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doc: imx: habv4: Add Secure Boot guide for i.MX8M SPL targets
Add HABv4 documentation extension for SPL targets covering the following topics: - How to sign an securely boot an flash.bin container image. - How to extend the root of trust for additional boot images. - Add SPL and fitImage CSF examples. - Add signature generation script example. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Breno Lima <breno.lima@nxp.com> Cc: Fabio Estevam <festevam@denx.de> Cc: Heiko Schocher <hs@denx.de> Cc: Peng Fan <peng.fan@nxp.com> Cc: Stefano Babic <sbabic@denx.de> Cc: Utkarsh Gupta <utkarsh.gupta@nxp.com> Cc: Ye Li <ye.li@nxp.com>
This commit is contained in:
Marek Vasut
Stefano Babic
parent
f7aad713c5
commit
0c2c1c9415
4 changed files with 411 additions and 0 deletions
doc/imx/habv4
77
doc/imx/habv4/csf_examples/mx8m/csf.sh
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77
doc/imx/habv4/csf_examples/mx8m/csf.sh
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@ -0,0 +1,77 @@
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#!/bin/sh
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# 0) Generate keys
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#
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# WARNING: ECDSA keys are only supported by HAB 4.5 and newer (i.e. i.MX8M Plus)
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#
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# cd /path/to/cst-3.3.1/keys/
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# ./hab4_pki_tree.sh -existing-ca n -use-ecc n -kl 4096 -duration 10 -num-srk 4 -srk-ca y
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# cd /path/to/cst-3.3.1/crts/
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# ../linux64/bin/srktool -h 4 -t SRK_1_2_3_4_table.bin -e SRK_1_2_3_4_fuse.bin -d sha256 -c ./SRK1_sha256_4096_65537_v3_ca_crt.pem,./SRK2_sha256_4096_65537_v3_ca_crt.pem,./SRK3_sha256_4096_65537_v3_ca_crt.pem,./SRK4_sha256_4096_65537_v3_ca_crt.pem -f 1
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# 1) Build U-Boot (e.g. for i.MX8MM)
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#
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# export ATF_LOAD_ADDR=0x920000
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# cp -Lv /path/to/arm-trusted-firmware/build/imx8mm/release/bl31.bin .
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# cp -Lv /path/to/firmware-imx-8.14/firmware/ddr/synopsys/ddr3* .
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# make -j imx8mm_board_defconfig
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# make -j`nproc` flash.bin
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# 2) Sign SPL and DRAM blobs
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cp doc/imx/habv4/csf_examples/mx8m/csf_spl.txt csf_spl.tmp
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cp doc/imx/habv4/csf_examples/mx8m/csf_fit.txt csf_fit.tmp
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spl_block_base=$(printf "0x%x" $(( $(sed -n "/CONFIG_SPL_TEXT_BASE=/ s@.*=@@p" .config) - 0x40)) )
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spl_block_size=$(printf "0x%x" $(stat -tc %s u-boot-spl-ddr.bin))
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sed -i "/Blocks = / s@.*@ Blocks = $spl_block_base 0x0 $spl_block_size \"flash.bin\"@" csf_spl.tmp
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# Generate CSF blob
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cst -i csf_spl.tmp -o csf_spl.bin
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# Patch CSF blob into flash.bin
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spl_csf_offset=$(xxd -s 24 -l 4 -e flash.bin | cut -d " " -f 2 | sed "s@^@0x@")
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spl_bin_offset=$(xxd -s 4 -l 4 -e flash.bin | cut -d " " -f 2 | sed "s@^@0x@")
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spl_dd_offset=$((${spl_csf_offset} - ${spl_bin_offset} + 0x40))
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dd if=csf_spl.bin of=flash.bin bs=1 seek=${spl_dd_offset} conv=notrunc
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# 3) Sign u-boot.itb
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# fitImage tree
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fit_block_base=$(printf "0x%x" $(( $(sed -n "/CONFIG_SYS_TEXT_BASE=/ s@.*=@@p" .config) - $(sed -n "/CONFIG_FIT_EXTERNAL_OFFSET=/ s@.*=@@p" .config) - 0x200 - 0x40)) )
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fit_block_offset=$(printf "0x%s" $(fdtget -t x u-boot.dtb /binman/imx-boot/uboot offset))
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fit_block_size=$(printf "0x%x" $(( ( $(fdtdump u-boot.itb 2>/dev/null | sed -n "/^...totalsize:/ s@.*\(0x[0-9a-f]\+\).*@\1@p") + 0x1000 - 0x1 ) & ~(0x1000 - 0x1) + 0x20 )) )
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sed -i "/Blocks = / s@.*@ Blocks = $fit_block_base $fit_block_offset $fit_block_size \"flash.bin\", \\\\@" csf_fit.tmp
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# U-Boot
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uboot_block_base=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/uboot load))
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uboot_block_offset=$(printf "0x%x" $(( $(printf "0x%s" $(fdtget -t x u-boot.itb /images/uboot data-position)) + ${fit_block_offset} )))
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uboot_block_size=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/uboot data-size))
