mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-12 05:06:39 +07:00
b8989bccd6
Pull audit updates from Paul Moore: "The audit changes for v4.11 are relatively small compared to what we did for v4.10, both in terms of size and impact. - two patches from Steve tweak the formatting for some of the audit records to make them more consistent with other audit records. - three patches from Richard record the name of a module on module load, fix the logging of sockaddr information when using socketcall() on 32-bit systems, and add the ability to reset audit's lost record counter. - my lone patch just fixes an annoying style nit that I was reminded about by one of Richard's patches. All these patches pass our test suite" * 'stable-4.11' of git://git.infradead.org/users/pcmoore/audit: audit: remove unnecessary curly braces from switch/case statements audit: log module name on init_module audit: log 32-bit socketcalls audit: add feature audit_lost reset audit: Make AUDIT_ANOM_ABEND event normalized audit: Make AUDIT_KERNEL event conform to the specification
2453 lines
65 KiB
C
2453 lines
65 KiB
C
/* auditsc.c -- System-call auditing support
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* Handles all system-call specific auditing features.
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*
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* Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
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* Copyright 2005 Hewlett-Packard Development Company, L.P.
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* Copyright (C) 2005, 2006 IBM Corporation
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Written by Rickard E. (Rik) Faith <faith@redhat.com>
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*
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* Many of the ideas implemented here are from Stephen C. Tweedie,
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* especially the idea of avoiding a copy by using getname.
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*
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* The method for actual interception of syscall entry and exit (not in
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* this file -- see entry.S) is based on a GPL'd patch written by
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* okir@suse.de and Copyright 2003 SuSE Linux AG.
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*
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* POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>,
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* 2006.
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*
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* The support of additional filter rules compares (>, <, >=, <=) was
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* added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005.
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*
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* Modified by Amy Griffis <amy.griffis@hp.com> to collect additional
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* filesystem information.
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*
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* Subject and object context labeling support added by <danjones@us.ibm.com>
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* and <dustin.kirkland@us.ibm.com> for LSPP certification compliance.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <asm/types.h>
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#include <linux/atomic.h>
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#include <linux/fs.h>
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#include <linux/namei.h>
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#include <linux/mm.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/mount.h>
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#include <linux/socket.h>
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#include <linux/mqueue.h>
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#include <linux/audit.h>
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#include <linux/personality.h>
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#include <linux/time.h>
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#include <linux/netlink.h>
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#include <linux/compiler.h>
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#include <asm/unistd.h>
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#include <linux/security.h>
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#include <linux/list.h>
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#include <linux/binfmts.h>
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#include <linux/highmem.h>
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#include <linux/syscalls.h>
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#include <asm/syscall.h>
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#include <linux/capability.h>
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#include <linux/fs_struct.h>
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#include <linux/compat.h>
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#include <linux/ctype.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <uapi/linux/limits.h>
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#include "audit.h"
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/* flags stating the success for a syscall */
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#define AUDITSC_INVALID 0
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#define AUDITSC_SUCCESS 1
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#define AUDITSC_FAILURE 2
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/* no execve audit message should be longer than this (userspace limits),
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* see the note near the top of audit_log_execve_info() about this value */
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#define MAX_EXECVE_AUDIT_LEN 7500
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/* max length to print of cmdline/proctitle value during audit */
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#define MAX_PROCTITLE_AUDIT_LEN 128
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/* number of audit rules */
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int audit_n_rules;
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/* determines whether we collect data for signals sent */
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int audit_signals;
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struct audit_aux_data {
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struct audit_aux_data *next;
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int type;
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};
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#define AUDIT_AUX_IPCPERM 0
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/* Number of target pids per aux struct. */
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#define AUDIT_AUX_PIDS 16
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struct audit_aux_data_pids {
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struct audit_aux_data d;
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pid_t target_pid[AUDIT_AUX_PIDS];
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kuid_t target_auid[AUDIT_AUX_PIDS];
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kuid_t target_uid[AUDIT_AUX_PIDS];
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unsigned int target_sessionid[AUDIT_AUX_PIDS];
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u32 target_sid[AUDIT_AUX_PIDS];
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char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
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int pid_count;
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};
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struct audit_aux_data_bprm_fcaps {
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struct audit_aux_data d;
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struct audit_cap_data fcap;
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unsigned int fcap_ver;
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struct audit_cap_data old_pcap;
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struct audit_cap_data new_pcap;
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};
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struct audit_tree_refs {
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struct audit_tree_refs *next;
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struct audit_chunk *c[31];
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};
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static int audit_match_perm(struct audit_context *ctx, int mask)
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{
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unsigned n;
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if (unlikely(!ctx))
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return 0;
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n = ctx->major;
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switch (audit_classify_syscall(ctx->arch, n)) {
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case 0: /* native */
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if ((mask & AUDIT_PERM_WRITE) &&
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audit_match_class(AUDIT_CLASS_WRITE, n))
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return 1;
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if ((mask & AUDIT_PERM_READ) &&
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audit_match_class(AUDIT_CLASS_READ, n))
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return 1;
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if ((mask & AUDIT_PERM_ATTR) &&
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audit_match_class(AUDIT_CLASS_CHATTR, n))
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return 1;
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return 0;
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case 1: /* 32bit on biarch */
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if ((mask & AUDIT_PERM_WRITE) &&
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audit_match_class(AUDIT_CLASS_WRITE_32, n))
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return 1;
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if ((mask & AUDIT_PERM_READ) &&
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audit_match_class(AUDIT_CLASS_READ_32, n))
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return 1;
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if ((mask & AUDIT_PERM_ATTR) &&
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audit_match_class(AUDIT_CLASS_CHATTR_32, n))
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return 1;
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return 0;
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case 2: /* open */
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return mask & ACC_MODE(ctx->argv[1]);
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case 3: /* openat */
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return mask & ACC_MODE(ctx->argv[2]);
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case 4: /* socketcall */
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return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
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case 5: /* execve */
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return mask & AUDIT_PERM_EXEC;
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default:
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return 0;
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}
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}
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static int audit_match_filetype(struct audit_context *ctx, int val)
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{
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struct audit_names *n;
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umode_t mode = (umode_t)val;
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if (unlikely(!ctx))
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return 0;
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list_for_each_entry(n, &ctx->names_list, list) {
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if ((n->ino != AUDIT_INO_UNSET) &&
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((n->mode & S_IFMT) == mode))
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return 1;
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}
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return 0;
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}
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/*
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* We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *;
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* ->first_trees points to its beginning, ->trees - to the current end of data.
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* ->tree_count is the number of free entries in array pointed to by ->trees.
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* Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL,
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* "empty" becomes (p, p, 31) afterwards. We don't shrink the list (and seriously,
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* it's going to remain 1-element for almost any setup) until we free context itself.
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* References in it _are_ dropped - at the same time we free/drop aux stuff.
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*/
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#ifdef CONFIG_AUDIT_TREE
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static void audit_set_auditable(struct audit_context *ctx)
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{
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if (!ctx->prio) {
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ctx->prio = 1;
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ctx->current_state = AUDIT_RECORD_CONTEXT;
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}
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}
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static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
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{
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struct audit_tree_refs *p = ctx->trees;
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int left = ctx->tree_count;
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if (likely(left)) {
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p->c[--left] = chunk;
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ctx->tree_count = left;
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return 1;
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}
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if (!p)
