- stunnel-users - stunnel.org

stunnel and MSIE
by Brugman, Matt 12 May '16

12 May '16

I've compiled stunnel for Windows CE 5.0 and 6.0, and am running it on an ARM device. It is being used in client mode to secure communications to various external servers with not problems. It is also being used to secure Windows CE's webserver. All of the client mode connections are working flawlessly (thanks for the awesome work, by the way!). The webserver is working properly for all browsers except MSIE 11. Everything I've seen tells me that the problem is not really with stunnel or openssl, but with Internet Explorer. I've spent some time searching the mailing list archives and on Google, but haven't really found a solution to this, besides the obvious "well, don't use IE." I'd love to go with the answer, but some of our users are locked into IE, and let's must make it a given that the choice of browser can't be changed. The browser connects, negotiates a connection, and then exchanges keys and certificates. Using the debug console in IE I see that it sends the initial "GET /". Then the browser sees the response header, but no "body" data. Again, I realize this isn't a specific stunnel issue, but I'm hoping someone on the list has seen a similar issue and found a resolution. I've stripped stunnel.conf down to the very basics (some paths removed for clarity): ; Stunnel config for device debug = 7 output = <path removed>stunnel.log options = -NO_SSLv3 log = overwrite ;********* SERVICES *********** [https-server] client = no accept = 443 connect = 127.0.0.1:9975 cert = <path removed>stunnel.pem delay = yes TIMEOUTbusy = 5 TIMEOUTclose = 0 TIMEOUTidle = 30 Stunnel log output. I do see the "Peer suddenly disconnected" messages, but again; I'm not sure why. The last two lines of the log are the "transfer() loop executes not transferring any data": 3916.06.12 08:21:19 LOG7[ui]: Service [https-server] accepted (FD=9) from 192.168.55.77:12377 3916.06.12 08:21:19 LOG7[ui]: Creating a new thread 3916.06.12 08:21:19 LOG7[ui]: New thread created 3916.06.12 08:21:19 LOG7[0]: Service [https-server] started 3916.06.12 08:21:19 LOG5[0]: Service [https-server] accepted connection from 192.168.55.77:12377 3916.06.12 08:21:19 LOG7[0]: SSL state (accept): before/accept initialization 3916.06.12 08:21:19 LOG7[0]: SNI: no virtual services defined 3916.06.12 08:21:19 LOG7[0]: SSL state (accept): SSLv3 read client hello A 3916.06.12 08:21:19 LOG7[0]: SSL state (accept): SSLv3 write server hello A 3916.06.12 08:21:19 LOG7[0]: SSL state (accept): SSLv3 write certificate A 3916.06.12 08:21:19 LOG7[0]: SSL state (accept): SSLv3 write key exchange A 3916.06.12 08:21:19 LOG7[0]: SSL state (accept): SSLv3 write server done A 3916.06.12 08:21:19 LOG7[0]: SSL state (accept): SSLv3 flush data 3916.06.12 08:21:19 LOG7[0]: SSL state (accept): SSLv3 read client certificate A 3916.06.12 08:21:20 LOG7[0]: SSL state (accept): SSLv3 read client key exchange A 3916.06.12 08:21:20 LOG7[0]: SSL state (accept): SSLv3 read certificate verify A 3916.06.12 