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kbuild: sign the modules at install time
Linus deleted the old code and put signing on the install command, I fixed it to extract the keyid and signer-name within sign-file and cleaned up that script now it always signs in-place. Some enthusiast should convert sign-key to perl and pull x509keyid into it. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rusty Russell
Linus Torvalds
parent
c9623de4fc
commit
e2a666d52b
11
Makefile
11
Makefile
@ -719,6 +719,17 @@ endif # INSTALL_MOD_STRIP
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export mod_strip_cmd
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ifeq ($(CONFIG_MODULE_SIG),y)
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MODSECKEY = ./signing_key.priv
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MODPUBKEY = ./signing_key.x509
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export MODPUBKEY
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mod_sign_cmd = sh $(srctree)/scripts/sign-file $(MODSECKEY) $(MODPUBKEY) $(srctree)/scripts/x509keyid
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else
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mod_sign_cmd = true
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endif
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export mod_sign_cmd
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ifeq ($(KBUILD_EXTMOD),)
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core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
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@ -17,7 +17,7 @@ __modinst: $(modules)
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@:
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quiet_cmd_modules_install = INSTALL $@
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cmd_modules_install = mkdir -p $(2); cp $@ $(2) ; $(mod_strip_cmd) $(2)/$(notdir $@)
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cmd_modules_install = mkdir -p $(2); cp $@ $(2) ; $(mod_strip_cmd) $(2)/$(notdir $@) ; $(mod_sign_cmd) $(2)/$(notdir $@)
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# Modules built outside the kernel source tree go into extra by default
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INSTALL_MOD_DIR ?= extra
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@ -14,8 +14,7 @@
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# 3) create one <module>.mod.c file pr. module
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# 4) create one Module.symvers file with CRC for all exported symbols
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# 5) compile all <module>.mod.c files
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# 6) final link of the module to a <module.ko> (or <module.unsigned>) file
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# 7) signs the modules to a <module.ko> file
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# 6) final link of the module to a <module.ko> file
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# Step 3 is used to place certain information in the module's ELF
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# section, including information such as:
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@ -33,8 +32,6 @@
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# Step 4 is solely used to allow module versioning in external modules,
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# where the CRC of each module is retrieved from the Module.symvers file.
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# Step 7 is dependent on CONFIG_MODULE_SIG being enabled.
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# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined
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# symbols in the final module linking stage
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# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
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@ -119,7 +116,6 @@ $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE
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targets += $(modules:.ko=.mod.o)
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# Step 6), final link of the modules
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ifneq ($(CONFIG_MODULE_SIG),y)
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quiet_cmd_ld_ko_o = LD [M] $@
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cmd_ld_ko_o = $(LD) -r $(LDFLAGS) \
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$(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \
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@ -129,78 +125,7 @@ $(modules): %.ko :%.o %.mod.o FORCE
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$(call if_changed,ld_ko_o)
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targets += $(modules)
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else
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quiet_cmd_ld_ko_unsigned_o = LD [M] $@
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cmd_ld_ko_unsigned_o = \
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$(LD) -r $(LDFLAGS) \
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$(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \
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-o $@ $(filter-out FORCE,$^) \
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$(if $(AFTER_LINK),; $(AFTER_LINK))
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$(modules:.ko=.ko.unsigned): %.ko.unsigned :%.o %.mod.o FORCE
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$(call if_changed,ld_ko_unsigned_o)
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targets += $(modules:.ko=.ko.unsigned)
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# Step 7), sign the modules
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MODSECKEY = ./signing_key.priv
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MODPUBKEY = ./signing_key.x509
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ifeq ($(wildcard $(MODSECKEY))+$(wildcard $(MODPUBKEY)),$(MODSECKEY)+$(MODPUBKEY))
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ifeq ($(KBUILD_SRC),)
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# no O= is being used
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SCRIPTS_DIR := scripts
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else
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SCRIPTS_DIR := $(KBUILD_SRC)/scripts
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endif
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SIGN_MODULES := 1
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else
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SIGN_MODULES := 0
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endif
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# only sign if it's an in-tree module
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ifneq ($(KBUILD_EXTMOD),)
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SIGN_MODULES := 0
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endif
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# We strip the module as best we can - note that using both strip and eu-strip
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# results in a smaller module than using either alone.
