[sr-dev] kamailio 3.1.0 crash on ssl-dos attack
Jijo
realjijo at gmail.com
Wed Dec 14 23:21:29 CET 2011
Hi,
As i mentioned in my previous mail that i tested limiting the TLS
connection but didn't help. The problem was high frequent renegotiation on
existing TLS connections. This was causing the kamailio to restart.
So i was thinking to disable the renegoitation until OPENSSL comeup with a
solution to this issue.
Thanks
Jijo
On Wed, Dec 14, 2011 at 5:45 AM, Daniel-Constantin Mierla <miconda at gmail.com
> wrote:
> Hello,
>
> I committed yesterday in master branch the code that adds a new global
> parameter tls_max_connections which sets a limit on how many active tls
> connections are on sip server. Since tls connections are over tcp,
> practically tls_max_connections is not effective if greater than
> tcp_max_connections, since the last will be reached first.
>
> Can you give it a try and see if works for you.
>
> Cheers,
> Daniel
>
>
> On 12/10/11 12:53 AM, Jijo wrote:
>
> Hi
>
> Since TLS run on TCP, the max TLS connections accepted is based on
> tcp_max_connections. I thought its better to limit the max tls
> connections, since tls require more memory for each tls connection.
>
> I did look futher into the issue and the kamailio crashes only when the
> tool(*thc-ssl-dos)* is ran with periodic renegotiation. Kamailo doesn't
> crash if the renegotiation is disabled in the tool.
>
> The htppd has fixed this issue by providing a flag to disable TLS
> renegotation in the server from any client. Please find the httpd patch at
>
> http://mail-archives.apache.org/mod_mbox/httpd-dev/200911.mbox/raw/%3c20091106030922.GA3764@redhat.com%3e/
>
> So I was thinking to apply the same patch in kamailio also. We could have
> a new flag in tls_domain structure to enable or disable renegotation.
>
> Please have a look and let me know your findings.
>
> Thanks
> Jijo
>
>
> On Fri, Dec 9, 2011 at 1:53 AM, Daniel-Constantin Mierla <
> miconda at gmail.com> wrote:
>
>> Hello,
>>
>> my plan is to look at it as I get back to office (being few days off).
>>
>> But, isn't tcp_max_connections applied to tls connections? If not, adding
>> such limit will be good anyhow.
>>
>> Cheers,
>> Daniel
>>
>>
>>
>> On 12/7/11 8:57 PM, Jijo wrote:
>>
>> Hi All..
>>
>> Any comments/suggestions on this issue?
>>
>> Thanks
>> Jijo
>>
>> On Mon, Dec 5, 2011 at 6:56 PM, Jijo <realjijo at gmail.com> wrote:
>>
>>> Hello
>>>
>>> I tested using 3.2 and i got the same error. I couldn't get the memlog,
>>> when i enable , the system doesn't come up.
>>>
>>> The latest update from http://www.thc.org/thc-ssl-dos/ says that
>>>
>>> "2011-OCT-24 UPDATE:
>>> SSL-DOS released. Some organizations already found out about this
>>> release a while ago and mistakenly identified it as an SSL-RENEGOTIATION
>>> BUG. This is not true. The tool can be modified to work without
>>> SSL-RENEGOTIATION by just establishing a new TCP connection for every new
>>> handshake. "
>>>
>>> So this issue could happen if we do TCP connection for every new TLS
>>> connection with renegotiation. I believe this could be fixed if we could
>>> block based on max active TLS connections, probably a similar flag for max
>>> TLS connections like "tcp_max_connections"
>>>
>>>
>>> Core was generated by `/usr/sbin/kamailio -u swrun -g sw -m 160 -f
>>> /etc/kamailio/kamailio.cfg'.
>>>
>>> Program terminated with signal 11, Segmentation fault.
>>> #0 0xb61cc2e3 in ?? () from /usr/lib/kamailio/modules/tls.so
>>> (gdb) bt
>>> #0 0xb61cc2e3 in ?? () from /usr/lib/kamailio/modules/tls.so
>>> #1 0xb65199fd in CRYPTO_lock () from /lib/libcrypto.so.1.0.0
>>> #2 0xb658c133 in ?? () from /lib/libcrypto.so.1.0.0
>>> #3 0xb658d240 in RAND_add () from /lib/libcrypto.so.1.0.0
>>> #4 0xb6690d50 in ssl3_accept () from /lib/libssl.so.1.0.0
>>> #5 0xb669bd2f in ssl3_read_bytes () from /lib/libssl.so.1.0.0
>>> #6 0xb66989b9 in ?? () from /lib/libssl.so.1.0.0
>>> #7 0xb66ae499 in SSL_read () from /lib/libssl.so.1.0.0
>>> #8 0xb61e1e33 in tls_read_f () from /usr/lib/kamailio/modules/tls.so
>>> #9 0x08177036 in tcp_read_headers ()
>>> #10 0x081771f6 in tcp_read_req ()
>>> #11 0x08178480 in ?? ()
>>> #12 0x0817af77 in tcp_receive_loop ()
>>> #13 0x08173597 in tcp_init_children ()
>>> #14 0x080b20bf in main_loop ()
>>> #15 0x080b38c3 in main ()
>>> (gdb)
>>>
>>>
>>>
>>> On Wed, Nov 23, 2011 at 10:35 AM, Daniel-Constantin Mierla <
>>> miconda at gmail.com> wrote:
>>>
>>>> Hello,
>>>>
>>>> 3.1.0 is not the right choice in 3.1 series, there were many fixes that
>>>> were added to that release series branch. The latest stable version there
>>>> is 3.1.5. Try with it (even better, try with latest version from git branch
>>>> 3.1 -- see
>>>> http://www.kamailio.org/dokuwiki/doku.php/install:kamailio-3.1.x-from-git
>>>> )
>>>>
>>>> In this way we are sure it is not a bug that was fixed after the time
>>>> of releasing 3.1.0 -- config file and database is the same as for 3.1.0.
>>>>
>>>> Cheers,
>>>> Daniel
>>>>
>>>>
>>>> On 11/23/11 4:01 PM, Jijo wrote:
>>>>
>>>> Thanks I will attach the logs soon..meanwhile here is the kamailio and
>>>> openssl version
>>>>
>>>> OB151:~ # /usr/sbin/kamailio -V
>>>> version: kamailio 3.1.0 (i386/linux) 21a375
>>>> flags: STATS: Off, USE_IPV6, USE_TCP, USE_TLS, TLS_HOOKS,
>>>> USE_RAW_SOCKS, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC,
>>>> DBG_QM_MALLOC, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE,
>>>> USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
>>>> ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16,
>>>> MAX_URI_SIZE 1024, BUF_SIZE 65535, PKG_SIZE 15MB
>>>> poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
>>>> id: 21a375
>>>> compiled on 09:22:51 Nov 4 2011 with gcc 4.5.0
>>>>
>>>>
>>>> OB151:~ # openssl version -a
>>>> OpenSSL 1.0.0 29 Mar 2010
>>>> built on: 2011-05-31 07:52:17.000000000 +0000
>>>> platform: linux-elf
>>>> options: bn(64,32) rc4(4x,int) des(ptr,risc1,16,long) blowfish(idx)
>>>> compiler: gcc -fPIC -DOPENSSL_PIC -DZLIB -DOPENSSL_THREADS -D_REENTRANT
>>>> -DDSO_DLFCN -DHAVE_DLFCN_H
>>>> -DL_ENDIAN -DTERMIO -O3 -fomit-frame-pointer -Wall -fomit-frame-pointer
>>>> -fmessage-length=0 -O2 -Wall
>>>> -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables
>>>> -fasynchronous-unwind-tables -g -Wa,--noexecstack -fomit-frame-pointer
>>>> -fno-strict-aliasing
>>>> -DTERMIO -Wall -fstack-protector -DOPENSSL_BN_ASM_PART_WORDS
>>>> -DOPENSSL_IA32_SSE2
>>>> -DOPENSSL_BN_ASM_MONT -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM
>>>> -DRMD160_ASM -DAES_ASM -DWHIRLPOOL_ASM
>>>> OPENSSLDIR: "/etc/ssl"
>>>>
>>>>
>>>> On Wed, Nov 23, 2011 at 4:44 AM, Daniel-Constantin Mierla <
>>>> miconda at gmail.com> wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> (discussion kept only on sr-dev as it is very likely going to require
>>>>> mostly devel interaction).
>>>>>
>>>>> What is the version of kamailio (-V command line option). Also, send
>>>>> the verision of openssl library -- there were many bugs in various lib
>>>>> versions that had to be workarounded in the module, maybe this is a new one
>>>>> that has to be fixed.
>>>>>
>>>>> Do you get any error message in the syslog at the moment of the crash?
>>>>>
>>>>> What would be useful is to get the memory operations log, you can get
>>>>> it by setting:
>>>>>
>>>>> memdbg=1
>>>>> memlog=1
>>>>>
>>>>> in config file.
>>>>>
>>>>> Then repeat the test and make the log available for download somehow
>>>>> (if it is too big), from start to the moment of the crash.
>>>>>
>>>>> Cheers,
>>>>> Daniel
>>>>>
>>>>>
>>>>> On 11/22/11 11:30 PM, Jijo wrote:
>>>>>
>>>>> Hi All,
>>>>>
>>>>> Kamailio is resetting when we do TLS renegotiation dos attack using
>>>>> the tool available at http://www.thc.org/thc-ssl-dos/.
>>>>>
>>>>> Anybody looked at this issue? How we could resolve it. Any idea?
>>>>>
>>>>> The core generated for 3 pid's as below
>>>>>
>>>>> Pid 1:
>>>>>
>>>>> Core was generated by `/usr/sbin/kamailio -u swrun -g sw -m 120 -f
>>>>> /etc/kamailio/kamailio.cfg'.
>>>>> Program terminated with signal 11, Segmentation fault.
>>>>> #0 atomic_inc_int () at atomic/atomic_x86.h:225
>>>>> (gdb) bt
>>>>> #0 atomic_inc_int () at atomic/atomic_x86.h:225
>>>>> #1 cfg_update_local () at cfg/cfg_struct.h:228
>>>>> #2 timer_main () at timer.c:994
>>>>> #3 0x080b0579 in main_loop () at main.c:1632
>>>>> #4 0x080b1be4 in main (argc=9, argv=0xbfd61e54) at main.c:2446
>>>>>
>>>>>
>>>>> Pid 2:
>>>>>
>>>>> Core was generated by `/usr/sbin/kamailio -u swrun -g sw -m 120 -f
>>>>> /etc/kamailio/kamailio.cfg'.
>>>>> Program terminated with signal 11, Segmentation fault.
>>>>> #0 0x0819bfe8 in qm_insert_free (qm=0xaf6c5000, p=0xb05eec30,
>>>>> file=0xb6fb4140 "tls: tls_init.c", func=0xb6fb4ce0 "ser_free", line=296)
>>>>> at mem/q_malloc.c:184
>>>>> 184 if (frag->size <= f->size) break;
>>>>> (gdb) bt
>>>>> #0 0x0819bfe8 in qm_insert_free (qm=0xaf6c5000, p=0xb05eec30,
>>>>> file=0xb6fb4140 "tls: tls_init.c", func=0xb6fb4ce0 "ser_free", line=296)
>>>>> at mem/q_malloc.c:184
>>>>> #1 qm_free (qm=0xaf6c5000, p=0xb05eec30, file=0xb6fb4140 "tls:
>>>>> tls_init.c", func=0xb6fb4ce0 "ser_free", line=296) at mem/q_malloc.c:518
>>>>> #2 0xb6f95404 in ser_free (ptr=0xb05eec30) at tls_init.c:296
>>>>> #3 0xb732e9ba in CRYPTO_free (str=0xb05eec30) at mem.c:391
>>>>> #4 0xb7330bee in int_new_ex_data (class_index=5, obj=0xbfd414f4,
>>>>> ad=0xbfd41574) at ex_data.c:440
>>>>> #5 0xb7330443 in CRYPTO_new_ex_data (class_index=5, obj=0xbfd414f4,
>>>>> ad=0xbfd41574) at ex_data.c:575
>>>>> #6 0xb73dfde3 in X509_STORE_CTX_init (ctx=0xbfd414f4,
>>>>> store=0xafd8b3d0, x509=0xafe08ff0, chain=0x0) at x509_vfy.c:2114
>>>>> #7 0xb74b0f31 in ssl3_output_cert_chain (s=0xb0553a10, x=0xafe08ff0)
>>>>> at s3_both.c:349
>>>>> #8 0xb74a4728 in ssl3_send_server_certificate (s=0xb0553a10) at
>>>>> s3_srvr.c:3034
>>>>> #9 0xb74a5879 in ssl3_accept (s=0xb0553a10) at s3_srvr.c:353
>>>>> #10 0xb74afa8f in ssl3_read_bytes (s=0xb0553a10, type=23,
>>>>> buf=0xb0ad44ec "", len=4095, peek=0) at s3_pkt.c:1266
>>>>> #11 0xb74ac9c9 in ssl3_read_internal (s=0xb0553a10, buf=0xb0ad44ec,
