273701a5b2
evmctl provides signing support for IMA/EVM. Functionality includes signing of file content (IMA), file metadata (EVM), importing public keys into kernel keyring. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
41 lines
1010 B
Plaintext
41 lines
1010 B
Plaintext
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1. Generate private key
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openssl genrsa -out privkey_evm.pem 1024
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2. Generate public key
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openssl rsa -pubout -in privkey_evm.pem -out pubkey_evm.pem
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3. Copy public (+private if to sign on device) key to the device/qemu /etc/keys
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scp pubkey_evm.pem mad:/etc/keys
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4. Load keys and enable EVM
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evm_enable.sh
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This should be done at early phase, before mounting root filesystem.
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5. Sign EVM and use hash value for IMA - common case
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evmctl sign --imahash test.txt
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6. Sign IMA and EVM - for immutable files and modules
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evmctl sign --imasig test.txt
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7. Sign whole filesystem
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evm_sign_all.sh
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or
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find / \( -fstype rootfs -o -fstype ext3 -o -fstype ext4 \) ! -path "/lib/modules/*" -type f -uid 0 -exec evmctl sign --imahash '{}' \;
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find /lib/modules ! -name "*.ko" -type f -uid 0 -exec evmctl sign --imahash '{}' \;
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# security.ima needs to have signature for modules
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find /lib/modules -name "*.ko" -type f -uid 0 -exec evmctl sign --imasig '{}' \;
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8. Label filesystem in fix mode...
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ima_fix_dir.sh <dir>
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