08:21:20 LOG7[0]: SSL state (accept): SSLv3 read finished A 3916.06.12 08:21:20 LOG7[0]: SSL state (accept): SSLv3 write change cipher spec A 3916.06.12 08:21:20 LOG7[0]: SSL state (accept): SSLv3 write finished A 3916.06.12 08:21:20 LOG7[0]: SSL state (accept): SSLv3 flush data 3916.06.12 08:21:20 LOG7[0]: New session callback 3916.06.12 08:21:20 LOG7[0]: 1 server accept(s) requested 3916.06.12 08:21:20 LOG7[0]: 1 server accept(s) succeeded 3916.06.12 08:21:20 LOG7[0]: 0 server renegotiation(s) requested 3916.06.12 08:21:20 LOG7[0]: 0 session reuse(s) 3916.06.12 08:21:20 LOG7[0]: 0 internal session cache item(s) 3916.06.12 08:21:20 LOG7[0]: 0 internal session cache fill-up(s) 3916.06.12 08:21:20 LOG7[0]: 0 internal session cache miss(es) 3916.06.12 08:21:20 LOG7[0]: 0 external session cache hit(s) 3916.06.12 08:21:20 LOG7[0]: 0 expired session(s) retrieved 3916.06.12 08:21:20 LOG6[0]: SSL accepted: new session negotiated 3916.06.12 08:21:20 LOG6[0]: No peer certificate received 3916.06.12 08:21:20 LOG6[0]: Negotiated TLSv1.2 ciphersuite ECDHE-RSA-AES256-SHA384 (256-bit encryption) 3916.06.12 08:21:20 LOG7[0]: Compression: null, expansion: null 3916.06.12 08:21:20 LOG6[0]: s_connect: connecting 127.0.0.1:9775 3916.06.12 08:21:20 LOG6[0]: s_connect: connected 127.0.0.1:9775 3916.06.12 08:21:20 LOG6[0]: persistence: 127.0.0.1:9775 cached 3916.06.12 08:21:20 LOG5[0]: Service [https-server] connected remote server from 127.0.0.1:49277 3916.06.12 08:21:20 LOG7[0]: Remote descriptor (FD=11) initialized 3916.06.12 08:21:20 LOG6[0]: SSL socket closed (SSL_read) 3916.06.12 08:21:20 LOG7[0]: Sent socket write shutdown 3916.06.12 08:21:20 LOG5[0]: Connection closed: 0 byte(s) sent to SSL, 0 byte(s) sent to socket 3916.06.12 08:21:20 LOG7[0]: Remote descriptor (FD=11) closed 3916.06.12 08:21:20 LOG7[0]: Local descriptor (FD=9) closed 3916.06.12 08:21:20 LOG7[0]: Service [https-server] finished (0 left) 3916.06.12 08:21:22 LOG7[ui]: Found 1 ready file descriptor(s) 3916.06.12 08:21:22 LOG7[ui]: FD=5 ifds=r-x ofds=--- 3916.06.12 08:21:22 LOG7[ui]: Service [https-server] accepted (FD=13) from 192.168.55.77:30351 3916.06.12 08:21:22 LOG7[ui]: Creating a new thread 3916.06.12 08:21:22 LOG7[ui]: New thread created 3916.06.12 08:21:22 LOG7[1]: Service [https-server] started 3916.06.12 08:21:22 LOG5[1]: Service [https-server] accepted connection from 192.168.55.77:30351 3916.06.12 08:21:22 LOG7[1]: SSL state (accept): before/accept initialization 3916.06.12 08:21:22 LOG7[1]: SNI: no virtual services defined 3916.06.12 08:21:22 LOG7[1]: SSL state (accept): SSLv3 read client hello A 3916.06.12 08:21:22 LOG7[1]: SSL state (accept): SSLv3 write server hello A 3916.06.12 08:21:22 LOG7[1]: SSL state (accept): SSLv3 write change cipher spec A 3916.06.12 08:21:22 LOG7[1]: SSL state (accept): SSLv3 write finished A 3916.06.12 08:21:22 LOG7[1]: SSL state (accept): SSLv3 flush data 3916.06.12 08:21:22 LOG7[1]: SSL state (accept): SSLv3 read finished A 3916.06.12 08:21:22 LOG7[1]: 2 server accept(s) requested 3916.06.12 08:21:22 LOG7[1]: 2 server accept(s) succeeded 3916.06.12 08:21:22 LOG7[1]: 0 server renegotiation(s) requested 3916.06.12 08:21:22 LOG7[1]: 1 session reuse(s) 3916.06.12 08:21:22 LOG7[1]: 1 internal session cache item(s) 3916.06.12 08:21:22 LOG7[1]: 0 internal session cache fill-up(s) 3916.06.12 08:21:22 LOG7[1]: 0 internal session cache miss(es) 3916.06.12 08:21:22 LOG7[1]: 0 external session cache hit(s) 3916.06.12 08:21:22 LOG7[1]: 0 expired session(s) retrieved 3916.06.12 08:21:22 LOG6[1]: SSL accepted: previous session reused 3916.06.12 08:21:22 LOG6[1]: s_connect: connecting 127.0.0.1:9775 3916.06.12 08:21:22 LOG6[1]: s_connect: connected 127.0.0.1:9775 3916.06.12 08:21:22 LOG6[1]: persistence: 127.0.0.1:9775 cached 3916.06.12 08:21:22 LOG5[1]: Service [https-server] connected remote server from 127.0.0.1:49278 3916.06.12 08:21:22 LOG7[1]: Remote descriptor (FD=15) initialized 3916.06.12 08:21:22 LOG6[1]: SSL socket closed (SSL_read) 3916.06.12 08:21:22 LOG7[1]: Sent socket write shutdown 3916.06.12 08:21:22 LOG5[1]: Connection closed: 0 byte(s) sent to SSL, 0 byte(s) sent to socket 3916.06.12 08:21:22 LOG7[1]: Remote descriptor (FD=15) closed 3916.06.12 08:21:22 LOG7[1]: Local descriptor (FD=13) closed 3916.06.12 08:21:22 LOG7[1]: Service [https-server] finished (0 left) 3916.06.12 08:21:22 LOG7[ui]: Found 1 ready file descriptor(s) 3916.06.12 08:21:22 LOG7[ui]: FD=5 ifds=r-x ofds=--- 3916.06.12 08:21:22 LOG7[ui]: Service [https-server] accepted (FD=17) from 192.168.55.77:30352 3916.06.12 08:21:22 LOG7[ui]: Creating a new thread 3916.06.12 08:21:22 LOG7[ui]: New thread created 3916.06.12 08:21:22 LOG7[2]: Service [https-server] started 3916.06.12 08:21:22 LOG5[2]: Service [https-server] accepted connection from 192.168.55.77:30352 3916.06.12 08:21:22 LOG7[2]: SSL state (accept): before/accept initialization 3916.06.12 08:21:22 LOG7[2]: SNI: no virtual services defined 3916.06.12 08:21:22 LOG7[2]: SSL state (accept): SSLv3 read client hello A 3916.06.12 08:21:22 LOG7[2]: SSL state (accept): SSLv3 write server hello A 3916.06.12 08:21:22 LOG7[2]: SSL state (accept): SSLv3 write change cipher spec A 3916.06.12 08:21:22 LOG7[2]: SSL state (accept): SSLv3 write finished A 3916.06.12 08:21:22 LOG7[2]: SSL state (accept): SSLv3 flush data 3916.06.12 08:21:22 LOG7[2]: SSL state (accept): SSLv3 read finished A 3916.06.12 08:21:22 LOG7[2]: 3 server accept(s) requested 3916.06.12 08:21:22 LOG7[2]: 3 server accept(s) succeeded 3916.06.12 08:21:22 LOG7[2]: 0 server renegotiation(s) requested 3916.06.12 08:21:22 LOG7[2]: 2 session reuse(s) 3916.06.12 08:21:22 LOG7[2]: 1 internal session cache item(s) 3916.06.12 08:21:22 LOG7[2]: 0 internal session cache fill-up(s) 3916.06.12 08:21:22 LOG7[2]: 0 internal session cache miss(es) 3916.06.12 08:21:22 LOG7[2]: 0 external session cache hit(s) 3916.06.12 08:21:22 LOG7[2]: 0 expired session(s) retrieved 3916.06.12 08:21:22 LOG6[2]: SSL accepted: previous session reused 3916.06.12 08:21:22 LOG6[2]: s_connect: connecting 127.0.0.1:9775 3916.06.12 08:21:22 LOG6[2]: s_connect: connected 