support for asymmetric crypto keys and new signature format

Asymmetric keys were introduced in linux-3.7 to verify the signature on
signed kernel modules. The asymmetric keys infrastructure abstracts the
signature verification from the crypto details. Asymmetric crypto keys
support allows to import X509 public key certificate in a DER format
into the kernel keyring. Asymmetric keys require a new signature format.
'evmctl -x' or 'evmctl --x509' option can be used to utilize new
signature format.

Using of key filename after the file name for signing and verification commands
is a bit odd. This patch add '--key' parameter to specify non-default key file.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>

COPYING

@@ -0,0 +1,340 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
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ChangeLog

@@ -1,3 +1,25 @@
+2012-05-18  Dmitry Kasatkin  <dmitry.kasatkin@intel.com>
+
+	version 0.3
+	* llistxattr returns 0 if there are no xattrs and it is valid
+	* Added entry type to directory hash calculation
+	* inline block variable renamed
+	* Remove forced tag creation
+	* Use libexec for programs and scripts
+	* Some files updated
+	* Do not search for algorithm as it is known
+	* Refactored to remove redundant hash initialization code
+	* Added hash calculation for special files
+
+2012-04-05  Dmitry Kasatkin  <dmitry.kasatkin@intel.com>
+
+	version 0.2
+	* added RPM & TAR building makefile rules
+	* renamed evm-utils to ima-evm-utils
+	* added command options description
+	* updated error handling
+	* refactored redundant code
+
 2012-04-02  Dmitry Kasatkin  <dmitry.kasatkin@intel.com>
 
 	version 0.1.0

INSTALL

@@ -1,8 +1,8 @@
 Installation Instructions
 *************************
 
-Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005,
-2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Copyright (C) 1994-1996, 1999-2002, 2004-2011 Free Software Foundation,
+Inc.
 
    Copying and distribution of this file, with or without modification,
 are permitted in any medium without royalty provided the copyright
@@ -226,6 +226,11 @@ order to use an ANSI C compiler:
 
 and if that doesn't work, install pre-built binaries of GCC for HP-UX.
 
+   HP-UX `make' updates targets which have the same time stamps as
+their prerequisites, which makes it generally unusable when shipped
+generated files such as `configure' are involved.  Use GNU `make'
+instead.
+
    On OSF/1 a.k.a. Tru64, some versions of the default C compiler cannot
 parse its `<wchar.h>' header file.  The option `-nodtk' can be used as
 a workaround.  If GNU CC is not installed, it is therefore recommended

Makefile.am

@@ -1,6 +1,22 @@
-SUBDIRS = src tests
+SUBDIRS = src
 
 #EXTRA_DIST = LEGAL acinclude.m4 include
 
 ACLOCAL_AMFLAGS = -I m4
 
+SRCS = $(HOME)/rpmbuild/SOURCES
+SPEC = $(PACKAGE_NAME).spec
+
+pkgname = $(PACKAGE_NAME)-$(PACKAGE_VERSION)
+tarname = $(pkgname).tar.gz
+
+$(tarname):
+	git archive --format=tar --prefix=$(pkgname)/ v$(PACKAGE_VERSION) $(FILES) | gzip >$@
+
+tar: $(tarname)
+
+rpm: $(tarname)
+	cp $(tarname) $(SRCS)/
+	rpmbuild -ba --nodeps $(SPEC)
+
+.PHONY: $(tarname)

README

@@ -1,52 +1,145 @@
+ima-evm-utils - IMA/EVM signing utility
+=========================================
 
-1. Generate private key
+Contents:
 
-# plain key
-openssl genrsa -out privkey_evm.pem 1024
+   1. Key and signature formats
+   2. Key generation
+   3. Initialization
+   4. Signing
 