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EU_STRIP = $(shell which eu-strip || echo true)
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quiet_cmd_sign_ko_stripped_ko_unsigned = STRIP [M] $@
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cmd_sign_ko_stripped_ko_unsigned = \
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cp $< $@ && \
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strip -x -g $@ && \
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$(EU_STRIP) $@
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ifeq ($(SIGN_MODULES),1)
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quiet_cmd_genkeyid = GENKEYID $@
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cmd_genkeyid = \
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perl $(SCRIPTS_DIR)/x509keyid $< $<.signer $<.keyid
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%.signer %.keyid: %
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$(call if_changed,genkeyid)
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KEYRING_DEP := $(MODSECKEY) $(MODPUBKEY) $(MODPUBKEY).signer $(MODPUBKEY).keyid
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quiet_cmd_sign_ko_ko_stripped = SIGN [M] $@
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cmd_sign_ko_ko_stripped = \
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sh $(SCRIPTS_DIR)/sign-file $(MODSECKEY) $(MODPUBKEY) $< $@
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else
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KEYRING_DEP :=
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quiet_cmd_sign_ko_ko_unsigned = NO SIGN [M] $@
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cmd_sign_ko_ko_unsigned = \
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cp $< $@
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endif
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$(modules): %.ko :%.ko.stripped $(KEYRING_DEP) FORCE
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$(call if_changed,sign_ko_ko_stripped)
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$(patsubst %.ko,%.ko.stripped,$(modules)): %.ko.stripped :%.ko.unsigned FORCE
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$(call if_changed,sign_ko_stripped_ko_unsigned)
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targets += $(modules)
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endif
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# Add FORCE to the prequisites of a target to force it to be always rebuilt.
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# ---------------------------------------------------------------------------
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@ -1,8 +1,8 @@
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#!/bin/sh
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#!/bin/bash
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#
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# Sign a module file using the given key.
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#
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# Format: sign-file <key> <x509> <src-file> <dst-file>
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# Format: sign-file <key> <x509> <keyid-script> <module>
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#
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scripts=`dirname $0`
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@ -15,8 +15,8 @@ fi
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key="$1"
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x509="$2"
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src="$3"
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dst="$4"
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keyid_script="$3"
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mod="$4"
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if [ ! -r "$key" ]
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then
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@ -29,16 +29,6 @@ then
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echo "Can't read X.509 certificate" >&2
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exit 2
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fi
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if [ ! -r "$x509.signer" ]
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then
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echo "Can't read Signer name" >&2
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exit 2;
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fi
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if [ ! -r "$x509.keyid" ]
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then
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echo "Can't read Key identifier" >&2
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exit 2;
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fi
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#
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# Signature parameters
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@ -83,33 +73,35 @@ fi
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(
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perl -e "binmode STDOUT; print pack(\"C*\", $prologue)" || exit $?
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openssl dgst $dgst -binary $src || exit $?
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) >$src.dig || exit $?
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openssl dgst $dgst -binary $mod || exit $?
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) >$mod.dig || exit $?
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#
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# Generate the binary signature, which will be just the integer that comprises
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# the signature with no metadata attached.
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#
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openssl rsautl -sign -inkey $key -keyform PEM -in $src.dig -out $src.sig || exit $?
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signerlen=`stat -c %s $x509.signer`
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keyidlen=`stat -c %s $x509.keyid`
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siglen=`stat -c %s $src.sig`
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openssl rsautl -sign -inkey $key -keyform PEM -in $mod.dig -out $mod.sig || exit $?
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SIGNER="`perl $keyid_script $x509 signer-name`"
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KEYID="`perl $keyid_script $x509 keyid`"
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keyidlen=${#KEYID}
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siglen=${#SIGNER}
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#
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# Build the signed binary
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#
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(
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cat $src || exit $?
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cat $mod || exit $?
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echo '~Module signature appended~' || exit $?
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cat $x509.signer $x509.keyid || exit $?
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echo -n "$SIGNER" || exit $?
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echo -n "$KEYID" || exit $?
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# Preface each signature integer with a 2-byte BE length
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perl -e "binmode STDOUT; print pack(\"n\", $siglen)" || exit $?
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cat $src.sig || exit $?
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cat $mod.sig || exit $?
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# Generate the information block
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perl -e "binmode STDOUT; print pack(\"CCCCCxxxN\", $algo, $hash, $id_type, $signerlen, $keyidlen, $siglen + 2)" || exit $?
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) >$dst~ || exit $?
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) >$mod~ || exit $?
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# Permit in-place signing
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mv $dst~ $dst || exit $?
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mv $mod~ $mod || exit $?
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@ -22,7 +22,7 @@ use strict;
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my $raw_data;
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die "Need three filenames\n" if ($#ARGV != 2);
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die "Need a filename [keyid|signer-name]\n" if ($#ARGV != 1);
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my $src = $ARGV[0];
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@ -259,10 +259,10 @@ die $src, ": ", "X.509: Couldn't find the Subject Key Identifier extension\n"
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my $id_key_id = asn1_retrieve($subject_key_id->[1]);
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open(OUTFD, ">$ARGV[1]") || die $ARGV[1];
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print OUTFD $id_name;
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close OUTFD || die $ARGV[1];
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open(OUTFD, ">$ARGV[2]") || die $ARGV[2];
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print OUTFD $id_key_id;
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close OUTFD || die $ARGV[2];
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if ($ARGV[1] eq "signer-name") {
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print $id_name;
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} elsif ($ARGV[1] eq "keyid") {
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print $id_key_id;
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} else {
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die "Unknown arg";
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}
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