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return 0;
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p = p->next;
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if (p) {
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p->c[30] = chunk;
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ctx->trees = p;
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ctx->tree_count = 30;
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return 1;
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}
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return 0;
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}
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static int grow_tree_refs(struct audit_context *ctx)
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{
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struct audit_tree_refs *p = ctx->trees;
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ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL);
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if (!ctx->trees) {
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ctx->trees = p;
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return 0;
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}
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if (p)
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p->next = ctx->trees;
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else
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ctx->first_trees = ctx->trees;
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ctx->tree_count = 31;
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return 1;
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}
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#endif
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static void unroll_tree_refs(struct audit_context *ctx,
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struct audit_tree_refs *p, int count)
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{
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#ifdef CONFIG_AUDIT_TREE
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struct audit_tree_refs *q;
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int n;
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if (!p) {
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/* we started with empty chain */
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p = ctx->first_trees;
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count = 31;
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/* if the very first allocation has failed, nothing to do */
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if (!p)
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return;
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}
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n = count;
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for (q = p; q != ctx->trees; q = q->next, n = 31) {
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while (n--) {
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audit_put_chunk(q->c[n]);
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q->c[n] = NULL;
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}
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}
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while (n-- > ctx->tree_count) {
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audit_put_chunk(q->c[n]);
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q->c[n] = NULL;
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}
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ctx->trees = p;
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ctx->tree_count = count;
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#endif
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}
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static void free_tree_refs(struct audit_context *ctx)
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{
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struct audit_tree_refs *p, *q;
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for (p = ctx->first_trees; p; p = q) {
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q = p->next;
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kfree(p);
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}
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}
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static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
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{
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#ifdef CONFIG_AUDIT_TREE
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struct audit_tree_refs *p;
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int n;
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if (!tree)
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return 0;
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/* full ones */
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for (p = ctx->first_trees; p != ctx->trees; p = p->next) {
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for (n = 0; n < 31; n++)
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if (audit_tree_match(p->c[n], tree))
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return 1;
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}
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/* partial */
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if (p) {
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for (n = ctx->tree_count; n < 31; n++)
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if (audit_tree_match(p->c[n], tree))
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return 1;
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}
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#endif
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return 0;
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}
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static int audit_compare_uid(kuid_t uid,
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struct audit_names *name,
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struct audit_field *f,
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struct audit_context *ctx)
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{
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struct audit_names *n;
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int rc;
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if (name) {
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rc = audit_uid_comparator(uid, f->op, name->uid);
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if (rc)
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return rc;
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}
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if (ctx) {
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list_for_each_entry(n, &ctx->names_list, list) {
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rc = audit_uid_comparator(uid, f->op, n->uid);
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if (rc)
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return rc;
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}
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}
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return 0;
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}
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static int audit_compare_gid(kgid_t gid,
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struct audit_names *name,
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struct audit_field *f,
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struct audit_context *ctx)
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{
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struct audit_names *n;
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int rc;
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if (name) {
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rc = audit_gid_comparator(gid, f->op, name->gid);
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if (rc)
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return rc;
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}
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if (ctx) {
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list_for_each_entry(n, &ctx->names_list, list) {
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rc = audit_gid_comparator(gid, f->op, n->gid);
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if (rc)
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return rc;
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}
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}
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return 0;
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}
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static int audit_field_compare(struct task_struct *tsk,
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const struct cred *cred,
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struct audit_field *f,
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struct audit_context *ctx,
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struct audit_names *name)
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{
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switch (f->val) {
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/* process to file object comparisons */
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case AUDIT_COMPARE_UID_TO_OBJ_UID:
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return audit_compare_uid(cred->uid, name, f, ctx);
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case AUDIT_COMPARE_GID_TO_OBJ_GID:
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return audit_compare_gid(cred->gid, name, f, ctx);
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case AUDIT_COMPARE_EUID_TO_OBJ_UID:
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return audit_compare_uid(cred->euid, name, f, ctx);
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case AUDIT_COMPARE_EGID_TO_OBJ_GID:
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return audit_compare_gid(cred->egid, name, f, ctx);
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case AUDIT_COMPARE_AUID_TO_OBJ_UID:
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return audit_compare_uid(tsk->loginuid, name, f, ctx);
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case AUDIT_COMPARE_SUID_TO_OBJ_UID:
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return audit_compare_uid(cred->suid, name, f, ctx);
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case AUDIT_COMPARE_SGID_TO_OBJ_GID:
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return audit_compare_gid(cred->sgid, name, f, ctx);
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case AUDIT_COMPARE_FSUID_TO_OBJ_UID:
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return audit_compare_uid(cred->fsuid, name, f, ctx);
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case AUDIT_COMPARE_FSGID_TO_OBJ_GID:
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return audit_compare_gid(cred->fsgid, name, f, ctx);
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/* uid comparisons */
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case AUDIT_COMPARE_UID_TO_AUID:
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return audit_uid_comparator(cred->uid, f->op, tsk->loginuid);
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case AUDIT_COMPARE_UID_TO_EUID:
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return audit_uid_comparator(cred->uid, f->op, cred->euid);
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case AUDIT_COMPARE_UID_TO_SUID:
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return audit_uid_comparator(cred->uid, f->op, cred->suid);
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case AUDIT_COMPARE_UID_TO_FSUID:
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return audit_uid_comparator(cred->uid, f->op, cred->fsuid);
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/* auid comparisons */
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case AUDIT_COMPARE_AUID_TO_EUID:
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return audit_uid_comparator(tsk->loginuid, f->op, cred->euid);
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case AUDIT_COMPARE_AUID_TO_SUID:
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return audit_uid_comparator(tsk->loginuid, f->op, cred->suid);
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case AUDIT_COMPARE_AUID_TO_FSUID:
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return audit_uid_comparator(tsk->loginuid, f->op, cred->fsuid);
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/* euid comparisons */
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case AUDIT_COMPARE_EUID_TO_SUID:
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return audit_uid_comparator(cred->euid, f->op, cred->suid);
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case AUDIT_COMPARE_EUID_TO_FSUID:
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return audit_uid_comparator(cred->euid, f->op, cred->fsuid);
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/* suid comparisons */
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case AUDIT_COMPARE_SUID_TO_FSUID:
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return audit_uid_comparator(cred->suid, f->op, cred->fsuid);
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/* gid comparisons */
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case AUDIT_COMPARE_GID_TO_EGID:
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return audit_gid_comparator(cred->gid, f->op, cred->egid);
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case AUDIT_COMPARE_GID_TO_SGID:
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return audit_gid_comparator(cred->gid, f->op, cred->sgid);
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case AUDIT_COMPARE_GID_TO_FSGID:
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return audit_gid_comparator(cred->gid, f->op, cred->fsgid);
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/* egid comparisons */
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case AUDIT_COMPARE_EGID_TO_SGID:
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return audit_gid_comparator(cred->egid, f->op, cred->sgid);
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case AUDIT_COMPARE_EGID_TO_FSGID:
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return audit_gid_comparator(cred->egid, f->op, cred->fsgid);
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/* sgid comparison */
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case AUDIT_COMPARE_SGID_TO_FSGID:
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return audit_gid_comparator(cred->sgid, f->op, cred->fsgid);
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default:
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WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n");
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return 0;
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}
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return 0;
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}
