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Add SBAT and mok-variables support

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Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
This commit is contained in:
Javier Martinez Canillas 2021-03-17 14:26:57 +01:00
parent 9676dbc27a
commit 8f885a4b9e
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GPG Key ID: C751E590D63F3D69
3 changed files with 371 additions and 1 deletions
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124
0003-mokutil-Add-option-to-print-the-UEFI-SBAT-variable-c.patch Normal file
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@ -0,0 +1,124 @@
From 698994102afcbbe16e65930a09e0df5248c4d200 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Wed, 17 Mar 2021 14:38:57 +0100
Subject: [PATCH] mokutil: Add option to print the UEFI SBAT variable content
This variable contains the descriptive form of all the components used by
the operating systems that ship signed shim binaries. Along with a minimum
generation number for each component. More information in can be found in
the UEFI Secure Boot Advanced Targeting (SBAT) specification:
https://github.com/rhboot/shim/blob/main/SBAT.md
Since a SBAT variable contains a set of Comma Separated Values (CSV) UTF-8
encoded strings, the data could just be printed without the need to do any
previous processing.
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
man/mokutil.1 | 5 +++++
src/mokutil.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 38 insertions(+)
diff --git a/man/mokutil.1 b/man/mokutil.1
index 25fe8b433da..446298763ad 100644
--- a/man/mokutil.1
+++ b/man/mokutil.1
@@ -73,6 +73,8 @@ mokutil \- utility to manipulate machine owner keys
.br
\fBmokutil\fR [--dbx]
.br
+\fBmokutil\fR [--sbat]
+.br
.SH DESCRIPTION
\fBmokutil\fR is a tool to import or delete the machines owner keys
@@ -173,3 +175,6 @@ List the keys in the secure boot signature store (db)
\fB--dbx\fR
List the keys in the secure boot blacklist signature store (dbx)
.TP
+\fB--sbat\fR
+List the entries in the Secure Boot Advanced Targeting store (SBAT)
+.TP
diff --git a/src/mokutil.c b/src/mokutil.c
index b66c1b8b5a7..0c25ae5033d 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -84,6 +84,7 @@
#define DELETE_HASH (1 << 22)
#define VERBOSITY (1 << 23)
#define TIMEOUT (1 << 24)
+#define LIST_SBAT (1 << 25)
#define DEFAULT_CRYPT_METHOD SHA512_BASED
#define DEFAULT_SALT_SIZE SHA512_SALT_MAX
@@ -176,6 +177,7 @@ print_help ()
printf (" --db\t\t\t\t\tList the keys in db\n");
printf (" --dbx\t\t\t\t\tList the keys in dbx\n");
printf (" --timeout <-1,0..0x7fff>\t\tSet the timeout for MOK prompt\n");
+ printf (" --sbat\t\t\t\tList the entries in SBAT\n");
printf ("\n");
printf ("Supplimentary Options:\n");
printf (" --hash-file <hash file>\t\tUse the specific password hash\n");
@@ -1598,6 +1600,31 @@ error:
return ret;
}
+static int
+print_var_content (const char *var_name, const efi_guid_t guid)
+{
+ uint8_t *data = NULL;
+ size_t data_size;
+ uint32_t attributes;
+ int ret;
+
+ ret = efi_get_variable (guid, var_name, &data, &data_size, &attributes);
+ if (ret < 0) {
+ if (errno == ENOENT) {
+ printf ("%s is empty\n", var_name);
+ return 0;
+ }
+
+ fprintf (stderr, "Failed to read %s: %m\n", var_name);
+ return -1;
+ }
+
+ printf ("%s", data);
+ free (data);
+
+ return ret;
+}
+
static int
revoke_request (MokRequest req)
{
@@ -2187,6 +2214,7 @@ main (int argc, char *argv[])
{"kek", no_argument, 0, 0 },
{"db", no_argument, 0, 0 },
{"dbx", no_argument, 0, 0 },
+ {"sbat", no_argument, 0, 0 },
{"timeout", required_argument, 0, 0 },
{0, 0, 0, 0}
};
@@ -2271,6 +2299,8 @@ main (int argc, char *argv[])
} else {
db_name = DBX;
}
+ } else if (strcmp (option, "sbat") == 0) {
+ command |= LIST_SBAT;
} else if (strcmp (option, "timeout") == 0) {
command |= TIMEOUT;
timeout = strdup (optarg);
@@ -2543,6 +2573,9 @@ main (int argc, char *argv[])
case TIMEOUT:
ret = set_timeout (timeout);
break;
+ case LIST_SBAT:
+ ret = print_var_content ("SBAT", efi_guid_shim);
+ break;
default:
print_help ();
break;
--
2.29.2

241
0004-mokutil-add-mok-variables-parsing-support.patch Normal file
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@ -0,0 +1,241 @@
From 256639accc910e60496fffef96128dc1afd0fa3a Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Wed, 17 Mar 2021 14:49:21 +0100
Subject: [PATCH] mokutil: add mok-variables parsing support
his patch adds support for getting mok variables from
/sys/firmware/efi/mok-variables/$NAME , if they are present, as well as
for checking MokListRT, MokListRT1, MokListRT2, etc., for any of the mok
variables.
