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90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <linux/netlink.h>
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#include <stdio.h>
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#include <sys/socket.h>
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#include "alloc-util.h"
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#include "audit-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "macro.h"
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#include "parse-util.h"
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#include "process-util.h"
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#include "user-util.h"
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int audit_session_from_pid(pid_t pid, uint32_t *id) {
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_cleanup_free_ char *s = NULL;
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const char *p;
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uint32_t u;
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int r;
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assert(id);
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/* We don't convert ENOENT to ESRCH here, since we can't
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* really distinguish between "audit is not available in the
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* kernel" and "the process does not exist", both which will
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* result in ENOENT. */
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p = procfs_file_alloca(pid, "sessionid");
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r = read_one_line_file(p, &s);
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if (r < 0)
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return r;
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r = safe_atou32(s, &u);
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if (r < 0)
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return r;
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if (!audit_session_is_valid(u))
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return -ENODATA;
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*id = u;
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return 0;
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}
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int audit_loginuid_from_pid(pid_t pid, uid_t *uid) {
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_cleanup_free_ char *s = NULL;
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const char *p;
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uid_t u;
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int r;
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assert(uid);
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p = procfs_file_alloca(pid, "loginuid");
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r = read_one_line_file(p, &s);
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if (r < 0)
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return r;
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r = parse_uid(s, &u);
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if (r == -ENXIO) /* the UID was -1 */
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return -ENODATA;
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if (r < 0)
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return r;
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*uid = u;
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return 0;
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}
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bool use_audit(void) {
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static int cached_use = -1;
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if (cached_use < 0) {
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int fd;
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fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_AUDIT);
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if (fd < 0) {
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cached_use = !IN_SET(errno, EAFNOSUPPORT, EPROTONOSUPPORT, EPERM);
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if (!cached_use)
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log_debug_errno(errno, "Won't talk to audit: %m");
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} else {
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cached_use = true;
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safe_close(fd);
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}
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}
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return cached_use;
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}
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