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/* Determine if any context name data matches a rule's watch data */
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/* Compare a task_struct with an audit_rule. Return 1 on match, 0
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* otherwise.
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*
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* If task_creation is true, this is an explicit indication that we are
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* filtering a task rule at task creation time. This and tsk == current are
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* the only situations where tsk->cred may be accessed without an rcu read lock.
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*/
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static int audit_filter_rules(struct task_struct *tsk,
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struct audit_krule *rule,
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struct audit_context *ctx,
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struct audit_names *name,
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enum audit_state *state,
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bool task_creation)
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{
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const struct cred *cred;
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int i, need_sid = 1;
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u32 sid;
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unsigned int sessionid;
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cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
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for (i = 0; i < rule->field_count; i++) {
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struct audit_field *f = &rule->fields[i];
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struct audit_names *n;
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int result = 0;
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pid_t pid;
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switch (f->type) {
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case AUDIT_PID:
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pid = task_tgid_nr(tsk);
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result = audit_comparator(pid, f->op, f->val);
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break;
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case AUDIT_PPID:
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if (ctx) {
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if (!ctx->ppid)
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ctx->ppid = task_ppid_nr(tsk);
|
|
result = audit_comparator(ctx->ppid, f->op, f->val);
|
|
}
|
|
break;
|
|
case AUDIT_EXE:
|
|
result = audit_exe_compare(tsk, rule->exe);
|
|
break;
|
|
case AUDIT_UID:
|
|
result = audit_uid_comparator(cred->uid, f->op, f->uid);
|
|
break;
|
|
case AUDIT_EUID:
|
|
result = audit_uid_comparator(cred->euid, f->op, f->uid);
|
|
break;
|
|
case AUDIT_SUID:
|
|
result = audit_uid_comparator(cred->suid, f->op, f->uid);
|
|
break;
|
|
case AUDIT_FSUID:
|
|
result = audit_uid_comparator(cred->fsuid, f->op, f->uid);
|
|
break;
|
|
case AUDIT_GID:
|
|
result = audit_gid_comparator(cred->gid, f->op, f->gid);
|
|
if (f->op == Audit_equal) {
|
|
if (!result)
|
|
result = in_group_p(f->gid);
|
|
} else if (f->op == Audit_not_equal) {
|
|
if (result)
|
|
result = !in_group_p(f->gid);
|
|
}
|
|
break;
|
|
case AUDIT_EGID:
|
|
result = audit_gid_comparator(cred->egid, f->op, f->gid);
|
|
if (f->op == Audit_equal) {
|
|
if (!result)
|
|
result = in_egroup_p(f->gid);
|
|
} else if (f->op == Audit_not_equal) {
|
|
if (result)
|
|
result = !in_egroup_p(f->gid);
|
|
}
|
|
break;
|
|
case AUDIT_SGID:
|
|
result = audit_gid_comparator(cred->sgid, f->op, f->gid);
|
|
break;
|
|
case AUDIT_FSGID:
|
|
result = audit_gid_comparator(cred->fsgid, f->op, f->gid);
|
|
break;
|
|
case AUDIT_SESSIONID:
|
|
sessionid = audit_get_sessionid(current);
|
|
result = audit_comparator(sessionid, f->op, f->val);
|
|
break;
|
|
case AUDIT_PERS:
|
|
result = audit_comparator(tsk->personality, f->op, f->val);
|
|
break;
|
|
case AUDIT_ARCH:
|
|
if (ctx)
|
|
result = audit_comparator(ctx->arch, f->op, f->val);
|
|
break;
|
|
|
|
case AUDIT_EXIT:
|
|
if (ctx && ctx->return_valid)
|
|
result = audit_comparator(ctx->return_code, f->op, f->val);
|
|
break;
|
|
case AUDIT_SUCCESS:
|
|
if (ctx && ctx->return_valid) {
|
|
if (f->val)
|
|
result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
|
|
else
|
|
result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
|
|
}
|
|
break;
|
|
case AUDIT_DEVMAJOR:
|
|
if (name) {
|
|
if (audit_comparator(MAJOR(name->dev), f->op, f->val) ||
|
|
audit_comparator(MAJOR(name->rdev), f->op, f->val))
|
|
++result;
|
|
} else if (ctx) {
|
|
list_for_each_entry(n, &ctx->names_list, list) {
|
|
if (audit_comparator(MAJOR(n->dev), f->op, f->val) ||
|
|
audit_comparator(MAJOR(n->rdev), f->op, f->val)) {
|
|
++result;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case AUDIT_DEVMINOR:
|
|
if (name) {
|
|
if (audit_comparator(MINOR(name->dev), f->op, f->val) ||
|
|
audit_comparator(MINOR(name->rdev), f->op, f->val))
|
|
++result;
|
|
} else if (ctx) {
|
|
list_for_each_entry(n, &ctx->names_list, list) {
|
|
if (audit_comparator(MINOR(n->dev), f->op, f->val) ||
|
|
audit_comparator(MINOR(n->rdev), f->op, f->val)) {
|
|
++result;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case AUDIT_INODE:
|
|
if (name)
|
|
result = audit_comparator(name->ino, f->op, f->val);
|
|
else if (ctx) {
|
|
list_for_each_entry(n, &ctx->names_list, list) {
|
|
if (audit_comparator(n->ino, f->op, f->val)) {
|
|
++result;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case AUDIT_OBJ_UID:
|
|
if (name) {
|
|
result = audit_uid_comparator(name->uid, f->op, f->uid);
|
|
} else if (ctx) {
|
|
list_for_each_entry(n, &ctx->names_list, list) {
|
|
if (audit_uid_comparator(n->uid, f->op, f->uid)) {
|
|
++result;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case AUDIT_OBJ_GID:
|
|
if (name) {
|
|
result = audit_gid_comparator(name->gid, f->op, f->gid);
|
|
} else if (ctx) {
|
|
list_for_each_entry(n, &ctx->names_list, list) {
|
|
if (audit_gid_comparator(n->gid, f->op, f->gid)) {
|
|
++result;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case AUDIT_WATCH:
|
|
if (name)
|
|
result = audit_watch_compare(rule->watch, name->ino, name->dev);
|
|
break;
|
|
case AUDIT_DIR:
|
|
if (ctx)
|
|
result = match_tree_refs(ctx, rule->tree);
|
|
break;
|
|
case AUDIT_LOGINUID:
|
|
result = audit_uid_comparator(tsk->loginuid, f->op, f->uid);
|
|
break;
|
|
case AUDIT_LOGINUID_SET:
|
|
result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
|
|
break;
|
|
case AUDIT_SUBJ_USER:
|
|
case AUDIT_SUBJ_ROLE:
|
|
case AUDIT_SUBJ_TYPE:
|
|
case AUDIT_SUBJ_SEN:
|
|
case AUDIT_SUBJ_CLR:
|
|
/* NOTE: this may return negative values indicating
|
|
a temporary error. We simply treat this as a
|
|
match for now to avoid losing information that
|
|
may be wanted. An error message will also be
|
|
logged upon error */
|
|
if (f->lsm_rule) {
|
|
if (need_sid) {
|
|
security_task_getsecid(tsk, &sid);
|
|
need_sid = 0;
|
|
}
|
|
result = security_audit_rule_match(sid, f->type,
|
|
f->op,
|
|
f->lsm_rule,
|
|
ctx);
|
|
}
|
|
break;
|
|
case AUDIT_OBJ_USER:
|
|
case AUDIT_OBJ_ROLE:
|
|
case AUDIT_OBJ_TYPE:
|
|
case AUDIT_OBJ_LEV_LOW:
|
|
case AUDIT_OBJ_LEV_HIGH:
|
|
/* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR
|
|
also applies here */
|
|
if (f->lsm_rule) {
|
|
/* Find files that match */
|
|
if (name) {
|
|
result = security_audit_rule_match(
|
|
name->osid, f->type, f->op,
|
|
f->lsm_rule, ctx);
|
|
} else if (ctx) {
|
|
list_for_each_entry(n, &ctx->names_list, list) {
|
|
if (security_audit_rule_match(n->osid, f->type,
|
|
f->op, f->lsm_rule,
|
|
ctx)) {
|
|
++result;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
/* Find ipc objects that match */
|
|
if (!ctx || ctx->type != AUDIT_IPC)
|
|
break;
|
|
if (security_audit_rule_match(ctx->ipc.osid,
|
|
f->type, f->op,
|
|
f->lsm_rule, ctx))
|
|
++result;
|
|
}
|
|
break;
|
|
case AUDIT_ARG0:
|
|
case AUDIT_ARG1:
|
|
case AUDIT_ARG2:
|
|
case AUDIT_ARG3:
|
|
if (ctx)
|
|
result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
|
|
break;
|
|
case AUDIT_FILTERKEY:
|
|
/* ignore this field for filtering */
|
|
result = 1;
|
|
break;
|
|
case AUDIT_PERM:
|
|
result = audit_match_perm(ctx, f->val);
|
|
break;
|
|
case AUDIT_FILETYPE:
|
|
result = audit_match_filetype(ctx, f->val);
|
|
break;
|
|
case AUDIT_FIELD_COMPARE:
|
|
result = audit_field_compare(tsk, cred, f, ctx, name);
|
|
break;
|
|
}
|
|
if (!result)
|
|
return 0;
|
|
}
|
|
|
|
if (ctx) {
|
|
if (rule->prio <= ctx->prio)
|
|
return 0;
|
|
if (rule->filterkey) {
|
|
kfree(ctx->filterkey);
|
|
ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
|
|
}
|
|
ctx->prio = rule->prio;
|
|
}
|
|
switch (rule->action) {
|
|
case AUDIT_NEVER:
|
|
*state = AUDIT_DISABLED;
|
|
break;
|
|
case AUDIT_ALWAYS:
|
|
*state = AUDIT_RECORD_CONTEXT;
|
|
break;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* At process creation time, we can determine if system-call auditing is
|
|
* completely disabled for this task. Since we only have the task
|
|
* structure at this point, we can only check uid and gid.
|
|
*/
|
|
static enum audit_state audit_filter_task(struct task_struct *tsk, char **key)
|
|
{
|
|
struct audit_entry *e;
|
|
enum audit_state state;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
|
|
if (audit_filter_rules(tsk, &e->rule, NULL, NULL,
|
|
&state, true)) {
|
|
if (state == AUDIT_RECORD_CONTEXT)
|
|
*key = kstrdup(e->rule.filterkey, GFP_ATOMIC);
|
|
rcu_read_unlock();
|
|
return state;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return AUDIT_BUILD_CONTEXT;
|
|
}
|
|
|
|
static int audit_in_mask(const struct audit_krule *rule, unsigned long val)
|
|
{
|
|
int word, bit;
|
|
|
|
if (val > 0xffffffff)
|
|
return false;
|
|
|
|
word = AUDIT_WORD(val);
|
|
if (word >= AUDIT_BITMASK_SIZE)
|
|
return false;
|
|
|
|
bit = AUDIT_BIT(val);
|
|
|
|
return rule->mask[word] & bit;
|
|
}
|
|
|
|
/* At syscall entry and exit time, this filter is called if the
|
|
* audit_state is not low enough that auditing cannot take place, but is
|
|
* also not high enough that we already know we have to write an audit
|
|
* record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
|
|
*/
|
|
static enum audit_state audit_filter_syscall(struct task_struct *tsk,
|
|
struct audit_context *ctx,
|
|
struct list_head *list)
|
|
{
|
|
struct audit_entry *e;
|
|
enum audit_state state;
|
|
|
|
if (audit_pid && tsk->tgid == audit_pid)
|
|
return AUDIT_DISABLED;
|
|
|
|
rcu_read_lock();
|
|
if (!list_empty(list)) {
|
|
list_for_each_entry_rcu(e, list, list) {
|
|
if (audit_in_mask(&e->rule, ctx->major) &&
|
|
audit_filter_rules(tsk, &e->rule, ctx, NULL,
|
|
&state, false)) {
|
|
rcu_read_unlock();
|
|
ctx->current_state = state;
|
|
return state;
|
|
}
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return AUDIT_BUILD_CONTEXT;
|
|
}
|
|
|
|
/*
|
|
* Given an audit_name check the inode hash table to see if they match.
|
|
* Called holding the rcu read lock to protect the use of audit_inode_hash
|
|
*/
|
|
static int audit_filter_inode_name(struct task_struct *tsk,
|
|
struct audit_names *n,
|
|
struct audit_context *ctx) {
|
|
int h = audit_hash_ino((u32)n->ino);
|
|
struct list_head *list = &audit_inode_hash[h];
|
|
struct audit_entry *e;
|
|
enum audit_state state;
|
|
|
|
if (list_empty(list))
|
|
return 0;
|
|
|
|
list_for_each_entry_rcu(e, list, list) {
|
|
if (audit_in_mask(&e->rule, ctx->major) &&
|
|
audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) {
|
|
ctx->current_state = state;
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* At syscall exit time, this filter is called if any audit_names have been
|
|
* collected during syscall processing. We only check rules in sublists at hash
|
|
* buckets applicable to the inode numbers in audit_names.
|
|
* Regarding audit_state, same rules apply as for audit_filter_syscall().
|
|
*/
|
|
void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
|
|
{
|
|
struct audit_names *n;
|
|
|
|
if (audit_pid && tsk->tgid == audit_pid)
|
|
return;
|
|
|
|
rcu_read_lock();
|
|
|
|
list_for_each_entry(n, &ctx->names_list, list) {
|
|
if (audit_filter_inode_name(tsk, n, ctx))
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* Transfer the audit context pointer to the caller, clearing it in the tsk's struct */
|
|
static inline struct audit_context *audit_take_context(struct task_struct *tsk,
|
|
int return_valid,
|
|
long return_code)
|
|
{
|
|
struct audit_context *context = tsk->audit_context;
|
|
|
|
if (!context)
|
|
return NULL;
|
|
context->return_valid = return_valid;
|
|
|
|
/*
|
|
* we need to fix up the return code in the audit logs if the actual
|
|
* return codes are later going to be fixed up by the arch specific
|
|
* signal handlers
|
|
*
|
|
* This is actually a test for:
|
|
* (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
|
|
* (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
|
|
*
|
|
* but is faster than a bunch of ||
|
|
*/
|
|
if (unlikely(return_code <= -ERESTARTSYS) &&
|
|
(return_code >= -ERESTART_RESTARTBLOCK) &&
|
|
(return_code != -ENOIOCTLCMD))
|
|
context->return_code = -EINTR;
|
|
else
|
|
context->return_code = return_code;
|
|
|
|
if (context->in_syscall && !context->dummy) {
|
|
audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
|
|
audit_filter_inodes(tsk, context);
|
|
}
|
|
|
|
tsk->audit_context = NULL;
|
|
return context;
|
|
}
|
|
|
|
static inline void audit_proctitle_free(struct audit_context *context)
|
|
{
|
|
kfree(context->proctitle.value);
|
|
context->proctitle.value = NULL;
|
|
context->proctitle.len = 0;
|
|
}
|
|
|
|
static inline void audit_free_names(struct audit_context *context)
|
|
{
|
|
struct audit_names *n, *next;
|
|
|
|
list_for_each_entry_safe(n, next, &context->names_list, list) {
|
|
list_del(&n->list);
|
|
if (n->name)
|
|
putname(n->name);
|
|
if (n->should_free)
|
|
kfree(n);
|
|
}
|
|
context->name_count = 0;
|
|
path_put(&context->pwd);
|
|
context->pwd.dentry = NULL;
|
|
context->pwd.mnt = NULL;
|
|
}
|
|
|
|
static inline void audit_free_aux(struct audit_context *context)
|
|
{
|
|
struct audit_aux_data *aux;
|
|
|
|
while ((aux = context->aux)) {
|
|
context->aux = aux->next;
|
|
kfree(aux);
|
|
}
|
|
while ((aux = context->aux_pids)) {
|
|
context->aux_pids = aux->next;
|
|
kfree(aux);
|
|
}
|
|
}
|
|
|
|
static inline struct audit_context *audit_alloc_context(enum audit_state state)
|
|
{
|
|
struct audit_context *context;
|
|
|
|
context = kzalloc(sizeof(*context), GFP_KERNEL);
|
|
if (!context)
|
|
return NULL;
|
|
context->state = state;
|
|
context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
|
|
INIT_LIST_HEAD(&context->killed_trees);
|
|
INIT_LIST_HEAD(&context->names_list);
|
|
return context;
|
|
}
|
|
|
|
/**
|
|
* audit_alloc - allocate an audit context block for a task
|
|
* @tsk: task
|
|
*
|
|
* Filter on the task information and allocate a per-task audit context
|
|
* if necessary. Doing so turns on system call auditing for the
|
|
* specified task. This is called from copy_process, so no lock is
|
|
* needed.
