_EXE_CHILDREN:
 			data->buflen += data->values[i] =
 				audit_pack_string(&bufp, audit_mark_path(krule->exe));
 			break;
@@ -710,6 +713,7 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
 				return 1;
 			break;
 		case AUDIT_EXE:
+		case AUDIT_EXE_CHILDREN:
 			/* both paths exist based on above type compare */
 			if (strcmp(audit_mark_path(a->exe),
 				   audit_mark_path(b->exe)))
@@ -838,6 +842,7 @@ struct audit_entry *audit_dupe_rule(struct audit_krule *old)
 				new->filterkey = fk;
 			break;
 		case AUDIT_EXE:
+		case AUDIT_EXE_CHILDREN:
 			err = audit_dupe_exe(new, old);
 			break;
 		}
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index e9bac2b..4f2b515 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -469,6 +469,17 @@ static int audit_filter_rules(struct task_struct *tsk,
 		case AUDIT_EXE:
 			result = audit_exe_compare(tsk, rule->exe);
 			break;
+		case AUDIT_EXE_CHILDREN:
+		{
+			struct task_struct *ptsk;
+			for (ptsk = tsk; ptsk->parent->pid > 0; ptsk = find_task_by_vpid(ptsk->parent->pid)) {
+				if (audit_exe_compare(ptsk, rule->exe)) {
+					++result;
+					break;
+				}
+			}
+		}
+			break;
 		case AUDIT_UID:
 			result = audit_uid_comparator(cred->uid, f->op, f->uid);
 			break;
-- 
1.7.1

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