Signed-off-by: Peter Jones <pjones@redhat.com>
---
src/mokutil.c | 175 +++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 151 insertions(+), 24 deletions(-)
diff --git a/src/mokutil.c b/src/mokutil.c
index 0c25ae5033d..252dc7a327f 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -251,6 +251,63 @@ signature_size (const efi_guid_t *hash_type)
return 0;
}
+static int
+mok_get_variable(const char *name, uint8_t **datap, size_t *data_sizep)
+{
+ char filename[] = "/sys/firmware/efi/mok-variables/implausibly-long-mok-variable-name";
+ size_t filename_sz = sizeof(filename);
+ int fd, rc;
+ struct stat sb = { 0, };
+ uint8_t *buf;
+ size_t bufsz, pos = 0;
+ ssize_t ssz;
+
+ *datap = 0;
+ *data_sizep = 0;
+
+ snprintf(filename, filename_sz, "/sys/firmware/efi/mok-variables/%s", name);
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return fd;
+
+ rc = fstat(fd, &sb);
+ if (rc < 0) {
+err_close:
+ close(fd);
+ return rc;
+ }
+
+ if (sb.st_size == 0) {
+ errno = ENOENT;
+ rc = -1;
+ goto err_close;
+ }
+
+ bufsz = sb.st_size;
+ buf = calloc(1, bufsz);
+ if (!buf)
+ goto err_close;
+
+ while (pos < bufsz) {
+ ssz = read(fd, &buf[pos], bufsz - pos);
+ if (ssz < 0) {
+ if (errno == EAGAIN ||
+ errno == EWOULDBLOCK ||
+ errno == EINTR)
+ continue;
+ free(buf);
+ goto err_close;
+ }
+
+ pos += ssz;
+ }
+ *datap = buf;
+ *data_sizep = pos;
+
+ return 0;
+}
+
static MokListNode*
build_mok_list (void *data, unsigned long data_size, uint32_t *mok_num)
{
@@ -622,25 +679,44 @@ static int
list_keys_in_var (const char *var_name, const efi_guid_t guid)
{
uint8_t *data = NULL;
- size_t data_size;
+ char varname[] = "implausibly-long-mok-variable-name";
+ size_t data_sz, i, varname_sz = sizeof(varname);
uint32_t attributes;
int ret;
- ret = efi_get_variable (guid, var_name, &data, &data_size, &attributes);
- if (ret < 0) {
- if (errno == ENOENT) {
- printf ("%s is empty\n", var_name);
- return 0;
+ ret = mok_get_variable(var_name, &data, &data_sz);
+ if (ret >= 0) {
+ ret = list_keys (data, data_sz);
+ free(data);
+ return ret;
+ }
+
+ for (i = 0; i < SIZE_MAX; i++) {
+ if (i == 0) {
+ snprintf(varname, varname_sz, "%s", var_name);
+ } else {
+ snprintf(varname, varname_sz, "%s%zu", var_name, i);
}
- fprintf (stderr, "Failed to read %s: %m\n", var_name);
- return -1;
- }
+ ret = efi_get_variable (guid, varname, &data, &data_sz,
+ &attributes);
+ if (ret < 0)
+ return 0;
- ret = list_keys (data, data_size);
- free (data);
+ ret = list_keys (data, data_sz);
+ free(data);
+ /*
+ * If ret is < 0, the next one will error as well.
+ * If ret is 0, we need to test the next variable.
+ * If it's 1, that's a real answer.
