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--- clevis-15.ori/src/clevis.1.adoc 2020-10-28 19:55:47.663228800 +0100
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+++ clevis-15/src/clevis.1.adoc 2023-01-11 17:18:29.967295005 +0100
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@@ -101,7 +101,7 @@
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This command performs four steps:
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-1. Creates a new key with the same entropy as the LUKS master key.
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+1. Creates a new key with the same entropy as the LUKS master key -- maximum entropy bits is 256.
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2. Encrypts the new key with Clevis.
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3. Stores the Clevis JWE in the LUKS header.
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4. Enables the new key for use with LUKS.
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--- clevis-15.ori/src/luks/clevis-luks-bind.1.adoc 2020-10-28 19:55:47.663228800 +0100
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+++ clevis-15/src/luks/clevis-luks-bind.1.adoc 2023-01-11 17:18:55.239351209 +0100
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@@ -20,7 +20,7 @@
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This command performs four steps:
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-1. Creates a new key with the same entropy as the LUKS master key.
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+1. Creates a new key with the same entropy as the LUKS master key -- maximum entropy bits is 256.
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2. Encrypts the new key with Clevis.
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3. Stores the Clevis JWE in the LUKS header.
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4. Enables the new key for use with LUKS.
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--- clevis-15.ori/src/luks/clevis-luks-common-functions 2023-01-11 17:15:44.984928070 +0100
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+++ clevis-15/src/luks/clevis-luks-common-functions 2023-01-11 17:20:53.238613637 +0100
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@@ -865,6 +865,7 @@
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[ -z "${DEV}" ] && return 1
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local dump filter bits
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+ local MAX_ENTROPY_BITS=256
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dump=$(cryptsetup luksDump "${DEV}")
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if cryptsetup isLuks --type luks1 "${DEV}"; then
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filter="$(echo "${dump}" | sed -rn 's|MK bits:[ \t]*([0-9]+)|\1|p')"
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@@ -876,6 +877,9 @@
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fi
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bits="$(echo -n "${filter}" | sort -n | tail -n 1)"
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+ if [ "${bits}" -gt "${MAX_ENTROPY_BITS}" ]; then
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+ bits="${MAX_ENTROPY_BITS}"
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+ fi
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pwmake "${bits}"
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}
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--- clevis-15.ori/src/luks/clevis-luks-bind.in 2023-01-11 17:15:44.815927694 +0100
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+++ clevis-15/src/luks/clevis-luks-bind.in 2023-01-12 16:20:30.266404993 +0100
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@@ -19,6 +19,8 @@
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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+. clevis-luks-common-functions
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+
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SUMMARY="Binds a LUKS device using the specified policy"
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UUID=cb6e8904-81ff-40da-a84a-07ab9ab5715e
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@@ -139,14 +141,11 @@
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fi
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# Generate a key with the same entropy as the LUKS Master Key
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-key="$(pwmake "$(
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-cryptsetup luksDump "$DEV" \
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- | if [ "$luks_type" == "luks1" ]; then
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- sed -rn 's|MK bits:[ \t]*([0-9]+)|\1|p'
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- else
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- sed -rn 's|^\s+Key:\s+([0-9]+) bits\s*$|\1|p'
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- fi | sort -n | tail -n 1
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-)")"
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+if ! key="$(clevis_luks_generate_key "${DEV}")" \
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+ || [ -z "${key}" ]; then
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+ echo "Unable to generate key for ${DEV}" >&2
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+ return 1
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+fi
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# Encrypt the new key
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jwe="$(echo -n "$key" | clevis encrypt "$PIN" "$CFG" "${YES}")"
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