-# encrypted key
-openssl genrsa -des3 -out privkey_evm.pem 1024
 
-# set password for the key
-openssl rsa -in /etc/keys/privkey_evm.pem -out privkey_evm_enc.pem -des3
+Key and signature formats
+-------------------------
+
+EVM support (v2) in latest version of the kernel adds the file system UUID to
+the HMAC calculation. It is controlled by the CONFIG_EVM_HMAC_VERSION and
+version 2 is enabled by default. To include the UUID to the signature calculation,
+it is necessary to provide '--uuid -' or '-u -' parameter to the 'sign' command.
+
+Latest kernel got IMA/EVM support for using X509 certificates and asymmetric key
+support for verifying digital signatures. The new command line parameter
+'-x' or '--x509' was added to the evmctl to enable using of X509 certificates
+and new signature format.
+
+
+Key generation
+--------------
+
+Generate private key in plain text format
+
+    $ openssl genrsa -out privkey_evm.pem 1024
+
+Generate encrypted private key
+
+    $ openssl genrsa -des3 -out privkey_evm.pem 1024
+
+Make encrypted private key from unencrypted
+
+    $ openssl rsa -in /etc/keys/privkey_evm.pem -out privkey_evm_enc.pem -des3
+
+Generate self-signed X509 certificate and private key for using kernel asymmetric
+keys support
+
+	$ openssl req -new -nodes -utf8 -sha1 -days 36500 -batch \
+	      -x509 -config x509_evm.genkey \
+	      -outform DER -out x509_evm.der -keyout privkey_evm.pem
+
+Configuration file x509_evm.genkey:
+
+	# Begining of the file
+	[ req ]
+	default_bits = 1024
+	distinguished_name = req_distinguished_name
+	prompt = no
+	string_mask = utf8only
+	x509_extensions = myexts
+
+	[ req_distinguished_name ]
+	O = Magrathea
+	CN = Glacier signing key
+	emailAddress = slartibartfast@magrathea.h2g2
+
+	[ myexts ]
+	basicConstraints=critical,CA:FALSE
+	keyUsage=digitalSignature
+	subjectKeyIdentifier=hash
+	authorityKeyIdentifier=keyid
+	# EOF
+
+
+Get public key
+
+    $ openssl rsa -pubout -in privkey_evm.pem -out pubkey_evm.pem
+
+Copy keys to /etc/keys
+
+    $ cp pubkey_evm.pem /etc/keys
+    $ scp pubkey_evm.pem target:/etc/keys
+
 or
-openssl pkcs8 -topk8 -in /etc/keys/privkey_evm.pem -out privkey_evm_enc.pem
+    $ cp x509_evm.pem /etc/keys
+    $ scp x509_evm.pem target:/etc/keys
 
-2. Generate public key
 
-openssl rsa -pubout -in privkey_evm.pem -out pubkey_evm.pem
+Initialization
+--------------
 
-3. Copy public (+private if to sign on device) key to the device/qemu /etc/keys
+IMA/EVM initialization should be normally done from initial RAM file system
+before mounting root filesystem.
 
-scp pubkey_evm.pem mad:/etc/keys
+Here is an example script /etc/initramfs-tools/scripts/local-top/ima.sh
 
-4. Load keys and enable EVM
+    # import EVM HMAC key
+    keyctl clear @u
+    keyctl add user kmk "testing123" @u
+    keyctl add encrypted evm-key "load `cat /etc/keys/evm-key`" @u
 
-evm_enable.sh
+    # import IMA public key
+    ima_id=`keyctl newring _ima @u`
+    evmctl import /etc/keys/pubkey_evm.pem $ima_id
 
-This should be done at early phase, before mounting root filesystem.
+    # import EVM public key
+    evm_id=`keyctl newring _evm @u`
+    evmctl import /etc/keys/pubkey_evm.pem $evm_id
 
-5. Sign EVM and use hash value for IMA - common case
+    # enable EVM
+    echo "1" > /sys/kernel/security/evm
 
-evmctl sign --imahash test.txt
 
-6. Sign IMA and EVM - for immutable files and modules
+Import X509 certificate into the kernel keyring (since kernel 3.9?)
 
