99 lines
3.1 KiB
Diff
99 lines
3.1 KiB
Diff
From 01120b5ec61ae7bbe550b1e2fe0f75c2d2073b1f Mon Sep 17 00:00:00 2001
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From: Hongxu Jia <hongxu.jia@windriver.com>
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Date: Fri, 6 May 2022 15:44:14 +0800
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Subject: [PATCH] grub verify: Add skip_check_cfg variable
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While check_signatures enabled, with skip_check_cfg set to 1
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- Do not verify the signature on the file that has suffix `.cfg'
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- Do not authenticate user and password if cfg is changed
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Implement function grub_strendswith to find cfg file
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Upstream-Status: Pending
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Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
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---
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grub-core/commands/pgp.c | 12 ++++++++++++
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grub-core/kern/misc.c | 12 ++++++++++++
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grub-core/normal/auth.c | 5 +++++
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include/grub/misc.h | 1 +
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4 files changed, 30 insertions(+)
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diff --git a/grub-core/commands/pgp.c b/grub-core/commands/pgp.c
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index 5daa1e9..e60a29a 100644
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--- a/grub-core/commands/pgp.c
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+++ b/grub-core/commands/pgp.c
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@@ -873,6 +873,18 @@ grub_pubkey_init (grub_file_t io, enum grub_file_type type __attribute__ ((unuse
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char *fsuf, *ptr;
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grub_err_t err;
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struct grub_pubkey_context *ctxt;
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+ const char *val;
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+
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+ /* SKip to check the signature of cfg */
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+ val = grub_env_get ("skip_check_cfg");
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+ if (val && (val[0] == '1'))
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+ {
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+ if (grub_strendswith (io->name, ".cfg"))
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+ {
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+ *flags = GRUB_VERIFY_FLAGS_SKIP_VERIFICATION;
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+ return GRUB_ERR_NONE;
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+ }
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+ }
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if (!sec)
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{
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diff --git a/grub-core/kern/misc.c b/grub-core/kern/misc.c
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index 3af336e..8bf1d90 100644
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--- a/grub-core/kern/misc.c
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+++ b/grub-core/kern/misc.c
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@@ -280,6 +280,18 @@ grub_strncmp (const char *s1, const char *s2, grub_size_t n)
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return (int) (grub_uint8_t) *s1 - (int) (grub_uint8_t) *s2;
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}
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+int
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+grub_strendswith (const char *str, const char *suffix)
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+{
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+ if (!str || !suffix)
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+ return 0;
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+ grub_size_t lenstr = grub_strlen(str);
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+ grub_size_t lensuffix = grub_strlen(suffix);
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+ if (lensuffix > lenstr)
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+ return 0;
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+ return grub_strncmp(str + lenstr - lensuffix, suffix, lensuffix) == 0;
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+}
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+
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char *
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grub_strchr (const char *s, int c)
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{
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diff --git a/grub-core/normal/auth.c b/grub-core/normal/auth.c
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index 6be678c..57a1a42 100644
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--- a/grub-core/normal/auth.c
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+++ b/grub-core/normal/auth.c
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@@ -136,6 +136,11 @@ is_authenticated (const char *userlist)
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const char *superusers;
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struct grub_auth_user *user;
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+ /* SKip to authenticate grub cfg */
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+ const char *val = grub_env_get ("skip_check_cfg");
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+ if (val && (val[0] == '1'))
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+ return 1;
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+
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superusers = grub_env_get ("superusers");
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if (!superusers)
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diff --git a/include/grub/misc.h b/include/grub/misc.h
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index 7d2b551..cce29d7 100644
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--- a/include/grub/misc.h
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+++ b/include/grub/misc.h
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@@ -82,6 +82,7 @@ grub_memcpy (void *dest, const void *src, grub_size_t n)
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int EXPORT_FUNC(grub_memcmp) (const void *s1, const void *s2, grub_size_t n);
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int EXPORT_FUNC(grub_strcmp) (const char *s1, const char *s2);
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int EXPORT_FUNC(grub_strncmp) (const char *s1, const char *s2, grub_size_t n);
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+int EXPORT_FUNC(grub_strendswith) (const char *str, const char *suffix);
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char *EXPORT_FUNC(grub_strchr) (const char *s, int c);
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char *EXPORT_FUNC(grub_strrchr) (const char *s, int c);
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--
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2.17.1
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