338 lines
10 KiB
C
338 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* audit -- definition of audit_context structure and supporting types
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*
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* Copyright 2003-2004 Red Hat, Inc.
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* Copyright 2005 Hewlett-Packard Development Company, L.P.
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* Copyright 2005 IBM Corporation
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*/
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#include <linux/fs.h>
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#include <linux/audit.h>
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#include <linux/skbuff.h>
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#include <uapi/linux/mqueue.h>
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#include <linux/tty.h>
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/* AUDIT_NAMES is the number of slots we reserve in the audit_context
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* for saving names from getname(). If we get more names we will allocate
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* a name dynamically and also add those to the list anchored by names_list. */
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#define AUDIT_NAMES 5
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/* At task start time, the audit_state is set in the audit_context using
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a per-task filter. At syscall entry, the audit_state is augmented by
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the syscall filter. */
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enum audit_state {
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AUDIT_DISABLED, /* Do not create per-task audit_context.
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* No syscall-specific audit records can
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* be generated. */
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AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
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* and fill it in at syscall
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* entry time. This makes a full
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* syscall record available if some
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* other part of the kernel decides it
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* should be recorded. */
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AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
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* always fill it in at syscall entry
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* time, and always write out the audit
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* record at syscall exit time. */
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};
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/* Rule lists */
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struct audit_watch;
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struct audit_fsnotify_mark;
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struct audit_tree;
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struct audit_chunk;
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struct audit_entry {
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struct list_head list;
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struct rcu_head rcu;
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struct audit_krule rule;
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};
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struct audit_cap_data {
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kernel_cap_t permitted;
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kernel_cap_t inheritable;
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union {
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unsigned int fE; /* effective bit of file cap */
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kernel_cap_t effective; /* effective set of process */
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};
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kernel_cap_t ambient;
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kuid_t rootid;
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};
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/* When fs/namei.c:getname() is called, we store the pointer in name and bump
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* the refcnt in the associated filename struct.
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*
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* Further, in fs/namei.c:path_lookup() we store the inode and device.
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*/
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struct audit_names {
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struct list_head list; /* audit_context->names_list */
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struct filename *name;
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int name_len; /* number of chars to log */
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bool hidden; /* don't log this record */
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unsigned long ino;
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dev_t dev;
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umode_t mode;
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kuid_t uid;
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kgid_t gid;
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dev_t rdev;
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u32 osid;
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struct audit_cap_data fcap;
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unsigned int fcap_ver;
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unsigned char type; /* record type */
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/*
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* This was an allocated audit_names and not from the array of
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* names allocated in the task audit context. Thus this name
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* should be freed on syscall exit.
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*/
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bool should_free;
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};
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struct audit_proctitle {
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int len; /* length of the cmdline field. */
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char *value; /* the cmdline field */
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};
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/* The per-task audit context. */
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struct audit_context {
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int dummy; /* must be the first element */
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int in_syscall; /* 1 if task is in a syscall */
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enum audit_state state, current_state;
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unsigned int serial; /* serial number for record */
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int major; /* syscall number */
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struct timespec64 ctime; /* time of syscall entry */
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unsigned long argv[4]; /* syscall arguments */
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long return_code;/* syscall return code */
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u64 prio;
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int return_valid; /* return code is valid */
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/*
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* The names_list is the list of all audit_names collected during this
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* syscall. The first AUDIT_NAMES entries in the names_list will
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* actually be from the preallocated_names array for performance
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* reasons. Except during allocation they should never be referenced
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* through the preallocated_names array and should only be found/used
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* by running the names_list.
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*/
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struct audit_names preallocated_names[AUDIT_NAMES];
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int name_count; /* total records in names_list */
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struct list_head names_list; /* struct audit_names->list anchor */
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char *filterkey; /* key for rule that triggered record */
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struct path pwd;
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struct audit_aux_data *aux;
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struct audit_aux_data *aux_pids;
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struct sockaddr_storage *sockaddr;
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size_t sockaddr_len;
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/* Save things to print about task_struct */
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pid_t pid, ppid;
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kuid_t uid, euid, suid, fsuid;
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kgid_t gid, egid, sgid, fsgid;
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unsigned long personality;
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int arch;
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pid_t target_pid;
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kuid_t target_auid;
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kuid_t target_uid;
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unsigned int target_sessionid;
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u32 target_sid;
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char target_comm[TASK_COMM_LEN];
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struct audit_tree_refs *trees, *first_trees;
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struct list_head killed_trees;
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int tree_count;
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int type;
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union {
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struct {
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int nargs;
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long args[6];
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} socketcall;
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struct {
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kuid_t uid;
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kgid_t gid;
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umode_t mode;
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u32 osid;
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int has_perm;
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uid_t perm_uid;
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gid_t perm_gid;
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umode_t perm_mode;
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unsigned long qbytes;
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} ipc;
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struct {
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mqd_t mqdes;
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struct mq_attr mqstat;
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} mq_getsetattr;
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struct {
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mqd_t mqdes;
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int sigev_signo;
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} mq_notify;
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struct {
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mqd_t mqdes;
