/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <assert.h> #include <string.h> #include <unistd.h> #include <errno.h> #include <stdlib.h> #include <stdio.h> #include <ctype.h> #include <sys/prctl.h> #include <sys/capability.h> #include "macro.h" #include "audit.h" #include "util.h" #include "log.h" int audit_session_from_pid(pid_t pid, uint32_t *id) { char *s; uint32_t u; int r; assert(id); if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0) return -ENOENT; if (pid == 0) r = read_one_line_file("/proc/self/sessionid", &s); else { char *p; if (asprintf(&p, "/proc/%lu/sessionid", (unsigned long) pid) < 0) return -ENOMEM; r = read_one_line_file(p, &s); free(p); } if (r < 0) return r; r = safe_atou32(s, &u); free(s); if (r < 0) return r; if (u == (uint32_t) -1 || u <= 0) return -ENOENT; *id = u; return 0; } int audit_loginuid_from_pid(pid_t pid, uid_t *uid) { char *s; uid_t u; int r; assert(uid); /* Only use audit login uid if we are executed with sufficient * capabilities so that pam_loginuid could do its job. If we * are lacking the CAP_AUDIT_CONTROL capabality we most likely * are being run in a container and /proc/self/loginuid is * useless since it probably contains a uid of the host * system. */ if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0) return -ENOENT; if (pid == 0) r = read_one_line_file("/proc/self/loginuid", &s); else { char *p; if (asprintf(&p, "/proc/%lu/loginuid", (unsigned long) pid) < 0) return -ENOMEM; r = read_one_line_file(p, &s); free(p); } if (r < 0) return r; r = parse_uid(s, &u); free(s); if (r < 0) return r; if (u == (uid_t) -1) return -ENOENT; *uid = (uid_t) u; return 0; }