Create ConnectCore Security Services .bbclass

This .bbclass allows to generate a .zip file per image, each containing all of
the necessary information to run a CVE scan using the Digi ConnectCore Security
Services' CVE analysis tool.

https://onedigi.atlassian.net/browse/DEL-9632

Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>
(cherry picked from commit fabce3a881454c8a7346538127da5f22862654b6)

meta-digi-dey/classes/ccss.bbclass

@@ -0,0 +1,76 @@
+###########################################################
+#
+# classes/ccss.bbclass - ConnectCore Security Services
+#
+# Generates an SBOM for the CCSS CVE analysis tool
+#
+# Copyright (C) 2025 Digi International
+#
+#
+# This source is released under the MIT License.
+#
+###########################################################
+
+inherit vigiles
+
+CCSS_API_VERSION = "0.1"
+CCSS_IMAGE_TYPE ?= "dev"
+CCSS_ENABLE ?= "0"
+
+python do_ccss_generate_sbom() {
+    import json
+    import os
+    import shutil
+    import tempfile
+
+    # Temporary dir to store all files in the SBOM
+    ccss_tmp_dir = tempfile.mkdtemp(dir=d.getVar('TOPDIR'))
+
+    try:
+        manifest_file = os.path.join(d.getVar('VIGILES_DIR'), d.getVar('VIGILES_MANIFEST_NAME') + d.getVar('VIGILES_MANIFEST_SUFFIX'))
+        ccss_kconfig = os.path.join(d.getVar('VIGILES_DIR'),'.'.join([_get_kernel_pf(d), 'config']))
+        ccss_uconfig = os.path.join(d.getVar('VIGILES_DIR'),'.'.join([_get_uboot_pf(d), 'config']))
+
+        # Copy Vigiles manifest and kernel/uboot configs if they're available
+        if os.path.exists(manifest_file):
+            shutil.copy(manifest_file, os.path.join(ccss_tmp_dir, 'manifest.json'), follow_symlinks=True)
+        if os.path.exists(ccss_kconfig):
+            shutil.copy(ccss_kconfig, os.path.join(ccss_tmp_dir, 'kernel.config'), follow_symlinks=True)
+        if os.path.exists(ccss_uconfig):
+            shutil.copy(ccss_uconfig, os.path.join(ccss_tmp_dir, 'uboot.config'), follow_symlinks=True)
+
+        dict_out = dict(
+                api_version      = d.getVar('CCSS_API_VERSION'),
+                date             = d.getVar('DATETIME'),
+                has_ccss_patches = bb.utils.contains('BBFILE_COLLECTIONS', 'digi-security', 'y', 'n', d),
+                image_type       = d.getVar('CCSS_IMAGE_TYPE'),
+                som              = d.getVar('DIGI_SOM'),
+                yocto_codename   = d.getVar('DISTRO_CODENAME')
+        )
+
+        with open(os.path.join(ccss_tmp_dir, 'config.json'), 'w') as f_out:
+            s = json.dumps(dict_out, indent=2, sort_keys=True)
+            f_out.write(s)
+
+        # Create .zip file
+        shutil.make_archive(os.path.join(d.getVar('TOPDIR'), 'CCSS_' + d.getVar('IMAGE_BASENAME') + '-' + d.getVar('DATETIME')), 'zip', ccss_tmp_dir)
+    finally:
+        # Remove temporary dir
+        bb.utils.remove(ccss_tmp_dir, recurse=True)
+}
+
+# Don't execute do_ccss_generate_sbom() unless explicitly enabled for a given
+# image
+python __anonymous() {
+    if d.getVar('CCSS_ENABLE') != '1':
+        d.setVarFlag('do_ccss_generate_sbom', 'noexec', '1')
+}
+
+addtask do_ccss_generate_sbom after do_image before do_image_complete
+
+# Since do_ccss_generate_sbom() uses the DATETIME variable to create the
+# metadata JSON, said variable will expand to different values when the
+# function is parsed in different stages of the build (first by the bitbake
+# cooker, and then by a worker). This causes metadata/hash mismatch errors due
+# to non-deterministic content, so exclude DATETIME from the hash calculation.
+do_ccss_generate_sbom[vardepsexclude]="DATETIME"