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mokutil/mokutil-bsc1173115-add-ca-and-keyring-checks.patch

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Accepting request 835083 from home:gary_lin:branches:Base:System add options for CA and kernel keyring checks (bsc#1173115) OBS-URL: https://build.opensuse.org/request/show/835083 OBS-URL: https://build.opensuse.org/package/show/Base:System/mokutil?expand=0&rev=45
2020-09-17 08:11:04 +02:00
From edbb90e7b9dddcb6561af244a65d10d6a22e6bae Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Thu, 27 Aug 2020 11:31:08 +0800
Subject: [PATCH 01/13] efi_x509: add the function to check immediate CA
Add a new function, is_immediate_ca(), to check whether the given CA
cert is the immediate CA of the cert.
Signed-off-by: Gary Lin <glin@suse.com>
(cherry picked from commit 643bb8dacb221979354dab814fc2d41e94a02d67)
---
src/mokutil.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 73 insertions(+)
diff --git a/src/mokutil.c b/src/mokutil.c
index e2d567d..3735167 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -1032,6 +1032,79 @@ is_valid_cert (void *cert, uint32_t cert_size)
return 1;
}
+/**
+ * Check whether the given CA cert is the immediate CA of the given cert
+ **/
+static int
+is_immediate_ca (const uint8_t *cert, const uint32_t cert_size,
+ const uint8_t *ca_cert, const uint32_t ca_cert_size)
+{
+ X509 *X509cert = NULL;
+ X509 *X509ca = NULL;
+ X509_STORE *cert_store = NULL;
+ X509_STORE_CTX *cert_ctx = NULL;
+ int ret = 0;
+
+ if (cert == NULL || ca_cert == NULL)
+ return 0;
+
+ if (EVP_add_digest (EVP_md5 ()) == 0)
+ return 0;
+ if (EVP_add_digest (EVP_sha1 ()) == 0)
+ return 0;
+ if (EVP_add_digest (EVP_sha256 ()) == 0)
+ return 0;
+
+ X509cert = d2i_X509 (NULL, &cert, cert_size);
+ if (X509cert == NULL)
+ return 0;
+
+ X509ca = d2i_X509 (NULL, &ca_cert, ca_cert_size);
+ if (X509ca == NULL)
+ return 0;
+
+ cert_store = X509_STORE_new ();
+ if (cert_store == NULL)
+ goto err;
+
+ if (X509_STORE_add_cert (cert_store, X509ca) == 0)
+ goto err;
+
+ /* Follow edk2 CryptoPkg to allow partial certificate chains and
+ * disable time checks */
+ X509_STORE_set_flags (cert_store,
+ X509_V_FLAG_PARTIAL_CHAIN | X509_V_FLAG_NO_CHECK_TIME);
+
+ cert_ctx = X509_STORE_CTX_new ();
+ if (cert_ctx == NULL)
+ goto err;
+
+ if (X509_STORE_CTX_init (cert_ctx, cert_store, X509cert, NULL) == 0)
+ goto err;
+
+ /* Verify the cert */
+ ret = X509_verify_cert (cert_ctx);
+ /* Treat the exceptional error as FALSE */
+ if (ret < 0)
+ ret = 0;
+ X509_STORE_CTX_cleanup (cert_ctx);
+
+err:
+ if (X509cert)
+ X509_free (X509cert);
+
+ if (X509ca)
+ X509_free (X509ca);
+
+ if (cert_store)
+ X509_STORE_free (cert_store);
+
+ if (cert_store)
+ X509_STORE_CTX_free (cert_ctx);
+
+ 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)
--
2.28.0
From db7216b3a758ba62f02154b79a77c878fd0fd85e Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Thu, 27 Aug 2020 14:11:56 +0800
Subject: [PATCH 02/13] mokutil: do the CA check
Check whether th CA cert is already enrolled in the key database before
enrolling the key.
The check can be disabled with "--ignore-ca-check".