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sed -i "/0xuuuu/ s@.*@ $uboot_block_base $uboot_block_offset $uboot_block_size \"flash.bin\", \\\\@" csf_fit.tmp
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# ATF
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atf_block_base=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/atf load))
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atf_block_offset=$(printf "0x%x" $(( $(printf "0x%s" $(fdtget -t x u-boot.itb /images/atf data-position)) + ${fit_block_offset} )))
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atf_block_size=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/atf data-size))
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sed -i "/0xaaaa/ s@.*@ $atf_block_base $atf_block_offset $atf_block_size \"flash.bin\", \\\\@" csf_fit.tmp
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# DTB
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dtb_block_base=$(printf "0x%x" $(( ${uboot_block_base} + ${uboot_block_size} )))
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dtb_block_offset=$(printf "0x%x" $(( $(printf "0x%s" $(fdtget -t x u-boot.itb /images/fdt-1 data-position)) + ${fit_block_offset} )))
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dtb_block_size=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/fdt-1 data-size))
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sed -i "/0xdddd/ s@.*@ $dtb_block_base $dtb_block_offset $dtb_block_size \"flash.bin\"@" csf_fit.tmp
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# IVT
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ivt_ptr_base=$(printf "%08x" ${fit_block_base} | sed "s@\(..\)\(..\)\(..\)\(..\)@0x\4\3\2\1@")
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ivt_block_base=$(printf "%08x" $(( ${fit_block_base} + ${fit_block_size} - 0x20 )) | sed "s@\(..\)\(..\)\(..\)\(..\)@0x\4\3\2\1@")
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csf_block_base=$(printf "%08x" $(( ${fit_block_base} + ${fit_block_size} )) | sed "s@\(..\)\(..\)\(..\)\(..\)@0x\4\3\2\1@")
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ivt_block_offset=$((${fit_block_offset} + ${fit_block_size} - 0x20))
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csf_block_offset=$((${ivt_block_offset} + 0x20))
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echo "0xd1002041 ${ivt_ptr_base} 0x00000000 0x00000000 0x00000000 ${ivt_block_base} ${csf_block_base} 0x00000000" | xxd -r -p > ivt.bin
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dd if=ivt.bin of=flash.bin bs=1 seek=${ivt_block_offset} conv=notrunc
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# Generate CSF blob
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cst -i csf_fit.tmp -o csf_fit.bin
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# Patch CSF blob into flash.bin
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dd if=csf_fit.bin of=flash.bin bs=1 seek=${csf_block_offset} conv=notrunc
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36
doc/imx/habv4/csf_examples/mx8m/csf_fit.txt
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36
doc/imx/habv4/csf_examples/mx8m/csf_fit.txt
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[Header]
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Version = 4.3
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Hash Algorithm = sha256
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Engine = CAAM
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Engine Configuration = 0
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Certificate Format = X509
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Signature Format = CMS
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[Install SRK]
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# FIXME: Adjust path here
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File = "/path/to/cst-3.3.1/crts/SRK_1_2_3_4_table.bin"
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Source index = 0
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[Install CSFK]
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# FIXME: Adjust path here
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File = "/path/to/cst-3.3.1/crts/CSF1_1_sha256_4096_65537_v3_usr_crt.pem"
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[Authenticate CSF]
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[Install Key]
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Verification index = 0
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Target Index = 2
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# FIXME: Adjust path here
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File = "/path/to/cst-3.3.1/crts/IMG1_1_sha256_4096_65537_v3_usr_crt.pem"
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[Authenticate Data]
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Verification index = 2
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# FIXME:
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# Line 1 -- fitImage tree
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# Line 2 -- U-Boot u-boot-nodtb.bin blob
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# Line 3 -- ATF BL31 blob
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# Line 4 -- DT blob
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Blocks = 0x401fcdc0 0x57c00 0xffff "flash.bin", \
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0x40200000 0x62c00 0xuuuu "flash.bin", \
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0x920000 0x00000 0xaaaa "flash.bin", \