127.0.0.1:9775 3916.06.12 08:21:22 LOG6[2]: persistence: 127.0.0.1:9775 cached 3916.06.12 08:21:22 LOG5[2]: Service [https-server] connected remote server from 127.0.0.1:49279 3916.06.12 08:21:22 LOG7[2]: Remote descriptor (FD=19) initialized 3916.06.12 08:21:22 LOG3[2]: SSL socket closed (SSL_read) with 10137 unsent byte(s) 3916.06.12 08:21:22 LOG5[2]: Connection reset: 239 byte(s) sent to SSL, 553 byte(s) sent to socket 3916.06.12 08:21:22 LOG7[2]: Remote descriptor (FD=19) closed 3916.06.12 08:21:22 LOG7[2]: Local descriptor (FD=17) closed 3916.06.12 08:21:22 LOG7[2]: Service [https-server] finished (0 left) 3916.06.12 08:21:23 LOG7[ui]: Found 1 ready file descriptor(s) 3916.06.12 08:21:23 LOG7[ui]: FD=5 ifds=r-x ofds=--- 3916.06.12 08:21:23 LOG7[ui]: Service [https-server] accepted (FD=21) from 192.168.55.77:30353 3916.06.12 08:21:23 LOG7[ui]: Creating a new thread 3916.06.12 08:21:23 LOG7[ui]: New thread created 3916.06.12 08:21:23 LOG7[3]: Service [https-server] started 3916.06.12 08:21:23 LOG5[3]: Service [https-server] accepted connection from 192.168.55.77:30353 3916.06.12 08:21:23 LOG7[3]: SSL state (accept): before/accept initialization 3916.06.12 08:21:23 LOG7[3]: SNI: no virtual services defined 3916.06.12 08:21:23 LOG7[3]: SSL state (accept): SSLv3 read client hello A 3916.06.12 08:21:23 LOG7[3]: SSL state (accept): SSLv3 write server hello A 3916.06.12 08:21:23 LOG7[3]: SSL state (accept): SSLv3 write change cipher spec A 3916.06.12 08:21:23 LOG7[3]: SSL state (accept): SSLv3 write finished A 3916.06.12 08:21:23 LOG7[3]: SSL state (accept): SSLv3 flush data 3916.06.12 08:21:23 LOG7[3]: SSL state (accept): SSLv3 read finished A 3916.06.12 08:21:23 LOG7[3]: 4 server accept(s) requested 3916.06.12 08:21:23 LOG7[3]: 4 server accept(s) succeeded 3916.06.12 08:21:23 LOG7[3]: 0 server renegotiation(s) requested 3916.06.12 08:21:23 LOG7[3]: 3 session reuse(s) 3916.06.12 08:21:23 LOG7[3]: 1 internal session cache item(s) 3916.06.12 08:21:23 LOG7[3]: 0 internal session cache fill-up(s) 3916.06.12 08:21:23 LOG7[3]: 0 internal session cache miss(es) 3916.06.12 08:21:23 LOG7[3]: 0 external session cache hit(s) 3916.06.12 08:21:23 LOG7[3]: 0 expired session(s) retrieved 3916.06.12 08:21:23 LOG6[3]: SSL accepted: previous session reused 3916.06.12 08:21:23 LOG6[3]: s_connect: connecting 127.0.0.1:9775 3916.06.12 08:21:23 LOG6[3]: s_connect: connected 127.0.0.1:9775 3916.06.12 08:21:23 LOG6[3]: persistence: 127.0.0.1:9775 cached 3916.06.12 08:21:23 LOG5[3]: Service [https-server] connected remote server from 127.0.0.1:49280 3916.06.12 08:21:23 LOG7[3]: Remote descriptor (FD=23) initialized 3916.06.12 08:21:23 LOG6[3]: Read socket closed (readsocket) 3916.06.12 08:21:23 LOG7[3]: Sending close_notify alert 3916.06.12 08:21:23 LOG7[3]: SSL alert (write): warning: close notify 3916.06.12 08:21:23 LOG6[3]: SSL_shutdown successfully sent close_notify alert 3916.06.12 08:21:23 LOG3[3]: transfer() loop executes not transferring any data 3916.06.12 08:21:23 LOG3[3]: please report the problem to Michal.Trojnara(a)mirt.net