Signed-off-by: Gary Lin <glin@suse.com>
(cherry picked from commit ff20a53a111fe3e027da7250175b7ef09ce3b1da)
---
src/mokutil.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 88 insertions(+)
diff --git a/src/mokutil.c b/src/mokutil.c
index 3735167..4ac6619 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -95,6 +95,7 @@ typedef uint8_t efi_bool_t;
typedef wchar_t efi_char16_t; /* UNICODE character */
static int use_simple_hash;
+static int force_ca_check;
typedef enum {
DELETE_MOK = 0,
@@ -182,6 +183,7 @@ print_help ()
printf (" --root-pw\t\t\t\tUse the root password\n");
printf (" --simple-hash\t\t\t\tUse the old password hash method\n");
printf (" --mokx\t\t\t\tManipulate the MOK blacklist\n");
+ printf (" --ignore-ca-check\t\t\tDon't check CA of the given certificate\n");
}
static int
@@ -1237,6 +1239,70 @@ in_pending_request (const efi_guid_t *type, void *data, uint32_t data_size,
return ret;
}
+static int
+is_ca_in_db (const void *cert, const uint32_t cert_size,
+ const efi_guid_t *vendor, const char *db_name)
+{
+ uint8_t *var_data;
+ size_t var_data_size;
+ uint32_t attributes;
+ uint32_t node_num;
+ MokListNode *list;
+ int ret = 0;
+
+ if (!cert || cert_size == 0 || !vendor || !db_name)
+ return 0;
+
+ ret = efi_get_variable (*vendor, db_name, &var_data, &var_data_size,
+ &attributes);
+ if (ret < 0)
+ return 0;
+
+ list = build_mok_list (var_data, var_data_size, &node_num);
+ if (list == NULL) {
+ goto done;
+ }
+
+ for (unsigned int i = 0; i < node_num; i++) {
+ efi_guid_t sigtype = list[i].header->SignatureType;
+ if (efi_guid_cmp (&sigtype, &efi_guid_x509_cert) != 0)
+ continue;
+
+ if (is_immediate_ca (cert, cert_size, list[i].mok,
+ list[i].mok_size)) {
+ ret = 1;
+ break;
+ }
+ }
+
+done:
+ if (list)
+ free (list);
+ free (var_data);
+
+ return ret;
+}
+
+/* Check whether the CA cert is already enrolled */
+static int
+is_ca_enrolled (void *mok, uint32_t mok_size, MokRequest req)
+{
+ switch (req) {
+ case ENROLL_MOK:
+ if (is_ca_in_db (mok, mok_size, &efi_guid_shim, "MokListRT"))
+ return 1;
+ break;
+ case ENROLL_BLACKLIST:
+ if (is_ca_in_db (mok, mok_size, &efi_guid_shim, "MokListXRT"))
+ return 1;
+ break;
+ default:
+ return 0;
+ }
+
+ return 0;
+}
+
static void
print_skip_message (const char *filename, void *mok, uint32_t mok_size,
MokRequest req)
@@ -1394,6 +1460,13 @@ issue_mok_request (char **files, uint32_t total, MokRequest req,
goto error;
}
+ /* Check whether CA is already enrolled */
+ if (force_ca_check && is_ca_enrolled (ptr, sizes[i], req)) {
+ fprintf (stderr, "CA of %s is already enrolled\n",
+ files[i]);
+ goto error;
+ }
+
if (is_valid_request (&efi_guid_x509_cert, ptr, sizes[i], req)) {
ptr += sizes[i];
real_size += sizes[i] + sizeof(EFI_SIGNATURE_LIST) + sizeof(efi_guid_t);
@@ -2041,6 +2114,17 @@ test_key (MokRequest req, const char *key_file)
goto error;
}
+ if (!is_valid_cert (key, read_size)) {
+ fprintf (stderr, "Not a valid x509 certificate\n");
+ goto error;
+ }
+
+ if (force_ca_check && is_ca_enrolled (key, read_size, req)) {
+ fprintf (stderr, "CA of %s is already enrolled\n",
+ key_file);
+ goto error;
+ }
+
if (is_valid_request (&efi_guid_x509_cert, key, read_size, req)) {
printf ("%s is not enrolled\n", key_file);
ret = 0;
@@ -2215,6 +2299,7 @@ main (int argc, char *argv[])
int ret = -1;
use_simple_hash = 0;
+ force_ca_check = 1;
if (!efi_variables_supported ()) {
fprintf (stderr, "EFI variables are not supported on this system\n");
@@ -2255,6 +2340,7 @@ main (int argc, char *argv[])
{"db", no_argument, 0, 0 },
{"dbx", no_argument, 0, 0 },
{"timeout", required_argument, 0, 0 },
+ {"ignore-ca-check", no_argument, 0, 0 },
{0, 0, 0, 0}
};
@@ -2341,6 +2427,8 @@ main (int argc, char *argv[])
} else if (strcmp (option, "timeout") == 0) {
command |= TIMEOUT;
timeout = strdup (optarg);
+ } else if (strcmp (option, "ignore-ca-check") == 0) {
+ force_ca_check = 0;
}
break;
--
2.28.0
From 3bfcf1db9ab1ff2bd4a2ddd2649c03337f823a2d Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Thu, 27 Aug 2020 14:18:29 +0800
Subject: [PATCH 03/13] mokutil: close file in the error path
We should close the file descriptor when encountering an error in
issue_mok_request();
Signed-off-by: Gary Lin <glin@suse.com>
(cherry picked from commit 0a0813d6f7dfa73f7947566e7fad2d42e016f30a)
---
src/mokutil.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/mokutil.c b/src/mokutil.c
index 4ac6619..760b54a 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -1452,11 +1452,13 @@ issue_mok_request (char **files, uint32_t total, MokRequest req,
read_size = read (fd, ptr, sizes[i]);
if (read_size < 0 || read_size != (int64_t)sizes[i]) {
fprintf (stderr, "Failed to read %s\n", files[i]);
