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[AUDIT] add session id to audit messages 

In order to correlate audit records to an individual login add a session
id.  This is incremented every time a user logs in and is included in
almost all messages which currently output the auid.  The field is
labeled ses=  or oses=

Signed-off-by: Eric Paris <eparis@redhat.com>
hifive-unleashed-5.1
Eric Paris 2008-01-08 10:06:53 -05:00 committed by Al Viro
parent c2a7780efe
commit 4746ec5b01
8 changed files with 61 additions and 26 deletions
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18
drivers/char/tty_audit.c
View File

@ -73,6 +73,7 @@ static void tty_audit_buf_put(struct tty_audit_buf *buf)
* @tsk with @loginuid. @buf->mutex must be locked.
*/
static void tty_audit_buf_push(struct task_struct *tsk, uid_t loginuid,
unsigned int sessionid,
struct tty_audit_buf *buf)
{
struct audit_buffer *ab;
@ -85,9 +86,9 @@ static void tty_audit_buf_push(struct task_struct *tsk, uid_t loginuid,
if (ab) {
char name[sizeof(tsk->comm)];
audit_log_format(ab, "tty pid=%u uid=%u auid=%u major=%d "
"minor=%d comm=", tsk->pid, tsk->uid,
loginuid, buf->major, buf->minor);
audit_log_format(ab, "tty pid=%u uid=%u auid=%u ses=%u "
"major=%d minor=%d comm=", tsk->pid, tsk->uid,
loginuid, sessionid, buf->major, buf->minor);
get_task_comm(name, tsk);
audit_log_untrustedstring(ab, name);
audit_log_format(ab, " data=");
@ -105,7 +106,9 @@ static void tty_audit_buf_push(struct task_struct *tsk, uid_t loginuid,
*/
static void tty_audit_buf_push_current(struct tty_audit_buf *buf)
{
tty_audit_buf_push(current, audit_get_loginuid(current), buf);
uid_t auid = audit_get_loginuid(current);
unsigned int sessionid = audit_get_sessionid(current);
tty_audit_buf_push(current, auid, sessionid, buf);
}
/**
@ -151,6 +154,11 @@ void tty_audit_fork(struct signal_struct *sig)
void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid)
{
struct tty_audit_buf *buf;
/* FIXME I think this is correct. Check against netlink once that is
* I really need to read this code more closely. But that's for
* another patch.
*/
unsigned int sessionid = audit_get_sessionid(tsk);
spin_lock_irq(&tsk->sighand->siglock);
buf = tsk->signal->tty_audit_buf;
@ -161,7 +169,7 @@ void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid)
return;
mutex_lock(&buf->mutex);
tty_audit_buf_push(tsk, loginuid, buf);
tty_audit_buf_push(tsk, loginuid, sessionid, buf);
mutex_unlock(&buf->mutex);
tty_audit_buf_put(buf);

2
include/linux/audit.h
View File

@ -410,6 +410,7 @@ extern void auditsc_get_stamp(struct audit_context *ctx,
struct timespec *t, unsigned int *serial);
extern int audit_set_loginuid(struct task_struct *task, uid_t loginuid);
#define audit_get_loginuid(t) ((t)->loginuid)
#define audit_get_sessionid(t) ((t)->sessionid)
extern void audit_log_task_context(struct audit_buffer *ab);
extern int __audit_ipc_obj(struct kern_ipc_perm *ipcp);
extern int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode);
@ -489,6 +490,7 @@ extern int audit_signals;
#define audit_core_dumps(i) do { ; } while (0)
#define auditsc_get_stamp(c,t,s) do { BUG(); } while (0)
#define audit_get_loginuid(t) (-1)
#define audit_get_sessionid(t) (-1)
#define audit_log_task_context(b) do { ; } while (0)
#define audit_ipc_obj(i) ({ 0; })
#define audit_ipc_set_perm(q,u,g,m) ({ 0; })