-evmctl sign --imasig test.txt
+    $ evmctl -x import /etc/keys/x509_evm.der `keyctl search @u keyring _ima`
+    $ evmctl -x import /etc/keys/x509_evm.der `keyctl search @u keyring _evm`
 
-7. Sign whole filesystem
 
-evm_sign_all.sh
-or
-find / \( -fstype rootfs -o -fstype ext3 -o -fstype ext4 \) ! -path "/lib/modules/*" -type f -uid 0 -exec evmctl sign --imahash '{}' \;
-find /lib/modules ! -name "*.ko" -type f -uid 0 -exec evmctl sign --imahash '{}' \;
-# security.ima needs to have signature for modules
-find /lib/modules -name "*.ko" -type f -uid 0 -exec evmctl sign --imasig '{}' \;
+Signing
+-------
 
-# generate signatures in .sig files
-find /lib/modules -name "*.ko" -type f -uid 0 -exec evmctl -n --sigfile ima_sign '{}' \;
+Default public key: /etc/keys/pubkey_evm.pem
+Default private key: /etc/keys/privkey_evm.pem
+Default X509 certificate: /etc/keys/x509_evm.der
 
-8. Label filesystem in fix mode...
+Signing for using X509 certificates is done using '-x' or '--x509' parameter.
+Signing for using new the EVM HMAC format is done using '-u -' or '--uuid -' parameter.
 
-ima_fix_dir.sh <dir>
+Sign file with EVM signature and use hash value for IMA - common case
+
+    $ evmctl sign [-u -] [-x] --imahash test.txt
+
+Sign file with both IMA and EVM signatures - for immutable files
+
+    $ evmctl sign [-u -] [-x] --imasig test.txt
+
+Sign file with IMA signature - for immutable files
+
+    $ evmctl ima_sign [-x] test.txt
+
+Label whole filesystem with EVM signatures
+
+    $ find / \( -fstype rootfs -o -fstype ext4 \) -exec evmctl sign [-u -] [-x] --imahash '{}' \;
+
+Label filesystem in fix mode - kernel sets correct values to IMA and EVM xattrs
+
+    $ find / \( -fstype rootfs -o -fstype ext4 \) -exec sh -c "< '{}'" \;
 

configure.ac

@@ -1,7 +1,7 @@
 # autoconf script
 
 AC_PREREQ([2.65])
-AC_INIT(evm-utils, 0.1, dmitry.kasatkin@intel.com)
+AC_INIT(ima-evm-utils, 0.3, dmitry.kasatkin@intel.com)
 AM_INIT_AUTOMAKE(AC_PACKAGE_NAME, AC_PACKAGE_VERSION)
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])
@@ -46,8 +46,7 @@ fi
 
 AC_CONFIG_FILES([Makefile
 		src/Makefile
-		tests/Makefile
-		evm-utils.spec
+		ima-evm-utils.spec
 		])
 AC_OUTPUT
 

ima-evm-utils.spec.in

@@ -1,7 +1,7 @@
 Name:		@PACKAGE_NAME@
 Version:	@PACKAGE_VERSION@
 Release:	1%{?dist}
-Summary:	evm-utils - IMA/EVM support utilities
+Summary:	@PACKAGE_NAME@ - IMA/EVM control utility
 Group:		System/Libraries
 License:	LGPLv2
 #URL:		
@@ -12,11 +12,10 @@ BuildRequires:    autoconf
 BuildRequires:    automake
 BuildRequires:    openssl-devel
 BuildRequires:    libattr-devel
-BuildRequires:    readline-devel
 BuildRequires:    keyutils-libs-devel
 
 %description
-This library provides EVM support utilities.
+This package provide IMA/EVM control utility
 