|
|
*/
|
|
int audit_alloc(struct task_struct *tsk)
|
|
{
|
|
struct audit_context *context;
|
|
enum audit_state state;
|
|
char *key = NULL;
|
|
|
|
if (likely(!audit_ever_enabled))
|
|
return 0; /* Return if not auditing. */
|
|
|
|
state = audit_filter_task(tsk, &key);
|
|
if (state == AUDIT_DISABLED) {
|
|
clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
|
|
return 0;
|
|
}
|
|
|
|
if (!(context = audit_alloc_context(state))) {
|
|
kfree(key);
|
|
audit_log_lost("out of memory in audit_alloc");
|
|
return -ENOMEM;
|
|
}
|
|
context->filterkey = key;
|
|
|
|
tsk->audit_context = context;
|
|
set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
|
|
return 0;
|
|
}
|
|
|
|
static inline void audit_free_context(struct audit_context *context)
|
|
{
|
|
audit_free_names(context);
|
|
unroll_tree_refs(context, NULL, 0);
|
|
free_tree_refs(context);
|
|
audit_free_aux(context);
|
|
kfree(context->filterkey);
|
|
kfree(context->sockaddr);
|
|
audit_proctitle_free(context);
|
|
kfree(context);
|
|
}
|
|
|
|
static int audit_log_pid_context(struct audit_context *context, pid_t pid,
|
|
kuid_t auid, kuid_t uid, unsigned int sessionid,
|
|
u32 sid, char *comm)
|
|
{
|
|
struct audit_buffer *ab;
|
|
char *ctx = NULL;
|
|
u32 len;
|
|
int rc = 0;
|
|
|
|
ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
|
|
if (!ab)
|
|
return rc;
|
|
|
|
audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
|
|
from_kuid(&init_user_ns, auid),
|
|
from_kuid(&init_user_ns, uid), sessionid);
|
|
if (sid) {
|
|
if (security_secid_to_secctx(sid, &ctx, &len)) {
|
|
audit_log_format(ab, " obj=(none)");
|
|
rc = 1;
|
|
} else {
|
|
audit_log_format(ab, " obj=%s", ctx);
|
|
security_release_secctx(ctx, len);
|
|
}
|
|
}
|
|
audit_log_format(ab, " ocomm=");
|
|
audit_log_untrustedstring(ab, comm);
|
|
audit_log_end(ab);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void audit_log_execve_info(struct audit_context *context,
|
|
struct audit_buffer **ab)
|
|
{
|
|
long len_max;
|
|
long len_rem;
|
|
long len_full;
|
|
long len_buf;
|
|
long len_abuf = 0;
|
|
long len_tmp;
|
|
bool require_data;
|
|
bool encode;
|
|
unsigned int iter;
|
|
unsigned int arg;
|
|
char *buf_head;
|
|
char *buf;
|
|
const char __user *p = (const char __user *)current->mm->arg_start;
|
|
|
|
/* NOTE: this buffer needs to be large enough to hold all the non-arg
|
|
* data we put in the audit record for this argument (see the
|
|
* code below) ... at this point in time 96 is plenty */
|
|
char abuf[96];
|
|
|
|
/* NOTE: we set MAX_EXECVE_AUDIT_LEN to a rather arbitrary limit, the
|
|
* current value of 7500 is not as important as the fact that it
|
|
* is less than 8k, a setting of 7500 gives us plenty of wiggle
|
|
* room if we go over a little bit in the logging below */
|
|
WARN_ON_ONCE(MAX_EXECVE_AUDIT_LEN > 7500);
|
|
len_max = MAX_EXECVE_AUDIT_LEN;
|
|
|
|
/* scratch buffer to hold the userspace args */
|
|
buf_head = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
|
|
if (!buf_head) {
|
|
audit_panic("out of memory for argv string");
|
|
return;
|
|
}
|
|
buf = buf_head;
|
|
|
|
audit_log_format(*ab, "argc=%d", context->execve.argc);
|
|
|
|
len_rem = len_max;
|
|
len_buf = 0;
|
|
len_full = 0;
|
|
require_data = true;
|
|
encode = false;
|
|
iter = 0;
|
|
arg = 0;
|
|
do {
|
|
/* NOTE: we don't ever want to trust this value for anything
|
|
* serious, but the audit record format insists we
|
|
* provide an argument length for really long arguments,
|
|
* e.g. > MAX_EXECVE_AUDIT_LEN, so we have no choice but
|
|
* to use strncpy_from_user() to obtain this value for
|
|
* recording in the log, although we don't use it
|
|
* anywhere here to avoid a double-fetch problem */
|
|
if (len_full == 0)
|
|
len_full = strnlen_user(p, MAX_ARG_STRLEN) - 1;
|
|
|
|
/* read more data from userspace */
|
|
if (require_data) {
|
|
/* can we make more room in the buffer? */
|
|
if (buf != buf_head) {
|
|
memmove(buf_head, buf, len_buf);
|
|
buf = buf_head;
|
|
}
|
|
|
|
/* fetch as much as we can of the argument */
|
|
len_tmp = strncpy_from_user(&buf_head[len_buf], p,
|
|
len_max - len_buf);
|
|
if (len_tmp == -EFAULT) {
|
|
/* unable to copy from userspace */
|
|
send_sig(SIGKILL, current, 0);
|
|
goto out;
|
|
} else if (len_tmp == (len_max - len_buf)) {
|
|
/* buffer is not large enough */
|
|
require_data = true;
|
|
/* NOTE: if we are going to span multiple
|
|
* buffers force the encoding so we stand
|
|
* a chance at a sane len_full value and
|
|
* consistent record encoding */
|
|
encode = true;
|
|
len_full = len_full * 2;
|
|
p += len_tmp;
|
|
} else {
|
|
require_data = false;
|
|
if (!encode)
|
|
encode = audit_string_contains_control(
|
|
buf, len_tmp);
|
|
/* try to use a trusted value for len_full */
|
|
if (len_full < len_max)
|
|
len_full = (encode ?
|
|
len_tmp * 2 : len_tmp);
|
|
p += len_tmp + 1;
|
|
}
|
|
len_buf += len_tmp;
|
|
buf_head[len_buf] = '\0';
|
|
|
|
/* length of the buffer in the audit record? */
|
|
len_abuf = (encode ? len_buf * 2 : len_buf + 2);
|
|
}
|
|
|
|
/* write as much as we can to the audit log */
|
|
if (len_buf > 0) {
|
|
/* NOTE: some magic numbers here - basically if we
|
|
* can't fit a reasonable amount of data into the
|
|
* existing audit buffer, flush it and start with
|
|
* a new buffer */
|
|
if ((sizeof(abuf) + 8) > len_rem) {
|
|
len_rem = len_max;
|
|
audit_log_end(*ab);
|
|
*ab = audit_log_start(context,
|
|
GFP_KERNEL, AUDIT_EXECVE);
|
|
if (!*ab)
|
|
goto out;
|
|
}
|
|
|
|
/* create the non-arg portion of the arg record */
|
|
len_tmp = 0;
|
|
if (require_data || (iter > 0) ||
|
|
((len_abuf + sizeof(abuf)) > len_rem)) {
|
|
if (iter == 0) {
|
|
len_tmp += snprintf(&abuf[len_tmp],
|
|
sizeof(abuf) - len_tmp,
|
|
" a%d_len=%lu",
|
|
arg, len_full);
|
|
}
|
|
len_tmp += snprintf(&abuf[len_tmp],
|
|
sizeof(abuf) - len_tmp,
|
|
" a%d[%d]=", arg, iter++);
|
|
} else
|
|
len_tmp += snprintf(&abuf[len_tmp],
|
|
sizeof(abuf) - len_tmp,
|
|
" a%d=", arg);
|
|
WARN_ON(len_tmp >= sizeof(abuf));
|
|
abuf[sizeof(abuf) - 1] = '\0';
|
|
|
|
/* log the arg in the audit record */
|
|
audit_log_format(*ab, "%s", abuf);
|
|
len_rem -= len_tmp;
|
|
len_tmp = len_buf;
|
|
if (encode) {
|
|
if (len_abuf > len_rem)
|
|
len_tmp = len_rem / 2; /* encoding */
|
|
audit_log_n_hex(*ab, buf, len_tmp);
|
|
len_rem -= len_tmp * 2;
|
|
len_abuf -= len_tmp * 2;
|
|
} else {
|
|
if (len_abuf > len_rem)
|
|
len_tmp = len_rem - 2; /* quotes */
|
|
audit_log_n_string(*ab, buf, len_tmp);
|
|
len_rem -= len_tmp + 2;
|
|
/* don't subtract the "2" because we still need
|
|
* to add quotes to the remaining string */
|
|
len_abuf -= len_tmp;
|
|
}
|
|
len_buf -= len_tmp;
|
|
buf += len_tmp;
|
|
}
|
|
|
|
/* ready to move to the next argument? */
|
|
if ((len_buf == 0) && !require_data) {
|
|
arg++;
|
|
iter = 0;
|
|
len_full = 0;
|
|
require_data = true;
|
|
encode = false;
|
|
}
|
|
} while (arg < context->execve.argc);
|
|
|
|
/* NOTE: the caller handles the final audit_log_end() call */
|
|
|
|
out:
|
|
kfree(buf_head);
|
|
}
|
|
|
|
static void show_special(struct audit_context *context, int *call_panic)
|
|
{
|
|
struct audit_buffer *ab;
|
|
int i;
|
|
|
|
ab = audit_log_start(context, GFP_KERNEL, context->type);
|
|
if (!ab)
|
|
return;
|
|
|
|
switch (context->type) {
|
|
case AUDIT_SOCKETCALL: {
|
|
int nargs = context->socketcall.nargs;
|
|
audit_log_format(ab, "nargs=%d", nargs);
|
|
for (i = 0; i < nargs; i++)
|
|
audit_log_format(ab, " a%d=%lx", i,
|
|
context->socketcall.args[i]);
|
|
break; }
|
|
case AUDIT_IPC: {
|
|
u32 osid = context->ipc.osid;
|
|
|
|
audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
|
|
from_kuid(&init_user_ns, context->ipc.uid),
|
|
from_kgid(&init_user_ns, context->ipc.gid),
|
|
context->ipc.mode);
|
|
if (osid) {
|
|
char *ctx = NULL;
|
|
u32 len;
|
|
if (security_secid_to_secctx(osid, &ctx, &len)) {
|
|
audit_log_format(ab, " osid=%u", osid);
|
|
*call_panic = 1;
|
|
} else {
|
|
audit_log_format(ab, " obj=%s", ctx);
|
|
security_release_secctx(ctx, len);
|
|
}
|
|
}
|
|
if (context->ipc.has_perm) {
|
|
audit_log_end(ab);
|
|
ab = audit_log_start(context, GFP_KERNEL,
|
|
AUDIT_IPC_SET_PERM);
|
|
if (unlikely(!ab))
|
|
return;
|
|
audit_log_format(ab,
|
|
"qbytes=%lx ouid=%u ogid=%u mode=%#ho",
|
|
context->ipc.qbytes,
|
|
context->ipc.perm_uid,
|
|
context->ipc.perm_gid,
|
|
context->ipc.perm_mode);
|
|
}
|
|
break; }
|
|
case AUDIT_MQ_OPEN:
|
|
audit_log_format(ab,
|
|
"oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld "
|
|