+ close (fd);
goto error;
}
if (!is_valid_cert (ptr, read_size)) {
fprintf (stderr, "Abort!!! %s is not a valid x509 certificate in DER format\n",
files[i]);
+ close (fd);
goto error;
}
@@ -1464,6 +1466,7 @@ issue_mok_request (char **files, uint32_t total, MokRequest req,
if (force_ca_check && is_ca_enrolled (ptr, sizes[i], req)) {
fprintf (stderr, "CA of %s is already enrolled\n",
files[i]);
+ close (fd);
goto error;
}
--
2.28.0
From 77be7a26815233e798f6ab61cbbd8a1cd4a89817 Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Thu, 27 Aug 2020 14:22:52 +0800
Subject: [PATCH 04/13] make CA check non-fatal
(cherry picked from commit 50098834780ee6d5dd0cfd3073d504030cc25037)
---
src/mokutil.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/src/mokutil.c b/src/mokutil.c
index 760b54a..f4f21f8 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -1464,10 +1464,9 @@ issue_mok_request (char **files, uint32_t total, MokRequest req,
/* Check whether CA is already enrolled */
if (force_ca_check && is_ca_enrolled (ptr, sizes[i], req)) {
- fprintf (stderr, "CA of %s is already enrolled\n",
- files[i]);
+ printf ("CA enrolled. Skip %s\n", files[i]);
close (fd);
- goto error;
+ continue;
}
if (is_valid_request (&efi_guid_x509_cert, ptr, sizes[i], req)) {
--
2.28.0
From e4a28a587f39912c65e3f74f0ff9766158ef9dff Mon Sep 17 00:00:00 2001
From: Sandy <39258624+sandy-lcq@users.noreply.github.com>
Date: Fri, 13 Dec 2019 10:38:28 +0800
Subject: [PATCH 05/13] mokutil.c: fix typo enrollement -> enrollment
Signed-off-by: Changqing Li <changqing.li@windriver.com>
(cherry picked from commit e37eeef4866f5f3bbeaef3fe1d1360ebac76bdc5)
---
src/mokutil.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/mokutil.c b/src/mokutil.c
index f4f21f8..ee95e20 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -1323,7 +1323,7 @@ print_skip_message (const char *filename, void *mok, uint32_t mok_size,
printf ("SKIP: %s is already enrolled\n", filename);
else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_shim, "MokNew"))
- printf ("SKIP: %s is already in the enrollement request\n", filename);
+ printf ("SKIP: %s is already in the enrollment request\n", filename);
break;
case DELETE_MOK:
if (!is_duplicate (&efi_guid_x509_cert, mok, mok_size,
--
2.28.0
From f18969c91a44fee03a1ab8da336973f36ef7e5e9 Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Fri, 28 Aug 2020 11:53:24 +0800
Subject: [PATCH 06/13] mokutil: check the blocklists before enrolling a key
Check "dbx" and "MokListXRT" when enrolling a key.
Signed-off-by: Gary Lin <glin@suse.com>
(cherry picked from commit 8de04a4dd566376316432bd60c3b0ab2686797a4)
---
src/mokutil.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/src/mokutil.c b/src/mokutil.c
index ee95e20..834228a 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -1173,6 +1173,10 @@ is_valid_request (const efi_guid_t *type, void *mok, uint32_t mok_size,
is_duplicate (type, mok, mok_size, &efi_guid_shim, "MokNew")) {
return 0;
}
+ /* Also check the blocklists */
+ if (is_duplicate (type, mok, mok_size, &efi_guid_security, "dbx") ||
+ is_duplicate (type, mok, mok_size, &efi_guid_shim, "MokListXRT"))
+ return 0;
break;
case DELETE_MOK:
if (!is_duplicate (type, mok, mok_size, &efi_guid_shim, "MokListRT") ||
@@ -1303,6 +1307,23 @@ is_ca_enrolled (void *mok, uint32_t mok_size, MokRequest req)
return 0;
}
+/* Check whether the CA cert is blocked */
+static int
+is_ca_blocked (void *mok, uint32_t mok_size, MokRequest req)
+{
+ switch (req) {
+ case ENROLL_MOK:
+ if (is_ca_in_db (mok, mok_size, &efi_guid_security, "dbx") ||
+ is_ca_in_db (mok, mok_size, &efi_guid_shim, "MokListXRT"))
+ return 1;
+ break;
+ default:
+ return 0;
+ }
+
+ return 0;
+}
+
static void
print_skip_message (const char *filename, void *mok, uint32_t mok_size,
MokRequest req)
@@ -1324,6 +1345,12 @@ print_skip_message (const char *filename, void *mok, uint32_t mok_size,
else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_shim, "MokNew"))
printf ("SKIP: %s is already in the enrollment request\n", filename);
+ else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
+ &efi_guid_security, "dbx"))
+ printf ("SKIP: %s is blocked in dbx\n", filename);
+ else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
+ &efi_guid_shim, "MokListXRT"))
+ printf ("SKIP: %s is blocked in MokListXRT\n", filename);
break;
case DELETE_MOK:
if (!is_duplicate (&efi_guid_x509_cert, mok, mok_size,
@@ -1469,6 +1496,13 @@ issue_mok_request (char **files, uint32_t total, MokRequest req,
continue;
}
+ /* Check whether CA is blocked */
+ if (force_ca_check && is_ca_blocked (ptr, sizes[i], req)) {
+ printf ("CA blocked. Skip %s\n", files[i]);
+ close (fd);
+ continue;
+ }
+