3
include/linux/init_task.h
View File

@ -116,7 +116,8 @@ extern struct group_info init_groups;
#ifdef CONFIG_AUDITSYSCALL
#define INIT_IDS \
.loginuid = -1,
.loginuid = -1, \
.sessionid = -1,
#else
#define INIT_IDS
#endif

1
include/linux/sched.h
View File

@ -1141,6 +1141,7 @@ struct task_struct {
struct audit_context *audit_context;
#ifdef CONFIG_AUDITSYSCALL
uid_t loginuid;
unsigned int sessionid;
#endif
seccomp_t seccomp;

36
kernel/auditsc.c
View File

@ -178,6 +178,7 @@ struct audit_aux_data_pids {
pid_t target_pid[AUDIT_AUX_PIDS];
uid_t target_auid[AUDIT_AUX_PIDS];
uid_t target_uid[AUDIT_AUX_PIDS];
unsigned int target_sessionid[AUDIT_AUX_PIDS];
u32 target_sid[AUDIT_AUX_PIDS];
char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
int pid_count;
@ -219,6 +220,7 @@ struct audit_context {
pid_t target_pid;
uid_t target_auid;
uid_t target_uid;
unsigned int target_sessionid;
u32 target_sid;
char target_comm[TASK_COMM_LEN];
@ -936,7 +938,8 @@ static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk
}
static int audit_log_pid_context(struct audit_context *context, pid_t pid,
uid_t auid, uid_t uid, u32 sid, char *comm)
uid_t auid, uid_t uid, unsigned int sessionid,
u32 sid, char *comm)
{
struct audit_buffer *ab;
char *s = NULL;
@ -947,7 +950,8 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid,
if (!ab)
return 1;
audit_log_format(ab, "opid=%d oauid=%d ouid=%d", pid, auid, uid);
audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, auid,
uid, sessionid);
if (selinux_sid_to_string(sid, &s, &len)) {
audit_log_format(ab, " obj=(none)");
rc = 1;
@ -1056,7 +1060,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
" a0=%lx a1=%lx a2=%lx a3=%lx items=%d"
" ppid=%d pid=%d auid=%u uid=%u gid=%u"
" euid=%u suid=%u fsuid=%u"
" egid=%u sgid=%u fsgid=%u tty=%s",
" egid=%u sgid=%u fsgid=%u tty=%s ses=%u",
context->argv[0],
context->argv[1],
context->argv[2],
@ -1068,7 +1072,8 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
context->uid,
context->gid,
context->euid, context->suid, context->fsuid,
context->egid, context->sgid, context->fsgid, tty);
context->egid, context->sgid, context->fsgid, tty,
tsk->sessionid);
mutex_unlock(&tty_mutex);
@ -1187,6 +1192,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
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;
@ -1195,6 +1201,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
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;
@ -1787,6 +1794,9 @@ void auditsc_get_stamp(struct audit_context *ctx,
ctx->auditable = 1;
}
/* global counter which is incremented every time something logs in */
static atomic_t session_id = ATOMIC_INIT(0);
/**
* audit_set_loginuid - set a task's audit_context loginuid
* @task: task whose audit context is being modified
@ -1798,6 +1808,7 @@ void auditsc_get_stamp(struct audit_context *ctx,
*/
int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
{
unsigned int sessionid = atomic_inc_return(&session_id);
struct audit_context *context = task->audit_context;
if (context && context->in_syscall) {
@ -1806,12 +1817,15 @@ int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
if (ab) {
audit_log_format(ab, "login pid=%d uid=%u "
"old auid=%u new auid=%u",
"old auid=%u new auid=%u"
" old ses=%u new ses=%u",
task->pid, task->uid,
task->loginuid, loginuid);
task->loginuid, loginuid,
task->sessionid, sessionid);
audit_log_end(ab);
}
}
task->sessionid = sessionid;
task->loginuid = loginuid;
return 0;
}
@ -2200,6 +2214,7 @@ void __audit_ptrace(struct task_struct *t)
context->target_pid = t->pid;
context->target_auid = audit_get_loginuid(t);
context->target_uid = t->uid;
context->target_sessionid = audit_get_sessionid(t);
selinux_get_task_sid(t, &context->target_sid);
memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
}
@ -2240,6 +2255,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
ctx->target_pid = t->tgid;
ctx->target_auid = audit_get_loginuid(t);
ctx->target_uid = t->uid;
ctx->target_sessionid = audit_get_sessionid(t);
selinux_get_task_sid(t, &ctx->target_sid);
memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
return 0;
@ -2260,6 +2276,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
axp->target_pid[axp->pid_count] = t->tgid;
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);
selinux_get_task_sid(t, &axp->target_sid[axp->pid_count]);
memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
axp->pid_count++;
@ -2278,6 +2295,8 @@ void audit_core_dumps(long signr)
{
struct audit_buffer *ab;
u32 sid;
uid_t auid = audit_get_loginuid(current);
unsigned int sessionid = audit_get_sessionid(current);
if (!audit_enabled)
return;
@ -2286,9 +2305,8 @@ void audit_core_dumps(long signr)
return;
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
audit_log_format(ab, "auid=%u uid=%u gid=%u",
audit_get_loginuid(current),
current->uid, current->gid);
audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
auid, current->uid, current->gid, sessionid);
selinux_get_task_sid(current, &sid);
if (sid) {
char *ctx = NULL;

