pax_global_header00006660000000000000000000000064132413023330014504gustar00rootroot0000000000000052 comment=c860e0d9bb931da3f586e50a1193cbed970cb1da ima-evm-utils-1.1/000077500000000000000000000000001324130233300140365ustar00rootroot00000000000000ima-evm-utils-1.1/.gitignore000066400000000000000000000011041324130233300160220ustar00rootroot00000000000000*.swp *~ # Generated by autotools .libs m4 .deps aclocal.m4 autom4te.cache config.guess config.log config.status config.sub configure depcomp install-sh Makefile.in Makefile !tests/data/Makefile missing compile libtool ltmain.sh # Compiled executables *.o *.a *.lo *.la src/evmctl tests/openclose config.h config.h.in stamp-h1 *.spec # But don't ignore the symlinks with the same names in this directory !tests/valgrind/* # cscope/tags tags TAGS cscope.* ncscope.* # Generated documentation *.8 *.5 manpage.links manpage.refs # quilt's files patches series # test output ima-evm-utils-1.1/AUTHORS000066400000000000000000000001771324130233300151130ustar00rootroot00000000000000Dmitry Kasatkin CONTRIBUTORS: Vivek Goyal Mimi Zohar ima-evm-utils-1.1/COPYING000066400000000000000000000432541324130233300151010ustar00rootroot00000000000000 GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Lesser General Public License instead.) You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things. 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If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors' reputations. Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. The precise terms and conditions for copying, distribution and modification follow. GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. 1. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other recipients of the Program a copy of this License along with the Program. You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. 2. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of these conditions: a) You must cause the modified files to carry prominent notices stating that you changed the files and the date of any change. b) You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License. c) If the modified program normally reads commands interactively when run, you must cause it, when started running for such interactive use in the most ordinary way, to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may redistribute the program under these conditions, and telling the user how to view a copy of this License. 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You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following: a) Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, c) Accompany it with the information you received as to the offer to distribute corresponding source code. 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If the Program specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software Foundation. 10. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally. NO WARRANTY 11. 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It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) 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. Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) year name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. , 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. ima-evm-utils-1.1/ChangeLog000066400000000000000000000053711324130233300156160ustar00rootroot000000000000002018-01-28 Mimi Zohar version 1.1 * Support the new openssl 1.1 api * Support for validating multiple pcrs * Verify the measurement list signature based on the list digest * Verify the "ima-sig" measurement list using multiple keys * Fixed parsing the measurement template data field length * Portable & immutable EVM signatures (new format) * Multiple fixes that have been lingering in the next branch. Some are for experimental features that are not yet supported in the kernel. 2014-07-30 Dmitry Kasatkin version 1.0 * Recursive hashing * Immutable EVM signatures (experimental) * Command 'ima_clear' to remove xattrs * Support for passing password to the library * Support for asking password safely from the user 2014-09-23 Dmitry Kasatkin version 0.9 * Updated README * man page generated and added to the package * Use additional SMACK xattrs for EVM signature generation * Signing functions moved to libimaevm for external use (RPM) * Fixed setting of correct hash header 2014-05-05 Dmitry Kasatkin version 0.8 * Symbilic names for keyrings * Hash list signing * License text fix for using OpenSSL * Help output fix 2014-02-17 Dmitry Kasatkin version 0.7 * Fix symbolic links related bugs * Provide recursive fixing * Provide recursive signing * Move IMA verification to the library (first for LTP use) * Support for target architecture data size * Remove obsolete module signing code * Code cleanup 2013-08-28 Dmitry Kasatkin version 0.6 * support for asymmetric crypto keys and new signature format (v2) * fixes to set correct hash algo for digital signature v1 * uuid support for EVM * signature verification support * test scripts removed * README updates 2012-05-18 Dmitry Kasatkin 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 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 version 0.1.0 * Fully functional version for lastest 3.x kernels 2011-08-24 Dmitry Kasatkin version 0.1 * Initial public version. ima-evm-utils-1.1/INSTALL000066400000000000000000000366051324130233300151010ustar00rootroot00000000000000Installation Instructions ************************* Copyright (C) 1994-1996, 1999-2002, 2004-2013 Free Software Foundation, Inc. Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. This file is offered as-is, without warranty of any kind. Basic Installation ================== Briefly, the shell commands `./configure; make; make install' should configure, build, and install this package. The following more-detailed instructions are generic; see the `README' file for instructions specific to this package. Some packages provide this `INSTALL' file but do not implement all of the features documented below. The lack of an optional feature in a given package is not necessarily a bug. More recommendations for GNU packages can be found in *note Makefile Conventions: (standards)Makefile Conventions. The `configure' shell script attempts to guess correct values for various system-dependent variables used during compilation. It uses those values to create a `Makefile' in each directory of the package. 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Until the limitation is lifted, you can use this workaround: CONFIG_SHELL=/bin/bash ./configure CONFIG_SHELL=/bin/bash `configure' Invocation ====================== `configure' recognizes the following options to control how it operates. `--help' `-h' Print a summary of all of the options to `configure', and exit. `--help=short' `--help=recursive' Print a summary of the options unique to this package's `configure', and exit. The `short' variant lists options used only in the top level, while the `recursive' variant lists options also present in any nested packages. `--version' `-V' Print the version of Autoconf used to generate the `configure' script, and exit. `--cache-file=FILE' Enable the cache: use and save the results of the tests in FILE, traditionally `config.cache'. FILE defaults to `/dev/null' to disable caching. `--config-cache' `-C' Alias for `--cache-file=config.cache'. `--quiet' `--silent' `-q' Do not print messages saying which checks are being made. To suppress all normal output, redirect it to `/dev/null' (any error messages will still be shown). `--srcdir=DIR' Look for the package's source code in directory DIR. Usually `configure' can determine that directory automatically. `--prefix=DIR' Use DIR as the installation prefix. *note Installation Names:: for more details, including other options available for fine-tuning the installation locations. `--no-create' `-n' Run the configure checks, but stop before creating any output files. `configure' also accepts some other, not widely useful, options. Run `configure --help' for more details. ima-evm-utils-1.1/Makefile.am000066400000000000000000000016601324130233300160750ustar00rootroot00000000000000SUBDIRS = src dist_man_MANS = evmctl.1 doc_DATA = examples/ima-genkey-self.sh examples/ima-genkey.sh examples/ima-gen-local-ca.sh EXTRA_DIST = autogen.sh $(doc_DATA) CLEANFILES = *.html *.xsl 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) # requires asciidoc, xslproc, docbook-xsl MANPAGE_DOCBOOK_XSL = /usr/share/xml/docbook/stylesheet/docbook-xsl/manpages/docbook.xsl evmctl.1.html: README @asciidoc -o $@ $< evmctl.1: asciidoc -d manpage -b docbook -o evmctl.1.xsl README xsltproc --nonet -o $@ $(MANPAGE_DOCBOOK_XSL) evmctl.1.xsl rm -f evmctl.1.xsl rmman: rm -f evmctl.1 doc: evmctl.1.html rmman evmctl.1 .PHONY: $(tarname) ima-evm-utils-1.1/NEWS000066400000000000000000000000001324130233300145230ustar00rootroot00000000000000ima-evm-utils-1.1/README000066400000000000000000000324451324130233300147260ustar00rootroot00000000000000EVMCTL(1) ========= NAME ---- evmctl - IMA/EVM signing utility SYNOPSIS -------- evmctl [options] [OPTIONS] DESCRIPTION ----------- The evmctl utility can be used for producing and verifying digital signatures, which are used by Linux kernel integrity subsystem (IMA/EVM). It can be also used to import keys into the kernel keyring. COMMANDS -------- --version help import [--rsa] pubkey keyring sign [-r] [--imahash | --imasig ] [--portable] [--key key] [--pass password] file verify file ima_sign [--sigfile] [--key key] [--pass password] file ima_verify file ima_hash file ima_measurement [--key "key1, key2, ..."] [--list] file ima_fix [-t fdsxm] path sign_hash [--key key] [--pass password] hmac [--imahash | --imasig ] file OPTIONS ------- -a, --hashalgo sha1 (default), sha224, sha256, sha384, sha512 -s, --imasig make IMA signature -d, --imahash make IMA hash -f, --sigfile store IMA signature in .sig file instead of xattr --rsa use RSA key type and signing scheme v1 -k, --key path to signing key (default: /etc/keys/{privkey,pubkey}_evm.pem) -o, --portable generate portable EVM signatures -p, --pass password for encrypted signing key -r, --recursive recurse into directories (sign) -t, --type file types to fix 'fdsxm' (f: file, d: directory, s: block/char/symlink) x - skip fixing if both ima and evm xattrs exist (use with caution) m - stay on the same filesystem (like 'find -xdev') -n print result to stdout instead of setting xattr -u, --uuid use custom FS UUID for EVM (unspecified: from FS, empty: do not use) --smack use extra SMACK xattrs for EVM --m32 force EVM hmac/signature for 32 bit target system --m64 force EVM hmac/signature for 64 bit target system -v increase verbosity level -h, --help display this help and exit INTRODUCTION ------------ Linux kernel integrity subsystem is comprised of a number of different components including the Integrity Measurement Architecture (IMA), Extended Verification Module (EVM), IMA-appraisal extension, digital signature verification extension and audit measurement log support. The evmctl utility is used for producing and verifying digital signatures, which are used by the Linux kernel