if (is_valid_request (&efi_guid_x509_cert, ptr, sizes[i], req)) {
ptr += sizes[i];
real_size += sizes[i] + sizeof(EFI_SIGNATURE_LIST) + sizeof(efi_guid_t);
@@ -2127,6 +2161,12 @@ test_key (MokRequest req, const char *key_file)
goto error;
}
+ if (force_ca_check && is_ca_blocked (key, read_size, req)) {
+ fprintf (stderr, "CA of %s is blocked\n",
+ key_file);
+ goto error;
+ }
+
if (is_valid_request (&efi_guid_x509_cert, key, read_size, req)) {
printf ("%s is not enrolled\n", key_file);
ret = 0;
--
2.28.0
From 057f96e6842af030b1f68a609019043f0f853708 Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Fri, 28 Aug 2020 11:58:12 +0800
Subject: [PATCH 07/13] mokutil: improve the message from "--test-key"
Print the details of the test result.
Signed-off-by: Gary Lin <glin@suse.com>
(cherry picked from commit 5ede0bd0d68d27afc6d3d06556d0077e2840502b)
---
src/mokutil.c | 29 +++++++++++++++--------------
1 file changed, 15 insertions(+), 14 deletions(-)
diff --git a/src/mokutil.c b/src/mokutil.c
index 834228a..e8b48fe 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -1332,49 +1332,49 @@ print_skip_message (const char *filename, void *mok, uint32_t mok_size,
case ENROLL_MOK:
if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_global, "PK"))
- printf ("SKIP: %s is already in PK\n", filename);
+ printf ("%s is already in PK\n", filename);
else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_global, "KEK"))
- printf ("SKIP: %s is already in KEK\n", filename);
+ printf ("%s is already in KEK\n", filename);
else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_security, "db"))
- printf ("SKIP: %s is already in db\n", filename);
+ printf ("%s is already in db\n", filename);
else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_shim, "MokListRT"))
- printf ("SKIP: %s is already enrolled\n", filename);
+ printf ("%s is already enrolled\n", filename);
else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_shim, "MokNew"))
- printf ("SKIP: %s is already in the enrollment request\n", filename);
+ printf ("%s is already in the enrollment request\n", filename);
else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_security, "dbx"))
- printf ("SKIP: %s is blocked in dbx\n", filename);
+ printf ("%s is blocked in dbx\n", filename);
else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_shim, "MokListXRT"))
- printf ("SKIP: %s is blocked in MokListXRT\n", filename);
+ printf ("%s is blocked in MokListXRT\n", filename);
break;
case DELETE_MOK:
if (!is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_shim, "MokListRT"))
- printf ("SKIP: %s is not in MokList\n", filename);
+ printf ("%s is not in MokList\n", filename);
else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_shim, "MokDel"))
- printf ("SKIP: %s is already in the deletion request\n", filename);
+ printf ("%s is already in the deletion request\n", filename);
break;
case ENROLL_BLACKLIST:
if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_shim, "MokListXRT"))
- printf ("SKIP: %s is already in MokListX\n", filename);
+ printf ("%s is already in MokListX\n", filename);
else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_shim, "MokXNew"))
- printf ("SKIP: %s is already in the MokX enrollment request\n", filename);
+ printf ("%s is already in the MokX enrollment request\n", filename);
break;
case DELETE_BLACKLIST:
if (!is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_shim, "MokListXRT"))
- printf ("SKIP: %s is not in MokListX\n", filename);
+ printf ("%s is not in MokListX\n", filename);
else if (is_duplicate (&efi_guid_x509_cert, mok, mok_size,
&efi_guid_shim, "MokXDel"))
- printf ("SKIP: %s is already in the MokX deletion request\n", filename);
+ printf ("%s is already in the MokX deletion request\n", filename);
break;
}
}
@@ -1511,6 +1511,7 @@ issue_mok_request (char **files, uint32_t total, MokRequest req,
reverse_req_names[req]);
ptr -= sizeof(EFI_SIGNATURE_LIST) + sizeof(efi_guid_t);
} else {
+ printf ("SKIP: ");
print_skip_message (files[i], ptr, sizes[i], req);
ptr -= sizeof(EFI_SIGNATURE_LIST) + sizeof(efi_guid_t);
}
@@ -2171,7 +2172,7 @@ test_key (MokRequest req, const char *key_file)
printf ("%s is not enrolled\n", key_file);
ret = 0;
} else {
- printf ("%s is already enrolled\n", key_file);
+ print_skip_message (key_file, key, read_size, req);
ret = 1;
}
--
2.28.0
From 7e5d2cb51a8360ad461e1031b9b3280e72d6338c Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Wed, 2 Sep 2020 16:09:04 +0800
Subject: [PATCH 08/13] mokutil: disable CA check by default
The SUSE PTF certificate is also issued by SUSE CA, so enabling CA check
by default would ignore the enrollment of the PTF certificates and the
PTF would be unloadable.