"mq_msgsize=%ld mq_curmsgs=%ld",
|
|
context->mq_open.oflag, context->mq_open.mode,
|
|
context->mq_open.attr.mq_flags,
|
|
context->mq_open.attr.mq_maxmsg,
|
|
context->mq_open.attr.mq_msgsize,
|
|
context->mq_open.attr.mq_curmsgs);
|
|
break;
|
|
case AUDIT_MQ_SENDRECV:
|
|
audit_log_format(ab,
|
|
"mqdes=%d msg_len=%zd msg_prio=%u "
|
|
"abs_timeout_sec=%ld abs_timeout_nsec=%ld",
|
|
context->mq_sendrecv.mqdes,
|
|
context->mq_sendrecv.msg_len,
|
|
context->mq_sendrecv.msg_prio,
|
|
context->mq_sendrecv.abs_timeout.tv_sec,
|
|
context->mq_sendrecv.abs_timeout.tv_nsec);
|
|
break;
|
|
case AUDIT_MQ_NOTIFY:
|
|
audit_log_format(ab, "mqdes=%d sigev_signo=%d",
|
|
context->mq_notify.mqdes,
|
|
context->mq_notify.sigev_signo);
|
|
break;
|
|
case AUDIT_MQ_GETSETATTR: {
|
|
struct mq_attr *attr = &context->mq_getsetattr.mqstat;
|
|
audit_log_format(ab,
|
|
"mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
|
|
"mq_curmsgs=%ld ",
|
|
context->mq_getsetattr.mqdes,
|
|
attr->mq_flags, attr->mq_maxmsg,
|
|
attr->mq_msgsize, attr->mq_curmsgs);
|
|
break; }
|
|
case AUDIT_CAPSET:
|
|
audit_log_format(ab, "pid=%d", context->capset.pid);
|
|
audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
|
|
audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
|
|
audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
|
|
break;
|
|
case AUDIT_MMAP:
|
|
audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
|
|
context->mmap.flags);
|
|
break;
|
|
case AUDIT_EXECVE:
|
|
audit_log_execve_info(context, &ab);
|
|
break;
|
|
case AUDIT_KERN_MODULE:
|
|
audit_log_format(ab, "name=");
|
|
audit_log_untrustedstring(ab, context->module.name);
|
|
kfree(context->module.name);
|
|
break;
|
|
}
|
|
audit_log_end(ab);
|
|
}
|
|
|
|
static inline int audit_proctitle_rtrim(char *proctitle, int len)
|
|
{
|
|
char *end = proctitle + len - 1;
|
|
while (end > proctitle && !isprint(*end))
|
|
end--;
|
|
|
|
/* catch the case where proctitle is only 1 non-print character */
|
|
len = end - proctitle + 1;
|
|
len -= isprint(proctitle[len-1]) == 0;
|
|
return len;
|
|
}
|
|
|
|
static void audit_log_proctitle(struct task_struct *tsk,
|
|
struct audit_context *context)
|
|
{
|
|
int res;
|
|
char *buf;
|
|
char *msg = "(null)";
|
|
int len = strlen(msg);
|
|
struct audit_buffer *ab;
|
|
|
|
ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE);
|
|
if (!ab)
|
|
return; /* audit_panic or being filtered */
|
|
|
|
audit_log_format(ab, "proctitle=");
|
|
|
|
/* Not cached */
|
|
if (!context->proctitle.value) {
|
|
buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL);
|
|
if (!buf)
|
|
goto out;
|
|
/* Historically called this from procfs naming */
|
|
res = get_cmdline(tsk, buf, MAX_PROCTITLE_AUDIT_LEN);
|
|
if (res == 0) {
|
|
kfree(buf);
|
|
goto out;
|
|
}
|
|
res = audit_proctitle_rtrim(buf, res);
|
|
if (res == 0) {
|
|
kfree(buf);
|
|
goto out;
|
|
}
|
|
context->proctitle.value = buf;
|
|
context->proctitle.len = res;
|
|
}
|
|
msg = context->proctitle.value;
|
|
len = context->proctitle.len;
|
|
out:
|
|
audit_log_n_untrustedstring(ab, msg, len);
|
|
audit_log_end(ab);
|
|
}
|
|
|
|
static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
|
|
{
|
|
int i, call_panic = 0;
|
|
struct audit_buffer *ab;
|
|
struct audit_aux_data *aux;
|
|
struct audit_names *n;
|
|
|
|
/* tsk == current */
|
|
context->personality = tsk->personality;
|
|
|
|
ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
|
|
if (!ab)
|
|
return; /* audit_panic has been called */
|
|
audit_log_format(ab, "arch=%x syscall=%d",
|
|
context->arch, context->major);
|
|
if (context->personality != PER_LINUX)
|
|
audit_log_format(ab, " per=%lx", context->personality);
|
|
if (context->return_valid)
|
|
audit_log_format(ab, " success=%s exit=%ld",
|
|
(context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
|
|
context->return_code);
|
|
|
|
audit_log_format(ab,
|
|
" a0=%lx a1=%lx a2=%lx a3=%lx items=%d",
|
|
context->argv[0],
|
|
context->argv[1],
|
|
context->argv[2],
|
|
context->argv[3],
|
|
context->name_count);
|
|
|
|
audit_log_task_info(ab, tsk);
|
|
audit_log_key(ab, context->filterkey);
|
|
audit_log_end(ab);
|
|
|
|
for (aux = context->aux; aux; aux = aux->next) {
|
|
|
|
ab = audit_log_start(context, GFP_KERNEL, aux->type);
|
|
if (!ab)
|
|
continue; /* audit_panic has been called */
|
|
|
|
switch (aux->type) {
|
|
|
|
case AUDIT_BPRM_FCAPS: {
|
|
struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
|
|
audit_log_format(ab, "fver=%x", axs->fcap_ver);
|
|
audit_log_cap(ab, "fp", &axs->fcap.permitted);
|
|
audit_log_cap(ab, "fi", &axs->fcap.inheritable);
|
|
audit_log_format(ab, " fe=%d", axs->fcap.fE);
|
|
audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
|
|
audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
|
|
audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
|
|
audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted);
|
|
audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable);
|
|
audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
|
|
break; }
|
|
|
|
}
|
|
audit_log_end(ab);
|
|
}
|
|
|
|
if (context->type)
|
|
show_special(context, &call_panic);
|
|
|
|
if (context->fds[0] >= 0) {
|
|
ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
|
|
if (ab) {
|
|
audit_log_format(ab, "fd0=%d fd1=%d",
|
|
context->fds[0], context->fds[1]);
|
|
audit_log_end(ab);
|
|
}
|
|
}
|
|
|
|
if (context->sockaddr_len) {
|
|
ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
|
|
if (ab) {
|
|
audit_log_format(ab, "saddr=");
|
|
audit_log_n_hex(ab, (void *)context->sockaddr,
|
|
context->sockaddr_len);
|
|
audit_log_end(ab);
|
|
}
|
|
}
|
|
|
|
for (aux = context->aux_pids; aux; aux = aux->next) {
|
|
struct audit_aux_data_pids *axs = (void *)aux;
|
|
|
|
for (i = 0; i < axs->pid_count; i++)
|
|
if (audit_log_pid_context(context, axs->target_pid[i],
|
|
axs->target_auid[i],
|
|
axs->target_uid[i],
|
|
axs->target_sessionid[i],
|
|
axs->target_sid[i],
|
|
axs->target_comm[i]))
|
|
call_panic = 1;
|
|
}
|
|
|
|
if (context->target_pid &&
|
|
audit_log_pid_context(context, context->target_pid,
|
|
context->target_auid, context->target_uid,
|
|
context->target_sessionid,
|
|
context->target_sid, context->target_comm))
|
|
call_panic = 1;
|
|
|
|
if (context->pwd.dentry && context->pwd.mnt) {
|
|
ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
|
|
if (ab) {
|
|
audit_log_d_path(ab, "cwd=", &context->pwd);
|
|
audit_log_end(ab);
|
|
}
|
|
}
|
|
|
|
i = 0;
|
|
list_for_each_entry(n, &context->names_list, list) {
|
|
if (n->hidden)
|
|
continue;
|
|
audit_log_name(context, n, NULL, i++, &call_panic);
|
|
}
|
|
|
|
audit_log_proctitle(tsk, context);
|
|
|
|
/* Send end of event record to help user space know we are finished */
|
|
ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
|
|
if (ab)
|
|
audit_log_end(ab);
|
|
if (call_panic)
|
|
audit_panic("error converting sid to string");
|
|
}
|
|
|
|
/**
|
|
* audit_free - free a per-task audit context
|
|
* @tsk: task whose audit context block to free
|
|
*
|
|
* Called from copy_process and do_exit
|
|
*/
|
|
void __audit_free(struct task_struct *tsk)
|
|
{
|
|
struct audit_context *context;
|
|
|
|
context = audit_take_context(tsk, 0, 0);
|
|
if (!context)
|
|
return;
|
|
|
|
/* Check for system calls that do not go through the exit
|
|
* function (e.g., exit_group), then free context block.
|
|
* We use GFP_ATOMIC here because we might be doing this
|
|
* in the context of the idle thread */
|
|
/* that can happen only if we are called from do_exit() */
|
|
if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
|
|
audit_log_exit(context, tsk);
|
|
if (!list_empty(&context->killed_trees))
|
|
audit_kill_trees(&context->killed_trees);
|
|
|
|
audit_free_context(context);
|
|
}
|
|
|
|
/**
|
|
* audit_syscall_entry - fill in an audit record at syscall entry
|
|
* @major: major syscall type (function)
|
|
* @a1: additional syscall register 1
|
|
* @a2: additional syscall register 2
|
|
* @a3: additional syscall register 3
|
|
* @a4: additional syscall register 4
|
|
*
|
|
* Fill in audit context at syscall entry. This only happens if the
|
|
* audit context was created when the task was created and the state or
|
|
* filters demand the audit context be built. If the state from the
|
|
* per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
|
|
* then the record will be written at syscall exit time (otherwise, it
|
|
* will only be written if another part of the kernel requests that it
|
|
* be written).