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0x40200000 0x00000 0xdddd "flash.bin"
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33
doc/imx/habv4/csf_examples/mx8m/csf_spl.txt
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33
doc/imx/habv4/csf_examples/mx8m/csf_spl.txt
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[Header]
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Version = 4.3
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Hash Algorithm = sha256
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Engine = CAAM
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Engine Configuration = 0
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Certificate Format = X509
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Signature Format = CMS
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[Install SRK]
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# FIXME: Adjust path here
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File = "/path/to/cst-3.3.1/crts/SRK_1_2_3_4_table.bin"
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Source index = 0
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[Install CSFK]
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# FIXME: Adjust path here
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File = "/path/to/cst-3.3.1/crts/CSF1_1_sha256_4096_65537_v3_usr_crt.pem"
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[Authenticate CSF]
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[Unlock]
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Engine = CAAM
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Features = MID
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[Install Key]
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Verification index = 0
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Target Index = 2
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# FIXME: Adjust path here
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File = "/path/to/cst-3.3.1/crts/IMG1_1_sha256_4096_65537_v3_usr_crt.pem"
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[Authenticate Data]
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Verification index = 2
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# FIXME: Adjust start (first column) and size (third column) here
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Blocks = 0x7e0fc0 0x0 0x306f0 "flash.bin"
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265
doc/imx/habv4/guides/mx8m_spl_secure_boot.txt
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265
doc/imx/habv4/guides/mx8m_spl_secure_boot.txt
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+=========================================================+
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+ i.MX8M U-Boot HABv4 Secure Boot guide for SPL targets +
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+=========================================================+
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1. HABv4 secure boot process
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-----------------------------
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This document is an addendum of mx6_mx7_spl_secure_boot.txt guide describing
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a step-by-step procedure on how to sign and securely boot an U-Boot image for
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SPL targets on i.MX8M, i.MX8M Mini, i.MX8M Nano, i.MX8M Plus.
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Details about HAB can be found in the application note AN4581[1] and in the
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introduction_habv4.txt document.
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1.1 Building a SPL target supporting secure boot
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-------------------------------------------------
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The U-Boot build for i.MX8M SoC makes use of Second Program Loader (SPL)
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support, fitImage support and custom i.MX8M specific flash.bin container.
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This leads to a generation of multiple intermediate build artifacts, the
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U-Boot SPL, U-Boot binary, DT blob. These later two artifacts are bundled
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with external ATF BL31 blob to form a fitImage. The fitImage is bundled
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with SPL and external DDR and optional HDMI PHY initialization blobs to
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form the final flash.bin container. The HABv4 can be used to authenticate
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all of the input binaries separately.
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Out of reset the ROM code authenticates the SPL and PHY initialization
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blobs, combination of which is responsible for initializing essential
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features such as DDR, UART, PMIC and clock enablement. Once the DDR is
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available, the SPL code loads the secondary fitImage to its specific
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address and call the HAB APIs to extend the root of trust on its
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components.
