324 lines
9.9 KiB
C
324 lines
9.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <test_progs.h>
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#include <bpf/btf.h>
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#include "lsm_cgroup.skel.h"
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#include "lsm_cgroup_nonvoid.skel.h"
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#include "cgroup_helpers.h"
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#include "network_helpers.h"
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#ifndef ENOTSUPP
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#define ENOTSUPP 524
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#endif
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static struct btf *btf;
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static __u32 query_prog_cnt(int cgroup_fd, const char *attach_func)
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{
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LIBBPF_OPTS(bpf_prog_query_opts, p);
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int cnt = 0;
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int i;
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ASSERT_OK(bpf_prog_query_opts(cgroup_fd, BPF_LSM_CGROUP, &p), "prog_query");
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if (!attach_func)
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return p.prog_cnt;
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/* When attach_func is provided, count the number of progs that
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* attach to the given symbol.
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*/
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if (!btf)
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btf = btf__load_vmlinux_btf();
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if (!ASSERT_OK(libbpf_get_error(btf), "btf_vmlinux"))
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return -1;
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p.prog_ids = malloc(sizeof(u32) * p.prog_cnt);
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p.prog_attach_flags = malloc(sizeof(u32) * p.prog_cnt);
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ASSERT_OK(bpf_prog_query_opts(cgroup_fd, BPF_LSM_CGROUP, &p), "prog_query");
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for (i = 0; i < p.prog_cnt; i++) {
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struct bpf_prog_info info = {};
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__u32 info_len = sizeof(info);
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int fd;
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fd = bpf_prog_get_fd_by_id(p.prog_ids[i]);
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ASSERT_GE(fd, 0, "prog_get_fd_by_id");
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ASSERT_OK(bpf_prog_get_info_by_fd(fd, &info, &info_len),
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"prog_info_by_fd");
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close(fd);
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if (info.attach_btf_id ==
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btf__find_by_name_kind(btf, attach_func, BTF_KIND_FUNC))
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cnt++;
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}
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free(p.prog_ids);
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free(p.prog_attach_flags);
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return cnt;
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}
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static void test_lsm_cgroup_functional(void)
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{
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DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, attach_opts);
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DECLARE_LIBBPF_OPTS(bpf_link_update_opts, update_opts);
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int cgroup_fd = -1, cgroup_fd2 = -1, cgroup_fd3 = -1;
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int listen_fd, client_fd, accepted_fd;
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struct lsm_cgroup *skel = NULL;
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int post_create_prog_fd2 = -1;
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int post_create_prog_fd = -1;
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int bind_link_fd2 = -1;
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int bind_prog_fd2 = -1;
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int alloc_prog_fd = -1;
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int bind_prog_fd = -1;
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int bind_link_fd = -1;
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int clone_prog_fd = -1;
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int err, fd, prio;
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socklen_t socklen;
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cgroup_fd3 = test__join_cgroup("/sock_policy_empty");
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if (!ASSERT_GE(cgroup_fd3, 0, "create empty cgroup"))
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goto close_cgroup;
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cgroup_fd2 = test__join_cgroup("/sock_policy_reuse");
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if (!ASSERT_GE(cgroup_fd2, 0, "create cgroup for reuse"))
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goto close_cgroup;
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cgroup_fd = test__join_cgroup("/sock_policy");
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if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup"))
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goto close_cgroup;
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skel = lsm_cgroup__open_and_load();
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if (!ASSERT_OK_PTR(skel, "open_and_load"))
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goto close_cgroup;
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post_create_prog_fd = bpf_program__fd(skel->progs.socket_post_create);
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post_create_prog_fd2 = bpf_program__fd(skel->progs.socket_post_create2);
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bind_prog_fd = bpf_program__fd(skel->progs.socket_bind);
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bind_prog_fd2 = bpf_program__fd(skel->progs.socket_bind2);
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alloc_prog_fd = bpf_program__fd(skel->progs.socket_alloc);
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clone_prog_fd = bpf_program__fd(skel->progs.socket_clone);
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ASSERT_EQ(query_prog_cnt(cgroup_fd, "bpf_lsm_sk_alloc_security"), 0, "prog count");
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ASSERT_EQ(query_prog_cnt(cgroup_fd, NULL), 0, "total prog count");
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err = bpf_prog_attach(alloc_prog_fd, cgroup_fd, BPF_LSM_CGROUP, 0);
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if (err == -ENOTSUPP) {
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test__skip();
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goto close_cgroup;
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}
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if (!ASSERT_OK(err, "attach alloc_prog_fd"))
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goto detach_cgroup;