|
|
*/
|
|
void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
|
|
unsigned long a3, unsigned long a4)
|
|
{
|
|
struct task_struct *tsk = current;
|
|
struct audit_context *context = tsk->audit_context;
|
|
enum audit_state state;
|
|
|
|
if (!context)
|
|
return;
|
|
|
|
BUG_ON(context->in_syscall || context->name_count);
|
|
|
|
if (!audit_enabled)
|
|
return;
|
|
|
|
context->arch = syscall_get_arch();
|
|
context->major = major;
|
|
context->argv[0] = a1;
|
|
context->argv[1] = a2;
|
|
context->argv[2] = a3;
|
|
context->argv[3] = a4;
|
|
|
|
state = context->state;
|
|
context->dummy = !audit_n_rules;
|
|
if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
|
|
context->prio = 0;
|
|
state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
|
|
}
|
|
if (state == AUDIT_DISABLED)
|
|
return;
|
|
|
|
context->serial = 0;
|
|
context->ctime = CURRENT_TIME;
|
|
context->in_syscall = 1;
|
|
context->current_state = state;
|
|
context->ppid = 0;
|
|
}
|
|
|
|
/**
|
|
* audit_syscall_exit - deallocate audit context after a system call
|
|
* @success: success value of the syscall
|
|
* @return_code: return value of the syscall
|
|
*
|
|
* Tear down after system call. If the audit context has been marked as
|
|
* auditable (either because of the AUDIT_RECORD_CONTEXT state from
|
|
* filtering, or because some other part of the kernel wrote an audit
|
|
* message), then write out the syscall information. In call cases,
|
|
* free the names stored from getname().
|
|
*/
|
|
void __audit_syscall_exit(int success, long return_code)
|
|
{
|
|
struct task_struct *tsk = current;
|
|
struct audit_context *context;
|
|
|
|
if (success)
|
|
success = AUDITSC_SUCCESS;
|
|
else
|
|
success = AUDITSC_FAILURE;
|
|
|
|
context = audit_take_context(tsk, success, return_code);
|
|
if (!context)
|
|
return;
|
|
|
|
if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
|
|
audit_log_exit(context, tsk);
|
|
|
|
context->in_syscall = 0;
|
|
context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
|
|
|
|
if (!list_empty(&context->killed_trees))
|
|
audit_kill_trees(&context->killed_trees);
|
|
|
|
audit_free_names(context);
|
|
unroll_tree_refs(context, NULL, 0);
|
|
audit_free_aux(context);
|
|
context->aux = NULL;
|
|
context->aux_pids = NULL;
|
|
context->target_pid = 0;
|
|
context->target_sid = 0;
|
|
context->sockaddr_len = 0;
|
|
context->type = 0;
|
|
context->fds[0] = -1;
|
|
if (context->state != AUDIT_RECORD_CONTEXT) {
|
|
kfree(context->filterkey);
|
|
context->filterkey = NULL;
|
|
}
|
|
tsk->audit_context = context;
|
|
}
|
|
|
|
static inline void handle_one(const struct inode *inode)
|
|
{
|
|
#ifdef CONFIG_AUDIT_TREE
|
|
struct audit_context *context;
|
|
struct audit_tree_refs *p;
|
|
struct audit_chunk *chunk;
|
|
int count;
|
|
if (likely(hlist_empty(&inode->i_fsnotify_marks)))
|
|
return;
|
|
context = current->audit_context;
|
|
p = context->trees;
|
|
count = context->tree_count;
|
|
rcu_read_lock();
|
|
chunk = audit_tree_lookup(inode);
|
|
rcu_read_unlock();
|
|
if (!chunk)
|
|
return;
|
|
if (likely(put_tree_ref(context, chunk)))
|
|
return;
|
|
if (unlikely(!grow_tree_refs(context))) {
|
|
pr_warn("out of memory, audit has lost a tree reference\n");
|
|
audit_set_auditable(context);
|
|
audit_put_chunk(chunk);
|
|
unroll_tree_refs(context, p, count);
|
|
return;
|
|
}
|
|
put_tree_ref(context, chunk);
|
|
#endif
|
|
}
|
|
|
|
static void handle_path(const struct dentry *dentry)
|
|
{
|
|
#ifdef CONFIG_AUDIT_TREE
|
|
struct audit_context *context;
|
|
struct audit_tree_refs *p;
|
|
const struct dentry *d, *parent;
|
|
struct audit_chunk *drop;
|
|
unsigned long seq;
|
|
int count;
|
|
|
|
context = current->audit_context;
|
|
p = context->trees;
|
|
count = context->tree_count;
|
|
retry:
|
|
drop = NULL;
|
|
d = dentry;
|
|
rcu_read_lock();
|
|
seq = read_seqbegin(&rename_lock);
|
|
for(;;) {
|
|
struct inode *inode = d_backing_inode(d);
|
|
if (inode && unlikely(!hlist_empty(&inode->i_fsnotify_marks))) {
|
|
struct audit_chunk *chunk;
|
|
chunk = audit_tree_lookup(inode);
|
|
if (chunk) {
|
|
if (unlikely(!put_tree_ref(context, chunk))) {
|
|
drop = chunk;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
parent = d->d_parent;
|
|
if (parent == d)
|
|
break;
|
|
d = parent;
|
|
}
|
|
if (unlikely(read_seqretry(&rename_lock, seq) || drop)) { /* in this order */
|
|
rcu_read_unlock();
|
|
if (!drop) {
|
|
/* just a race with rename */
|
|
unroll_tree_refs(context, p, count);
|
|
goto retry;
|
|
}
|
|
audit_put_chunk(drop);
|
|
if (grow_tree_refs(context)) {
|
|
/* OK, got more space */
|
|
unroll_tree_refs(context, p, count);
|
|
goto retry;
|
|
}
|
|
/* too bad */
|
|
pr_warn("out of memory, audit has lost a tree reference\n");
|
|
unroll_tree_refs(context, p, count);
|
|
audit_set_auditable(context);
|
|
return;
|
|
}
|
|
rcu_read_unlock();
|
|
#endif
|
|
}
|
|
|
|
static struct audit_names *audit_alloc_name(struct audit_context *context,
|
|
unsigned char type)
|
|
{
|
|
struct audit_names *aname;
|
|
|
|
if (context->name_count < AUDIT_NAMES) {
|
|
aname = &context->preallocated_names[context->name_count];
|
|
memset(aname, 0, sizeof(*aname));
|
|
} else {
|
|
aname = kzalloc(sizeof(*aname), GFP_NOFS);
|
|
if (!aname)
|
|
return NULL;
|
|
aname->should_free = true;
|
|
}
|
|
|
|
aname->ino = AUDIT_INO_UNSET;
|
|
aname->type = type;
|
|
list_add_tail(&aname->list, &context->names_list);
|
|
|
|
context->name_count++;
|
|
return aname;
|
|
}
|
|
|
|
/**
|
|
* audit_reusename - fill out filename with info from existing entry
|
|
* @uptr: userland ptr to pathname
|
|
*
|
|
* Search the audit_names list for the current audit context. If there is an
|
|
* existing entry with a matching "uptr" then return the filename
|
|
* associated with that audit_name. If not, return NULL.
|
|
*/
|
|
struct filename *
|
|
__audit_reusename(const __user char *uptr)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
struct audit_names *n;
|
|
|
|
list_for_each_entry(n, &context->names_list, list) {
|
|
if (!n->name)
|
|
continue;
|
|
if (n->name->uptr == uptr) {
|
|
n->name->refcnt++;
|
|
return n->name;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* audit_getname - add a name to the list
|
|
* @name: name to add
|
|
*
|
|
* Add a name to the list of audit names for this context.
|
|
* Called from fs/namei.c:getname().
|
|
*/
|
|
void __audit_getname(struct filename *name)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
struct audit_names *n;
|
|
|
|
if (!context->in_syscall)
|
|
return;
|
|
|
|
n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
|
|
if (!n)
|
|
return;
|
|
|
|
n->name = name;
|
|
n->name_len = AUDIT_NAME_FULL;
|
|
name->aname = n;
|
|
name->refcnt++;
|
|
|
|
if (!context->pwd.dentry)
|
|
get_fs_pwd(current->fs, &context->pwd);
|
|
}
|
|
|
|
/**
|
|
* __audit_inode - store the inode and device from a lookup
|
|
* @name: name being audited
|
|
* @dentry: dentry being audited
|
|
* @flags: attributes for this particular entry
|
|
*/
|
|
void __audit_inode(struct filename *name, const struct dentry *dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
struct inode *inode = d_backing_inode(dentry);
|
|
struct audit_names *n;
|
|
bool parent = flags & AUDIT_INODE_PARENT;
|
|
|
|
if (!context->in_syscall)
|
|
return;
|
|
|
|
if (!name)
|
|
goto out_alloc;
|
|
|
|
/*
|
|
* If we have a pointer to an audit_names entry already, then we can
|
|
* just use it directly if the type is correct.
|
|
*/
|
|
n = name->aname;
|
|
if (n) {
|
|
if (parent) {
|
|
if (n->type == AUDIT_TYPE_PARENT ||
|
|
n->type == AUDIT_TYPE_UNKNOWN)
|
|
goto out;
|
|
} else {
|
|
if (n->type != AUDIT_TYPE_PARENT)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
list_for_each_entry_reverse(n, &context->names_list, list) {
|
|
if (n->ino) {
|
|
/* valid inode number, use that for the comparison */
|
|
if (n->ino != inode->i_ino ||
|
|
n->dev != inode->i_sb->s_dev)
|
|
continue;
|
|
} else if (n->name) {
|
|
/* inode number has not been set, check the name */
|
|
if (strcmp(n->name->name, name->name))
|
|
continue;
|
|
} else
|
|
/* no inode and no name (?!) ... this is odd ... */
|
|
continue;
|
|
|
|
/* match the correct record type */
|
|
if (parent) {
|
|
if (n->type == AUDIT_TYPE_PARENT ||
|
|
n->type == AUDIT_TYPE_UNKNOWN)
|
|
goto out;
|
|
} else {
|
|
if (n->type != AUDIT_TYPE_PARENT)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out_alloc:
|
|
/* unable to find an entry with both a matching name and type */
|
|
n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
|
|
if (!n)
|
|
return;
|
|
if (name) {
|
|
n->name = name;
|
|
name->refcnt++;
|
|
}
|
|
|
|
out:
|
|
if (parent) {
|
|
n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;
|
|
n->type = AUDIT_TYPE_PARENT;
|
|
if (flags & AUDIT_INODE_HIDDEN)
|
|
n->hidden = true;
|
|
} else {
|
|
n->name_len = AUDIT_NAME_FULL;
|
|
n->type = AUDIT_TYPE_NORMAL;
|
|
}
|
|
handle_path(dentry);
|
|
audit_copy_inode(n, dentry, inode);
|
|
}
|
|
|
|
void __audit_file(const struct file *file)
|
|
{
|
|
__audit_inode(NULL, file->f_path.dentry, 0);
|
|
}
|
|
|
|
/**
|
|
* __audit_inode_child - collect inode info for created/removed objects
|
|
* @parent: inode of dentry parent
|
|
* @dentry: dentry being audited
|
|
* @type: AUDIT_TYPE_* value that we're looking for
|
|
*
|
|
* For syscalls that create or remove filesystem objects, audit_inode
|
|
* can only collect information for the filesystem object's parent.