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The U-Boot SPL provides support to secure boot configuration and also
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provide access to the HAB APIs exposed by the ROM vector table, the
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U-Boot provides access to HAB APIs via SMC calls to ATF. The support
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is enabled by selecting the CONFIG_IMX_HAB option.
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When built with this configuration the U-Boot correctly pads combined
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SPL and PHY initialization blob image, called u-boot-spl-ddr.bin, by
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aligning to the next 0xC00 address, so the CSF signature data generated
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by CST can be concatenated to the image.
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The U-Boot also reserves space in the fitImage binary (u-boot.itb) between
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the fitImage tree and external blobs included in it, so it can be used to
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inject IVT and CST signatures used by SPL HAB calls to authenticate the
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fitImage components.
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The diagram below illustrate a signed SPL combined with DDR PHY
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initialization firmware blobs part of flash.bin container layout.
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This part is loaded to memory address ( CONFIG_SPL_TEXT_BASE - 0x40 ) and
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authenticated the BootROM. The reason for the offset is so that the *entry
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would be at memory address CONFIG_SPL_TEXT_BASE when BootROM executes the
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code within it:
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------- +-----------------------------+ <-- *start
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^ | Image Vector Table |
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| | (0x20 bytes) |
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| +-----------------------------+ <-- *boot_data
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| | Boot Data |
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| +-----------------------------+
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| | Padding |
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Signed | | to 0x40 bytes from *start |
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Data | +-----------------------------+ <-- *entry
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| | |
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| | SPL combined with DDR PHY |
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| | initialization blobs |
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| | (u-boot-spl-ddr.bin) |
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| | |
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| +-----------------------------+
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v | Padding |
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------- +-----------------------------+ <-- *csf
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| |
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| Command Sequence File (CSF) |
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| |
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+-----------------------------+
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| Padding (optional) |
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+-----------------------------+
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The diagram below illustrate a signed U-Boot binary, DT blob and external
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ATF BL31 blob combined to form fitImage part of flash.bin container layout.
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The *load_address is derived from CONFIG_SYS_TEXT_BASE such that the U-Boot
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binary *start is placed exactly at CONFIG_SPL_TEXT_BASE in DRAM, however the
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SPL moves the fitImage tree further to location:
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*load_address = CONFIG_SPL_TEXT_BASE - CONFIG_FIT_EXTERNAL_OFFSET (=12kiB) -
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512 Byte sector - sizeof(mkimage header)
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------- +-----------------------------+ <-- *load_address
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^ | |
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| | fitImage tree |
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| | with external data at |
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| | offset 12 kiB from tree |
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| | (cca. 1 kiB) |
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Signed | | |
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.----- Tree | +-----------------------------+
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| Data | | Padding to next 4k aligned |
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| | | from *load_address |
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| | +-----------------------------+ <-- *ivt
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| | | Image Vector Table |
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| v | (0x20 bytes) |
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| ------- +-----------------------------+ <-- *csf
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| | Command Sequence File (CSF) |
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| | for all signed entries in |
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>--------------->| the fitImage, tree and data |
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| | (cca 6-7 kiB) |
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| +-----------------------------+
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| | Padding to 12 kiB offset |
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| | from *load_address |
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| ------- +-----------------------------+ <-- *start
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| ^ | |
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| Signed | | |
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|---- Payload | | U-Boot external data blob |
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| Data | | |
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| v | |
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| ------- +-----------------------------+
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| | Padding to 4 Bytes |
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| ------- +-----------------------------+
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| ^ | |
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| Signed | | |
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|---- Payload | | ATF external data blob |
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| Data | | |
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| v | |
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| ------- +-----------------------------+
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| | Padding to 4 Bytes |
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| ------- +-----------------------------+
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| ^ | |
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| Signed | | |
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'---- Payload | | DTB external data blob |
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Data | | |
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v | |
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------- +-----------------------------+
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The diagram below illustrate a combined flash.bin container layout:
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+-----------------------------+
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| Signed SPL part |
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+-----------------------------+
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| Signed fitImage part |
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+-----------------------------+
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1.2 Enabling the secure boot support
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-------------------------------------
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The first step is to generate an U-Boot image supporting the HAB features
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mentioned above, this can be achieved by adding CONFIG_IMX_HAB to the
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build configuration:
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- Defconfig:
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CONFIG_IMX_HAB=y
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- Kconfig:
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ARM architecture -> Support i.MX HAB features
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1.3 Signing the images
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-----------------------
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The CSF contains all the commands that the HAB executes during the secure
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boot. These commands instruct the HAB code on which memory areas of the image
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to authenticate, which keys to install, use and etc.
