Add auditing support to bash

This is based on earlier (unaccepted) patch to add auditing
support which wasd done by Steve Grubb at Redhat.

This patch  depends on audit 1.4 to provide a logging function.
The resulting audit message looks like this:

time->Tue Jan 30 18:23:45 2007
type=USER_CMD msg=audit(1170199425.793:143): user pid=22862 uid=0 auid=0
subj=system_u:system_r:unconfined_t:s0-s0:c0.c1023
msg='cwd=2F726F6F742F7465737420646972 cmd=6C73202D6C (terminal=tty1
res=success)'

Which translates to:

type=USER_CMD msg=audit(01/30/2007 18:23:45.793:143) : user pid=22862 uid=root
auid=root subj=system_u:system_r:unconfined_t:s0-s0:c0.c1023
msg='cwd=/root/test dir cmd=ls -l (terminal=tty1 res=success)'

This patch causes bash to log all command line arguments when the shell
is started as aubash or "bash --audit". The preferred methos is to make a
symlink frp, bash to aubash and then add aubash to /etc/shells. Then you
can change root's shell to aubash.

1 files changed, 30 insertions, 0 deletions

diff --git a/shell.c b/shell.c
index b8dcf32..b417d24 100644
--- a/shell.c
+++ b/shell.c
@@ -236,6 +236,9 @@ struct {
 #if defined (RESTRICTED_SHELL)
   { "restricted", Int, &restricted, (char **)0x0 },
 #endif
+#if defined (AUDIT_SHELL)
+  { "audit", Int, &audited, (char **)0x0 },
+#endif
   { "verbose", Int, &echo_input_at_read, (char **)0x0 },
   { "version", Int, &do_version, (char **)0x0 },
   { "wordexp", Int, &wordexp_only, (char **)0x0 },
@@ -633,6 +636,10 @@ main (argc, argv, env)
     maybe_make_restricted (shell_name);
 #endif /* RESTRICTED_SHELL */
 
+#if defined (AUDIT_SHELL)
+    maybe_make_audited (shell_name);
+#endif
+
   if (wordexp_only)
     {
       startup_state = 3;
@@ -1132,6 +1139,29 @@ maybe_make_restricted (name)
 }
 #endif /* RESTRICTED_SHELL */
 
+#if defined (AUDIT_SHELL)
+/* Perhaps make this shell an `audited' one, based on NAME.  If the
+   basename of NAME is "aubash", then this shell is audited.  The
+   name of the audited shell is a configurable option, see config.h.
+   In an audited shell, all actions performed by root will be logged
+   to the audit system.
+   Do this also if `audited' is already set to 1 maybe the shell was
+   started with --audit. */
+int
+maybe_make_audited (name)
+     char *name;
+{
+  char *temp;
+
+  temp = base_pathname (name);
+  if (*temp == '-')
+    temp++;
+  if (audited || (STREQ (temp, AUDIT_SHELL_NAME)))
+    audited = 1;
+  return (audited);
+}
+#endif /* AUDIT_SHELL */
+
 /* Fetch the current set of uids and gids and return 1 if we're running
    setuid or setgid. */
 static int