+ */
+ if (ret < 0)
+ return 0;
+ if (ret > 0)
+ return ret;
+ }
- return ret;
+ return 0;
}
static int
@@ -1039,22 +1115,15 @@ is_valid_cert (void *cert, uint32_t cert_size)
}
static int
-is_duplicate (const efi_guid_t *type, const void *data, const uint32_t data_size,
- const efi_guid_t *vendor, const char *db_name)
+is_one_duplicate (const efi_guid_t *type,
+ const void *data, const uint32_t data_size,
+ uint8_t *var_data, size_t var_data_size)
{
- uint8_t *var_data;
- size_t var_data_size;
- uint32_t attributes;
uint32_t node_num;
MokListNode *list;
int ret = 0;
- if (!data || data_size == 0 || !db_name)
- return 0;
-
- ret = efi_get_variable (*vendor, db_name, &var_data, &var_data_size,
- &attributes);
- if (ret < 0)
+ if (!data || data_size == 0)
return 0;
list = build_mok_list (var_data, var_data_size, &node_num);
@@ -1087,11 +1156,69 @@ is_duplicate (const efi_guid_t *type, const void *data, const uint32_t data_size
done:
if (list)
free (list);
- free (var_data);
return ret;
}
+static int
+is_duplicate (const efi_guid_t *type,
+ const void *data, const uint32_t data_size,
+ const efi_guid_t *vendor, const char *db_name)
+{
+ uint32_t attributes;
+ char varname[] = "implausibly-long-mok-variable-name";
+ size_t varname_sz = sizeof(varname);
+ int ret = 0;
+ size_t i;
+
+ if (!strncmp(db_name, "Mok", 3)) {
+ uint8_t *var_data = NULL;
+ size_t var_data_size = 0;
+ ret = mok_get_variable(db_name, &var_data, &var_data_size);
+ if (ret >= 0) {
+ ret = is_one_duplicate(type, data, data_size,
+ var_data, var_data_size);
+ if (ret >= 0) {
+ free (var_data);
+ return ret;
+ }
+ var_data = NULL;
+ var_data_size = 0;
+ }
+ }
+
+ for (i = 0; i < SIZE_MAX; i++) {
+ uint8_t *var_data = NULL;
+ size_t var_data_size = 0;
+ if (i == 0) {
+ snprintf(varname, varname_sz, "%s", db_name);
+ } else {
+ snprintf(varname, varname_sz, "%s%zu", db_name, i);
+ }
+
+ ret = efi_get_variable (*vendor, varname,
+ &var_data, &var_data_size,
+ &attributes);
+ if (ret < 0)
+ return 0;
+
+ ret = is_one_duplicate(type, data, data_size,
+ var_data, var_data_size);
+ free (var_data);
+ /*
+ * If ret is < 0, the next one will error as well.
+ * If ret is 0, we need to test the next variable.
+ * If it's 1, that's a real answer.
+ */
+ if (ret < 0)
+ return 0;
+ if (ret > 0)
+ return ret;
+ }
+
+ return 0;
+}
+
static int
is_valid_request (const efi_guid_t *type, void *mok, uint32_t mok_size,
MokRequest req)
--
2.29.2

7
mokutil.spec
View File

@ -1,6 +1,6 @@
Name: mokutil Name: mokutil
Version: 0.4.0 Version: 0.4.0
Release: 3%{?dist} Release: 4%{?dist}
Epoch: 2 Epoch: 2
Summary: Tool to manage UEFI Secure Boot MoK Keys Summary: Tool to manage UEFI Secure Boot MoK Keys
License: GPLv3+ License: GPLv3+
@ -16,6 +16,8 @@ Obsoletes: mokutil < 0.2.0
Patch0001: 0001-Avoid-taking-pointer-to-packed-struct.patch Patch0001: 0001-Avoid-taking-pointer-to-packed-struct.patch
Patch0002: 0002-Fix-a-integer-comparison-sign-issue.patch Patch0002: 0002-Fix-a-integer-comparison-sign-issue.patch
Patch0003: 0003-mokutil-Add-option-to-print-the-UEFI-SBAT-variable-c.patch
Patch0004: 0004-mokutil-add-mok-variables-parsing-support.patch
%description %description
mokutil provides a tool to manage keys for Secure Boot through the MoK mokutil provides a tool to manage keys for Secure Boot through the MoK
@ -50,6 +52,9 @@ make PREFIX=%{_prefix} LIBDIR=%{_libdir} DESTDIR=%{buildroot} install
%{_datadir}/bash-completion/completions/mokutil %{_datadir}/bash-completion/completions/mokutil
%changelog %changelog
* Wed Mar 17 2021 Javier Martinez Canillas <javierm@redhat.com> - 0.4.0-4
- Add SBAT and mok-variables support
* Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 2:0.4.0-3 * Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 2:0.4.0-3
- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild