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audit: add an option to control logging of passwords with pam_tty_audit

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Most commands are entered one line at a time and processed as complete lines
in non-canonical mode.  Commands that interactively require a password, enter
canonical mode to do this while shutting off echo.  This pair of features
(icanon and !echo) can be used to avoid logging passwords by audit while still
logging the rest of the command.

Adding a member (log_passwd) to the struct audit_tty_status passed in by
pam_tty_audit allows control of canonical mode without echo per task.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Richard Guy Briggs 2013-05-03 14:03:50 -04:00 committed by Eric Paris
parent bde02ca858
commit 46e959ea29
4 changed files with 22 additions and 7 deletions
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9
drivers/tty/tty_audit.c
View File

@ -138,6 +138,7 @@ void tty_audit_fork(struct signal_struct *sig)
spin_lock_irqsave(&current->sighand->siglock, flags);
sig->audit_tty = current->signal->audit_tty;
sig->audit_tty_log_passwd = current->signal->audit_tty_log_passwd;
spin_unlock_irqrestore(&current->sighand->siglock, flags);
}
@ -275,10 +276,18 @@ void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
{
struct tty_audit_buf *buf;
int major, minor;
int audit_log_tty_passwd;
unsigned long flags;
if (unlikely(size == 0))
return;
spin_lock_irqsave(&current->sighand->siglock, flags);
audit_log_tty_passwd = current->signal->audit_tty_log_passwd;
spin_unlock_irqrestore(&current->sighand->siglock, flags);
if (!audit_log_tty_passwd && icanon && !L_ECHO(tty))
return;
if (tty->driver->type == TTY_DRIVER_TYPE_PTY
&& tty->driver->subtype == PTY_TYPE_MASTER)
return;

1
include/linux/sched.h
View File

@ -641,6 +641,7 @@ struct signal_struct {
#endif
#ifdef CONFIG_AUDIT
unsigned audit_tty;
unsigned audit_tty_log_passwd;
struct tty_audit_buf *tty_audit_buf;
#endif
#ifdef CONFIG_CGROUPS

1
include/uapi/linux/audit.h
View File

@ -370,6 +370,7 @@ struct audit_status {
struct audit_tty_status {
__u32 enabled; /* 1 = enabled, 0 = disabled */
__u32 log_passwd; /* 1 = enabled, 0 = disabled */
};
/* audit_rule_data supports filter rules with both integer and string

16
kernel/audit.c
View File

@ -49,6 +49,7 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/kthread.h>
#include <linux/kernel.h>
#include <linux/audit.h>
@ -808,6 +809,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
spin_lock_irqsave(&tsk->sighand->siglock, flags);
s.enabled = tsk->signal->audit_tty != 0;
s.log_passwd = tsk->signal->audit_tty_log_passwd;
spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
audit_send_reply(NETLINK_CB(skb).portid, seq,
@ -815,18 +817,20 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
break;
}
case AUDIT_TTY_SET: {
struct audit_tty_status *s;
struct audit_tty_status s;
struct task_struct *tsk = current;
unsigned long flags;
if (nlh->nlmsg_len < sizeof(struct audit_tty_status))
return -EINVAL;
s = data;
if (s->enabled != 0 && s->enabled != 1)
memset(&s, 0, sizeof(s));
/* guard against past and future API changes */
memcpy(&s, data, min(sizeof(s), (size_t)nlh->nlmsg_len));
if ((s.enabled != 0 && s.enabled != 1) ||
(s.log_passwd != 0 && s.log_passwd != 1))
return -EINVAL;
spin_lock_irqsave(&tsk->sighand->siglock, flags);
tsk->signal->audit_tty = s->enabled != 0;
tsk->signal->audit_tty = s.enabled;
tsk->signal->audit_tty_log_passwd = s.log_passwd;
spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
break;
}