This patch set introduces an ability to delegate a subset of BPF subsystem functionality from privileged system-wide daemon (e.g., systemd or any other container manager) through special mount options for userns-bound BPF FS to a *trusted* unprivileged application. Trust is the key here. This functionality is not about allowing unconditional unprivileged BPF usage. Establishing trust, though, is completely up to the discretion of respective privileged application that would create and mount a BPF FS instance with delegation enabled, as different production setups can and do achieve it through a combination of different means (signing, LSM, code reviews, etc), and it's undesirable and infeasible for kernel to enforce any particular way of validating trustworthiness of particular process. The main motivation for this work is a desire to enable containerized BPF applications to be used together with user namespaces. This is currently impossible, as CAP_BPF, required for BPF subsystem usage, cannot be namespaced or sandboxed, as a general rule. E.g., tracing BPF programs, thanks to BPF helpers like bpf_probe_read_kernel() and bpf_probe_read_user() can safely read arbitrary memory, and it's impossible to ensure that they only read memory of processes belonging to any given namespace. This means that it's impossible to have a mechanically verifiable namespace-aware CAP_BPF capability, and as such another mechanism to allow safe usage of BPF functionality is necessary.BPF FS delegation mount options and BPF token derived from such BPF FS instance is such a mechanism. Kernel makes no assumption about what "trusted" constitutes in any particular case, and it's up to specific privileged applications and their surrounding infrastructure to decide that. What kernel provides is a set of APIs to setup and mount special BPF FS instanecs and derive BPF tokens from it. BPF FS and BPF token are both bound to its owning userns and in such a way are constrained inside intended container. Users can then pass BPF token FD to privileged bpf() syscall commands, like BPF map creation and BPF program loading, to perform such operations without having init userns privileged. This v4 incorporates feedback and suggestions ([3]) received on v3 of this patch set, and instead of allowing to create BPF tokens directly assuming capable(CAP_SYS_ADMIN), we instead enhance BPF FS to accepts a few new delegation mount options. If these options are used and BPF FS itself is properly created, set up, and mounted inside the user namespaced container, user application is able to derive a BPF token object from BPF FS instance, and pass that token to bpf() syscall. As explained in patch #2, BPF token itself doesn't grant access to BPF functionality, but instead allows kernel to do namespaced capabilities checks (ns_capable() vs capable()) for CAP_BPF, CAP_PERFMON, CAP_NET_ADMIN, and CAP_SYS_ADMIN, as applicable. So it forms one half of a puzzle and allows container managers and sys admins to have safe and flexible configuration options: determining which containers get delegation of BPF functionality through BPF FS, and then which applications within such containers are allowed to perform bpf() commands, based on namespaces capabilities. Previous attempt at addressing this very same problem ([0]) attempted to utilize authoritative LSM approach, but was conclusively rejected by upstream LSM maintainers. BPF token concept is not changing anything about LSM approach, but can be combined with LSM hooks for very fine-grained security policy. Some ideas about making BPF token more convenient to use with LSM (in particular custom BPF LSM programs) was briefly described in recent LSF/MM/BPF 2023 presentation ([1]). E.g., an ability to specify user-provided data (context), which in combination with BPF LSM would allow implementing a very dynamic and fine-granular custom security policies on top of BPF token. In the interest of minimizing API surface area and discussions this was relegated to follow up patches, as it's not essential to the fundamental concept of delegatable BPF token. It should be noted that BPF token is conceptually quite similar to the idea of /dev/bpf device file, proposed by Song a while ago ([2]). The biggest difference is the