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dkim=pass header.i=@siemens.com header.s=selector2 header.b=KLO7i8Vr; arc=pass (i=1 spf=pass spfdomain=siemens.com dkim=pass dkdomain=siemens.com dmarc=pass fromdomain=siemens.com); spf=pass (google.com: domain of felix.moessbauer@siemens.com designates 2a01:111:f403:c201::1 as permitted sender) smtp.mailfrom=felix.moessbauer@siemens.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=siemens.com X-Original-From: Felix Moessbauer Reply-To: Felix Moessbauer Precedence: list Mailing-list: list isar-users@googlegroups.com; contact isar-users+owners@googlegroups.com List-ID: X-Spam-Checked-In-Group: isar-users@googlegroups.com X-Google-Group-Id: 914930254986 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Status: No, score=-4.9 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL, RCVD_IN_RP_CERTIFIED,RCVD_IN_RP_RNBL,RCVD_IN_RP_SAFE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on shymkent.ilbers.de X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= Dear isar-users, currently isar requires password-less sudo and an environment where mounting file systems is possible. This has proven problematic for security reasons, both when running in a privileged container or locally. To solve this, we implement fully rootless builds that rely on the unshare syscall which allows us to avoid sudo and instead operate in temporary kernel namespaces as a user that is just privileged within that namespace. This comes with some challenges regarding the handling of mounts (they are cleared when leaving the namespace), as well as cross namespace deployments (the outer user might not be able to access the inner data). For that, we rework the handling of mounts and artifact passing to make it compatible with both chroot modes (schroot and unshare). Note, that this series can be tested on a custom kas-container build provided in [1]. Hints how to migrate downstream layers are provided in the API changelog. Changes since PATCH v1: - fixed broken rebase onto next - fix root_cleandirs implementation NOTE: This requires the kas series (v3) from [1] for rootless building. Changes since RFC 2: - rebased onto next - fix usage of root_cleandirs - simplify file permission handling by mapping caller user to root inside the namespace. By that, in most cases no changes to the imager are needed anymore. - implement support for devshell under rootless - switch to getpass.getuser() to query user (needed for dynamically created / remapped kas builder user) - rework mapping to be more similar to mapping used by mmdebstrap - sbuild: only copy-out of dpkg.log on schroot (unclear if needed on unshare. To be clarified) - imager-sbom: ensure sbom is extracted before entering the chroot Changes since RFC 1: - switch build_type to isar-rootless in isar.yaml (Note: switch back if testing locally in a unprepared kas container) - complete overhaul of the mounting in unshared namespaces - fixes the systemd presetting - fixes hangs when pulling from snapshot mirrors - rename the run_privileged_here to run_privileged_heredoc to clarify its intention - add support for - dpkg-source with do_fetch_common_source - vm images - container images - discoverable disk images - add helper script to clean build dir in unprivileged mode - reduce clutter we leave after finishing a build - fix issues when running in a privileged environment without sub user ids - bugfixes Still missing is the support for the devshell. Further, the rootless build dir must not reside in a git worktree (a normal git dir is fine). This is probably a bug in combination with kas-container. [1] https://groups.google.com/g/kas-devel/c/NWQFCU2aUHg Best regards, Felix Moessbauer Siemens AG Felix Moessbauer (16): refactor bootstrap: store rootfs tar with user permissions deb-dl-dir: export without root privileges download debs without locking introduce wrappers for privileged execution bootstrap: move cleanup trap to function rootfs: rework sstate caching of rootfs artifact rootfs_generate_initramfs: rework deployment to avoid chowning use bitbake function to generate mounting scripts apt-fetcher: prepare for chroot specific fetching add support for fully rootless builds add helper script to clean artifacts in build dir apt-fetcher: implement support for unshare backend dpkg-source: implement multiarch support for unshare backend use copy of sbom-chroot for sbom creation add support for devshell on unshare backend compat: handle user errors gracefully to avoid parser splat Kconfig | 2 +- RECIPE-API-CHANGELOG.md | 42 ++++ doc/user_manual.md | 2 + kas/isar.yaml | 2 +- meta/classes-global/base.bbclass | 124 ++++++++++- meta/classes-recipe/compat.bbclass | 3 + meta/classes-recipe/deb-dl-dir.bbclass | 20 +- meta/classes-recipe/dpkg-base.bbclass | 94 ++++++-- meta/classes-recipe/dpkg-source.bbclass | 40 +++- meta/classes-recipe/dpkg.bbclass | 17 +- .../image-account-extension.bbclass | 4 +- .../image-locales-extension.bbclass | 13 +- .../image-postproc-extension.bbclass | 30 +-- .../image-tools-extension.bbclass | 87 +++++++- meta/classes-recipe/image.bbclass | 21 +- .../imagetypes_container.bbclass | 28 +-- meta/classes-recipe/imagetypes_wic.bbclass | 10 +- meta/classes-recipe/rootfs.bbclass | 202 +++++++++--------- meta/classes-recipe/sbuild.bbclass | 34 ++- meta/classes-recipe/sdk.bbclass | 22 +- meta/classes/sbom.bbclass | 28 ++- meta/conf/bitbake.conf | 7 +- meta/lib/aptsrc_fetcher.py | 87 +++++++- .../isar-mmdebstrap/isar-mmdebstrap.inc | 46 ++-- .../sbom-chroot/sbom-chroot.bb | 11 +- .../sbuild-chroot/sbuild-chroot.inc | 24 ++- scripts/isar-clean-builddir | 73 +++++++ .../unittests/test_image_account_extension.py | 9 +- 28 files changed, 845 insertions(+), 237 deletions(-) create mode 100755 scripts/isar-clean-builddir