From 7655973d13775fc8a939cae7ebbadf3b38209a02 Mon Sep 17 00:00:00 2001
From: netblue30 <netblue30@yahoo.com>
Date: Sat, 2 Jul 2016 07:41:19 -0400
Subject: faudit: caps

---
 src/faudit/caps.c   | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/faudit/faudit.h |  4 +++
 src/faudit/main.c   |  7 +++--
 src/faudit/pid.c    |  6 ++---
 4 files changed, 89 insertions(+), 5 deletions(-)
 create mode 100644 src/faudit/caps.c

(limited to 'src')

diff --git a/src/faudit/caps.c b/src/faudit/caps.c
new file mode 100644
index 000000000..364cfcd03
--- /dev/null
+++ b/src/faudit/caps.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2014-2016 Firejail Authors
+ *
+ * This file is part of firejail project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+#include "faudit.h"
+#include <linux/capability.h>
+
+#define MAXBUF 4098
+static int extract_caps(uint64_t *val) {
+	FILE *fp = fopen("/proc/self/status", "r");
+	if (!fp)
+		return 1;
+	
+	char buf[MAXBUF];
+	while (fgets(buf, MAXBUF, fp)) {
+		if (strncmp(buf, "CapBnd:\t", 8) == 0) {
+			char *ptr = buf + 8;
+			unsigned long long tmp;
+			sscanf(ptr, "%llx", &tmp);
+			*val = tmp;
+			fclose(fp);
+			return 0;
+		}
+	}
+
+	fclose(fp);
+	return 1;
+}
+
+// return 1 if the capability is in tbe map
+static int check_capability(uint64_t map, int cap) {
+	int i;
+	uint64_t mask = 1ULL;
+	
+	for (i = 0; i < 64; i++, mask <<= 1) {
+		if ((i == cap) && (mask & map))
+			return 1;
+	}
+
+	return 0;
+}
+
+void caps(void) {
+	uint64_t caps_val;
+	
+	if (extract_caps(&caps_val)) {
+		printf("SKIP: cannot extract capabilities on this platform\n");
+		return;
+	}
+	
+	if (caps_val) {
+		printf("BAD: the capability map is %llx, it should be all zero\n", (unsigned long long) caps_val);
+		
+		if (check_capability(caps_val, CAP_SYS_ADMIN))
+			printf("UGLY: CAP_SYS_ADMIN is enabled\n");
+		if (check_capability(caps_val, CAP_SYS_BOOT))
+			printf("UGLY: CAP_SYS_BOOT is enabled\n");
+	}
+	else
+		printf("GOOD: all capabilities are disabled\n"); 
+}
+
diff --git a/src/faudit/faudit.h b/src/faudit/faudit.h
index 9c001c285..74426ac0a 100644
--- a/src/faudit/faudit.h
+++ b/src/faudit/faudit.h
@@ -22,6 +22,7 @@
 #define FAUDIT_H
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdint.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/types.h>
@@ -34,4 +35,7 @@
 // pid.c
 void pid(void);
 
+// caps.c
+void caps(void);
+
 #endif
\ No newline at end of file
diff --git a/src/faudit/main.c b/src/faudit/main.c
index d90eb1c0b..a3407caa1 100644
--- a/src/faudit/main.c
+++ b/src/faudit/main.c
@@ -20,12 +20,15 @@
 #include "faudit.h"
 
 int main(int argc, char **argv) {
-	printf("FAUDIT: Firejail audit started\n");
+	printf("\n----- Firejail Audit: the Good, the Bad and the Ugly -----\n");
 
 	// check pid namespace
 	pid();
+	
+	// chack capabilities
+	caps();
 
-	printf("FAUDIT: Firejail audit ended\n");
+	printf("----------------------------------------------------------\n");
 	return 0;
 	
 }
diff --git a/src/faudit/pid.c b/src/faudit/pid.c
index 861324255..a6f02c051 100644
--- a/src/faudit/pid.c
+++ b/src/faudit/pid.c
@@ -69,7 +69,7 @@ void pid(void) {
 			if (strncmp(buf, kern_proc[j], strlen(kern_proc[j])) == 0) {
 				fclose(fp);
 				free(fname);
-				printf("FAUDIT: Process PID %d, not running in a PID namespace\n", getpid());
+				printf("BAD: Process PID %d, not running in a PID namespace\n", getpid());
 				return;
 			}
 			j++;
@@ -80,10 +80,10 @@ void pid(void) {
 	}
 
 
-	printf("FAUDIT: Process PID %d, running in a PID namespace\n", getpid());
+	printf("GOOD: Process PID %d, running in a PID namespace\n", getpid());
 	
 	// try to guess the type of container/sandbox
 	char *str = getenv("container");
 	if (str)
-		printf("FAUDIT: Container/sandbox: %s\n", str);
+		printf("Container/sandbox: %s\n", str);
 }
-- 
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