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size_t msg_len;
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unsigned int msg_prio;
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struct timespec64 abs_timeout;
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} mq_sendrecv;
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struct {
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int oflag;
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umode_t mode;
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struct mq_attr attr;
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} mq_open;
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struct {
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pid_t pid;
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struct audit_cap_data cap;
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} capset;
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struct {
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int fd;
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int flags;
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} mmap;
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struct {
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int argc;
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} execve;
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struct {
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char *name;
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} module;
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};
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int fds[2];
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struct audit_proctitle proctitle;
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};
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extern bool audit_ever_enabled;
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extern void audit_log_session_info(struct audit_buffer *ab);
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extern int auditd_test_task(struct task_struct *task);
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#define AUDIT_INODE_BUCKETS 32
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extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
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static inline int audit_hash_ino(u32 ino)
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{
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return (ino & (AUDIT_INODE_BUCKETS-1));
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}
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/* Indicates that audit should log the full pathname. */
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#define AUDIT_NAME_FULL -1
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extern int audit_match_class(int class, unsigned syscall);
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extern int audit_comparator(const u32 left, const u32 op, const u32 right);
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extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
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extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
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extern int parent_len(const char *path);
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extern int audit_compare_dname_path(const struct qstr *dname, const char *path, int plen);
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extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
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const void *payload, int size);
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extern void audit_panic(const char *message);
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struct audit_netlink_list {
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__u32 portid;
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struct net *net;
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struct sk_buff_head q;
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};
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int audit_send_list(void *_dest);
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extern int selinux_audit_rule_update(void);
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extern struct mutex audit_filter_mutex;
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extern int audit_del_rule(struct audit_entry *entry);
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extern void audit_free_rule_rcu(struct rcu_head *head);
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extern struct list_head audit_filter_list[];
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extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
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extern void audit_log_d_path_exe(struct audit_buffer *ab,
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struct mm_struct *mm);
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extern struct tty_struct *audit_get_tty(void);
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extern void audit_put_tty(struct tty_struct *tty);
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/* audit watch/mark/tree functions */
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#ifdef CONFIG_AUDITSYSCALL
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extern unsigned int audit_serial(void);
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extern int auditsc_get_stamp(struct audit_context *ctx,
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struct timespec64 *t, unsigned int *serial);
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extern void audit_put_watch(struct audit_watch *watch);
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extern void audit_get_watch(struct audit_watch *watch);
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extern int audit_to_watch(struct audit_krule *krule, char *path, int len,
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u32 op);
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extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
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extern void audit_remove_watch_rule(struct audit_krule *krule);
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extern char *audit_watch_path(struct audit_watch *watch);
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extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino,
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dev_t dev);
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extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
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char *pathname, int len);
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extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
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extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
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extern void audit_remove_mark_rule(struct audit_krule *krule);
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extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
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unsigned long ino, dev_t dev);
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extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
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extern int audit_exe_compare(struct task_struct *tsk,
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struct audit_fsnotify_mark *mark);
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extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
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extern void audit_put_chunk(struct audit_chunk *chunk);
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extern bool audit_tree_match(struct audit_chunk *chunk,
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struct audit_tree *tree);
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extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
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extern int audit_add_tree_rule(struct audit_krule *rule);
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extern int audit_remove_tree_rule(struct audit_krule *rule);
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extern void audit_trim_trees(void);
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extern int audit_tag_tree(char *old, char *new);
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extern const char *audit_tree_path(struct audit_tree *tree);
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extern void audit_put_tree(struct audit_tree *tree);
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extern void audit_kill_trees(struct audit_context *context);
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extern int audit_signal_info_syscall(struct task_struct *t);
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extern void audit_filter_inodes(struct task_struct *tsk,
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struct audit_context *ctx);
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extern struct list_head *audit_killed_trees(void);
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#else /* CONFIG_AUDITSYSCALL */
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#define auditsc_get_stamp(c, t, s) 0
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#define audit_put_watch(w) {}
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#define audit_get_watch(w) {}
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#define audit_to_watch(k, p, l, o) (-EINVAL)
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#define audit_add_watch(k, l) (-EINVAL)
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#define audit_remove_watch_rule(k) BUG()
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#define audit_watch_path(w) ""
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#define audit_watch_compare(w, i, d) 0
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#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
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#define audit_mark_path(m) ""
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#define audit_remove_mark(m)
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#define audit_remove_mark_rule(k)
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#define audit_mark_compare(m, i, d) 0
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#define audit_exe_compare(t, m) (-EINVAL)
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#define audit_dupe_exe(n, o) (-EINVAL)
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#define audit_remove_tree_rule(rule) BUG()
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#define audit_add_tree_rule(rule) -EINVAL
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#define audit_make_tree(rule, str, op) -EINVAL
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#define audit_trim_trees() (void)0
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#define audit_put_tree(tree) (void)0
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#define audit_tag_tree(old, new) -EINVAL
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#define audit_tree_path(rule) "" /* never called */
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#define audit_kill_trees(context) BUG()
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static inline int audit_signal_info_syscall(struct task_struct *t)
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{
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return 0;
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}
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#define audit_filter_inodes(t, c) AUDIT_DISABLED
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#endif /* CONFIG_AUDITSYSCALL */
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extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
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extern pid_t audit_sig_pid;
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extern kuid_t audit_sig_uid;
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extern u32 audit_sig_sid;
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extern int audit_filter(int msgtype, unsigned int listtype);
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extern void audit_ctl_lock(void);
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extern void audit_ctl_unlock(void);
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