3ba6ddf1b2
* 0001-10_linux-Do-not-enable-BLSCFG-on-s390-emu.patch - Fix xen package contains debug_info files with the .module suffix by moving them to a separate xen-debug subpackage (bsc#1232573) OBS-URL: https://build.opensuse.org/package/show/Base:System/grub2?expand=0&rev=520
49 lines
1.6 KiB
Diff
49 lines
1.6 KiB
Diff
From 5a690183091c2c161481123b17e1925148e516e4 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Tue, 30 Nov 2021 15:00:57 +1100
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Subject: [PATCH 23/23] x509: allow Digitial Signature plus other Key Usages
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Currently the x509 certificate parser for appended signature
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verification requires that the certificate have the Digitial Signature
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key usage and _only_ the Digitial Signature use. This is overly strict
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and becomes policy enforcement rather than a security property.
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Require that the Digitial Signature usage is present, but do not
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require that it is the only usage present.
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Reported-by: Michal Suchanek <msuchanek@suse.com>
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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---
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grub-core/commands/appendedsig/x509.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/grub-core/commands/appendedsig/x509.c b/grub-core/commands/appendedsig/x509.c
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index 70480aa73..6ae985b30 100644
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--- a/grub-core/commands/appendedsig/x509.c
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+++ b/grub-core/commands/appendedsig/x509.c
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@@ -547,7 +547,7 @@ cleanup:
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/*
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* Verify the Key Usage extension.
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- * We only permit the Digital signature usage.
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+ * We require the Digital signature usage.
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*/
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static grub_err_t
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verify_key_usage (grub_uint8_t *value, int value_size)
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@@ -586,10 +586,10 @@ verify_key_usage (grub_uint8_t *value, int value_size)
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goto cleanup;
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}
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- if (usage != digitalSignatureUsage)
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+ if (!(usage & digitalSignatureUsage))
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{
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err =
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- grub_error (GRUB_ERR_BAD_FILE_TYPE, "Unexpected Key Usage value: %x",
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+ grub_error (GRUB_ERR_BAD_FILE_TYPE, "Key Usage (0x%x) missing Digital Signature usage",
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usage);
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goto cleanup;
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}
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--
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2.31.1
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