integrity subsystem. It is also used for importing keys into the kernel keyring. Linux integrity subsystem allows to use IMA and EVM signatures. EVM signature protects file metadata, such as file attributes and extended attributes. IMA signature protects file content. For more detailed information about integrity subsystem it is recommended to follow resources in RESOURCES section. EVM HMAC and signature metadata ------------------------------- EVM protects file metadata by including following attributes into HMAC and signature calculation: inode number, inode generation, UID, GID, file mode, security.selinux, security.SMACK64, security.ima, security.capability. EVM HMAC and signature in may also include additional file and file system attributes. Currently supported additional attributes are filesystem UUID and extra SMACK extended attributes. Kernel configuration option CONFIG_EVM_ATTR_FSUUID controls whether to include filesystem UUID into HMAC and enabled by default. Therefore evmctl also includes fsuuid by default. Providing '--uuid' option without parameter allows to disable usage of fs uuid. Providing '--uuid=UUID' option with parameter allows to use custom UUID. Providing the '--portable' option will disable usage of the fs uuid and also the inode number and generation. Kernel configuration option CONFIG_EVM_EXTRA_SMACK_XATTRS controls whether to include additional SMACK extended attributes into HMAC. They are following: security.SMACK64EXEC, security.SMACK64TRANSMUTE and security.SMACK64MMAP. evmctl '--smack' options enables that. Key and signature formats ------------------------- Linux integrity subsystem supports two type of signature and respectively two key formats. First key format (v1) is pure RSA key encoded in PEM a format and uses own signature format. It is now non-default format and requires to provide evmctl '--rsa' option for signing and importing the key. Second key format uses X509 DER encoded public key certificates and uses asymmetric key support in the kernel (since kernel 3.9). CONFIG_INTEGRITY_ASYMMETRIC_KEYS must be enabled (default). Integrity keyrings ---------------- Integrity subsystem uses dedicated IMA/EVM keyrings to search for signature verification keys - '_ima' and '_evm' respectively. Since 3.13 IMA allows to declare IMA keyring as trusted. It allows only to load keys, signed by a key from the system keyring (.system). It means self-signed keys are not allowed. This is a default behavior unless CONFIG_IMA_TRUSTED_KEYRING is undefined. IMA trusted keyring is has different name '.ima'. Trusted keyring requires X509 public key certificates. Old version RSA public keys are not compatible with trusted keyring. Generate EVM encrypted keys --------------------------- EVM encrypted key is used for EVM HMAC calculation: # create and save the key kernel master key (user type) # LMK is used to encrypt encrypted keys keyctl add user kmk "`dd if=/dev/urandom bs=1 count=32 2>/dev/null`" @u keyctl pipe `keyctl search @u user kmk` > /etc/keys/kmk # create the EVM encrypted key keyctl add encrypted evm-key "new user:kmk 64" @u keyctl pipe `keyctl search @u encrypted evm-key` >/etc/keys/evm-key Generate EVM trusted keys (TPM based) ------------------------------------- Trusted EVM keys are keys which a generate with the help of TPM. They are not related to integrity trusted keys. # create and save the key kernel master key (user type) keyctl add trusted kmk "new 32" @u keyctl pipe `keyctl search @u trusted kmk` >kmk # create the EVM trusted key keyctl add encrypted evm-key "new trusted:kmk 32" @u keyctl pipe `keyctl search @u encrypted evm-key` >evm-key Generate signing and verification keys -------------------------------------- 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 public key 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 Generate public key for using RSA key format: 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 cp x509_evm.pem /etc/keys scp x509_evm.pem target:/etc/keys Generate trusted keys --------------------- Generation of trusted keys is a bit more complicated process and involves following steps: * Creation of local IMA certification authority (CA). It consist of private and public key certificate which are used to sign and verify other keys. * Build Linux kernel with embedded local IMA CA X509 certificate. It is used to verify other keys added to the '.ima' trusted keyring * Generate IMA private signing key and verification public key certificate, which is signed using local IMA CA private key. Configuration file ima-local-ca.genkey: # Begining of the file [ req ] default_bits = 2048 distinguished_name = req_distinguished_name prompt = no string_mask = utf8only x509_extensions = v3_ca [ req_distinguished_name ] O = IMA-CA CN = IMA/EVM certificate signing key emailAddress = ca@ima-ca [ v3_ca ] basicConstraints=CA:TRUE subjectKeyIdentifier=hash authorityKeyIdentifier=keyid:always,issuer # keyUsage = cRLSign, keyCertSign # EOF Generate private key and X509 public key certificate: openssl req -new -x509 -utf8 -sha1 -days 3650 -batch -config $GENKEY \ -outform DER -out ima-local-ca.x509 -keyout ima-local-ca.priv Produce X509 in DER format for using while building the kernel: openssl x509 -inform DER -in ima-local-ca.x509 -out ima-local-ca.pem Configuration file ima.genkey: # Begining of the file [ req ] default_bits = 1024 distinguished_name = req_distinguished_name prompt = no string_mask = utf8only x509_extensions = v3_usr [ req_distinguished_name ] O = `hostname` CN = `whoami` signing key emailAddress = `whoami`@`hostname` [ v3_usr ] basicConstraints=critical,CA:FALSE #basicConstraints=CA:FALSE keyUsage=digitalSignature #keyUsage = nonRepudiation, digitalSignature, keyEncipherment subjectKeyIdentifier=hash authorityKeyIdentifier=keyid #authorityKeyIdentifier=keyid,issuer # EOF Generate private key and X509 public key certificate signing request: openssl req -new -nodes -utf8 -sha1 -days 365 -batch -config $GENKEY \ -out csr_ima.pem -keyout privkey_ima.pem Sign X509 public key certificate signing request with local IMA CA private key: openssl x509 -req -in csr_ima.pem -days 365 -extfile $GENKEY -extensions v3_usr \ -CA ima-local-ca.pem -CAkey ima-local-ca.priv -CAcreateserial \ -outform DER -out x509_ima.der Sign file data and metadata --------------------------- Default key locations: Private RSA key: /etc/keys/privkey_evm.pem Public RSA key: /etc/keys/pubkey_evm.pem X509 certificate: /etc/keys/x509_evm.der Options to remember: '-k', '-r', '--rsa', '--uuid', '--smack'. Sign file with EVM signature and calculate hash value for IMA: evmctl sign --imahash test.txt Sign file with both IMA and EVM signatures: evmctl sign --imasig test.txt: Sign file with IMA signature: evmctl ima_sign test.txt Sign recursively whole filesystem: evmctl -r sign --imahash / Fix recursively whole filesystem: evmctl -r ima_fix / Sign filesystem selectively using 'find' command: find / \( -fstype rootfs -o -fstype ext4 \) -exec evmctl sign --imahash '{}' \; Fix filesystem selectively using 'find' command: find / \( -fstype rootfs -o -fstype ext4 \) -exec sh -c "< '{}'" \; Initialize IMA/EVM at early boot -------------------------------- IMA/EVM initialization should be normally done from initial RAM file system before mounting root filesystem. Here is Ubuntu initramfs example script (/etc/initramfs-tools/scripts/local-top/ima.sh) # mount securityfs if not mounted SECFS=/sys/kernel/security grep -q $SECFS /proc/mounts || mount -n -t securityfs securityfs $SECFS # search for IMA trusted keyring, then for untrusted ima_id="`awk '/\.ima/ { printf "%d", "0x"$1; }' /proc/keys`" if [ -z "$ima_id" ]; then ima_id=`keyctl search @u keyring _ima 2>/dev/null` if [ -z "$ima_id" ]; then ima_id=`keyctl newring _ima @u` fi fi # import IMA X509 certificate evmctl import /etc/keys/x509_ima.der $ima_id # search for EVM keyring evm_id=`keyctl search @u keyring _evm 2>/dev/null` if [ -z "$evm_id" ]; then evm_id=`keyctl newring _evm @u` fi # import EVM X509 certificate evmctl import /etc/keys/x509_evm.der $evm_id # a) import EVM encrypted key cat /etc/keys/kmk | keyctl padd user kmk @u keyctl add encrypted evm-key "load `cat /etc/keys/evm-key`" @u # OR # b) import EVM trusted key keyctl add trusted kmk "load `cat /etc/keys/kmk`" @u keyctl add encrypted evm-key "load `cat /etc/keys/evm-key`" @u # enable EVM echo "1" > /sys/kernel/security/evm Optionally it is possible also to forbid adding, removing of new public keys and certificates into keyrings and revoking keys using 'keyctl setperm' command: # protect EVM keyring keyctl setperm $evm_id 0x0b0b0000 # protect IMA keyring keyctl setperm $ima_id 0x0b0b0000 # protecting IMA key from revoking (against DoS) ima_key=`evmctl import /etc/keys/x509_ima.der $ima_id` keyctl setperm $ima_key 0x0b0b0000 When using plain RSA public keys in PEM format, use 'evmctl import --rsa' for importing keys: evmctl import --rsa /etc/keys/pubkey_evm.pem $evm_id Latest version of keyctl allows to import X509 public key certificates: cat /etc/keys/x509_ima.der | keyctl padd asymmetric '' $ima_id FILES ----- Examples of scripts to generate X509 public key certificates: /usr/share/doc/ima-evm-utils/ima-genkey-self.sh /usr/share/doc/ima-evm-utils/ima-genkey.sh /usr/share/doc/ima-evm-utils/ima-gen-local-ca.sh AUTHOR ------ Written by Dmitry Kasatkin, and others. RESOURCES --------- http://sourceforge.net/p/linux-ima/wiki/Home http://sourceforge.net/p/linux-ima/ima-evm-utils COPYING ------- Copyright \(C) 2012 - 2014 Linux Integrity Project. Free use of this software is granted under the terms of the GNU Public License (GPL). ima-evm-utils-1.1/acinclude.m4000066400000000000000000000006231324130233300162300ustar00rootroot00000000000000 AC_DEFUN([PKG_ARG_ENABLE], [ AC_MSG_CHECKING(whether to enable $1) AC_ARG_ENABLE([$1], AC_HELP_STRING([--enable-$1], [enable $1 (default is $2)]), [pkg_cv_enable_$1=$enableval], [AC_CACHE_VAL([pkg_cv_enable_$1], [pkg_cv_enable_$1=$2])]) if test $pkg_cv_enable_$1 = yes; then AC_DEFINE([$3],, [$4]) fi AC_MSG_RESULT([$pkg_cv_enable_$1]) AM_CONDITIONAL($3, test $pkg_cv_enable_$1 = yes) ]) ima-evm-utils-1.1/autogen.sh000077500000000000000000000004331324130233300160370ustar00rootroot00000000000000#! /bin/sh set -e # new way # strange, but need this for Makefile.am, because it has -I m4 test -d m4 || mkdir m4 autoreconf -f -i # old way #libtoolize --automake --copy --force #aclocal #autoconf --force #autoheader --force #automake --add-missing --copy --force-missing --gnu ima-evm-utils-1.1/build-static.sh000077500000000000000000000001611324130233300167570ustar00rootroot00000000000000#!