|
|
* This call updates the audit context with the child's information.
|
|
* Syscalls that create a new filesystem object must be hooked after
|
|
* the object is created. Syscalls that remove a filesystem object
|
|
* must be hooked prior, in order to capture the target inode during
|
|
* unsuccessful attempts.
|
|
*/
|
|
void __audit_inode_child(struct inode *parent,
|
|
const struct dentry *dentry,
|
|
const unsigned char type)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
struct inode *inode = d_backing_inode(dentry);
|
|
const char *dname = dentry->d_name.name;
|
|
struct audit_names *n, *found_parent = NULL, *found_child = NULL;
|
|
|
|
if (!context->in_syscall)
|
|
return;
|
|
|
|
if (inode)
|
|
handle_one(inode);
|
|
|
|
/* look for a parent entry first */
|
|
list_for_each_entry(n, &context->names_list, list) {
|
|
if (!n->name ||
|
|
(n->type != AUDIT_TYPE_PARENT &&
|
|
n->type != AUDIT_TYPE_UNKNOWN))
|
|
continue;
|
|
|
|
if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev &&
|
|
!audit_compare_dname_path(dname,
|
|
n->name->name, n->name_len)) {
|
|
if (n->type == AUDIT_TYPE_UNKNOWN)
|
|
n->type = AUDIT_TYPE_PARENT;
|
|
found_parent = n;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* is there a matching child entry? */
|
|
list_for_each_entry(n, &context->names_list, list) {
|
|
/* can only match entries that have a name */
|
|
if (!n->name ||
|
|
(n->type != type && n->type != AUDIT_TYPE_UNKNOWN))
|
|
continue;
|
|
|
|
if (!strcmp(dname, n->name->name) ||
|
|
!audit_compare_dname_path(dname, n->name->name,
|
|
found_parent ?
|
|
found_parent->name_len :
|
|
AUDIT_NAME_FULL)) {
|
|
if (n->type == AUDIT_TYPE_UNKNOWN)
|
|
n->type = type;
|
|
found_child = n;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found_parent) {
|
|
/* create a new, "anonymous" parent record */
|
|
n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
|
|
if (!n)
|
|
return;
|
|
audit_copy_inode(n, NULL, parent);
|
|
}
|
|
|
|
if (!found_child) {
|
|
found_child = audit_alloc_name(context, type);
|
|
if (!found_child)
|
|
return;
|
|
|
|
/* Re-use the name belonging to the slot for a matching parent
|
|
* directory. All names for this context are relinquished in
|
|
* audit_free_names() */
|
|
if (found_parent) {
|
|
found_child->name = found_parent->name;
|
|
found_child->name_len = AUDIT_NAME_FULL;
|
|
found_child->name->refcnt++;
|
|
}
|
|
}
|
|
|
|
if (inode)
|
|
audit_copy_inode(found_child, dentry, inode);
|
|
else
|
|
found_child->ino = AUDIT_INO_UNSET;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__audit_inode_child);
|
|
|
|
/**
|
|
* auditsc_get_stamp - get local copies of audit_context values
|
|
* @ctx: audit_context for the task
|
|
* @t: timespec to store time recorded in the audit_context
|
|
* @serial: serial value that is recorded in the audit_context
|
|
*
|
|
* Also sets the context as auditable.
|
|
*/
|
|
int auditsc_get_stamp(struct audit_context *ctx,
|
|
struct timespec *t, unsigned int *serial)
|
|
{
|
|
if (!ctx->in_syscall)
|
|
return 0;
|
|
if (!ctx->serial)
|
|
ctx->serial = audit_serial();
|
|
t->tv_sec = ctx->ctime.tv_sec;
|
|
t->tv_nsec = ctx->ctime.tv_nsec;
|
|
*serial = ctx->serial;
|
|
if (!ctx->prio) {
|
|
ctx->prio = 1;
|
|
ctx->current_state = AUDIT_RECORD_CONTEXT;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* global counter which is incremented every time something logs in */
|
|
static atomic_t session_id = ATOMIC_INIT(0);
|
|
|
|
static int audit_set_loginuid_perm(kuid_t loginuid)
|
|
{
|
|
/* if we are unset, we don't need privs */
|
|
if (!audit_loginuid_set(current))
|
|
return 0;
|
|
/* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/
|
|
if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE))
|
|
return -EPERM;
|
|
/* it is set, you need permission */
|
|
if (!capable(CAP_AUDIT_CONTROL))
|
|
return -EPERM;
|
|
/* reject if this is not an unset and we don't allow that */
|
|
if (is_audit_feature_set(AUDIT_FEATURE_ONLY_UNSET_LOGINUID) && uid_valid(loginuid))
|
|
return -EPERM;
|
|
return 0;
|
|
}
|
|
|
|
static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid,
|
|
unsigned int oldsessionid, unsigned int sessionid,
|
|
int rc)
|
|
{
|
|
struct audit_buffer *ab;
|
|
uid_t uid, oldloginuid, loginuid;
|
|
struct tty_struct *tty;
|
|
|
|
if (!audit_enabled)
|
|
return;
|
|
|
|
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
|
|
if (!ab)
|
|
return;
|
|
|
|
uid = from_kuid(&init_user_ns, task_uid(current));
|
|
oldloginuid = from_kuid(&init_user_ns, koldloginuid);
|
|
loginuid = from_kuid(&init_user_ns, kloginuid),
|
|
tty = audit_get_tty(current);
|
|
|
|
audit_log_format(ab, "pid=%d uid=%u", task_tgid_nr(current), uid);
|
|
audit_log_task_context(ab);
|
|
audit_log_format(ab, " old-auid=%u auid=%u tty=%s old-ses=%u ses=%u res=%d",
|
|
oldloginuid, loginuid, tty ? tty_name(tty) : "(none)",
|
|
oldsessionid, sessionid, !rc);
|
|
audit_put_tty(tty);
|
|
audit_log_end(ab);
|
|
}
|
|
|
|
/**
|
|
* audit_set_loginuid - set current task's audit_context loginuid
|
|
* @loginuid: loginuid value
|
|
*
|
|
* Returns 0.
|
|
*
|
|
* Called (set) from fs/proc/base.c::proc_loginuid_write().
|
|
*/
|
|
int audit_set_loginuid(kuid_t loginuid)
|
|
{
|
|
struct task_struct *task = current;
|
|
unsigned int oldsessionid, sessionid = (unsigned int)-1;
|
|
kuid_t oldloginuid;
|
|
int rc;
|
|
|
|
oldloginuid = audit_get_loginuid(current);
|
|
oldsessionid = audit_get_sessionid(current);
|
|
|
|
rc = audit_set_loginuid_perm(loginuid);
|
|
if (rc)
|
|
goto out;
|
|
|
|
/* are we setting or clearing? */
|
|
if (uid_valid(loginuid)) {
|
|
sessionid = (unsigned int)atomic_inc_return(&session_id);
|
|
if (unlikely(sessionid == (unsigned int)-1))
|
|
sessionid = (unsigned int)atomic_inc_return(&session_id);
|
|
}
|
|
|
|
task->sessionid = sessionid;
|
|
task->loginuid = loginuid;
|
|
out:
|
|
audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* __audit_mq_open - record audit data for a POSIX MQ open
|
|
* @oflag: open flag
|
|
* @mode: mode bits
|
|
* @attr: queue attributes
|
|
*
|
|
*/
|
|
void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
|
|
if (attr)
|
|
memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr));
|
|
else
|
|
memset(&context->mq_open.attr, 0, sizeof(struct mq_attr));
|
|
|
|
context->mq_open.oflag = oflag;
|
|
context->mq_open.mode = mode;
|
|
|
|
context->type = AUDIT_MQ_OPEN;
|
|
}
|
|
|
|
/**
|
|
* __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive
|
|
* @mqdes: MQ descriptor
|
|
* @msg_len: Message length
|
|
* @msg_prio: Message priority
|
|
* @abs_timeout: Message timeout in absolute time
|
|
*
|
|
*/
|
|
void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
|
|
const struct timespec *abs_timeout)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
struct timespec *p = &context->mq_sendrecv.abs_timeout;
|
|
|
|
if (abs_timeout)
|
|
memcpy(p, abs_timeout, sizeof(struct timespec));
|
|
else
|
|
memset(p, 0, sizeof(struct timespec));
|
|
|
|
context->mq_sendrecv.mqdes = mqdes;
|
|
context->mq_sendrecv.msg_len = msg_len;
|
|
context->mq_sendrecv.msg_prio = msg_prio;
|
|
|
|
context->type = AUDIT_MQ_SENDRECV;
|
|
}
|
|
|
|
/**
|
|
* __audit_mq_notify - record audit data for a POSIX MQ notify
|
|
* @mqdes: MQ descriptor
|
|
* @notification: Notification event
|
|
*
|
|
*/
|
|
|
|
void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
|
|
if (notification)
|
|
context->mq_notify.sigev_signo = notification->sigev_signo;
|
|
else
|
|
context->mq_notify.sigev_signo = 0;
|
|
|
|
context->mq_notify.mqdes = mqdes;
|
|
context->type = AUDIT_MQ_NOTIFY;
|
|
}
|
|
|
|
/**
|
|
* __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
|
|
* @mqdes: MQ descriptor
|
|
* @mqstat: MQ flags
|
|
*
|
|
*/
|
|
void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
context->mq_getsetattr.mqdes = mqdes;
|
|
context->mq_getsetattr.mqstat = *mqstat;
|
|
context->type = AUDIT_MQ_GETSETATTR;
|
|
}
|
|
|
|
/**
|
|
* audit_ipc_obj - record audit data for ipc object
|
|
* @ipcp: ipc permissions
|
|
*
|
|
*/
|
|
void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
context->ipc.uid = ipcp->uid;
|
|
context->ipc.gid = ipcp->gid;
|
|
context->ipc.mode = ipcp->mode;
|
|
context->ipc.has_perm = 0;
|
|
security_ipc_getsecid(ipcp, &context->ipc.osid);
|
|
context->type = AUDIT_IPC;
|
|
}
|
|
|
|
/**
|
|
* audit_ipc_set_perm - record audit data for new ipc permissions
|
|
* @qbytes: msgq bytes
|
|
* @uid: msgq user id
|
|
* @gid: msgq group id
|
|
* @mode: msgq mode (permissions)
|
|
*
|
|
* Called only after audit_ipc_obj().
