integrity: audit update

Based on discussions on linux-audit, as per Steve Grubb's request
http://lkml.org/lkml/2009/2/6/269, the following changes were made:
- forced audit result to be either 0 or 1.
- made template names const
- Added new stand-alone message type: AUDIT_INTEGRITY_RULE

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: Steve Grubb <sgrubb@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>

include/linux/audit.h

@@ -36,7 +36,8 @@
  * 1500 - 1599 kernel LSPP events
  * 1600 - 1699 kernel crypto events
  * 1700 - 1799 kernel anomaly records
- * 1800 - 1999 future kernel use (maybe integrity labels and related events)
+ * 1800 - 1899 kernel integrity events
+ * 1900 - 1999 future kernel use
  * 2000 is for otherwise unclassified kernel audit messages (legacy)
  * 2001 - 2099 unused (kernel)
  * 2100 - 2199 user space anomaly records
@@ -130,6 +131,7 @@
 #define AUDIT_INTEGRITY_STATUS	    1802 /* Integrity enable status */
 #define AUDIT_INTEGRITY_HASH	    1803 /* Integrity HASH type */
 #define AUDIT_INTEGRITY_PCR	    1804 /* PCR invalidation msgs */
+#define AUDIT_INTEGRITY_RULE	    1805 /* policy rule */
 
 #define AUDIT_KERNEL		2000	/* Asynchronous audit record. NOT A REQUEST. */
 

security/integrity/ima/ima.h

@@ -47,7 +47,7 @@ struct ima_template_data {
 
 struct ima_template_entry {
 	u8 digest[IMA_DIGEST_SIZE];	/* sha1 or md5 measurement hash */
-	char *template_name;
+	const char *template_name;
 	int template_len;
 	struct ima_template_data template;
 };

security/integrity/ima/ima_api.c

@@ -15,7 +15,7 @@
 #include <linux/module.h>
 
 #include "ima.h"
-static char *IMA_TEMPLATE_NAME = "ima";
+static const char *IMA_TEMPLATE_NAME = "ima";
 
 /*
  * ima_store_template - store ima template measurements

security/integrity/ima/ima_audit.c

@@ -22,16 +22,18 @@ static int ima_audit;
 static int __init ima_audit_setup(char *str)
 {
 	unsigned long audit;
-	int rc;
-	char *op;
+	int rc, result = 0;
+	char *op = "ima_audit";
+	char *cause;
 
 	rc = strict_strtoul(str, 0, &audit);
 	if (rc || audit > 1)
-		printk(KERN_INFO "ima: invalid ima_audit value\n");
+		result = 1;
 	else
 		ima_audit = audit;
-	op = ima_audit ? "ima_audit_enabled" : "ima_audit_not_enabled";
-	integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL, NULL, op, 0, 0);
+	cause = ima_audit ? "enabled" : "not_enabled";
+	integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,
+			    op, cause, result, 0);
 	return 1;
 }
 __setup("ima_audit=", ima_audit_setup);
@@ -47,20 +49,21 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode,
 		return;
 
 	ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno);
-	audit_log_format(ab, "integrity: pid=%d uid=%u auid=%u",
+	audit_log_format(ab, "integrity: pid=%d uid=%u auid=%u ses=%u",
 			 current->pid, current->cred->uid,
-			 audit_get_loginuid(current));
+			 audit_get_loginuid(current),
+			 audit_get_sessionid(current));
 	audit_log_task_context(ab);
 	switch (audit_msgno) {
 	case AUDIT_INTEGRITY_DATA:
 	case AUDIT_INTEGRITY_METADATA:
 	case AUDIT_INTEGRITY_PCR:
+	case AUDIT_INTEGRITY_STATUS:
 		audit_log_format(ab, " op=%s cause=%s", op, cause);
 		break;
 	case AUDIT_INTEGRITY_HASH:
 		audit_log_format(ab, " op=%s hash=%s", op, cause);
 		break;
-	case AUDIT_INTEGRITY_STATUS:
 	default:
 		audit_log_format(ab, " op=%s", op);
 	}
@@ -73,6 +76,6 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode,
 	if (inode)
 		audit_log_format(ab, " dev=%s ino=%lu",
 				 inode->i_sb->s_id, inode->i_ino);
-	audit_log_format(ab, " res=%d", result);
+	audit_log_format(ab, " res=%d", !result ? 0 : 1);
 	audit_log_end(ab);
 }

security/integrity/ima/ima_fs.c

@@ -137,7 +137,7 @@ static int ima_measurements_show(struct seq_file *m, void *v)
 	ima_putc(m, &namelen, sizeof namelen);
 
 	/* 4th:  template name */
-	ima_putc(m, e->template_name, namelen);
+	ima_putc(m, (void *)e->template_name, namelen);
 
 	/* 5th:  template specific data */
 	ima_template_show(m, (struct ima_template_data *)&e->template,

security/integrity/ima/ima_init.c

@@ -20,7 +20,7 @@
 #include "ima.h"
 
 /* name for boot aggregate entry */
-static char *boot_aggregate_name = "boot_aggregate";
+static const char *boot_aggregate_name = "boot_aggregate";
 int ima_used_chip;
 
 /* Add the boot aggregate to the IMA measurement list and extend

security/integrity/ima/ima_policy.c

@@ -12,7 +12,6 @@
  */
 #include <linux/module.h>
 #include <linux/list.h>
-#include <linux/audit.h>
 #include <linux/security.h>
 #include <linux/magic.h>
 #include <linux/parser.h>
@@ -239,8 +238,7 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
 	char *p;
 	int result = 0;
 
-	ab = audit_log_start(current->audit_context, GFP_KERNEL,
-			     AUDIT_INTEGRITY_STATUS);
+	ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_INTEGRITY_RULE);
 
 	entry->action = -1;
 	while ((p = strsep(&rule, " \n")) != NULL) {
@@ -345,15 +343,14 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
 						   AUDIT_SUBJ_TYPE);
 			break;
 		case Opt_err:
-			printk(KERN_INFO "%s: unknown token: %s\n",
-			       __FUNCTION__, p);
+			audit_log_format(ab, "UNKNOWN=%s ", p);
 			break;
 		}
 	}
 	if (entry->action == UNKNOWN)
 		result = -EINVAL;
 
-	audit_log_format(ab, "res=%d", result);
+	audit_log_format(ab, "res=%d", !result ? 0 : 1);
 	audit_log_end(ab);
 	return result;
 }
@@ -367,7 +364,7 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
  */
 int ima_parse_add_rule(char *rule)
 {
-	const char *op = "add_rule";
+	const char *op = "update_policy";
 	struct ima_measure_rule_entry *entry;
 	int result = 0;
 	int audit_info = 0;
@@ -394,8 +391,12 @@ int ima_parse_add_rule(char *rule)
 		mutex_lock(&ima_measure_mutex);
 		list_add_tail(&entry->list, &measure_policy_rules);
 		mutex_unlock(&ima_measure_mutex);
-	} else
+	} else {
 		kfree(entry);
+		integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
+				    NULL, op, "invalid policy", result,
+				    audit_info);
+	}
 	return result;
 }