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ASSERT_EQ(query_prog_cnt(cgroup_fd, "bpf_lsm_sk_alloc_security"), 1, "prog count");
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ASSERT_EQ(query_prog_cnt(cgroup_fd, NULL), 1, "total prog count");
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ASSERT_EQ(query_prog_cnt(cgroup_fd, "bpf_lsm_inet_csk_clone"), 0, "prog count");
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err = bpf_prog_attach(clone_prog_fd, cgroup_fd, BPF_LSM_CGROUP, 0);
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if (!ASSERT_OK(err, "attach clone_prog_fd"))
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goto detach_cgroup;
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ASSERT_EQ(query_prog_cnt(cgroup_fd, "bpf_lsm_inet_csk_clone"), 1, "prog count");
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ASSERT_EQ(query_prog_cnt(cgroup_fd, NULL), 2, "total prog count");
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/* Make sure replacing works. */
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ASSERT_EQ(query_prog_cnt(cgroup_fd, "bpf_lsm_socket_post_create"), 0, "prog count");
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err = bpf_prog_attach(post_create_prog_fd, cgroup_fd,
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BPF_LSM_CGROUP, 0);
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if (!ASSERT_OK(err, "attach post_create_prog_fd"))
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goto detach_cgroup;
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ASSERT_EQ(query_prog_cnt(cgroup_fd, "bpf_lsm_socket_post_create"), 1, "prog count");
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ASSERT_EQ(query_prog_cnt(cgroup_fd, NULL), 3, "total prog count");
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attach_opts.replace_prog_fd = post_create_prog_fd;
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err = bpf_prog_attach_opts(post_create_prog_fd2, cgroup_fd,
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BPF_LSM_CGROUP, &attach_opts);
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if (!ASSERT_OK(err, "prog replace post_create_prog_fd"))
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goto detach_cgroup;
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ASSERT_EQ(query_prog_cnt(cgroup_fd, "bpf_lsm_socket_post_create"), 1, "prog count");
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ASSERT_EQ(query_prog_cnt(cgroup_fd, NULL), 3, "total prog count");
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/* Try the same attach/replace via link API. */
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ASSERT_EQ(query_prog_cnt(cgroup_fd, "bpf_lsm_socket_bind"), 0, "prog count");
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bind_link_fd = bpf_link_create(bind_prog_fd, cgroup_fd,
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BPF_LSM_CGROUP, NULL);
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if (!ASSERT_GE(bind_link_fd, 0, "link create bind_prog_fd"))
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goto detach_cgroup;
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ASSERT_EQ(query_prog_cnt(cgroup_fd, "bpf_lsm_socket_bind"), 1, "prog count");
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ASSERT_EQ(query_prog_cnt(cgroup_fd, NULL), 4, "total prog count");
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update_opts.old_prog_fd = bind_prog_fd;
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update_opts.flags = BPF_F_REPLACE;
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err = bpf_link_update(bind_link_fd, bind_prog_fd2, &update_opts);
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if (!ASSERT_OK(err, "link update bind_prog_fd"))
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goto detach_cgroup;
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ASSERT_EQ(query_prog_cnt(cgroup_fd, "bpf_lsm_socket_bind"), 1, "prog count");
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ASSERT_EQ(query_prog_cnt(cgroup_fd, NULL), 4, "total prog count");
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/* Attach another instance of bind program to another cgroup.
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* This should trigger the reuse of the trampoline shim (two
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* programs attaching to the same btf_id).
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*/
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ASSERT_EQ(query_prog_cnt(cgroup_fd, "bpf_lsm_socket_bind"), 1, "prog count");
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ASSERT_EQ(query_prog_cnt(cgroup_fd2, "bpf_lsm_socket_bind"), 0, "prog count");
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bind_link_fd2 = bpf_link_create(bind_prog_fd2, cgroup_fd2,
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BPF_LSM_CGROUP, NULL);
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if (!ASSERT_GE(bind_link_fd2, 0, "link create bind_prog_fd2"))
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goto detach_cgroup;
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ASSERT_EQ(query_prog_cnt(cgroup_fd2, "bpf_lsm_socket_bind"), 1, "prog count");
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ASSERT_EQ(query_prog_cnt(cgroup_fd, NULL), 4, "total prog count");
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ASSERT_EQ(query_prog_cnt(cgroup_fd2, NULL), 1, "total prog count");
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fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (!(skel->kconfig->CONFIG_SECURITY_APPARMOR
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|| skel->kconfig->CONFIG_SECURITY_SELINUX
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|| skel->kconfig->CONFIG_SECURITY_SMACK))
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/* AF_UNIX is prohibited. */
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ASSERT_LT(fd, 0, "socket(AF_UNIX)");
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close(fd);
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/* AF_INET6 gets default policy (sk_priority). */
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fd = socket(AF_INET6, SOCK_STREAM, 0);
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if (!ASSERT_GE(fd, 0, "socket(SOCK_STREAM)"))
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goto detach_cgroup;
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prio = 0;
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socklen = sizeof(prio);
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ASSERT_GE(getsockopt(fd, SOL_SOCKET, SO_PRIORITY, &prio, &socklen), 0,
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"getsockopt");
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ASSERT_EQ(prio, 123, "sk_priority");
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close(fd);
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/* TX-only AF_PACKET is allowed. */
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ASSERT_LT(socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL)), 0,
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"socket(AF_PACKET, ..., ETH_P_ALL)");
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fd = socket(AF_PACKET, SOCK_RAW, 0);
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ASSERT_GE(fd, 0, "socket(AF_PACKET, ..., 0)");
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/* TX-only AF_PACKET can not be rebound. */
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struct sockaddr_ll sa = {
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.sll_family = AF_PACKET,
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.sll_protocol = htons(ETH_P_ALL),
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};