Flip "--ignore-ca-check" to "--ca-check" and set force_ca_check to 0 by
default.
Signed-off-by: Gary Lin <glin@suse.com>
(cherry picked from commit 235e92a1d3e0f32f7be44aa0f37d7f3041306ccc)
---
src/mokutil.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/src/mokutil.c b/src/mokutil.c
index e8b48fe..b04deb3 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -183,7 +183,7 @@ print_help ()
printf (" --root-pw\t\t\t\tUse the root password\n");
printf (" --simple-hash\t\t\t\tUse the old password hash method\n");
printf (" --mokx\t\t\t\tManipulate the MOK blacklist\n");
- printf (" --ignore-ca-check\t\t\tDon't check CA of the given certificate\n");
+ printf (" --ca-check\t\t\t\tCheck if CA of the key is enrolled/blocked\n");
}
static int
@@ -2342,7 +2342,7 @@ main (int argc, char *argv[])
int ret = -1;
use_simple_hash = 0;
- force_ca_check = 1;
+ force_ca_check = 0;
if (!efi_variables_supported ()) {
fprintf (stderr, "EFI variables are not supported on this system\n");
@@ -2383,7 +2383,7 @@ main (int argc, char *argv[])
{"db", no_argument, 0, 0 },
{"dbx", no_argument, 0, 0 },
{"timeout", required_argument, 0, 0 },
- {"ignore-ca-check", no_argument, 0, 0 },
+ {"ca-check", no_argument, 0, 0 },
{0, 0, 0, 0}
};
@@ -2470,8 +2470,8 @@ main (int argc, char *argv[])
} else if (strcmp (option, "timeout") == 0) {
command |= TIMEOUT;
timeout = strdup (optarg);
- } else if (strcmp (option, "ignore-ca-check") == 0) {
- force_ca_check = 0;
+ } else if (strcmp (option, "ca-check") == 0) {
+ force_ca_check = 1;
}
break;
--
2.28.0
From 8fee022cb2df7357bbc92c2c337af7b0057f1f23 Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Wed, 2 Sep 2020 16:19:44 +0800
Subject: [PATCH 09/13] man: add "--ca-check" to the man page
Signed-off-by: Gary Lin <glin@suse.com>
(cherry picked from commit ae0aaf1a62faaba16183ed01a7ac9406535d96a1)
---
man/mokutil.1 | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/man/mokutil.1 b/man/mokutil.1
index 25fe8b4..cb37484 100644
--- a/man/mokutil.1
+++ b/man/mokutil.1
@@ -15,7 +15,7 @@ mokutil \- utility to manipulate machine owner keys
.br
\fBmokutil\fR [--import \fIkeylist\fR| -i \fIkeylist\fR]
([--hash-file \fIhashfile\fR | -f \fIhashfile\fR] | [--root-pw | -P] |
- [--simple-hash | -s] | [--mokx | -X])
+ [--simple-hash | -s] | [--mokx | -X] | [--ca-check])
.br
\fBmokutil\fR [--delete \fIkeylist\fR | -d \fIkeylist\fR]
([--hash-file \fIhashfile\fR | -f \fIhashfile\fR] | [--root-pw | -P] |
@@ -43,7 +43,7 @@ mokutil \- utility to manipulate machine owner keys
\fBmokutil\fR [--sb-state]
.br
\fBmokutil\fR [--test-key \fIkeyfile\fR | -t \fIkeyfile\fR]
- ([--mokx | -X])
+ ([--mokx | -X] | [--ca-check])
.br
\fBmokutil\fR [--reset]
([--hash-file \fIhashfile\fR | -f \fIhashfile\fR] | [--root-pw | -P] |
@@ -173,3 +173,7 @@ 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--ca-check\fR
+Check if the CA of the given key is already enrolled or blocked in the key
+databases.