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CSF examples are available under doc/imx/habv4/csf_examples/ directory.
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CSF "Blocks" line for csf_spl.txt can be generated as follows:
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```
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spl_block_base=$(printf "0x%x" $(( $(sed -n "/CONFIG_SPL_TEXT_BASE=/ s@.*=@@p" .config) - 0x40)) )
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spl_block_size=$(printf "0x%x" $(stat -tc %s u-boot-spl-ddr.bin))
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sed -i "/Blocks = / s@.*@ Blocks = $spl_block_base 0x0 $spl_block_size \"flash.bin\"@" csf_spl.txt
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```
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The resulting line looks as follows:
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```
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Blocks = 0x7e0fc0 0x0 0x306f0 "flash.bin"
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```
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The columns mean:
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- CONFIG_SPL_TEXT_BASE - 0x40 -- Start address of signed data, in DRAM
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- 0x0 -- Start address of signed data, in "flash.bin"
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- 0x306f0 -- Length of signed data, in "flash.bin"
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- Filename -- "flash.bin"
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To generate signature for the SPL part of flash.bin container, use CST:
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```
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cst -i csf_spl.tmp -o csf_spl.bin
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```
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The newly generated CST blob has to be patched into existing flash.bin
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container. Conveniently, flash.bin IVT contains physical address of the
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CSF blob. Remember, the SPL part of flash.bin container is loaded by the
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BootROM at CONFIG_SPL_TEXT_BASE - 0x40 , so the offset of CSF blob in
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the fitImage can be calculated and inserted into the flash.bin in the
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correct location as follows:
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```
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# offset = IVT_HEADER[6 = CSF address] - CONFIG_SPL_TEXT_BASE - 0x40
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spl_csf_offset=$(xxd -s 24 -l 4 -e flash.bin | cut -d " " -f 2 | sed "s@^@0x@")
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spl_bin_offset=$(xxd -s 4 -l 4 -e flash.bin | cut -d " " -f 2 | sed "s@^@0x@")
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spl_dd_offset=$((${spl_csf_offset} - ${spl_bin_offset} + 0x40))
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dd if=csf_spl.bin of=flash.bin bs=1 seek=${spl_dd_offset} conv=notrunc
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```
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||||
|
||||
CSF "Blocks" line for csf_fit.txt can be generated as follows:
|
||||
```
|
||||
# fitImage tree
|
||||
fit_block_base=$(printf "0x%x" $(( $(sed -n "/CONFIG_SYS_TEXT_BASE=/ s@.*=@@p" .config) - $(sed -n "/CONFIG_FIT_EXTERNAL_OFFSET=/ s@.*=@@p" .config) - 0x200 - 0x40)) )