/bin/sh gcc -static -o evmctl.static -include config.h src/evmctl.c src/libimaevm.c -lcrypto -lkeyutils -ldl ima-evm-utils-1.1/configure.ac000066400000000000000000000027411324130233300163300ustar00rootroot00000000000000# autoconf script AC_PREREQ([2.65]) AC_INIT(ima-evm-utils, 1.1, zohar@linux.vnet.ibm.com) AM_INIT_AUTOMAKE AC_CONFIG_HEADERS([config.h]) AC_CONFIG_MACRO_DIR([m4]) AC_CANONICAL_HOST # Checks for programs. AC_PROG_CC AM_PROG_CC_C_O #AC_PROG_CXX #AC_PROG_CPP AC_PROG_INSTALL AC_PROG_LIBTOOL #AC_PROG_LN_S LT_INIT # FIXME: Replace `main' with a function in `-lpthread': #AC_CHECK_LIB([pthread], [main]) # Checks for header files. AC_HEADER_STDC PKG_CHECK_MODULES(OPENSSL, [ openssl >= 0.9.8 ]) AC_SUBST(OPENSSL_CFLAGS) AC_SUBST(OPENSSL_LIBS) AC_CHECK_HEADER(unistd.h) AC_CHECK_HEADERS(openssl/conf.h) AC_CHECK_HEADERS(attr/xattr.h, , [AC_MSG_ERROR([attr/xattr.h header not found. You need the libattr development package.])]) AC_CHECK_HEADERS(keyutils.h, , [AC_MSG_ERROR([keyutils.h header not found. You need the libkeyutils development package.])]) #debug support - yes for a while PKG_ARG_ENABLE(debug, "yes", DEBUG, [Enable Debug support]) if test $pkg_cv_enable_debug = yes; then CFLAGS="$CFLAGS -g -O1 -Wall -Wstrict-prototypes -pipe" else CFLAGS="$CFLAGS -Wall -Wstrict-prototypes -pipe -fomit-frame-pointer" fi # for gcov #CFLAGS="$CFLAGS -Wall -fprofile-arcs -ftest-coverage" #CXXFLAGS="$CXXFLAGS -Wall -fprofile-arcs -ftest-coverage" #LDFLAGS="$LDFLAGS -fprofile-arcs" #DISTCLEANFILES="*.gcno *.gcda" AC_CONFIG_FILES([Makefile src/Makefile packaging/ima-evm-utils.spec ]) AC_OUTPUT # Give some feedback echo echo echo "Configuration:" echo " debug: $pkg_cv_enable_debug" echo ima-evm-utils-1.1/examples/000077500000000000000000000000001324130233300156545ustar00rootroot00000000000000ima-evm-utils-1.1/examples/ima-gen-local-ca.sh000077500000000000000000000012111324130233300211740ustar00rootroot00000000000000#!/bin/sh GENKEY=ima-local-ca.genkey cat << __EOF__ >$GENKEY [ req ] default_bits = 2048 distinguished_name = req_distinguished_name prompt = no string_mask = utf8only x509_extensions = v3_ca [ req_distinguished_name ] O = IMA-CA CN = IMA/EVM certificate signing key emailAddress = ca@ima-ca [ v3_ca ] basicConstraints=CA:TRUE subjectKeyIdentifier=hash authorityKeyIdentifier=keyid:always,issuer # keyUsage = cRLSign, keyCertSign __EOF__ openssl req -new -x509 -utf8 -sha1 -days 3650 -batch -config $GENKEY \ -outform DER -out ima-local-ca.x509 -keyout ima-local-ca.priv openssl x509 -inform DER -in ima-local-ca.x509 -out ima-local-ca.pem ima-evm-utils-1.1/examples/ima-genkey-self.sh000077500000000000000000000011651324130233300211730ustar00rootroot00000000000000#!/bin/sh GENKEY=x509_evm.genkey cat << __EOF__ >$GENKEY [ req ] default_bits = 1024 distinguished_name = req_distinguished_name prompt = no string_mask = utf8only x509_extensions = myexts [ req_distinguished_name ] O = `hostname` CN = `whoami` signing key emailAddress = `whoami`@`hostname` [ myexts ] basicConstraints=critical,CA:FALSE keyUsage=digitalSignature subjectKeyIdentifier=hash authorityKeyIdentifier=keyid __EOF__ openssl req -x509 -new -nodes -utf8 -sha1 -days 3650 -batch -config $GENKEY \ -outform DER -out x509_evm.der -keyout privkey_evm.pem openssl rsa -pubout -in privkey_evm.pem -out pubkey_evm.pem ima-evm-utils-1.1/examples/ima-genkey.sh000077500000000000000000000015211324130233300202400ustar00rootroot00000000000000#!/bin/sh GENKEY=ima.genkey cat << __EOF__ >$GENKEY [ req ] default_bits = 1024 distinguished_name = req_distinguished_name prompt = no string_mask = utf8only x509_extensions = v3_usr [ req_distinguished_name ] O = `hostname` CN = `whoami` signing key emailAddress = `whoami`@`hostname` [ v3_usr ] basicConstraints=critical,CA:FALSE #basicConstraints=CA:FALSE keyUsage=digitalSignature #keyUsage = nonRepudiation, digitalSignature, keyEncipherment subjectKeyIdentifier=hash authorityKeyIdentifier=keyid #authorityKeyIdentifier=keyid,issuer __EOF__ openssl req -new -nodes -utf8 -sha1 -days 365 -batch -config $GENKEY \ -out csr_ima.pem -keyout privkey_ima.pem openssl x509 -req -in csr_ima.pem -days 365 -extfile $GENKEY -extensions v3_usr \ -CA ima-local-ca.pem -CAkey ima-local-ca.priv -CAcreateserial \ -outform DER -out x509_ima.der ima-evm-utils-1.1/packaging/000077500000000000000000000000001324130233300157625ustar00rootroot00000000000000ima-evm-utils-1.1/packaging/ima-evm-utils.spec000066400000000000000000000015621324130233300213330ustar00rootroot00000000000000Name: ima-evm-utils Version: 1.1 Release: 1%{?dist} Summary: ima-evm-utils - IMA/EVM control utility Group: System/Libraries License: GPLv2 #URL: Source0: %{name}-%{version}.tar.gz BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root BuildRequires: autoconf BuildRequires: automake BuildRequires: openssl-devel BuildRequires: libattr-devel BuildRequires: keyutils-libs-devel %description This package provide IMA/EVM control utility %prep %setup -q %build ./autogen.sh %configure --prefix=/usr make %install rm -rf %{buildroot} make DESTDIR=%{buildroot} install %clean rm -rf %{buildroot} %post /sbin/ldconfig exit 0 %preun -p /sbin/ldconfig %postun /sbin/ldconfig %files %defattr(-,root,root,-) %{_bindir}/* %{_libdir}/libimaevm.* %{_includedir}/* %changelog * Thu Apr 05 2012 Dmitry Kasatkin - Initial RPM spec file ima-evm-utils-1.1/packaging/ima-evm-utils.spec.in000066400000000000000000000016021324130233300217330ustar00rootroot00000000000000Name: @PACKAGE_NAME@ Version: @PACKAGE_VERSION@ Release: 1%{?dist} Summary: @PACKAGE_NAME@ - IMA/EVM control utility Group: System/Libraries License: GPLv2 #URL: Source0: %{name}-%{version}.tar.gz BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root BuildRequires: autoconf BuildRequires: automake BuildRequires: openssl-devel BuildRequires: libattr-devel BuildRequires: keyutils-libs-devel %description This package provide IMA/EVM control utility %prep %setup -q %build ./autogen.sh %configure --prefix=/usr make %install rm -rf %{buildroot} make DESTDIR=%{buildroot} install %clean rm -rf %{buildroot} %post /sbin/ldconfig exit 0 %preun -p /sbin/ldconfig %postun /sbin/ldconfig %files %defattr(-,root,root,-) %{_bindir}/* %{_libdir}/libimaevm.* %{_includedir}/* %changelog * Thu Apr 05 2012 Dmitry Kasatkin - Initial RPM spec file ima-evm-utils-1.1/src/000077500000000000000000000000001324130233300146255ustar00rootroot00000000000000ima-evm-utils-1.1/src/Makefile.am000066400000000000000000000010401324130233300166540ustar00rootroot00000000000000lib_LTLIBRARIES = libimaevm.la libimaevm_la_SOURCES = libimaevm.c libimaevm_la_CPPFLAGS = $(OPENSSL_CFLAGS) # current[:revision[:age]] # result: [current-age].age.revision libimaevm_la_LDFLAGS = -version-info 0:0:0 libimaevm_la_LIBADD = $(OPENSSL_LIBS) include_HEADERS = imaevm.h bin_PROGRAMS = evmctl evmctl_SOURCES = evmctl.c evmctl_CPPFLAGS = $(OPENSSL_CFLAGS) evmctl_LDFLAGS = $(LDFLAGS_READLINE) evmctl_LDADD = $(OPENSSL_LIBS) -lkeyutils libimaevm.la INCLUDES = -I$(top_srcdir) -include config.h DISTCLEANFILES = @DISTCLEANFILES@ ima-evm-utils-1.1/src/evmctl.c000066400000000000000000001177671324130233300163060ustar00rootroot00000000000000/* * ima-evm-utils - IMA/EVM support utilities * * Copyright (C) 2011 Nokia Corporation * Copyright (C) 2011,2012,2013 Intel Corporation * Copyright (C) 2013,2014 Samsung Electronics * * Authors: * Dmitry Kasatkin * * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * 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, see . * * As a special exception, the copyright holders give permission to link the * code of portions of this program with the OpenSSL library under certain * conditions as described in each individual source file and distribute * linked combinations including the program with the OpenSSL library. You * must comply with the GNU General Public License in all respects * for all of the code used other than as permitted herein. If you modify * file(s) with this exception, you may extend this exception to your * version of the file(s), but you are not obligated to do so. If you do not * wish to do so, delete this exception statement from your version. If you * delete this exception statement from all source files in the program, * then also delete it in the license file. * * File: evmctl.c * IMA/EVM control program */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define USE_FPRINTF #include "imaevm.h" static char *evm_default_xattrs[] = { XATTR_NAME_SELINUX, XATTR_NAME_SMACK, XATTR_NAME_IMA, XATTR_NAME_CAPS, NULL }; static char *evm_extra_smack_xattrs[] = { XATTR_NAME_SELINUX, XATTR_NAME_SMACK, XATTR_NAME_SMACKEXEC, XATTR_NAME_SMACKTRANSMUTE, XATTR_NAME_SMACKMMAP, XATTR_NAME_IMA, XATTR_NAME_CAPS, NULL }; static char **evm_config_xattrnames = evm_default_xattrs; struct command { char *name; int (*func)(struct command *cmd); int cmd; char *arg; char *msg; /* extra info message */ }; static int g_argc; static char **g_argv; static int xattr = 1; static bool check_xattr; static int sigdump; static int digest; static int digsig; static int sigfile; static char *uuid_str; static char *ino_str; static char *uid_str; static char *gid_str; static char *mode_str; static char *generation_str; static char *caps_str; static char *ima_str; static char *selinux_str; static char *search_type; static int measurement_list; static int recursive; static int msize; static dev_t fs_dev; static bool evm_immutable; static bool evm_portable; #define HMAC_FLAG_NO_UUID 0x0001 #define HMAC_FLAG_CAPS_SET 0x0002 static unsigned long hmac_flags; typedef int (*find_cb_t)(const char *path); static int find(const char *path, int dts, find_cb_t func); #define REG_MASK (1 << DT_REG) #define DIR_MASK (1 << DT_DIR) #define LNK_MASK (1 << DT_LNK) #define CHR_MASK (1 << DT_CHR) #define BLK_MASK (1 << DT_BLK) struct command cmds[]; static void print_usage(struct command *cmd); static int bin2file(const char *file, const char *ext, const unsigned char *data, int len) { FILE *fp; char name[strlen(file) + (ext ? strlen(ext) : 0) + 2]; int err; if (ext) sprintf(name, "%s.%s", file, ext); else sprintf(name, "%s", file); log_info("Writing to %s\n", name); fp = fopen(name, "w"); if (!fp) { log_err("Failed to open: %s\n", name); return -1; } err = fwrite(data, len, 1, fp); fclose(fp); return err; } static unsigned char *file2bin(const char *file, const char *ext, int *size) { FILE *fp; int len; unsigned char *data; char name[strlen(file) + (ext ? strlen(ext) : 0) + 2]; if (ext) sprintf(name, "%s.%s", file, ext); else sprintf(name, "%s", file); log_info("Reading to %s\n", name); len = get_filesize(name); fp = fopen(name, "r"); if (!fp) { log_err("Failed to open: %s\n", name); return NULL; } data = malloc(len); if (!fread(data, len, 1, fp)) len = 0; fclose(fp); *size = len; return data; } static int find_xattr(const char *list, int list_size, const char *xattr) { int len; for (; list_size > 0; len++, list_size -= len, list += len) { len = strlen(list); if (!strcmp(list, xattr)) return 1; } return 0; } static int hex_to_bin(char ch) { if ((ch >= '0') && (ch <= '9')) return ch - '0'; ch = tolower(ch); if ((ch >= 'a') && (ch <= 'f')) return ch - 'a' + 10; return -1; } static int hex2bin(void *dst, const char *src, size_t count) { int hi, lo; while (count--) { if (*src == ' ') src++; hi = hex_to_bin(*src++); lo = hex_to_bin(*src++); if ((hi < 0) || (lo < 0)) return -1; *(uint8_t *)dst++ = (hi << 4) | lo; } return 0; } #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] const char hex_asc[] = "0123456789abcdef"; /* this is faster than fprintf - makes sense? */ static void bin2hex(uint8_t *buf, size_t buflen, FILE *stream) { char asciihex[2]; for (; buflen--; buf++) { asciihex[0] = hex_asc_hi(*buf); asciihex[1] = hex_asc_lo(*buf); fwrite(asciihex, 2, 1, stream); } } static int pack_uuid(const char *uuid_str, char *uuid) { int i; char *to = uuid; for (i = 0; i < 16; ++i) { if (!uuid_str[0] || !uuid_str[1]) { log_err("wrong UUID format\n"); return -1; } *to++ = (hex_to_bin(*uuid_str) << 4) | (hex_to_bin(*(uuid_str + 1))); uuid_str += 2; switch (i) { case 3: case 5: case 7: case 9: if (*uuid_str != '-') { log_err("wrong UUID format\n"); return -1; } uuid_str++; continue; } } log_info("uuid: "); log_dump(uuid, 16); return 0; } static int get_uuid(struct stat *st, char *uuid) { uint32_t dev; unsigned minor, major; char path[PATH_MAX], _uuid[37]; FILE *fp; size_t len; if (uuid_str) return pack_uuid(uuid_str, uuid); dev = st->st_dev; major = (dev & 0xfff00) >> 8; minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); log_debug("dev: %u:%u\n", major, minor); sprintf(path, "blkid -s UUID -o value /dev/block/%u:%u", major, minor); fp = popen(path, "r"); if (!fp) goto err; len = fread(_uuid, 1, sizeof(_uuid), fp); pclose(fp); if (len != sizeof(_uuid)) goto err; return pack_uuid(_uuid, uuid); err: log_err("Failed to read UUID. Root access might require.