+.TP
--
2.28.0
From cbada2d9ac9bfc36528a51dc9fcf136eb8290473 Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Wed, 16 Sep 2020 11:59:02 +0800
Subject: [PATCH 10/13] keyring: add the function to check kernel keyring
Add match_skid_in_trusted_keyring() to check if the given SKID is in the
kernel trusted keys keyring.
Signed-off-by: Gary Lin <glin@suse.com>
(cherry picked from commit 9e5c6fd4fbdce386ecd2482a27f8a29e5d0c7eff)
---
configure.ac | 1 +
src/Makefile.am | 4 ++
src/keyring.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++++
src/keyring.h | 37 ++++++++++++++++
4 files changed, 153 insertions(+)
create mode 100644 src/keyring.c
create mode 100644 src/keyring.h
diff --git a/configure.ac b/configure.ac
index d74fd21..b0b0376 100644
--- a/configure.ac
+++ b/configure.ac
@@ -85,6 +85,7 @@ AC_CHECK_FUNCS([memset])
PKG_CHECK_MODULES(OPENSSL, [openssl >= 0.9.8])
PKG_CHECK_MODULES(EFIVAR, [efivar >= 0.12])
+PKG_CHECK_MODULES(LIBKEYUTILS, [libkeyutils >= 1.5])
AC_ARG_WITH([bash-completion-dir],
AS_HELP_STRING([--with-bash-completion-dir[=PATH]],
diff --git a/src/Makefile.am b/src/Makefile.am
index 87b1515..f616b90 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,13 +2,17 @@ bin_PROGRAMS = mokutil
mokutil_CFLAGS = $(OPENSSL_CFLAGS) \
$(EFIVAR_CFLAGS) \
+ $(LIBKEYUTILS_CFLAGS) \
$(WARNINGFLAGS_C)
mokutil_LDADD = $(OPENSSL_LIBS) \
$(EFIVAR_LIBS) \
+ $(LIBKEYUTILS_LIBS) \
-lcrypt
mokutil_SOURCES = signature.h \
+ keyring.h \
+ keyring.c \
password-crypt.h \
password-crypt.c \
mokutil.c
diff --git a/src/keyring.c b/src/keyring.c
new file mode 100644
index 0000000..9709efd
--- /dev/null
+++ b/src/keyring.c
@@ -0,0 +1,111 @@
+/**
+ * Copyright (C) 2020 Gary Lin <glin@suse.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ *
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL. If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so. If you
+ * do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+
+#include <keyutils.h>
+
+#include "keyring.h"
+
+/**
+ * Match the x509v3 Subject Key ID in the descriptions of the kernel built-in
+ * trusted keys keyring
+ *
+ * return value
+ * - 0 : not matched
+ * - 1 : matched
+ * - -1 : error
+ */
+int
+match_skid_in_trusted_keyring (const char *skid)
+{
+ key_serial_t ring_id, key_id, *key_ptr;
+ void *keylist = NULL;
+ int count;
+ char buffer[1024];
+ char *ptr;
+ long buf_size;
+ int ret = -1;
+
+ if (skid == NULL)
+ return -1;
+
+ /* Find the keyring ID of the kernel trusted keys */
+ ring_id = find_key_by_type_and_desc("keyring", ".builtin_trusted_keys", 0);
+ if (ring_id < 0) {
+ fprintf(stderr, "Failed to accesss kernel trusted keyring: %m\n");
+ goto out;
+ }
+
+ count = keyctl_read_alloc(ring_id, &keylist);
+ if (count < 0) {
+ fprintf(stderr, "Failed to read kernel trusted keyring\n");
+ goto out;
+ }
+
+ count /= sizeof(key_serial_t);
+ if (count == 0) {
+ /* The keyring is empty */
+ ret = 0;
+ goto out;
+ }
+
+ /* Iterate the keylist and match SKID */
+ key_ptr = keylist;
+ do {
+ key_id = *key_ptr++;
+
+ buf_size = keyctl_describe(key_id, buffer, sizeof(buffer));
+ if (buf_size < 0) {
+ fprintf(stderr, "key %X inaccessible %m\n", key_id);
+ goto out;
+ }
+
+ /* Check if SKID is in the description */
+ ptr = strstr(buffer, skid);
+ if (ptr && *(ptr + strlen(skid)) == '\0') {
+ /* Matched */
+ ret = 1;
+ goto out;
+ }
+ } while (--count);
+
+ ret = 0;
+out:
+ if (keylist)
+ free(keylist);
+
+ return ret;
+
+}
diff --git a/src/keyring.h b/src/keyring.h
new file mode 100644
index 0000000..44127cf
--- /dev/null
+++ b/src/keyring.h
@@ -0,0 +1,37 @@
+/**
+ * Copyright (C) 2020 Gary Lin <glin@suse.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ *
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL. If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so. If you
+ * do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+
+#ifndef __KEYRING_H__
+#define __KEYRING_H__
+
+int match_skid_in_trusted_keyring (const char *skid);
+
+#endif /* __KEYRING_H__ */
--
2.28.0
From 8fc0f7bb5b9826fd3af99836a7e39fed607d3646 Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Wed, 16 Sep 2020 12:00:18 +0800
Subject: [PATCH 11/13] efi_x509: add the function to fetch SKID
Add get_cert_skid() to fetch SKID of a given certiticate.