|
||||
fit_block_offset=$(printf "0x%s" $(fdtget -t x u-boot.dtb /binman/imx-boot/uboot offset))
|
||||
fit_block_size=$(printf "0x%x" $(( ( $(fdtdump u-boot.itb 2>/dev/null | sed -n "/^...totalsize:/ s@.*\(0x[0-9a-f]\+\).*@\1@p") + 0x1000 - 0x1 ) & ~(0x1000 - 0x1) + 0x20 )) )
|
||||
sed -i "/Blocks = / s@.*@ Blocks = $fit_block_base $fit_block_offset $fit_block_size \"flash.bin\", \\\\@" csf_fit.tmp
|
||||
|
||||
# U-Boot
|
||||
uboot_block_base=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/uboot load))
|
||||
uboot_block_offset=$(printf "0x%x" $(( $(printf "0x%s" $(fdtget -t x u-boot.itb /images/uboot data-position)) + ${fit_block_offset} )))
|
||||
uboot_block_size=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/uboot data-size))
|
||||
sed -i "/0xuuuu/ s@.*@ $uboot_block_base $uboot_block_offset $uboot_block_size \"flash.bin\", \\\\@" csf_fit.tmp
|
||||
|
||||
# ATF
|
||||
atf_block_base=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/atf load))
|
||||
atf_block_offset=$(printf "0x%x" $(( $(printf "0x%s" $(fdtget -t x u-boot.itb /images/atf data-position)) + ${fit_block_offset} )))
|
||||
atf_block_size=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/atf data-size))
|
||||
sed -i "/0xaaaa/ s@.*@ $atf_block_base $atf_block_offset $atf_block_size \"flash.bin\", \\\\@" csf_fit.tmp
|
||||
|
||||
# DTB
|
||||
dtb_block_base=$(printf "0x%x" $(( ${uboot_block_base} + ${uboot_block_size} )))
|
||||
dtb_block_offset=$(printf "0x%x" $(( $(printf "0x%s" $(fdtget -t x u-boot.itb /images/fdt-1 data-position)) + ${fit_block_offset} )))
|
||||
dtb_block_size=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/fdt-1 data-size))
|
||||
sed -i "/0xdddd/ s@.*@ $dtb_block_base $dtb_block_offset $dtb_block_size \"flash.bin\"@" csf_fit.tmp
|
||||
```
|
||||
|
||||
The fitImage part of flash.bin requires separate IVT. Generate the IVT and
|
||||
patch it into the correct aligned location of flash.bin as follows:
|
||||
```
|
||||
# IVT
|
||||
ivt_ptr_base=$(printf "%08x" ${fit_block_base} | sed "s@\(..\)\(..\)\(..\)\(..\)@0x\4\3\2\1@")
|
||||
ivt_block_base=$(printf "%08x" $(( ${fit_block_base} + ${fit_block_size} - 0x20 )) | sed "s@\(..\)\(..\)\(..\)\(..\)@0x\4\3\2\1@")
|
||||
csf_block_base=$(printf "%08x" $(( ${fit_block_base} + ${fit_block_size} )) | sed "s@\(..\)\(..\)\(..\)\(..\)@0x\4\3\2\1@")
|
||||
ivt_block_offset=$((${fit_block_offset} + ${fit_block_size} - 0x20))
|
||||
csf_block_offset=$((${ivt_block_offset} + 0x20))
|
||||
|
||||
echo "0xd1002041 ${ivt_ptr_base} 0x00000000 0x00000000 0x00000000 ${ivt_block_base} ${csf_block_base} 0x00000000" | xxd -r -p > ivt.bin
|
||||
dd if=ivt.bin of=flash.bin bs=1 seek=${ivt_block_offset} conv=notrunc
|
||||
|
||||
To generate CSF signature for the fitImage part of flash.bin container, use CST:
|
||||
```
|
||||
cst -i csf_fit.tmp -o csf_fit.bin
|
||||
```
|
||||
|
||||
Finally, patch the CSF signature into the fitImage right past the IVT:
|
||||
```
|
||||
dd if=csf_fit.bin of=flash.bin bs=1 seek=${csf_block_offset} conv=notrunc
|
||||
```
|
||||
|
||||
The entire script is available in doc/imx/habv4/csf_examples/mx8m/csf.sh
|
||||
|
||||
1.4 Closing the device
|
||||
-----------------------
|
||||
|
||||
The procedure for closing the device is similar as in Non-SPL targets, for a
|
||||
complete procedure please refer to section "1.5 Programming SRK Hash" in
|
||||
mx6_mx7_secure_boot.txt document available under doc/imx/habv4/guides/
|
||||
directory.
|
||||
|
||||
References:
|
||||
[1] AN4581: "Secure Boot on i.MX 50, i.MX 53, i.MX 6 and i.MX 7 Series using
|
||||
HABv4" - Rev 2.
|
||||
Loading…
Add table
Reference in a new issue