idea of using virtual anon_inode file to hold BPF token and allowing multiple independent instances of them, each (potentially) with its own set of restrictions. And also, crucially, BPF token approach is not using any special stateful task-scoped flags. Instead, bpf() syscall accepts token_fd parameters explicitly for each relevant BPF command. This addresses main concerns brought up during the /dev/bpf discussion, and fits better with overall BPF subsystem design. This patch set adds a basic minimum of functionality to make BPF token idea useful and to discuss API and functionality. Currently only low-level libbpf APIs support creating and passing BPF token around, allowing to test kernel functionality, but for the most part is not sufficient for real-world applications, which typically use high-level libbpf APIs based on `struct bpf_object` type. This was done with the intent to limit the size of patch set and concentrate on mostly kernel-side changes. All the necessary plumbing for libbpf will be sent as a separate follow up patch set kernel support makes it upstream. Another part that should happen once kernel-side BPF token is established, is a set of conventions between applications (e.g., systemd), tools (e.g., bpftool), and libraries (e.g., libbpf) on exposing delegatable BPF FS instance(s) at well-defined locations to allow applications take advantage of this in automatic fashion without explicit code changes on BPF application's side. But I'd like to postpone this discussion to after BPF token concept lands. [0] https://lore.kernel.org/bpf/20230412043300.360803-1-andrii@xxxxxxxxxx/ [1] http://vger.kernel.org/bpfconf2023_material/Trusted_unprivileged_BPF_LSFMM2023.pdf [2] https://lore.kernel.org/bpf/20190627201923.2589391-2-songliubraving@xxxxxx/ [3] https://lore.kernel.org/bpf/20230704-hochverdient-lehne-eeb9eeef785e@brauner/ v4->v5: - add pre-patch unifying CAP_NET_ADMIN handling inside kernel/bpf/syscall.c (Paul Moore); - fix build warnings and errors in selftests and kernel, detected by CI and kernel test robot; v3->v4: - add delegation mount options to BPF FS; - BPF token is derived from the instance of BPF FS and associates itself with BPF FS' owning userns; - BPF token doesn't grant BPF functionality directly, it just turns capable() checks into ns_capable() checks within BPF FS' owning user; - BPF token cannot be pinned; v2->v3: - make BPF_TOKEN_CREATE pin created BPF token in BPF FS, and disallow BPF_OBJ_PIN for BPF token; v1->v2: - fix build failures on Kconfig with CONFIG_BPF_SYSCALL unset; - drop BPF_F_TOKEN_UNKNOWN_* flags and simplify UAPI (Stanislav). Andrii Nakryiko (13): bpf: align CAP_NET_ADMIN checks with bpf_capable() approach bpf: add BPF token delegation mount options to BPF FS bpf: introduce BPF token object bpf: add BPF token support to BPF_MAP_CREATE command bpf: add BPF token support to BPF_BTF_LOAD command bpf: add BPF token support to BPF_PROG_LOAD command bpf: take into account BPF token when fetching helper protos bpf: consistenly use BPF token throughout BPF verifier logic libbpf: add bpf_token_create() API libbpf: add BPF token support to bpf_map_create() API libbpf: add BPF token support to bpf_btf_load() API libbpf: add BPF token support to bpf_prog_load() API selftests/bpf: add BPF token-enabled tests drivers/media/rc/bpf-lirc.c | 2 +- include/linux/bpf.h | 82 ++- include/linux/filter.h | 2 +- include/uapi/linux/bpf.h | 44 ++ kernel/bpf/Makefile | 2 +- kernel/bpf/arraymap.c | 2 +- kernel/bpf/cgroup.c | 6 +- kernel/bpf/core.c | 3 +- kernel/bpf/helpers.c | 6 +- kernel/bpf/inode.c | 93 ++- kernel/bpf/syscall.c | 190 ++++-- kernel/bpf/token.c | 229 +++++++ kernel/bpf/verifier.c | 13 +- kernel/trace/bpf_trace.c | 2 +- net/core/filter.c | 36 +- net/ipv4/bpf_tcp_ca.c | 2 +- net/netfilter/nf_bpf_link.c | 2 +- tools/include/uapi/linux/bpf.h | 44 ++ tools/lib/bpf/bpf.c | 30 +- tools/lib/bpf/bpf.h | 38 +- tools/lib/bpf/libbpf.map | 1 + .../selftests/bpf/prog_tests/libbpf_probes.c | 4 + .../selftests/bpf/prog_tests/libbpf_str.c | 6 + .../testing/selftests/bpf/prog_tests/token.c | 627 ++++++++++++++++++ 24 files changed, 1361 insertions(+), 105 deletions(-) create mode 100644 kernel/bpf/token.c create mode 100644 tools/testing/selftests/bpf/prog_tests/token.c -- 2.34.1