Signed-off-by: Gary Lin <glin@suse.com>
(cherry picked from commit 7a7a85ba5f057c0c155787d695561a051b6b5eb4)
---
src/mokutil.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)
diff --git a/src/mokutil.c b/src/mokutil.c
index b04deb3..e4e405e 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -47,6 +47,7 @@
#include <openssl/sha.h>
#include <openssl/x509.h>
+#include <openssl/x509v3.h>
#include <crypt.h>
#include <efivar.h>
@@ -1034,6 +1035,62 @@ is_valid_cert (void *cert, uint32_t cert_size)
return 1;
}
+/**
+ * Get the Subject Key Identifier of the given certificate
+ *
+ * This function allocates the SKID string and the caller is responsible to
+ * free the string.
+ *
+ * Return value:
+ * - 0 : Success
+ * - -1 : Error
+ */
+static int
+get_cert_skid(const uint8_t *cert, const uint32_t cert_size, char **skid)
+{
+ X509 *X509cert;
+ const ASN1_OCTET_STRING *asn1_id;
+ const uint8_t *data;
+ int data_len, i;
+ char *id_str, *ptr;
+ int ret = -1;
+
+ X509cert = d2i_X509 (NULL, &cert, cert_size);
+ if (X509cert == NULL) {
+ fprintf (stderr, "invalid x509 certificate\n");
+ goto out;
+ }
+
+ asn1_id = X509_get0_subject_key_id (X509cert);
+ if (asn1_id == NULL) {
+ fprintf (stderr, "Failed to get Subject Key ID\n");
+ goto out;
+ }
+
+ data = ASN1_STRING_get0_data (asn1_id);
+ data_len = ASN1_STRING_length (asn1_id);
+
+ id_str = malloc (data_len*2 + 1);
+ if (id_str == NULL) {
+ fprintf (stderr, "Failed to allocated id string\n");
+ goto out;
+ }
+
+ ptr = id_str;
+ for (i = 0; i < data_len; i++) {
+ snprintf (ptr, 3, "%02x", data[i]);
+ ptr += 2;
+ }
+
+ *skid = id_str;
+ ret = 0;
+out:
+ if (X509cert)
+ X509_free (X509cert);
+
+ return ret;
+}
+
/**
* Check whether the given CA cert is the immediate CA of the given cert
**/
--
2.28.0
From 8f8ee97cd068eaeabe6897314f63bc4a5606b97c Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Wed, 16 Sep 2020 12:03:33 +0800
Subject: [PATCH 12/13] mokutil: check the kernel trusted keyring by default
When enrolling a new key, mokutil now checks whether the key is one of
the kernel built-in trusted keys.
The kernel keyring check can be disabled by "--ignore-keyring".