 %prep
 %setup -q
@@ -48,6 +47,6 @@ exit 0
 %{_libdir}/*
 
 %changelog
-* Wed Jul 20 2011 Dmitry Kasatkin <dmitry.kasatkin@intel.com>
-- Initial package for MeeGo
+* Thu Apr 05 2012 Dmitry Kasatkin <dmitry.kasatkin@intel.com>
+- Initial RPM spec file
 

tests/Makefile.am

@@ -1,7 +0,0 @@
-pkglib_PROGRAMS = openclose
-
-openclose_SOURCES = openclose.c
-
-dist_pkglib_SCRIPTS = evm_enable.sh evm_genkey.sh evm_sign_all.sh evm_sign_modules.sh ima_fix_dir.sh \
-			evm_hmac_all.sh evm_hmac_modules.sh
-

tests/evm_enable.sh

@@ -1,25 +0,0 @@
-#!/bin/sh
-
-# import EVM HMAC key
-keyctl clear @u
-keyctl add user kmk "testing123" @u
-keyctl add encrypted evm-key "load `cat /etc/keys/evm-key`" @u
-
-# import Moule public key
-mod_id=`keyctl newring _module @u`
-evmctl import /etc/keys/pubkey_evm.pem $mod_id
-
-# import IMA public key
-ima_id=`keyctl newring _ima @u`
-evmctl import /etc/keys/pubkey_evm.pem $ima_id
-
-# import EVM public key
-evm_id=`keyctl newring _evm @u`
-evmctl import /etc/keys/pubkey_evm.pem $evm_id
-
-# enable EVM
-echo "1" > /sys/kernel/security/evm
-
-# enable module checking
-echo "1" > /sys/kernel/security/ima/module_check
-

tests/evm_genkey.sh

@@ -1,8 +0,0 @@
-#!/bin/sh
-
-keyctl add user kmk "testing123" @u
-key=`keyctl add encrypted evm-key "new user:kmk 32" @u`
-keyctl print $key >/etc/keys/evm-key
-
-keyctl list @u
-

tests/evm_hmac_all.sh

@@ -1,14 +0,0 @@
-#!/bin/sh
-
-verbose=""
-if [ "$1" = "-v" ] ; then
-	verbose="-v"
-	shift 1
-fi
-
-dir=${1:-/}
-
-echo "Label: $dir"
-
-find $dir \( -fstype rootfs -o -fstype ext3 -o -fstype ext4 \) \( -type f -o -type d \) -exec evmctl hmac --imahash $verbose '{}' \;
-

tests/evm_hmac_modules.sh

@@ -1,14 +0,0 @@
-#!/bin/sh
-
-verbose=""
-if [ "$1" = "-v" ] ; then
-	verbose="-v"
-	shift 1
-fi
-
-dir=${1:-/lib/modules}
-
-echo "HMAC modules: $dir"
-
-find $dir -name "*.ko" -type f -exec evmctl hmac --imasig $verbose '{}' \;
-

tests/evm_sign_all.sh

@@ -1,14 +0,0 @@
-#!/bin/sh
-
-verbose=""
-if [ "$1" = "-v" ] ; then
-	verbose="-v"
-	shift 1
-fi
-
-dir=${1:-/}
-
-echo "Label: $dir"
-
-find $dir \( -fstype rootfs -o -fstype ext3 -o -fstype ext4 \) -type f -exec evmctl sign --imahash $verbose '{}' \;
-

tests/evm_sign_modules.sh

@@ -1,14 +0,0 @@
-#!/bin/sh
-
-verbose=""
-if [ "$1" = "-v" ] ; then
-	verbose="-v"
-	shift 1
-fi
-
-dir=${1:-/lib/modules}
-
-echo "Signing modules: $dir"
-
-find $dir -name "*.ko" -type f -exec evmctl sign --imasig $verbose '{}' \;
-

tests/ima_fix_dir.sh

@@ -1,8 +0,0 @@
-#!/bin/sh
-
-dir=${1:-/}
-
-echo "Fixing dir: $dir"
-
-find $dir \( -fstype rootfs -o -fstype ext3 -o -fstype ext4 \) -type f -exec openclose '{}' \;
-

tests/openclose.c

@@ -1,20 +0,0 @@
-#include <unistd.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <stdlib.h>
-
-int main(int argc, char *argv[])
-{
-	int fd;
-
-	fd = open(argv[1], O_RDONLY);
-	if (fd < 0) {
-		perror("open()");
-		exit(1);
-	}
-
-	close(fd);
-
-	return 0;
-}
-