\n"); return -1; } static int calc_evm_hash(const char *file, unsigned char *hash) { struct stat st; int err; uint32_t generation = 0; EVP_MD_CTX *pctx; unsigned int mdlen; char **xattrname; char xattr_value[1024]; char list[1024]; ssize_t list_size; char uuid[16]; struct h_misc_64 hmac_misc; int hmac_size; #if OPENSSL_VERSION_NUMBER < 0x10100000 EVP_MD_CTX ctx; pctx = &ctx; #else pctx = EVP_MD_CTX_new(); #endif if (lstat(file, &st)) { log_err("Failed to stat: %s\n", file); return -1; } if (generation_str) generation = strtoul(generation_str, NULL, 10); if (ino_str) st.st_ino = strtoul(ino_str, NULL, 10); if (uid_str) st.st_uid = strtoul(uid_str, NULL, 10); if (gid_str) st.st_gid = strtoul(gid_str, NULL, 10); if (mode_str) st.st_mode = strtoul(mode_str, NULL, 10); if (!evm_immutable) { if ((S_ISREG(st.st_mode) || S_ISDIR(st.st_mode)) && !generation_str) { /* we cannot at the momement to get generation of special files kernel API does not support it */ int fd = open(file, 0); if (fd < 0) { log_err("Failed to open: %s\n", file); return -1; } if (ioctl(fd, FS_IOC_GETVERSION, &generation)) { log_err("ioctl() failed\n"); close(fd); return -1; } close(fd); } log_info("generation: %u\n", generation); } list_size = llistxattr(file, list, sizeof(list)); if (list_size < 0) { log_err("llistxattr() failed\n"); return -1; } err = EVP_DigestInit(pctx, EVP_sha1()); if (!err) { log_err("EVP_DigestInit() failed\n"); return 1; } for (xattrname = evm_config_xattrnames; *xattrname != NULL; xattrname++) { if (!strcmp(*xattrname, XATTR_NAME_SELINUX) && selinux_str) { strcpy(xattr_value, selinux_str); err = strlen(selinux_str) + 1; } else if (!strcmp(*xattrname, XATTR_NAME_IMA) && ima_str) { hex2bin(xattr_value, ima_str, strlen(ima_str) / 2); err = strlen(ima_str) / 2; } else if (!strcmp(*xattrname, XATTR_NAME_CAPS) && (hmac_flags & HMAC_FLAG_CAPS_SET)) { if (!caps_str) continue; strcpy(xattr_value, caps_str); err = strlen(caps_str); } else { err = lgetxattr(file, *xattrname, xattr_value, sizeof(xattr_value)); if (err < 0) { log_info("no xattr: %s\n", *xattrname); continue; } if (!find_xattr(list, list_size, *xattrname)) { log_info("skipping xattr: %s\n", *xattrname); continue; } } /*log_debug("name: %s, value: %s, size: %d\n", *xattrname, xattr_value, err);*/ log_info("name: %s, size: %d\n", *xattrname, err); log_debug_dump(xattr_value, err); err = EVP_DigestUpdate(pctx, xattr_value, err); if (!err) { log_err("EVP_DigestUpdate() failed\n"); return 1; } } memset(&hmac_misc, 0, sizeof(hmac_misc)); if (evm_immutable) { struct h_misc_digsig *hmac = (struct h_misc_digsig *)&hmac_misc; hmac_size = sizeof(*hmac); hmac->uid = st.st_uid; hmac->gid = st.st_gid; hmac->mode = st.st_mode; } else if (msize == 0) { struct h_misc *hmac = (struct h_misc *)&hmac_misc; hmac_size = sizeof(*hmac); if (!evm_portable) { hmac->ino = st.st_ino; hmac->generation = generation; } hmac->uid = st.st_uid; hmac->gid = st.st_gid; hmac->mode = st.st_mode; } else if (msize == 64) { struct h_misc_64 *hmac = (struct h_misc_64 *)&hmac_misc; hmac_size = sizeof(*hmac); if (!evm_portable) { hmac->ino = st.st_ino; hmac->generation = generation; } hmac->uid = st.st_uid; hmac->gid = st.st_gid; hmac->mode = st.st_mode; } else { struct h_misc_32 *hmac = (struct h_misc_32 *)&hmac_misc; hmac_size = sizeof(*hmac); if (!evm_portable) { hmac->ino = st.st_ino; hmac->generation = generation; } hmac->uid = st.st_uid; hmac->gid = st.st_gid; hmac->mode = st.st_mode; } log_debug("hmac_misc (%d): ", hmac_size); log_debug_dump(&hmac_misc, hmac_size); err = EVP_DigestUpdate(pctx, &hmac_misc, hmac_size); if (!err) { log_err("EVP_DigestUpdate() failed\n"); return 1; } if (!evm_immutable && !evm_portable && !(hmac_flags & HMAC_FLAG_NO_UUID)) { err = get_uuid(&st, uuid); if (err) return -1; err = EVP_DigestUpdate(pctx, (const unsigned char *)uuid, sizeof(uuid)); if (!err) { log_err("EVP_DigestUpdate() failed\n"); return 1; } } err = EVP_DigestFinal(pctx, hash, &mdlen); if (!err) { log_err("EVP_DigestFinal() failed\n"); return 1; } return mdlen; } static int sign_evm(const char *file, const char *key) { unsigned char hash[20]; unsigned char sig[1024]; int len, err; len = calc_evm_hash(file, hash); if (len <= 1) return len; len = sign_hash("sha1", hash, len, key, NULL, sig + 1); if (len <= 1) return len; /* add header */ len++; if (evm_portable) sig[0] = EVM_XATTR_PORTABLE_DIGSIG; else sig[0] = EVM_IMA_XATTR_DIGSIG; if (evm_immutable) sig[1] = 3; /* immutable signature version */ if (sigdump || params.verbose >= LOG_INFO) dump(sig, len); if (xattr) { err = lsetxattr(file, "security.evm", sig, len, 0); if (err < 0) { log_err("setxattr failed: %s\n", file); return err; } } return 0; } static int hash_ima(const char *file) { unsigned char hash[66]; /* MAX hash size + 2 */ int len, err, offset; int algo = get_hash_algo(params.hash_algo); if (algo > PKEY_HASH_SHA1) { hash[0] = IMA_XATTR_DIGEST_NG; hash[1] = algo; offset = 2; } else { hash[0] = IMA_XATTR_DIGEST; offset = 1; } len = ima_calc_hash(file, hash + offset); if (len <= 1) return len; len += offset; if (params.verbose >= LOG_INFO) log_info("hash: "); if (sigdump || params.verbose >= LOG_INFO) dump(hash, len); if (xattr) { err = lsetxattr(file, "security.ima", hash, len, 0); if (err < 0) { log_err("setxattr failed: %s\n", file); return err; } } return 0; } static int sign_ima(const char *file, const char *key) { unsigned char hash[64]; unsigned char sig[1024]; int len, err; len = ima_calc_hash(file, hash); if (len <= 1) return len; len = sign_hash(params.hash_algo, hash, len, key, NULL, sig + 1); if (len <= 1) return len; /* add header */ len++; sig[0] = EVM_IMA_XATTR_DIGSIG; if (sigdump || params.verbose >= LOG_INFO) dump(sig, len); if (sigfile) bin2file(file, "sig", sig, len); if (xattr) { err = lsetxattr(file, "security.ima", sig, len, 0); if (err < 0) { log_err("setxattr failed: %s\n", file); return err; } } return 0; } static int get_file_type(const char *path, const char *search_type) { int err, dts = 0, i; struct stat st; for (i = 0; search_type[i]; i++) { switch (search_type[i]) { case 'f': dts |= REG_MASK; break; case 'd': dts |= DIR_MASK; break; case 's': dts |= BLK_MASK | CHR_MASK | LNK_MASK; break; case 'x': check_xattr = true; break; case 'm': /* stay within the same filesystem*/ err = lstat(path, &st); if (err < 0) { log_err("Failed to stat: %s\n", path); return err; } fs_dev = st.st_dev; /* filesystem to start from */ break; } } return dts; } static int do_cmd(struct command *cmd, find_cb_t func) { char *path = g_argv[optind++]; int err, dts = REG_MASK; /* only regular files by default */ if (!path) { log_err("Parameters missing\n"); print_usage(cmd); return -1; } if (recursive) { if (search_type) { dts = get_file_type(path, search_type); if (dts < 0) return dts; } err = find(path, dts, func); } else { err = func(path); } return err; } static int cmd_hash_ima(struct command *cmd) { return do_cmd(cmd, hash_ima); } static int sign_ima_file(const char *file) { const char *key; key = params.keyfile ? : "/etc/keys/privkey_evm.pem"; return sign_ima(file, key); } static int cmd_sign_ima(struct command *cmd) { return do_cmd(cmd, sign_ima_file); } static int cmd_sign_hash(struct command *cmd) { const char *key; char *token, *line = NULL; int hashlen = 0; size_t line_len; ssize_t len; unsigned char hash[64]; unsigned char sig[1024] = "\x03"; int siglen; key = params.keyfile ? : "/etc/keys/privkey_evm.pem"; /* support reading hash (eg. output of shasum) */ while ((len = getline(&line, &line_len, stdin)) > 0) { /* remove end of line */ if (line[len - 1] == '\n') line[--len] = '\0'; /* find the end of the hash */ token = strpbrk(line, ", \t"); hashlen = token ? token - line : strlen(line); hex2bin(hash, line, hashlen); siglen = sign_hash(params.hash_algo, hash, hashlen/2, key, NULL, sig + 1); if (siglen <= 1) return siglen; fwrite(line, len, 1, stdout); fprintf(stdout, " "); bin2hex(sig, siglen + 1, stdout); fprintf(stdout, "\n"); } if (!hashlen) { log_err("Parameters missing\n"); print_usage(cmd); return -1; } return 0; } static int sign_evm_path(const char *file) { const char *key; int err; key = params.keyfile ? : "/etc/keys/privkey_evm.pem"; if (digsig) { err = sign_ima(file, key); if (err) return err; } if (digest) { err = hash_ima(file); if (err) return err; } return sign_evm(file, key); } static int cmd_sign_evm(struct command *cmd) { return do_cmd(cmd, sign_evm_path); } static int verify_evm(const char *file) { unsigned char hash[20]; unsigned char sig[1024]; int len; len = calc_evm_hash(file, hash); if (len <= 1) return len; len = lgetxattr(file, "security.evm", sig, sizeof(sig)); if (len < 0) { log_err("getxattr failed: %s\n", file); return len; } if (sig[0] != 0x03) { log_err("security.evm has no signature\n"); return -1; } return verify_hash(file, hash, sizeof(hash), sig + 1, len - 1); } static int cmd_verify_evm(struct command *cmd) { char *file = g_argv[optind++]; int err; if (!file) { log_err("Parameters missing\n"); print_usage(cmd); return -1; } err = verify_evm(file); if (!err && params.verbose >= LOG_INFO) log_info("%s: verification is OK\n", file); return err; } static int verify_ima(const char *file) { unsigned char sig[1024]; int len; if (sigfile) { void *tmp = file2bin(file, "sig", &len); memcpy(sig, tmp, len); free(tmp); } else { len = lgetxattr(file, "security.ima", sig, sizeof(sig)); if (len < 0) { log_err("getxattr failed: %s\n", file); return len; } } return ima_verify_signature(file, sig, len, NULL, 0); } static int cmd_verify_ima(struct command *cmd) { char *file = g_argv[optind++]; int err; errno = 0; if (!file) { log_err("Parameters missing\n"); print_usage(cmd); return -1; } err = verify_ima(file); if (!err && params.verbose >= LOG_INFO) log_info("%s: verification is OK\n", file); return err; } static int cmd_convert(struct command *cmd) { char *inkey; unsigned char _pub[1024], *pub = _pub; int len, err = 0; char name[20]; uint8_t keyid[8]; RSA *key; params.x509 = 0; inkey = g_argv[optind++]; if (!inkey) { inkey = params.x509 ? "/etc/keys/x509_evm.der" : "/etc/keys/pubkey_evm.pem"; } key = read_pub_key(inkey, params.x509); if (!key) return 1; len = key2bin(key, pub); calc_keyid_v1(keyid, name, pub, len); bin2file(inkey, "bin", pub, len); bin2file(inkey, "keyid", (const unsigned char *)name, strlen(name)); RSA_free(key); return err; } static int cmd_import(struct command *cmd) { char *inkey, *ring = NULL; unsigned char _pub[1024], *pub = _pub; int id, len, err = 0; char name[20]; uint8_t keyid[8]; RSA *key; inkey = g_argv[optind++]; if (!inkey) { inkey = params.x509 ? "/etc/keys/x509_evm.der" : "/etc/keys/pubkey_evm.pem"; } else ring = g_argv[optind++]; id = KEY_SPEC_USER_KEYRING; /* default keyring */ if (ring) { if (ring[0] != '@') { int base = 10; if (ring[0] == '0' && ring[1] == 'x') base = 16; id = strtoul(ring, NULL, base); } else { if (strcmp(ring, "@t") == 0) id = -1; else if (strcmp(ring, "@p") == 0) id = -2; else if (strcmp(ring, "@s") == 0) id = -3; else if (strcmp(ring, "@u") == 0) id = -4; else if (strcmp(ring, "@us") == 0) id = -5; else if (strcmp(ring, "@g") == 0) id = -6; } } key = read_pub_key(inkey, params.x509); if (!key) return 1; if (params.x509) { pub = file2bin(inkey, NULL, &len); if (!pub) goto out; calc_keyid_v2((uint32_t *)keyid, name, key); } else { len = key2bin(key, pub); calc_keyid_v1(keyid, name, pub, len); } log_info("Importing public key %s from file %s into keyring %d\n", name, inkey, id); id = add_key(params.x509 ? "asymmetric" : "user", params.x509 ? NULL : name, pub, len, id); if (id < 0) { log_err("add_key failed\n"); err = id; } else { log_info("keyid: %d\n", id); printf("%d\n", id); } if (params.x509) free(pub); out: RSA_free(key); return err; } static int setxattr_ima(const char *file, char *sig_file) { unsigned char *sig; int len, err; if (sig_file) sig = file2bin(sig_file, NULL, &len); else sig = file2bin(file, "sig", &len); if (!sig) return 0; err = lsetxattr(file, "security.ima", sig, len, 0); if (err < 0) log_err("setxattr failed: %s\n", file); free(sig); return err; } static int cmd_setxattr_ima(struct command *cmd) { char *file, *sig = NULL; if (sigfile) sig = g_argv[optind++]; file = g_argv[optind++]; if (!file) { log_err("Parameters missing\n"); print_usage(cmd); return -1; } return setxattr_ima(file, sig); } #define MAX_KEY_SIZE 128 static int calc_evm_hmac(const char *file, const char *keyfile, unsigned char *hash) { struct stat st; int err = -1; uint32_t generation = 0; HMAC_CTX *pctx; unsigned int mdlen; char **xattrname; unsigned char xattr_value[1024]; unsigned char *key; int keylen; unsigned char evmkey[MAX_KEY_SIZE]; char list[1024]; ssize_t list_size; struct h_misc_64 hmac_misc; int hmac_size; #if OPENSSL_VERSION_NUMBER < 0x10100000 HMAC_CTX ctx; pctx = &ctx; #else pctx = HMAC_CTX_new(); #endif key = file2bin(keyfile, NULL, &keylen); if (!key) { log_err("Failed to read a key: %s\n", keyfile); return -1; } if (keylen > sizeof(evmkey)) { log_err("key is too long: %d\n", keylen); goto out; } /* EVM key is 128 bytes */ memcpy(evmkey, key, keylen); memset(evmkey + keylen, 0, sizeof(evmkey) - keylen); if (lstat(file, &st)) { log_err("Failed to stat: %s\n", file); goto out; } if (S_ISREG(st.st_mode) || S_ISDIR(st.st_mode)) { /* we cannot at the momement to get generation of special files.. * kernel API does not support it */ int fd = open(file, 0); if (fd < 0) { log_err("Failed to open %s\n", file); goto out; } if (ioctl(fd, FS_IOC_GETVERSION, &generation)) { log_err("ioctl() failed\n"); close(fd); goto out; } close(fd); } log_info("generation: %u\n", generation); list_size = llistxattr(file, list, sizeof(list)); if (list_size <= 0) { log_err("llistxattr() failed: %s\n", file); goto out; } err = !HMAC_Init_ex(pctx, evmkey, sizeof(evmkey), EVP_sha1(), NULL); if (err) { log_err("HMAC_Init() failed\n"); goto out; } for (xattrname = evm_config_xattrnames; *xattrname != NULL; xattrname++) { err = lgetxattr(file, *xattrname, xattr_value, sizeof(xattr_value)); if (err < 0) { log_info("no xattr: %s\n", *xattrname); continue; } if (!find_xattr(list, list_size, *xattrname)) { log_info("skipping xattr: %s\n", *xattrname); continue; } /*log_debug("name: %s, value: %s, size: %d\n", *xattrname, xattr_value, err);*/ log_info("name: %s, size: %d\n", *xattrname, err); log_debug_dump(xattr_value, err); err = !HMAC_Update(pctx, xattr_value, err); if (err) { log_err("HMAC_Update() failed\n"); goto out_ctx_cleanup; } } memset(&hmac_misc, 0, sizeof(hmac_misc)); if (msize == 0) { struct h_misc *hmac = (struct h_misc *)&hmac_misc; hmac_size = sizeof(*hmac); hmac->ino = st.st_ino; hmac->generation = generation; hmac->uid = st.st_uid; hmac->gid = st.st_gid; hmac->mode = st.st_mode; } else if (msize == 64) { struct h_misc_64 *hmac = (struct h_misc_64 *)&hmac_misc; hmac_size = sizeof(*hmac); hmac->ino = st.st_ino; hmac->generation = generation; hmac->uid = st.st_uid; hmac->gid = st.st_gid; hmac->mode = st.st_mode; } else { struct h_misc_32 *hmac = (struct h_misc_32 *)&hmac_misc; hmac_size = sizeof(*hmac); hmac->ino = st.st_ino; hmac->generation = generation; hmac->uid = st.st_uid; hmac->gid = st.st_gid; hmac->mode = st.st_mode; } log_debug("hmac_misc (%d): ", hmac_size); log_debug_dump(&hmac_misc, hmac_size); err = !HMAC_Update(pctx, (const unsigned char *)&hmac_misc, hmac_size); if (err) { log_err("HMAC_Update() failed\n"); goto out_ctx_cleanup; } err = !HMAC_Final(pctx, hash, &mdlen); if (err) log_err("HMAC_Final() failed\n"); out_ctx_cleanup: #if OPENSSL_VERSION_NUMBER < 0x10100000 HMAC_CTX_cleanup(pctx); #else HMAC_CTX_free(pctx); #endif out: free(key); return err ?: mdlen; } static int hmac_evm(const char *file, const char *key) { unsigned char hash[20]; unsigned char sig[1024]; int len, err; len = calc_evm_hmac(file, key, hash); if (len <= 1) return len; log_info("hmac: "); log_dump(hash, len); memcpy(sig + 1, hash, len); if (xattr) { sig[0] = EVM_XATTR_HMAC; err = lsetxattr(file, "security.evm", sig, len + 1, 0); if (err < 0) { log_err("setxattr failed: %s\n", file); return err; } } return 0; } static int cmd_hmac_evm(struct command *cmd) { const char *key, *file = g_argv[optind++]; int err; if (!file) { log_err("Parameters missing\n"); print_usage(cmd); return -1; } key = params.keyfile ? : "/etc/keys/privkey_evm.pem"; if (digsig) { err = sign_ima(file, key); if (err) return err; } if (digest) { err = hash_ima(file); if (err) return err; } return hmac_evm(file, "/etc/keys/evm-key-plain"); } static int ima_fix(const char *path) { int fd, size, len, ima = 0, evm = 0; char buf[1024], *list = buf; log_info("%s\n", path); if (check_xattr) { /* re-measuring takes a time * in some cases we can skip labeling if xattrs exists */ size = llistxattr(path, list, sizeof(buf)); if (size < 0) { log_errno("Failed to read xattrs (llistxattr): %s\n", path); return -1; } for (; size > 0; len++, size -= len, list += len) { len = strlen(list); if (!strcmp(list, "security.ima")) ima = 1; else if (!strcmp(list, "security.evm")) evm = 1; } if (ima && evm) return 0; } fd = open(path, O_RDONLY); if (fd < 0) { log_errno("Failed to open file: %s", path); return -1; } close(fd); return 0; } static int find(const char *path, int dts, find_cb_t func) { struct dirent *de; DIR *dir; if (fs_dev) { struct stat st; int err = lstat(path, &st); if (err < 0) { log_err("Failed to stat: %s\n", path); return err; } if (st.st_dev != fs_dev) return 0; } dir = opendir(path); if (!dir) { log_err("Failed to open directory %s\n", path); return -1; } if (fchdir(dirfd(dir))) { log_err("Failed to chdir %s\n", path); return -1; } while ((de = readdir(dir))) { if (!strcmp(de->d_name, "..") || !strcmp(de->d_name, ".")) continue; log_debug("path: %s, type: %u\n", de->d_name, de->d_type); if (de->d_type == DT_DIR) find(de->d_name, dts, func); else if (dts & (1 << de->d_type)) func(de->d_name); } if (chdir("..")) { log_err("Failed to chdir: %s\n", path); return -1; } if (dts & DIR_MASK) func(path); closedir(dir); return 0; } static int cmd_ima_fix(struct command *cmd) { return do_cmd(cmd, ima_fix); } static int ima_clear(const char *path) { log_info("%s\n", path); lremovexattr(path, "security.ima"); lremovexattr(path, "security.evm"); return 0; } static int cmd_ima_clear(struct command *cmd) { return do_cmd(cmd, ima_clear); } static char *pcrs = "/sys/class/tpm/tpm0/device/pcrs"; /* Kernels >= 4.0 */ static char *misc_pcrs = "/sys/class/misc/tpm0/device/pcrs"; static int tpm_pcr_read(int idx, uint8_t *pcr, int len) { FILE *fp; char *p, pcr_str[7], buf[70]; /* length of the TPM string */ int result = -1; sprintf(pcr_str, "PCR-%d", idx); fp = fopen(pcrs, "r"); if (!fp) fp = fopen(misc_pcrs, "r"); if (!fp) { log_err("Unable to open %s or %s\n", pcrs, misc_pcrs); return -1; } for (;;) { p = fgets(buf, sizeof(buf), fp); if (!p) break; if (!strncmp(p, pcr_str, 6)) { hex2bin(pcr, p + 7, len); result = 0; break; } } fclose(fp); return result; } #define TCG_EVENT_NAME_LEN_MAX 255 struct template_entry { struct { uint32_t pcr; uint8_t digest[SHA_DIGEST_LENGTH]; uint32_t name_len; } header __packed; char name[TCG_EVENT_NAME_LEN_MAX + 1]; int template_len; uint8_t *template; int template_buf_len; }; static uint8_t zero[SHA_DIGEST_LENGTH]; static uint8_t fox[SHA_DIGEST_LENGTH]; int validate = 1; void ima_extend_pcr(uint8_t *pcr, uint8_t *digest, int length) { SHA_CTX ctx; SHA1_Init(&ctx); SHA1_Update(&ctx, pcr, length); if (validate && !memcmp(digest, zero, length)) SHA1_Update(&ctx, fox, length); else SHA1_Update(&ctx, digest, length); SHA1_Final(pcr, &ctx); } static int ima_verify_template_hash(struct template_entry *entry) { uint8_t digest[SHA_DIGEST_LENGTH]; if (!memcmp(zero, entry->header.digest, sizeof(zero))) return 0; SHA1(entry->template, entry->template_len, digest); if (memcmp(digest, entry->header.digest, sizeof(digest))) { log_err("template hash error\n"); return 1; } return 0; } void ima_show(struct template_entry *entry) { log_debug("ima, digest: "); log_debug_dump(entry->header.digest, sizeof(entry->header.digest)); } void ima_ng_show(struct template_entry *entry) { uint8_t *fieldp = entry->template; uint32_t field_len; int total_len = entry->template_len, digest_len, len, sig_len; uint8_t *digest, *sig = NULL; char *algo, *path; int err; /* get binary digest */ field_len = *(uint32_t *)fieldp; fieldp += sizeof(field_len); total_len -= sizeof(field_len); algo = (char *)fieldp; len = strlen(algo) + 1; digest_len = field_len - len; digest = fieldp + len; /* move to next field */ fieldp += field_len; total_len -= field_len; /* get path */ field_len = *(uint32_t *)fieldp; fieldp += sizeof(field_len); total_len -= sizeof(field_len); path = (char *)fieldp; /* move to next field */ fieldp += field_len; total_len -= field_len; if (!strcmp(entry->name, "ima-sig")) { /* get signature */ field_len = *(uint32_t *)fieldp; fieldp += sizeof(field_len); total_len -= sizeof(field_len); if (field_len) { sig = fieldp; sig_len = field_len; /* move to next field */ fieldp += field_len; total_len -= field_len; } } /* ascii_runtime_measurements */ if (params.verbose > LOG_INFO) { log_info("%d ", entry->header.pcr); log_dump_n(entry->header.digest, sizeof(entry->header.digest)); log_info(" %s %s", entry->name, algo); log_dump_n(digest, digest_len); log_info(" %s", path); } if (sig) { if (params.verbose > LOG_INFO) { log_info(" "); log_dump(sig, sig_len); } if (measurement_list) err = ima_verify_signature(path, sig, sig_len, digest, digest_len); else err = ima_verify_signature(path, sig, sig_len, NULL, 0); if (!err && params.verbose > LOG_INFO) log_info("%s: verification is OK\n", path); } else { if (params.verbose > LOG_INFO) log_info("\n"); } if (total_len) log_err("Remain unprocessed data: %d\n", total_len); } static int ima_measurement(const char *file) { uint8_t pcr[NUM_PCRS][SHA_DIGEST_LENGTH] = {{0}}; uint8_t hwpcr[SHA_DIGEST_LENGTH]; struct template_entry entry = { .template = 0 }; FILE *fp; int err = -1; bool verify_failed = false; int i; errno = 0; memset(zero, 0, SHA_DIGEST_LENGTH); memset(fox, 0xff, SHA_DIGEST_LENGTH); log_debug("Initial PCR value: "); log_debug_dump(pcr, sizeof(pcr)); fp = fopen(file, "rb"); if (!fp) { log_err("Failed to open measurement file: %s\n", file); return -1; } /* Support multiple public keys */ if (params.keyfile) init_public_keys(params.keyfile); while (fread(&entry.header, sizeof(entry.header), 1, fp)) { ima_extend_pcr(pcr[entry.header.pcr], entry.header.digest, SHA_DIGEST_LENGTH); if (!fread(entry.name, entry.header.name_len, 1, fp)) { log_err("Unable to read template name\n"); goto out; } entry.name[entry.header.name_len] = '\0'; if (!fread(&entry.template_len, sizeof(entry.template_len), 1, fp)) { log_err("Unable to read template length\n"); goto out; } if (entry.template_buf_len < entry.template_len) { free(entry.template); entry.template_buf_len = entry.template_len; entry.template = malloc(entry.template_len); } if (!fread(entry.template, entry.template_len, 1, fp)) { log_err("Unable to read template\n"); goto out; } if (validate) ima_verify_template_hash(&entry); if (!strcmp(entry.name, "ima")) ima_show(&entry); else ima_ng_show(&entry); } for (i = 0; i < NUM_PCRS; i++) { if (memcmp(pcr[i], zero, SHA_DIGEST_LENGTH) == 0) continue; log_info("PCRAgg %.2d: ", i); log_dump(pcr[i], SHA_DIGEST_LENGTH); tpm_pcr_read(i, hwpcr, sizeof(hwpcr)); log_info("HW PCR-%d: ", i); log_dump(hwpcr, sizeof(hwpcr)); if (memcmp(pcr[i], hwpcr, sizeof(SHA_DIGEST_LENGTH)) != 0) { log_err("PCRAgg %d does not match HW PCR-%d\n", i, i); verify_failed = true; } } if (!verify_failed) err = 0; out: fclose(fp); return err; } static int cmd_ima_measurement(struct command *cmd) { char *file = g_argv[optind++]; if (!file) { log_err("Parameters missing\n"); print_usage(cmd); return -1; } return ima_measurement(file); } static void print_usage(struct command *cmd) { printf("usage: %s %s\n", cmd->name, cmd->arg ? cmd->arg : ""); } static void print_full_usage(struct command *cmd) { if (cmd->name) printf("usage: %s %s\n", cmd->name, cmd->arg ? cmd->arg : ""); if (cmd->msg) printf("%s", cmd->msg); } static int print_command_usage(struct command *cmds, char *command) { struct command *cmd; for (cmd = cmds; cmd->name; cmd++) { if (strcmp(cmd->name, command) == 0) { print_full_usage(cmd); return 0; } } printf("invalid command: %s\n", command); return -1; } static void print_all_usage(struct command *cmds) { struct command *cmd; printf("commands:\n"); for (cmd = cmds; cmd->name; cmd++) { if (cmd->arg) printf(" %s %s\n", cmd->name, cmd->arg); else if (cmd->msg) printf(" %s", cmd->msg); } } static int call_command(struct command *cmds, char *command) { struct command *cmd; for (cmd = cmds; cmd->name; cmd++) { if (strcasecmp(cmd->name, command) == 0) return cmd->func(cmd); } printf("Invalid command: %s\n", command); return -1; } static int cmd_help(struct command *cmd) { if (!g_argv[optind]) { print_usage(cmd); return 0; } else return print_command_usage(cmds, g_argv[optind]); } static void usage(void) { printf("Usage: evmctl [-v] [OPTIONS]\n"); print_all_usage(cmds); printf( "\n" " -a, --hashalgo sha1 (default), sha224, sha256, sha384, sha512\n" " -s, --imasig make IMA signature\n" " -d, --imahash make IMA hash\n" " -f, --sigfile store IMA signature in .sig file instead of xattr\n" " --rsa use RSA key type and signing scheme v1\n" " -k, --key path to signing key (default: /etc/keys/{privkey,pubkey}_evm.pem)\n" " -o, --portable generate portable EVM signatures\n" " -p, --pass password for encrypted signing key\n" " -r, --recursive recurse into directories (sign)\n" " -t, --type file types to fix 'fdsxm' (f: file, d: directory, s: block/char/symlink)\n" " x - skip fixing if both ima and evm xattrs exist (use with caution)\n" " m - stay on the same filesystem (like 'find -xdev')\n" " -n print result to stdout instead of setting xattr\n" " -u, --uuid use custom FS UUID for EVM (unspecified: from FS, empty: do not use)\n" " --smack use extra SMACK xattrs for EVM\n" " --m32 force EVM hmac/signature for 32 bit target system\n" " --m64 force EVM hmac/signature for 64 bit target system\n" " --ino use custom inode for EVM\n" " --uid use custom UID for EVM\n" " --gid use custom GID for EVM\n" " --mode use custom Mode for EVM\n" " --generation use custom Generation for EVM(unspecified: from FS, empty: use 0)\n" " --ima use custom IMA signature for EVM\n" " --selinux use custom Selinux label for EVM\n" " --caps use custom Capabilities for EVM(unspecified: from FS, empty: do not use)\n" " --list measurement list verification\n" " -v increase verbosity level\n" " -h, --help display this help and exit\n" "\n"); } struct command cmds[] = { {"--version", NULL, 0, ""}, {"help", cmd_help, 0, ""}, {"import", cmd_import, 0, "[--rsa] pubkey keyring", "Import public key into the keyring.\n"}, {"convert", cmd_convert, 0, "key", "convert public key into the keyring.\n"}, {"sign", cmd_sign_evm, 0, "[-r] [--imahash | --imasig ] [--key key] [--pass [password] file", "Sign file metadata.\n"}, {"verify", cmd_verify_evm, 0, "file", "Verify EVM signature (for debugging).\n"}, {"ima_sign", cmd_sign_ima, 0, "[--sigfile] [--key key] [--pass [password] file", "Make file content signature.\n"}, {"ima_verify", cmd_verify_ima, 0, "file", "Verify IMA signature (for debugging).\n"}, {"ima_setxattr", cmd_setxattr_ima, 0, "[--sigfile file]", "Set IMA signature from sigfile\n"}, {"ima_hash", cmd_hash_ima, 0, "file", "Make file content hash.\n"}, {"ima_measurement", cmd_ima_measurement, 0, "file", "Verify measurement list (experimental).\n"}, {"ima_fix", cmd_ima_fix, 0, "[-t fdsxm] path", "Recursively fix IMA/EVM xattrs in fix mode.\n"}, {"ima_clear", cmd_ima_clear, 0, "[-t fdsxm] path", "Recursively remove IMA/EVM xattrs.\n"}, {"sign_hash", cmd_sign_hash, 0, "[--key key] [--pass [password]", "Sign hashes from shaXsum output.\n"}, #ifdef DEBUG {"hmac", cmd_hmac_evm, 0, "[--imahash | --imasig ] file", "Sign file metadata with HMAC using symmetric key (for testing purpose).\n"}, #endif {0, 0, 0, NULL} }; static struct option opts[] = { {"help", 0, 0, 'h'}, {"imasig", 0, 0, 's'}, {"imahash", 0, 0, 'd'}, {"hashalgo", 1, 0, 'a'}, {"pass", 2, 0, 'p'}, {"sigfile", 0, 0, 'f'}, {"uuid", 2, 0, 'u'}, {"rsa", 0, 0, '1'}, {"key", 1, 0, 'k'}, {"type", 1, 0, 't'}, {"recursive", 0, 0, 'r'}, {"m32", 0, 0, '3'}, {"m64", 0, 0, '6'}, {"portable", 0, 0, 'o'}, {"smack", 0, 0, 128}, {"version", 0, 0, 129}, {"inode", 1, 0, 130}, {"uid", 1, 0, 131}, {"gid", 1, 0, 132}, {"mode", 1, 0, 133}, {"generation", 1, 0, 134}, {"ima", 1, 0, 135}, {"selinux", 1, 0, 136}, {"caps", 2, 0, 137}, {"list", 0, 0, 138}, {} }; static char *get_password(void) { struct termios flags, tmp_flags; char *password, *pwd; int passlen = 64; password = malloc(passlen); if (!password) { perror("malloc"); return NULL; } tcgetattr(fileno(stdin), &flags); tmp_flags = flags; tmp_flags.c_lflag &= ~ECHO; tmp_flags.c_lflag |= ECHONL; if (tcsetattr(fileno(stdin), TCSANOW, &tmp_flags) != 0) { perror("tcsetattr"); return NULL; } printf("PEM password: "); pwd = fgets(password, passlen, stdin); /* restore terminal */ if (tcsetattr(fileno(stdin), TCSANOW, &flags) != 0) { perror("tcsetattr"); return NULL; } return pwd; } int main(int argc, char *argv[]) { int err = 0, c, lind; g_argv = argv; g_argc = argc; while (1) { c = getopt_long(argc, argv, "hvnsda:op::fu::k:t:ri", opts, &lind); if (c == -1) break; switch (c) { case 'h': usage(); exit(0); break; case 'v': params.verbose++; break; case 'd': digest = 1; break; case 's': digsig = 1; break; case 'n': /* do not set Extended Attributes... just print signature */ xattr = 0; sigdump = 1; break; case 'a': params.hash_algo = optarg; break; case 'p': if (optarg) params.keypass = optarg; else params.keypass = get_password(); break; case 'f': sigfile = 1; break; case 'u': uuid_str = optarg; if (!uuid_str) hmac_flags |= HMAC_FLAG_NO_UUID; break; case '1': params.x509 = 0; break; case 'k': params.keyfile = optarg; break; case 'i': if (evm_portable) log_err("Portable and immutable options are exclusive, ignoring immutable option."); else evm_immutable = true; break; case 'o': if (evm_immutable) log_err("Portable and immutable options are exclusive, ignoring portable option."); else evm_portable = true; break; case 't': search_type = optarg; break; case 'r': recursive = 1; break; case '3': msize = 32; break; case '6': msize = 64; break; case 128: evm_config_xattrnames = evm_extra_smack_xattrs; break; case 129: printf("evmctl %s\n", VERSION); exit(0); break; case 130: ino_str = optarg; break; case 131: uid_str = optarg; break; case 132: gid_str = optarg; break; case 133: mode_str = optarg; break; case 134: generation_str = optarg; break; case 135: ima_str = optarg; break; case 136: selinux_str = optarg; break; case 137: caps_str = optarg; hmac_flags |= HMAC_FLAG_CAPS_SET; break; case 138: measurement_list = 1; break; case '?': exit(1); break; default: log_err("getopt() returned: %d (%c)\n", c, c); } } if (argv[optind] == NULL) usage(); else err = call_command(cmds, argv[optind++]); if (err) { unsigned long error; if (errno) log_err("errno: %s (%d)\n", strerror(errno), errno); for (;;) { error = ERR_get_error(); if (!error) break; log_err("%s\n", ERR_error_string(error, NULL)); } } ERR_free_strings(); EVP_cleanup(); BIO_free(NULL); return err; } ima-evm-utils-1.1/src/imaevm.h000066400000000000000000000136741324130233300162670ustar00rootroot00000000000000/* * ima-evm-utils - IMA/EVM support utilities * * Copyright (C) 2011 Nokia Corporation * Copyright (C) 2011,2012,2013 Intel Corporation * Copyright (C) 2013,2014 Samsung Electronics * * Authors: * Dmitry Kasatkin * * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * 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, see . * * As a special exception, the copyright holders give permission to link the * code of portions of this program with the OpenSSL library under certain * conditions as described in each individual source file and distribute * linked combinations including the program with the OpenSSL library. You * must comply with the GNU General Public License in all respects * for all of the code used other than as permitted herein. If you modify * file(s) with this exception, you may extend this exception to your * version of the file(s), but you are not obligated to do so. If you do not * wish to do so, delete this exception statement from your version. If you * delete this exception statement from all source files in the program, * then also delete it in the license file. * * File: imaevm.h * IMA/EVM header file */ #ifndef _LIBIMAEVM_H #define _LIBIMAEVM_H #include #include #include #include #include #include #ifdef USE_FPRINTF #define do_log(level, fmt, args...) ({ if (level <= params.verbose) fprintf(stderr, fmt, ##args); }) #define do_log_dump(level, p, len, cr) ({ if (level <= params.verbose) do_dump(stderr, p, len, cr); }) #else #define do_log(level, fmt, args...) syslog(level, fmt, ##args) #define do_log_dump(level, p, len, cr) #endif #ifdef DEBUG #define log_debug(fmt, args...) do_log(LOG_DEBUG, "%s:%d " fmt, __func__ , __LINE__ , ##args) #define log_debug_dump(p, len) do_log_dump(LOG_DEBUG, p, len, true) #define log_debug_dump_n(p, len) do_log_dump(LOG_DEBUG, p, len, false) #else #define log_debug(fmt, args...) #define log_debug_dump(p, len) #endif #define log_dump(p, len) do_log_dump(LOG_INFO, p, len, true) #define log_dump_n(p, len) do_log_dump(LOG_INFO, p, len, false) #define log_info(fmt, args...) do_log(LOG_INFO, fmt, ##args) #define log_err(fmt, args...) do_log(LOG_ERR, fmt, ##args) #define log_errno(fmt, args...) do_log(LOG_ERR, fmt ": errno: %s (%d)\n", ##args, strerror(errno), errno) #define DATA_SIZE 4096 #define SHA1_HASH_LEN 20 #define __packed __attribute__((packed)) enum evm_ima_xattr_type { IMA_XATTR_DIGEST = 0x01, EVM_XATTR_HMAC, EVM_IMA_XATTR_DIGSIG, IMA_XATTR_DIGEST_NG, EVM_XATTR_PORTABLE_DIGSIG, }; struct h_misc { unsigned long ino; uint32_t generation; uid_t uid; gid_t gid; unsigned short mode; }; struct h_misc_32 { uint32_t ino; uint32_t generation; uid_t uid; gid_t gid; unsigned short mode; }; struct h_misc_64 { uint64_t ino; uint32_t generation; uid_t uid; gid_t gid; unsigned short mode; }; struct h_misc_digsig { uid_t uid; gid_t gid; unsigned short mode; }; enum pubkey_algo { PUBKEY_ALGO_RSA, PUBKEY_ALGO_MAX, }; enum digest_algo { DIGEST_ALGO_SHA1, DIGEST_ALGO_SHA256, DIGEST_ALGO_MAX }; enum digsig_version { DIGSIG_VERSION_1 = 1, DIGSIG_VERSION_2 }; struct pubkey_hdr { uint8_t version; /* key format version */ uint32_t timestamp; /* key made, always 0 for now */ uint8_t algo; uint8_t nmpi; char mpi[0]; } __packed; struct signature_hdr { uint8_t version; /* signature format version */ uint32_t timestamp; /* signature made */ uint8_t algo; uint8_t hash; uint8_t keyid[8]; uint8_t nmpi; char mpi[0]; } __packed; enum pkey_hash_algo { PKEY_HASH_MD4, PKEY_HASH_MD5, PKEY_HASH_SHA1, PKEY_HASH_RIPE_MD_160, PKEY_HASH_SHA256, PKEY_HASH_SHA384, PKEY_HASH_SHA512, PKEY_HASH_SHA224, PKEY_HASH__LAST }; /* * signature format v2 - for using with asymmetric keys */ struct signature_v2_hdr { uint8_t version; /* signature format version */ uint8_t hash_algo; /* Digest algorithm [enum pkey_hash_algo] */ uint32_t keyid; /* IMA key identifier - not X509/PGP specific*/ uint16_t sig_size; /* signature size */ uint8_t sig[0]; /* signature payload */ } __packed; typedef int (*verify_hash_fn_t)(const char *file, const unsigned char *hash, int size, unsigned char *sig, int siglen, const char *keyfile); struct libevm_params { int verbose; int x509; const char *hash_algo; const char *keyfile; const char *keypass; }; struct RSA_ASN1_template { const uint8_t *data; size_t size; }; #define NUM_PCRS 20 #define DEFAULT_PCR 10 extern const struct RSA_ASN1_template RSA_ASN1_templates[PKEY_HASH__LAST]; extern struct libevm_params params; void do_dump(FILE *fp, const void *ptr, int len, bool cr); void dump(const void *ptr, int len); int get_filesize(const char *filename); int ima_calc_hash(const char *file, uint8_t *hash); int get_hash_algo(const char *algo); RSA *read_pub_key(const char *keyfile, int x509); void calc_keyid_v1(uint8_t *keyid, char *str, const unsigned char *pkey, int len); void calc_keyid_v2(uint32_t *keyid, char *str, RSA *key); int key2bin(RSA *key, unsigned char *pub); int sign_hash(const char *algo, const unsigned char *hash, int size, const char *keyfile, const char *keypass, unsigned char *sig); int verify_hash(const char *file, const unsigned char *hash, int size, unsigned char *sig, int siglen); int ima_verify_signature(const char *file, unsigned char *sig, int siglen, unsigned char *digest, int digestlen); void init_public_keys(const char *keyfiles); #endif ima-evm-utils-1.1/src/libimaevm.c000066400000000000000000000472621324130233300167510ustar00rootroot00000000000000/* * ima-evm-utils - IMA/EVM support utilities * * Copyright (C) 2011 Nokia Corporation * Copyright (C) 2011,2012,2013 Intel Corporation * Copyright (C) 2013,2014 Samsung Electronics * * Authors: * Dmitry Kasatkin * * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * 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, see . * * As a special exception, the copyright holders give permission to link the * code of portions of this program with the OpenSSL library under certain * conditions as described in each individual source file and distribute * linked combinations including the program with the OpenSSL library. You * must comply with the GNU General Public License in all respects * for all of the code used other than as permitted herein. If you modify * file(s) with this exception, you may extend this exception to your * version of the file(s), but you are not obligated to do so. If you do not * wish to do so, delete this exception statement from your version. If you * delete this exception statement from all source files in the program, * then also delete it in the license file. * * File: libimaevm.c * IMA/EVM library */ /* should we use logger instead for library? */ #define USE_FPRINTF #include #include #include #include #include #include #include #include #include #include #include #include #include "imaevm.h" const char *const pkey_hash_algo[PKEY_HASH__LAST] = { [PKEY_HASH_MD4] = "md4", [PKEY_HASH_MD5] = "md5", [PKEY_HASH_SHA1] = "sha1", [PKEY_HASH_RIPE_MD_160] = "rmd160", [PKEY_HASH_SHA256] = "sha256", [PKEY_HASH_SHA384] = "sha384", [PKEY_HASH_SHA512] = "sha512", [PKEY_HASH_SHA224] = "sha224", }; /* * Hash algorithm OIDs plus ASN.1 DER wrappings [RFC4880 sec 5.2.2]. */ static const uint8_t RSA_digest_info_MD5[] = { 0x30, 0x20, 0x30, 0x0C, 0x06, 0x08, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x02, 0x05, /* OID */ 0x05, 0x00, 0x04, 0x10 }; static const uint8_t RSA_digest_info_SHA1[] = { 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A, 0x05, 0x00, 0x04, 0x14 }; static const uint8_t RSA_digest_info_RIPE_MD_160[] = { 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x24, 0x03, 0x02, 0x01, 0x05, 0x00, 0x04, 0x14 }; static const uint8_t RSA_digest_info_SHA224[] = { 0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 0x05, 0x00, 0x04, 0x1C }; static const uint8_t RSA_digest_info_SHA256[] = { 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20 }; static const uint8_t RSA_digest_info_SHA384[] = { 0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30 }; static const uint8_t RSA_digest_info_SHA512[] = { 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40 }; const struct RSA_ASN1_template RSA_ASN1_templates[PKEY_HASH__LAST] = { #define _(X) { RSA_digest_info_##X, sizeof(RSA_digest_info_##X) } [PKEY_HASH_MD5] = _(MD5), [PKEY_HASH_SHA1] = _(SHA1), [PKEY_HASH_RIPE_MD_160] = _(RIPE_MD_160), [PKEY_HASH_SHA256] = _(SHA256), [PKEY_HASH_SHA384] = _(SHA384), [PKEY_HASH_SHA512] = _(SHA512), [PKEY_HASH_SHA224] = _(SHA224), #undef _ }; struct libevm_params params = { .verbose = LOG_INFO - 1, .x509 = 1, .hash_algo = "sha1", }; static void __attribute__ ((constructor)) libinit(void); void do_dump(FILE *fp, const void *ptr, int len, bool cr) { int i; uint8_t *data = (uint8_t *) ptr; for (i = 0; i < len; i++) fprintf(fp, "%02x", data[i]); if (cr) fprintf(fp, "\n"); } void dump(const void *ptr, int len) { do_dump(stdout, ptr, len, true); } int get_filesize(const char *filename) { struct stat stats; /* Need to know the file length */ stat(filename, &stats); return (int)stats.st_size; } static inline off_t get_fdsize(int fd) { struct stat stats; /* Need to know the file length */ fstat(fd, &stats); return stats.st_size; } static int add_file_hash(const char *file, EVP_MD_CTX *ctx) { uint8_t *data; int err = -1, bs = DATA_SIZE; off_t size, len; FILE *fp; fp = fopen(file, "r"); if (!fp) { log_err("Failed to open: %s\n", file); return -1; } data = malloc(bs); if (!data) { log_err("malloc failed\n"); goto out; } for (size = get_fdsize(fileno(fp)); size; size -= len) { len = MIN(size, bs); if (!fread(data, len, 1, fp)) { if (ferror(fp)) { log_err("fread() failed\n\n"); goto out; } break; } if (!EVP_DigestUpdate(ctx, data, len)) { log_err("EVP_DigestUpdate() failed\n"); err = 1; goto out; } } err = 0; out: fclose(fp); free(data); return err; } static int add_dir_hash(const char *file, EVP_MD_CTX *ctx) { int err; struct dirent *de; DIR *dir; unsigned long long ino, off; unsigned int type; int result = 0; dir = opendir(file); if (!dir) { log_err("Failed to open: %s\n", file); return -1; } while ((de = readdir(dir))) { ino = de->d_ino; off = de->d_off; type = de->d_type; log_debug("entry: %s, ino: %llu, type: %u, off: %llu, reclen: %hu\n", de->d_name, ino, type, off, de->d_reclen); err = EVP_DigestUpdate(ctx, de->d_name, strlen(de->d_name)); /*err |= EVP_DigestUpdate(ctx, &off, sizeof(off));*/ err |= EVP_DigestUpdate(ctx, &ino, sizeof(ino)); err |= EVP_DigestUpdate(ctx, &type, sizeof(type)); if (!err) { log_err("EVP_DigestUpdate() failed\n"); result = 1; break; } } closedir(dir); return result; } static int add_link_hash(const char *path, EVP_MD_CTX *ctx) { int err; char buf[1024]; err = readlink(path, buf, sizeof(buf)); if (err <= 0) return -1; log_info("link: %s -> %.*s\n", path, err, buf); return !EVP_DigestUpdate(ctx, buf, err); } static int add_dev_hash(struct stat *st, EVP_MD_CTX *ctx) { uint32_t dev = st->st_rdev; unsigned major = (dev & 0xfff00) >> 8; unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); log_info("device: %u:%u\n", major, minor); return !EVP_DigestUpdate(ctx, &dev, sizeof(dev)); } int ima_calc_hash(const char *file, uint8_t *hash) { const EVP_MD *md; struct stat st; EVP_MD_CTX *pctx; unsigned int mdlen; int err; #if OPENSSL_VERSION_NUMBER < 0x10100000 EVP_MD_CTX ctx; pctx = &ctx; #else pctx = EVP_MD_CTX_new(); #endif /* Need to know the file length */ err = lstat(file, &st); if (err < 0) { log_err("Failed to stat: %s\n", file); return err; } md = EVP_get_digestbyname(params.hash_algo); if (!md) { log_err("EVP_get_digestbyname() failed\n"); return 1; } err = EVP_DigestInit(pctx, md); if (!err) { log_err("EVP_DigestInit() failed\n"); return 1; } switch (st.st_mode & S_IFMT) { case S_IFREG: err = add_file_hash(file, pctx); break; case S_IFDIR: err = add_dir_hash(file, pctx); break; case S_IFLNK: err = add_link_hash(file, pctx); break; case S_IFIFO: case S_IFSOCK: case S_IFCHR: case S_IFBLK: err = add_dev_hash(&st, pctx); break; default: log_errno("Unsupported file type"); return -1; } if (err) return err; err = EVP_DigestFinal(pctx, hash, &mdlen); if (!err) { log_err("EVP_DigestFinal() failed\n"); return 1; } return mdlen; } RSA *read_pub_key(const char *keyfile, int x509) { FILE *fp; RSA *key = NULL; X509 *crt = NULL; EVP_PKEY *pkey = NULL; fp = fopen(keyfile, "r"); if (!fp) { log_err("Failed to open keyfile: %s\n", keyfile); return NULL; } if (x509) { crt = d2i_X509_fp(fp, NULL); if (!crt) { log_err("d2i_X509_fp() failed\n"); goto out; } pkey = X509_extract_key(crt); if (!pkey) { log_err("X509_extract_key() failed\n"); goto out; } key = EVP_PKEY_get1_RSA(pkey); } else { key = PEM_read_RSA_PUBKEY(fp, NULL, NULL, NULL); } if (!key) log_err("PEM_read_RSA_PUBKEY() failed\n"); out: if (pkey) EVP_PKEY_free(pkey); if (crt) X509_free(crt); fclose(fp); return key; } int verify_hash_v1(const char *file, const unsigned char *hash, int size, unsigned char *sig, int siglen, const char *keyfile) { int err, len; SHA_CTX ctx; unsigned char out[1024]; RSA *key; unsigned char sighash[20]; struct signature_hdr *hdr = (struct signature_hdr *)sig; log_info("hash-v1: "); log_dump(hash, size); key = read_pub_key(keyfile, 0); if (!key) return 1; SHA1_Init(&ctx); SHA1_Update(&ctx, hash, size); SHA1_Update(&ctx, hdr, sizeof(*hdr)); SHA1_Final(sighash, &ctx); log_info("sighash: "); log_dump(sighash, sizeof(sighash)); err = RSA_public_decrypt(siglen - sizeof(*hdr) - 2, sig + sizeof(*hdr) + 2, out, key, RSA_PKCS1_PADDING); RSA_free(key); if (err < 0) { log_err("%s: RSA_public_decrypt() failed: %d\n", file, err); return 1; } len = err; if (len != sizeof(sighash) || memcmp(out, sighash, len) != 0) { log_err("%s: verification failed: %d\n", file, err); return -1; } return 0; } struct public_key_entry { struct public_key_entry *next; uint32_t keyid; char name[9]; RSA *key; }; static struct public_key_entry *public_keys = NULL; static RSA *find_keyid(uint32_t keyid) { struct public_key_entry *entry; for (entry = public_keys; entry != NULL; entry = entry->next) { if (entry->keyid == keyid) return entry->key; } return NULL; } void init_public_keys(const char *keyfiles) { struct public_key_entry *entry; char *tmp_keyfiles; char *keyfile; int i = 1; tmp_keyfiles = strdup(keyfiles); while ((keyfile = strsep(&tmp_keyfiles, ", \t")) != NULL) { if (!keyfile) break; if ((*keyfile == '\0') || (*keyfile == ' ') || (*keyfile == '\t')) continue; entry = malloc(sizeof(struct public_key_entry)); if (!entry) { perror("malloc"); break; } entry->key = read_pub_key(keyfile, 1); if (!entry->key) { free(entry); continue; } calc_keyid_v2(&entry->keyid, entry->name, entry->key); sprintf(entry->name, "%x", __be32_to_cpup(&entry->keyid)); log_info("key %d: %s %s\n", i++, entry->name, keyfile); entry->next = public_keys; public_keys = entry; } } int verify_hash_v2(const char *file, const unsigned char *hash, int size, unsigned char *sig, int siglen, const char *keyfile) { int err, len; unsigned char out[1024]; RSA *key; struct signature_v2_hdr *hdr = (struct signature_v2_hdr *)sig; const struct RSA_ASN1_template *asn1; if (params.verbose > LOG_INFO) { log_info("hash: "); log_dump(hash, size); } if (public_keys) { key = find_keyid(hdr->keyid); if (!key) { log_err("%s: unknown keyid: %x\n", file, __be32_to_cpup(&hdr->keyid)); return -1; } } else { key = read_pub_key(keyfile, 1); if (!key) return 1; } err = RSA_public_decrypt(siglen - sizeof(*hdr), sig + sizeof(*hdr), out, key, RSA_PKCS1_PADDING); if (err < 0) { log_err("%s: RSA_public_decrypt() failed: %d\n", file, err); return 1; } len = err; asn1 = &RSA_ASN1_templates[hdr->hash_algo]; if (len < asn1->size || memcmp(out, asn1->data, asn1->size)) { log_err("%s: verification failed: %d\n", file, err); return -1; } len -= asn1->size; if (len != size || memcmp(out + asn1->size, hash, len)) { log_err("%s: verification failed: %d\n", file, err); return -1; } return 0; } int get_hash_algo(const char *algo) { int i; for (i = 0; i < PKEY_HASH__LAST; i++) if (!strcmp(algo, pkey_hash_algo[i])) return i; return PKEY_HASH_SHA1; } static int get_hash_algo_from_sig(unsigned char *sig) { uint8_t hashalgo; if (sig[0] == 1) { hashalgo = ((struct signature_hdr *)sig)->hash; if (hashalgo >= DIGEST_ALGO_MAX) return -1; switch (hashalgo) { case DIGEST_ALGO_SHA1: return PKEY_HASH_SHA1; case DIGEST_ALGO_SHA256: return PKEY_HASH_SHA256; default: return -1; } } else if (sig[0] == 2) { hashalgo = ((struct signature_v2_hdr *)sig)->hash_algo; if (hashalgo >= PKEY_HASH__LAST) return -1; return hashalgo; } else return -1; } int verify_hash(const char *file, const unsigned char *hash, int size, unsigned char *sig, int siglen) { const char *key; int x509; verify_hash_fn_t verify_hash; /* Get signature type from sig header */ if (sig[0] == DIGSIG_VERSION_1) { verify_hash = verify_hash_v1; /* Read pubkey from RSA key */ x509 = 0; } else if (sig[0] == DIGSIG_VERSION_2) { verify_hash = verify_hash_v2; /* Read pubkey from x509 cert */ x509 = 1; } else return -1; /* Determine what key to use for verification*/ key = params.keyfile ? : x509 ? "/etc/keys/x509_evm.der" : "/etc/keys/pubkey_evm.pem"; return verify_hash(file, hash, size, sig, siglen, key); } int ima_verify_signature(const char *file, unsigned char *sig, int siglen, unsigned char *digest, int digestlen) { unsigned char hash[64]; int hashlen, sig_hash_algo; if (sig[0] != 0x03) { log_err("security.ima has no signature\n"); return -1; } sig_hash_algo = get_hash_algo_from_sig(sig + 1); if (sig_hash_algo < 0) { log_err("Invalid signature\n"); return -1; } /* Use hash algorithm as retrieved from signature */ params.hash_algo = pkey_hash_algo[sig_hash_algo]; /* * Validate the signature based on the digest included in the * measurement list, not by calculating the local file digest. */ if (digestlen > 0) return verify_hash(file, digest, digestlen, sig + 1, siglen - 1); hashlen = ima_calc_hash(file, hash); if (hashlen <= 1) return hashlen; return verify_hash(file, hash, hashlen, sig + 1, siglen - 1); } /* * Create binary key representation suitable for kernel */ int key2bin(RSA *key, unsigned char *pub) { int len, b, offset = 0; struct pubkey_hdr *pkh = (struct pubkey_hdr *)pub; const BIGNUM *n, *e; #if OPENSSL_VERSION_NUMBER < 0x10100000 n = key->n; e = key->e; #else RSA_get0_key(key, &n, &e, NULL); #endif /* add key header */ pkh->version = 1; pkh->timestamp = 0; /* PEM has no timestamp?? */ pkh->algo = PUBKEY_ALGO_RSA; pkh->nmpi = 2; offset += sizeof(*pkh); len = BN_num_bytes(n); b = BN_num_bits(n); pub[offset++] = b >> 8; pub[offset++] = b & 0xff; BN_bn2bin(n, &pub[offset]); offset += len; len = BN_num_bytes(e); b = BN_num_bits(e); pub[offset++] = b >> 8; pub[offset++] = b & 0xff; BN_bn2bin(e, &pub[offset]); offset += len; return offset; } void calc_keyid_v1(uint8_t *keyid, char *str, const unsigned char *pkey, int len) { uint8_t sha1[SHA_DIGEST_LENGTH]; uint64_t id; SHA1(pkey, len, sha1); /* sha1[12 - 19] is exactly keyid from gpg file */ memcpy(keyid, sha1 + 12, 8); log_debug("keyid: "); log_debug_dump(keyid, 8); if (params.verbose > LOG_INFO) { id = __be64_to_cpup((__be64 *) keyid); sprintf(str, "%llX", (unsigned long long)id); log_info("keyid-v1: %s\n", str); } } void calc_keyid_v2(uint32_t *keyid, char *str, RSA *key) { uint8_t sha1[SHA_DIGEST_LENGTH]; unsigned char *pkey = NULL; int len; len = i2d_RSAPublicKey(key, &pkey); SHA1(pkey, len, sha1); /* sha1[12 - 19] is exactly keyid from gpg file */ memcpy(keyid, sha1 + 16, 4); log_debug("keyid: "); log_debug_dump(keyid, 4); if (params.verbose > LOG_INFO) { sprintf(str, "%x", __be32_to_cpup(keyid)); log_info("keyid: %s\n", str); } free(pkey); } static RSA *read_priv_key(const char *keyfile, const char *keypass) { FILE *fp; RSA *key; fp = fopen(keyfile, "r"); if (!fp) { log_err("Failed to open keyfile: %s\n", keyfile); return NULL; } ERR_load_crypto_strings(); key = PEM_read_RSAPrivateKey(fp, NULL, NULL, (void *)keypass); if (!key) { char str[256]; ERR_error_string(ERR_get_error(), str); log_err("PEM_read_RSAPrivateKey() failed: %s\n", str); } fclose(fp); return key; } static int get_hash_algo_v1(const char *algo) { if (!strcmp(algo, "sha1")) return DIGEST_ALGO_SHA1; else if (!strcmp(algo, "sha256")) return DIGEST_ALGO_SHA256; return -1; } int sign_hash_v1(const char *hashalgo, const unsigned char *hash, int size, const char *keyfile, unsigned char *sig) { int len = -1, hashalgo_idx; SHA_CTX ctx; unsigned char pub[1024]; RSA *key; char name[20]; unsigned char sighash[20]; struct signature_hdr *hdr; uint16_t *blen; if (!hash) { log_err("sign_hash_v1: hash is null\n"); return -1; } if (size < 0) { log_err("sign_hash_v1: size is negative: %d\n", size); return -1; } if (!hashalgo) { log_err("sign_hash_v1: hashalgo is null\n"); return -1; } if (!sig) { log_err("sign_hash_v1: sig is null\n"); return -1; } log_info("hash: "); log_dump(hash, size); key = read_priv_key(keyfile, params.keypass); if (!key) return -1; hdr = (struct signature_hdr *)sig; /* now create a new hash */ hdr->version = (uint8_t) DIGSIG_VERSION_1; hdr->timestamp = time(NULL); hdr->algo = PUBKEY_ALGO_RSA; hashalgo_idx = get_hash_algo_v1(hashalgo); if (hashalgo_idx < 0) { log_err("Signature version 1 does not support hash algo %s\n", hashalgo); goto out; } hdr->hash = (uint8_t) hashalgo_idx; len = key2bin(key, pub); calc_keyid_v1(hdr->keyid, name, pub, len); hdr->nmpi = 1; SHA1_Init(&ctx); SHA1_Update(&ctx, hash, size); SHA1_Update(&ctx, hdr, sizeof(*hdr)); SHA1_Final(sighash, &ctx); log_info("sighash: "); log_dump(sighash, sizeof(sighash)); len = RSA_private_encrypt(sizeof(sighash), sighash, sig + sizeof(*hdr) + 2, key, RSA_PKCS1_PADDING); if (len < 0) { log_err("RSA_private_encrypt() failed: %d\n", len); goto out; } /* we add bit length of the signature to make it gnupg compatible */ blen = (uint16_t *) (sig + sizeof(*hdr)); *blen = __cpu_to_be16(len << 3); len += sizeof(*hdr) + 2; log_info("evm/ima signature-v1: %d bytes\n", len); out: RSA_free(key); return len; } int sign_hash_v2(const char *algo, const unsigned char *hash, int size, const char *keyfile, unsigned char *sig) { struct signature_v2_hdr *hdr; int len = -1; RSA *key; char name[20]; unsigned char *buf; const struct RSA_ASN1_template *asn1; if (!hash) { log_err("sign_hash_v2: hash is null\n"); return -1; } if (size < 0) { log_err("sign_hash_v2: size is negative: %d\n", size); return -1; } if (!sig) { log_err("sign_hash_v2: sig is null\n"); return -1; } if (!algo) { log_err("sign_hash_v2: algo is null\n"); return -1; } log_info("hash: "); log_dump(hash, size); key = read_priv_key(keyfile, params.keypass); if (!key) return -1; hdr = (struct signature_v2_hdr *)sig; hdr->version = (uint8_t) DIGSIG_VERSION_2; hdr->hash_algo = get_hash_algo(algo); calc_keyid_v2(&hdr->keyid, name, key); asn1 = &RSA_ASN1_templates[hdr->hash_algo]; buf = malloc(size + asn1->size); if (!buf) goto out; memcpy(buf, asn1->data, asn1->size); memcpy(buf + asn1->size, hash, size); len = RSA_private_encrypt(size + asn1->size, buf, hdr->sig, key, RSA_PKCS1_PADDING); if (len < 0) { log_err("RSA_private_encrypt() failed: %d\n", len); goto out; } /* we add bit length of the signature to make it gnupg compatible */ hdr->sig_size = __cpu_to_be16(len); len += sizeof(*hdr); log_info("evm/ima signature: %d bytes\n", len); out: if (buf) free(buf); RSA_free(key); return len; } int sign_hash(const char *hashalgo, const unsigned char *hash, int size, const char *keyfile, const char *keypass, unsigned char *sig) { if (keypass) params.keypass = keypass; return params.x509 ? sign_hash_v2(hashalgo, hash, size, keyfile, sig) : sign_hash_v1(hashalgo, hash, size, keyfile, sig); } static void libinit() { OpenSSL_add_all_algorithms(); ERR_load_crypto_strings(); }