5
net/core/dev.c
View File

@ -2754,10 +2754,11 @@ static void __dev_set_promiscuity(struct net_device *dev, int inc)
"left");
audit_log(current->audit_context, GFP_ATOMIC,
AUDIT_ANOM_PROMISCUOUS,
"dev=%s prom=%d old_prom=%d auid=%u",
"dev=%s prom=%d old_prom=%d auid=%u ses=%u",
dev->name, (dev->flags & IFF_PROMISC),
(old_flags & IFF_PROMISC),
audit_get_loginuid(current));
audit_get_loginuid(current),
audit_get_sessionid(current));
if (dev->change_rx_flags)
dev->change_rx_flags(dev, IFF_PROMISC);

17
security/selinux/selinuxfs.c
View File

@ -172,9 +172,10 @@ static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
if (length)
goto out;
audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
"enforcing=%d old_enforcing=%d auid=%u", new_value,
selinux_enforcing,
audit_get_loginuid(current));
"enforcing=%d old_enforcing=%d auid=%u ses=%u",
new_value, selinux_enforcing,
audit_get_loginuid(current),
audit_get_sessionid(current));
selinux_enforcing = new_value;
if (selinux_enforcing)
avc_ss_reset(0);
@ -243,8 +244,9 @@ static ssize_t sel_write_disable(struct file * file, const char __user * buf,
if (length < 0)
goto out;
audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
"selinux=0 auid=%u",
audit_get_loginuid(current));
"selinux=0 auid=%u ses=%u",
audit_get_loginuid(current),
audit_get_sessionid(current));
}
length = count;
@ -356,8 +358,9 @@ out1:
(security_get_allow_unknown() ? "allow" : "deny")));
audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
"policy loaded auid=%u",
audit_get_loginuid(current));
"policy loaded auid=%u ses=%u",
audit_get_loginuid(current),
audit_get_sessionid(current));
out:
mutex_unlock(&sel_mutex);
vfree(data);

5
security/selinux/ss/services.c
View File

@ -1905,11 +1905,12 @@ int security_set_bools(int len, int *values)
if (!!values[i] != policydb.bool_val_to_struct[i]->state) {
audit_log(current->audit_context, GFP_ATOMIC,
AUDIT_MAC_CONFIG_CHANGE,
"bool=%s val=%d old_val=%d auid=%u",
"bool=%s val=%d old_val=%d auid=%u ses=%u",
policydb.p_bool_val_to_name[i],
!!values[i],
policydb.bool_val_to_struct[i]->state,
audit_get_loginuid(current));
audit_get_loginuid(current),
audit_get_sessionid(current));
}
if (values[i]) {
policydb.bool_val_to_struct[i]->state = 1;