Signed-off-by: Gary Lin <glin@suse.com>
(cherry picked from commit 8bac3f53e2c4600f0843234e1b525a816f255955)
---
src/mokutil.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/src/mokutil.c b/src/mokutil.c
index e4e405e..02ed21f 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -53,6 +53,7 @@
#include <efivar.h>
#include "signature.h"
+#include "keyring.h"
#include "password-crypt.h"
#define PASSWORD_MAX 256
@@ -97,6 +98,7 @@ typedef wchar_t efi_char16_t; /* UNICODE character */
static int use_simple_hash;
static int force_ca_check;
+static int check_keyring;
typedef enum {
DELETE_MOK = 0,
@@ -185,6 +187,7 @@ print_help ()
printf (" --simple-hash\t\t\t\tUse the old password hash method\n");
printf (" --mokx\t\t\t\tManipulate the MOK blacklist\n");
printf (" --ca-check\t\t\t\tCheck if CA of the key is enrolled/blocked\n");
+ printf (" --ignore-keyring\t\t\tDon't check if the key is the kernel keyring\n");
}
static int
@@ -1381,6 +1384,25 @@ is_ca_blocked (void *mok, uint32_t mok_size, MokRequest req)
return 0;
}
+/* Check whether the key is already in the kernel trusted keyring */
+static int
+is_in_trusted_keyring (const void *cert, const uint32_t cert_size)
+{
+ char *skid = NULL;
+ int ret;
+
+ if (get_cert_skid (cert, cert_size, &skid) < 0)
+ return 0;
+
+ ret = match_skid_in_trusted_keyring (skid);
+ if (ret < 0)
+ ret = 0;
+
+ free (skid);
+
+ return ret;
+}
+
static void
print_skip_message (const char *filename, void *mok, uint32_t mok_size,
MokRequest req)
@@ -1546,6 +1568,15 @@ issue_mok_request (char **files, uint32_t total, MokRequest req,
goto error;
}
+ /* Check whether the key is already in the trusted keyring */
+ if (req == ENROLL_MOK && check_keyring &&
+ is_in_trusted_keyring (ptr, sizes[i])) {
+ printf ("Already in kernel trusted keyring. Skip %s\n",
+ files[i]);
+ close (fd);
+ continue;
+ }
+
/* Check whether CA is already enrolled */
if (force_ca_check && is_ca_enrolled (ptr, sizes[i], req)) {
printf ("CA enrolled. Skip %s\n", files[i]);
@@ -2213,6 +2244,12 @@ test_key (MokRequest req, const char *key_file)
goto error;
}
+ if (check_keyring && is_in_trusted_keyring (key, read_size)) {
+ fprintf (stderr, "%s is already in the built-in trusted keyring\n",
+ key_file);
+ goto error;
+ }
+
if (force_ca_check && is_ca_enrolled (key, read_size, req)) {
fprintf (stderr, "CA of %s is already enrolled\n",
key_file);
@@ -2400,6 +2437,7 @@ main (int argc, char *argv[])
use_simple_hash = 0;
force_ca_check = 0;
+ check_keyring = 1;
if (!efi_variables_supported ()) {
fprintf (stderr, "EFI variables are not supported on this system\n");
@@ -2441,6 +2479,7 @@ main (int argc, char *argv[])
{"dbx", no_argument, 0, 0 },
{"timeout", required_argument, 0, 0 },
{"ca-check", no_argument, 0, 0 },
+ {"ignore-keyring", no_argument, 0, 0 },
{0, 0, 0, 0}
};
@@ -2529,6 +2568,8 @@ main (int argc, char *argv[])
timeout = strdup (optarg);
} else if (strcmp (option, "ca-check") == 0) {
force_ca_check = 1;
+ } else if (strcmp (option, "ignore-keyring") == 0) {
+ check_keyring = 0;
}
break;
--
2.28.0
From 4a1e8c43ada0896ed169826ae9cfc7c83d4d7f27 Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Wed, 16 Sep 2020 16:10:29 +0800
Subject: [PATCH 13/13] man: add "--ignore-keyring"
Signed-off-by: Gary Lin <glin@suse.com>
(cherry picked from commit c24deaa37d72f8aa06cf22d35c91b218d1a3d99e)
---
man/mokutil.1 | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/man/mokutil.1 b/man/mokutil.1
index cb37484..cbea367 100644
--- a/man/mokutil.1
+++ b/man/mokutil.1
@@ -15,7 +15,7 @@ mokutil \- utility to manipulate machine owner keys
.br
\fBmokutil\fR [--import \fIkeylist\fR| -i \fIkeylist\fR]
([--hash-file \fIhashfile\fR | -f \fIhashfile\fR] | [--root-pw | -P] |
- [--simple-hash | -s] | [--mokx | -X] | [--ca-check])
+ [--simple-hash | -s] | [--mokx | -X] | [--ca-check] | [--ignore-keyring])
.br
\fBmokutil\fR [--delete \fIkeylist\fR | -d \fIkeylist\fR]
([--hash-file \fIhashfile\fR | -f \fIhashfile\fR] | [--root-pw | -P] |
@@ -43,7 +43,7 @@ mokutil \- utility to manipulate machine owner keys
\fBmokutil\fR [--sb-state]
.br
\fBmokutil\fR [--test-key \fIkeyfile\fR | -t \fIkeyfile\fR]
- ([--mokx | -X] | [--ca-check])
+ ([--mokx | -X] | [--ca-check] | [--ignore-keyring])
.br
\fBmokutil\fR [--reset]
([--hash-file \fIhashfile\fR | -f \fIhashfile\fR] | [--root-pw | -P] |
@@ -177,3 +177,6 @@ List the keys in the secure boot blacklist signature store (dbx)
Check if the CA of the given key is already enrolled or blocked in the key
databases.
.TP
+\fB--ignore-keyring\fR
+Ignore the kernel builtin trusted keys keyring check when enrolling a key into MokList
+.TP
--
2.28.0
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