|
|
*/
|
|
void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
|
|
context->ipc.qbytes = qbytes;
|
|
context->ipc.perm_uid = uid;
|
|
context->ipc.perm_gid = gid;
|
|
context->ipc.perm_mode = mode;
|
|
context->ipc.has_perm = 1;
|
|
}
|
|
|
|
void __audit_bprm(struct linux_binprm *bprm)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
|
|
context->type = AUDIT_EXECVE;
|
|
context->execve.argc = bprm->argc;
|
|
}
|
|
|
|
|
|
/**
|
|
* audit_socketcall - record audit data for sys_socketcall
|
|
* @nargs: number of args, which should not be more than AUDITSC_ARGS.
|
|
* @args: args array
|
|
*
|
|
*/
|
|
int __audit_socketcall(int nargs, unsigned long *args)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
|
|
if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
|
|
return -EINVAL;
|
|
context->type = AUDIT_SOCKETCALL;
|
|
context->socketcall.nargs = nargs;
|
|
memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __audit_fd_pair - record audit data for pipe and socketpair
|
|
* @fd1: the first file descriptor
|
|
* @fd2: the second file descriptor
|
|
*
|
|
*/
|
|
void __audit_fd_pair(int fd1, int fd2)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
context->fds[0] = fd1;
|
|
context->fds[1] = fd2;
|
|
}
|
|
|
|
/**
|
|
* audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
|
|
* @len: data length in user space
|
|
* @a: data address in kernel space
|
|
*
|
|
* Returns 0 for success or NULL context or < 0 on error.
|
|
*/
|
|
int __audit_sockaddr(int len, void *a)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
|
|
if (!context->sockaddr) {
|
|
void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
context->sockaddr = p;
|
|
}
|
|
|
|
context->sockaddr_len = len;
|
|
memcpy(context->sockaddr, a, len);
|
|
return 0;
|
|
}
|
|
|
|
void __audit_ptrace(struct task_struct *t)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
|
|
context->target_pid = task_tgid_nr(t);
|
|
context->target_auid = audit_get_loginuid(t);
|
|
context->target_uid = task_uid(t);
|
|
context->target_sessionid = audit_get_sessionid(t);
|
|
security_task_getsecid(t, &context->target_sid);
|
|
memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
|
|
}
|
|
|
|
/**
|
|
* audit_signal_info - record signal info for shutting down audit subsystem
|
|
* @sig: signal value
|
|
* @t: task being signaled
|
|
*
|
|
* If the audit subsystem is being terminated, record the task (pid)
|
|
* and uid that is doing that.
|
|
*/
|
|
int __audit_signal_info(int sig, struct task_struct *t)
|
|
{
|
|
struct audit_aux_data_pids *axp;
|
|
struct task_struct *tsk = current;
|
|
struct audit_context *ctx = tsk->audit_context;
|
|
kuid_t uid = current_uid(), t_uid = task_uid(t);
|
|
|
|
if (audit_pid && t->tgid == audit_pid) {
|
|
if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
|
|
audit_sig_pid = task_tgid_nr(tsk);
|
|
if (uid_valid(tsk->loginuid))
|
|
audit_sig_uid = tsk->loginuid;
|
|
else
|
|
audit_sig_uid = uid;
|
|
security_task_getsecid(tsk, &audit_sig_sid);
|
|
}
|
|
if (!audit_signals || audit_dummy_context())
|
|
return 0;
|
|
}
|
|
|
|
/* optimize the common case by putting first signal recipient directly
|
|
* in audit_context */
|
|
if (!ctx->target_pid) {
|
|
ctx->target_pid = task_tgid_nr(t);
|
|
ctx->target_auid = audit_get_loginuid(t);
|
|
ctx->target_uid = t_uid;
|
|
ctx->target_sessionid = audit_get_sessionid(t);
|
|
security_task_getsecid(t, &ctx->target_sid);
|
|
memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
|
|
return 0;
|
|
}
|
|
|
|
axp = (void *)ctx->aux_pids;
|
|
if (!axp || axp->pid_count == AUDIT_AUX_PIDS) {
|
|
axp = kzalloc(sizeof(*axp), GFP_ATOMIC);
|
|
if (!axp)
|
|
return -ENOMEM;
|
|
|
|
axp->d.type = AUDIT_OBJ_PID;
|
|
axp->d.next = ctx->aux_pids;
|
|
ctx->aux_pids = (void *)axp;
|
|
}
|
|
BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
|
|
|
|
axp->target_pid[axp->pid_count] = task_tgid_nr(t);
|
|
axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
|
|
axp->target_uid[axp->pid_count] = t_uid;
|
|
axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
|
|
security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
|
|
memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
|
|
axp->pid_count++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
|
|
* @bprm: pointer to the bprm being processed
|
|
* @new: the proposed new credentials
|
|
* @old: the old credentials
|
|
*
|
|
* Simply check if the proc already has the caps given by the file and if not
|
|
* store the priv escalation info for later auditing at the end of the syscall
|
|
*
|
|
* -Eric
|
|
*/
|
|
int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
|
|
const struct cred *new, const struct cred *old)
|
|
{
|
|
struct audit_aux_data_bprm_fcaps *ax;
|
|
struct audit_context *context = current->audit_context;
|
|
struct cpu_vfs_cap_data vcaps;
|
|
|
|
ax = kmalloc(sizeof(*ax), GFP_KERNEL);
|
|
if (!ax)
|
|
return -ENOMEM;
|
|
|
|
ax->d.type = AUDIT_BPRM_FCAPS;
|
|
ax->d.next = context->aux;
|
|
context->aux = (void *)ax;
|
|
|
|
get_vfs_caps_from_disk(bprm->file->f_path.dentry, &vcaps);
|
|
|
|
ax->fcap.permitted = vcaps.permitted;
|
|
ax->fcap.inheritable = vcaps.inheritable;
|
|
ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
|
|
ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
|
|
|
|
ax->old_pcap.permitted = old->cap_permitted;
|
|
ax->old_pcap.inheritable = old->cap_inheritable;
|
|
ax->old_pcap.effective = old->cap_effective;
|
|
|
|
ax->new_pcap.permitted = new->cap_permitted;
|
|
ax->new_pcap.inheritable = new->cap_inheritable;
|
|
ax->new_pcap.effective = new->cap_effective;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __audit_log_capset - store information about the arguments to the capset syscall
|
|
* @new: the new credentials
|
|
* @old: the old (current) credentials
|
|
*
|
|
* Record the arguments userspace sent to sys_capset for later printing by the
|
|
* audit system if applicable
|
|
*/
|
|
void __audit_log_capset(const struct cred *new, const struct cred *old)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
context->capset.pid = task_tgid_nr(current);
|
|
context->capset.cap.effective = new->cap_effective;
|
|
context->capset.cap.inheritable = new->cap_effective;
|
|
context->capset.cap.permitted = new->cap_permitted;
|
|
context->type = AUDIT_CAPSET;
|
|
}
|
|
|
|
void __audit_mmap_fd(int fd, int flags)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
context->mmap.fd = fd;
|
|
context->mmap.flags = flags;
|
|
context->type = AUDIT_MMAP;
|
|
}
|
|
|
|
void __audit_log_kern_module(char *name)
|
|
{
|
|
struct audit_context *context = current->audit_context;
|
|
|
|
context->module.name = kmalloc(strlen(name) + 1, GFP_KERNEL);
|
|
strcpy(context->module.name, name);
|
|
context->type = AUDIT_KERN_MODULE;
|
|
}
|
|
|
|
static void audit_log_task(struct audit_buffer *ab)
|
|
{
|
|
kuid_t auid, uid;
|
|
kgid_t gid;
|
|
unsigned int sessionid;
|
|
char comm[sizeof(current->comm)];
|
|
|
|
auid = audit_get_loginuid(current);
|
|
sessionid = audit_get_sessionid(current);
|
|
current_uid_gid(&uid, &gid);
|
|
|
|
audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
|
|
from_kuid(&init_user_ns, auid),
|
|
from_kuid(&init_user_ns, uid),
|
|
from_kgid(&init_user_ns, gid),
|
|
sessionid);
|
|
audit_log_task_context(ab);
|
|
audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
|
|
audit_log_untrustedstring(ab, get_task_comm(comm, current));
|
|
audit_log_d_path_exe(ab, current->mm);
|
|
}
|
|
|
|
/**
|
|
* audit_core_dumps - record information about processes that end abnormally
|
|
* @signr: signal value
|
|
*
|
|
* If a process ends with a core dump, something fishy is going on and we
|
|
* should record the event for investigation.
|
|
*/
|
|
void audit_core_dumps(long signr)
|
|
{
|
|
struct audit_buffer *ab;
|
|
|
|
if (!audit_enabled)
|
|
return;
|
|
|
|
if (signr == SIGQUIT) /* don't care for those */
|
|
return;
|
|
|
|
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
|
|
if (unlikely(!ab))
|
|
return;
|
|
audit_log_task(ab);
|
|
audit_log_format(ab, " sig=%ld res=1", signr);
|
|
audit_log_end(ab);
|
|
}
|
|
|
|
void __audit_seccomp(unsigned long syscall, long signr, int code)
|
|
{
|
|
struct audit_buffer *ab;
|
|
|
|
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_SECCOMP);
|
|
if (unlikely(!ab))
|
|
return;
|
|
audit_log_task(ab);
|
|
audit_log_format(ab, " sig=%ld arch=%x syscall=%ld compat=%d ip=0x%lx code=0x%x",
|
|
signr, syscall_get_arch(), syscall,
|
|
in_compat_syscall(), KSTK_EIP(current), code);
|
|
audit_log_end(ab);
|
|
}
|
|
|
|
struct list_head *audit_killed_trees(void)
|
|
{
|
|
struct audit_context *ctx = current->audit_context;
|
|
if (likely(!ctx || !ctx->in_syscall))
|
|
return NULL;
|
|
return &ctx->killed_trees;
|
|
}
|