From mboxrd@z Thu Jan 1 00:00:00 1970 From: hsultan@thefroid.net Subject: audit not catching accept call from a 64bit sshd Date: Tue, 13 Jan 2015 15:16:25 -0800 Message-ID: <6b381fe7ad225e2235c06ebadbc82c88@thefroid.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from mx1.redhat.com (ext-mx15.extmail.prod.ext.phx2.redhat.com [10.5.110.20]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t0DNGRV9010214 for ; Tue, 13 Jan 2015 18:16:27 -0500 Received: from homiemail-a79.g.dreamhost.com (sub5.mail.dreamhost.com [208.113.200.129]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id t0DNGPOs022972 for ; Tue, 13 Jan 2015 18:16:25 -0500 Received: from homiemail-a79.g.dreamhost.com (localhost [127.0.0.1]) by homiemail-a79.g.dreamhost.com (Postfix) with ESMTP id A19377D406F for ; Tue, 13 Jan 2015 15:16:25 -0800 (PST) Received: from webmail.thefroid.net (caiajhbihbdd.dreamhost.com [208.97.187.133]) (Authenticated sender: hsultan@thefroid.net) by homiemail-a79.g.dreamhost.com (Postfix) with ESMTPA id 841777D406E for ; Tue, 13 Jan 2015 15:16:25 -0800 (PST) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-audit-bounces@redhat.com Errors-To: linux-audit-bounces@redhat.com To: linux-audit@redhat.com List-Id: linux-audit@redhat.com Hi, So I'm a bit dumbfounded by what I'm seeing on my Ubuntu 14.04 Server LTS : ubuntu@ip-172-31-37-137:~/test$ sudo netstat -anop |grep sshd tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1406/sshd off (0.00/0/0) Using file I verified that it's a 64bit process : ubuntu@ip-172-31-37-137:~/test$ file /usr/sbin/sshd /usr/sbin/sshd: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=00e04495db18849d9fa69d05f3626e66c6a6d4e1, stripped I then ran strace on it, and launched a telnet to 127.0.0.1 : 22 ubuntu@ip-172-31-37-137:~/test$ sudo strace -p 1406 Process 1406 attached select(7, [3 4], NULL, NULL, NULL) = 1 (in [3]) accept(3, {sa_family=AF_INET, sin_port=htons(58853), sin_addr=inet_addr("127.0.0.1")}, [16]) = 5 fcntl(5, F_GETFL) = 0x2 (flags O_RDWR) pipe([6, 7]) = 0 socketpair(PF_LOCAL, SOCK_STREAM, 0, [8, 9]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f95cba7db10) = 6224 Clearly it is calling the accept system call. Next I look at the audit infrastructure to see what it gives me : ubuntu@ip-172-31-37-137:~/test$ sudo auditctl -l LIST_RULES: exit,always arch=3221225534 (0xc000003e) syscall=accept,accept4 Then I use my own tool to catch every msg from the netlink (using audit_get_reply) port and display each and every msg that has a struct audit_reply->len > 0 , as well as audit msgs from netfilter/conntrack. Just to make sure that my audit code/settings are correct, I launch a telnet to port 22, and another one to port 631 (cups), and here's what I see : audit(1421190014.387:45784): audit_enabled=1 old=1 auid=1000 ses=16 res=1 [NEW] tcp 6 120 SYN_SENT src=127.0.0.1 dst=127.0.0.1 sport=58860 dport=22 [UNREPLIED] src=127.0.0.1 dst=127.0.0.1 sport=22 dport=58860 [UPDATE] tcp 6 60 SYN_RECV src=127.0.0.1 dst=127.0.0.1 sport=58860 dport=22 src=127.0.0.1 dst=127.0.0.1 sport=22 dport=58860 [UPDATE] tcp 6 432000 ESTABLISHED src=127.0.0.1 dst=127.0.0.1 sport=58860 dport=22 src=127.0.0.1 dst=127.0.0.1 sport=22 dport=58860 [ASSURED] [UPDATE] tcp 6 120 FIN_WAIT src=127.0.0.1 dst=127.0.0.1 sport=58860 dport=22 src=127.0.0.1 dst=127.0.0.1 sport=22 dport=58860 [ASSURED] [UPDATE] tcp 6 30 LAST_ACK src=127.0.0.1 dst=127.0.0.1 sport=58860 dport=22 src=127.0.0.1 dst=127.0.0.1 sport=22 dport=58860 [ASSURED] [UPDATE] tcp 6 120 TIME_WAIT src=127.0.0.1 dst=127.0.0.1 sport=58860 dport=22 src=127.0.0.1 dst=127.0.0.1 sport=22 dport=58860 [ASSURED] [NEW] tcp 6 120 SYN_SENT src=127.0.0.1 dst=127.0.0.1 sport=40478 dport=6031 [UNREPLIED] src=127.0.0.1 dst=127.0.0.1 sport=6031 dport=40478 [DESTROY] tcp 6 src=127.0.0.1 dst=127.0.0.1 sport=40478 dport=6031 [UNREPLIED] src=127.0.0.1 dst=127.0.0.1 sport=6031 dport=40478 [NEW] tcp 6 120 SYN_SENT src=127.0.0.1 dst=127.0.0.1 sport=36764 dport=631 [UNREPLIED] src=127.0.0.1 dst=127.0.0.1 sport=631 dport=36764 [UPDATE] tcp 6 60 SYN_RECV src=127.0.0.1 dst=127.0.0.1 sport=36764 dport=631 src=127.0.0.1 dst=127.0.0.1 sport=631 dport=36764 [UPDATE] tcp 6 432000 ESTABLISHED src=127.0.0.1 dst=127.0.0.1 sport=36764 dport=631 src=127.0.0.1 dst=127.0.0.1 sport=631 dport=36764 [ASSURED] audit(1421190031.663:45785): arch=c000003e syscall=43 success=yes exit=15 a0=b a1=7f84aee66f7c a2=7fff960572fc a3=7f84ad2b67b8 items=0 ppid=1 pid=22048 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="cupsd" exe="/usr/sbin/cupsd" key=(null) audit(1421190031.663:45785): saddr=02008F9C7F0000010000000000000000 audit(1421190031.663:45785): I never see the accept call for sshd ... even though connection is established, but I see the one for cups. The machine is pretty much idle, so there should be no msgs dropped. Any idea what could be the reason ? I just can't see what I could be doing wrong here. Thanks, Hassan