>>>>> len=4095, peek=0) at s3_lib.c:3265
>>>>> #12 0xb74c24a9 in SSL_read (s=0xb0553a10, buf=0xb0ad44ec, num=4095) at
>>>>> ssl_lib.c:954
>>>>> #13 0xb6fad1c3 in tls_read_f (c=0xb0ad431c, flags=0xbfd619c4) at
>>>>> tls_server.c:1058
>>>>> #14 0x08171c0e in tcp_read_headers (c=0xb0ad431c,
>>>>> read_flags=0xbfd619c4) at tcp_read.c:406
>>>>> #15 0x08171db8 in tcp_read_req (con=0xb0ad431c, bytes_read=0xbfd619cc,
>>>>> read_flags=0xbfd619c4) at tcp_read.c:885
>>>>> #16 0x08172f67 in handle_io (fm=<value optimized out>, events=1,
>>>>> idx=<value optimized out>) at tcp_read.c:1234
>>>>> #17 0x0817583b in io_wait_loop_epoll (unix_sock=89) at io_wait.h:1092
>>>>> #18 tcp_receive_loop (unix_sock=89) at tcp_read.c:1345
>>>>> #19 0x0816e2e9 in tcp_init_children () at tcp_main.c:4867
>>>>> #20 0x080affb1 in main_loop () at main.c:1646
>>>>> #21 0x080b1be4 in main (argc=9, argv=0xbfd61e54) at main.c:2446
>>>>>
>>>>> Pid 3:
>>>>>
>>>>> Core was generated by `/usr/sbin/kamailio -u swrun -g sw -m 120 -f
>>>>> /etc/kamailio/kamailio.cfg'.
>>>>> Program terminated with signal 11, Segmentation fault.
>>>>> #0 0xb76c9e7c in memmove () from /lib/libc.so.6
>>>>> (gdb) bt
>>>>> #0 0xb76c9e7c in memmove () from /lib/libc.so.6
>>>>> #1 0x081724e7 in tcp_read_req (con=0xb022c8f0, bytes_read=0xbfd619cc,
>>>>> read_flags=0xbfd619c4) at tcp_read.c:1026
>>>>> #2 0x08172f67 in handle_io (fm=<value optimized out>, events=1,
>>>>> idx=<value optimized out>) at tcp_read.c:1234
>>>>> #3 0x0817583b in io_wait_loop_epoll (unix_sock=93) at io_wait.h:1092
>>>>> #4 tcp_receive_loop (unix_sock=93) at tcp_read.c:1345
>>>>> #5 0x0816e2e9 in tcp_init_children () at tcp_main.c:4867
>>>>> #6 0x080affb1 in main_loop () at main.c:1646
>>>>> #7 0x080b1be4 in main (argc=9, argv=0xbfd61e54) at main.c:2446
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> sr-dev mailing listsr-dev at lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>>>>>
>>>>>
>>>>> --
>>>>> Daniel-Constantin Mierla -- http://www.asipto.com
>>>>> Kamailio Advanced Training, Dec 5-8, Berlin: http://asipto.com/u/kathttp://linkedin.com/in/miconda -- http://twitter.com/miconda
>>>>>
>>>>>
>>>>
>>>> --
>>>> Daniel-Constantin Mierla -- http://www.asipto.com
>>>> Kamailio Advanced Training, Dec 5-8, Berlin: http://asipto.com/u/kathttp://linkedin.com/in/miconda -- http://twitter.com/miconda
>>>>
>>>>
>>>
>>
>> --
>> Daniel-Constantin Mierla -- http://www.asipto.comhttp://linkedin.com/in/miconda -- http://twitter.com/miconda
>>
>>
>
>
> _______________________________________________
> sr-dev mailing listsr-dev at lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>
>
> --
> Daniel-Constantin Mierla -- http://www.asipto.comhttp://linkedin.com/in/miconda -- http://twitter.com/miconda
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.sip-router.org/pipermail/sr-dev/attachments/20111214/8401c9d9/attachment-0001.htm>
More information about the sr-dev
mailing list