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ASSERT_LT(bind(fd, (struct sockaddr *)&sa, sizeof(sa)), 0,
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"bind(ETH_P_ALL)");
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close(fd);
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/* Trigger passive open. */
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listen_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0);
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ASSERT_GE(listen_fd, 0, "start_server");
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client_fd = connect_to_fd(listen_fd, 0);
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ASSERT_GE(client_fd, 0, "connect_to_fd");
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accepted_fd = accept(listen_fd, NULL, NULL);
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ASSERT_GE(accepted_fd, 0, "accept");
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prio = 0;
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socklen = sizeof(prio);
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ASSERT_GE(getsockopt(accepted_fd, SOL_SOCKET, SO_PRIORITY, &prio, &socklen), 0,
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"getsockopt");
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ASSERT_EQ(prio, 234, "sk_priority");
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/* These are replaced and never called. */
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ASSERT_EQ(skel->bss->called_socket_post_create, 0, "called_create");
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ASSERT_EQ(skel->bss->called_socket_bind, 0, "called_bind");
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/* AF_INET6+SOCK_STREAM
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* AF_PACKET+SOCK_RAW
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* AF_UNIX+SOCK_RAW if already have non-bpf lsms installed
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* listen_fd
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* client_fd
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* accepted_fd
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*/
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if (skel->kconfig->CONFIG_SECURITY_APPARMOR
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|| skel->kconfig->CONFIG_SECURITY_SELINUX
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|| skel->kconfig->CONFIG_SECURITY_SMACK)
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/* AF_UNIX+SOCK_RAW if already have non-bpf lsms installed */
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ASSERT_EQ(skel->bss->called_socket_post_create2, 6, "called_create2");
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else
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ASSERT_EQ(skel->bss->called_socket_post_create2, 5, "called_create2");
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/* start_server
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* bind(ETH_P_ALL)
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*/
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ASSERT_EQ(skel->bss->called_socket_bind2, 2, "called_bind2");
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/* Single accept(). */
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ASSERT_EQ(skel->bss->called_socket_clone, 1, "called_clone");
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/* AF_UNIX+SOCK_STREAM (failed)
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* AF_INET6+SOCK_STREAM
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* AF_PACKET+SOCK_RAW (failed)
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* AF_PACKET+SOCK_RAW
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* listen_fd
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* client_fd
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* accepted_fd
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*/
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ASSERT_EQ(skel->bss->called_socket_alloc, 7, "called_alloc");
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close(listen_fd);
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close(client_fd);
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close(accepted_fd);
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/* Make sure other cgroup doesn't trigger the programs. */
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if (!ASSERT_OK(join_cgroup("/sock_policy_empty"), "join root cgroup"))
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goto detach_cgroup;
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fd = socket(AF_INET6, SOCK_STREAM, 0);
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if (!ASSERT_GE(fd, 0, "socket(SOCK_STREAM)"))
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goto detach_cgroup;
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prio = 0;
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socklen = sizeof(prio);
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ASSERT_GE(getsockopt(fd, SOL_SOCKET, SO_PRIORITY, &prio, &socklen), 0,
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"getsockopt");
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ASSERT_EQ(prio, 0, "sk_priority");
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close(fd);
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detach_cgroup:
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ASSERT_GE(bpf_prog_detach2(post_create_prog_fd2, cgroup_fd,
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BPF_LSM_CGROUP), 0, "detach_create");
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close(bind_link_fd);
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/* Don't close bind_link_fd2, exercise cgroup release cleanup. */
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ASSERT_GE(bpf_prog_detach2(alloc_prog_fd, cgroup_fd,
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BPF_LSM_CGROUP), 0, "detach_alloc");
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ASSERT_GE(bpf_prog_detach2(clone_prog_fd, cgroup_fd,
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BPF_LSM_CGROUP), 0, "detach_clone");
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close_cgroup:
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close(cgroup_fd);
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close(cgroup_fd2);
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close(cgroup_fd3);
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lsm_cgroup__destroy(skel);
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}
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static void test_lsm_cgroup_nonvoid(void)
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{
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struct lsm_cgroup_nonvoid *skel = NULL;
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skel = lsm_cgroup_nonvoid__open_and_load();
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ASSERT_NULL(skel, "open succeeds");
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lsm_cgroup_nonvoid__destroy(skel);
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}
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void test_lsm_cgroup(void)
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{
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if (test__start_subtest("functional"))
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test_lsm_cgroup_functional();
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if (test__start_subtest("nonvoid"))
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test_lsm_cgroup_nonvoid();
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btf__free(btf);
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}
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