1 0

Multiple accept parameter, or Ipv4 and v6 in one statement.
by Brandon Jackson 12 May '16

12 May '16

Hi, I'm looking to expand my usage of stunnel. One thing i'm wondering, is there a way to use multiple accepts for the same service. Like: [httpsmain] accept = 443 accept = :::443 connect = 10.0.1.1:9443 or even something like. [httpsmain] accept = 443,:::443 connect = 10.0.1.1:8443 The reason is I'm about to setup some service with sni with a few domains and certs, but if I have to have them on v4 and v6 it looks like i'll have to double everything up. Is there a better way? ---------------------------------- Brandon Jackson bojack1437(a)gmail.com <https://mail.google.com/mail/?view=cm&fs=1&tf=1&[email protected]>

1 0

Timeout when connecting to
by Khan, Mohammed 10 May '16

10 May '16

Hi, I have installed v5.32 Stunnel on my Windows server which is hosted on AWS. I am trying to connect from here using a Emailer app which uses POP3 to try to connect to this server Outlook.Office365.com on port 995, but I keep on getting this error logged in Stunnel logs: [cid:[email protected]] Does anyone have any ideas as to why this connection is timing out please? Any help would be much appreciated thanks in advance! Rgds Mo Khan / Software Engineer / FootFall Tel: +44 121 712 1428 / Mobile: +44 776 692 7120 Yorke House, Arleston Way / Solihull, B90 4LH / United Kingdom mohammedkhan(a)tycoint.com<mailto:%[email protected]> / www.footfall.com<http://www.footfall.com/> [Description: Fieldworks Marketing]<https://urldefense.proofpoint.com/v2/url?u=http-3A__tycoretailsolutions.com…> [Description: Fieldworks Marketing]<http://www.footfall.com/> [Description: http://www.footfall.com/wp-content/uploads/2015/09/LinkedIn.png]<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.linkedin.com_compa…> [Description: http://www.footfall.com/wp-content/uploads/2015/09/Twitter.png] <https://urldefense.proofpoint.com/v2/url?u=https-3A__twitter.com_footfallin…> [Description: http://www.footfall.com/wp-content/uploads/2015/09/YouTube.png] <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.youtube.com_channe…> [Description: http://www.footfall.com/wp-content/uploads/2015/09/Facebook.png] <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.facebook.com_footf…> [Description: http://www.footfall.com/wp-content/uploads/2015/09/Google-.png] <https://urldefense.proofpoint.com/v2/url?u=https-3A__plus.google.com_-2BFoo…> ________________________________ This e-mail contains privileged and confidential information intended for the use of the addressees named above. If you are not the intended recipient of this e-mail, you are hereby notified that you must not disseminate, copy or take any action in respect of any information contained in it. If you have received this e-mail in error, please notify the sender immediately by e-mail and immediately destroy this e-mail and its attachments.

1 0

Temporary DH params in stunnel
by Guillermo Rodriguez Garcia 10 May '16

10 May '16

Hi all, The stunnel docs say that starting with stunnel 5.18, DH params are auto-generated every 24 hours and that this "may take several minutes". I see that for this purpose, stunnel uses OpenSSL's DH_generate_parameters[_ex] function. According to the OpenSSL API docs [1], these functions "may run for several hours before finding a suitable prime." [1]: https://www.openssl.org/docs/manmaster/crypto/DH_generate_parameters.html Wouldn't it make sense to use "DSA-like" DH params for this purpose? These are much faster to generate and apparently equally safe. DSA-like DH params are generated using DSA_generate_parameters[ex]. It is the equivalent of passing the -dsaparam option to the openssl dhparam command. Some useful info: - http://security.stackexchange.com/a/95184/109144 - http://dovecot.org/pipermail/dovecot/2015-November/102447.html Best regards, Guillermo Rodriguez Garcia guille.rodriguez(a)gmail.com

1 0

'Integer constant too large' warnings in str.c
by Guillermo Rodriguez Garcia 10 May '16

10 May '16

Hello, Current stunnel (5.32) gives a bunch of warnings in str.c when the CANARY_XXX and MAGIC_XXX constants are used, for example: str.c:101: warning: integer constant is too large for 'long' type Shouldn't these constants be declared with the 'LL' suffix instead of 'L' ? #define CANARY_INITIALIZED 0x0000c0ded0000000LL #define CANARY_UNINTIALIZED 0x0000abadbabe0000LL #define MAGIC_ALLOCATED 0x0000a110c8ed0000LL #define MAGIC_DEALLOCATED 0x0000defec8ed0000LL Best regards, Guillermo Rodriguez Garcia guille.rodriguez(a)gmail.com

2 1

SNI support in OpenSSL
by Guillermo Rodriguez Garcia 08 May '16

08 May '16

Hello all, The stunnel documentation says that SNI requires stunnel to be linked with OpenSSL >= 1.0.0. However, SNI is supported in OpenSSL since 0.9.8f (and actually enabled by default since 0.9.8k). For 0.9.8f and later, OPENSSL_NO_TLSEXT will be defined if TLS extension support (including SNI support) is not compiled into OpenSSL. Taking the above into account, the OpenSSL version check in stunnel (src/common.h) could be relaxed a bit. Instead of: #if OPENSSL_VERSION_NUMBER<0x10000000L #define OPENSSL_NO_TLSEXT #define OPENSSL_NO_PSK #endif /* OpenSSL older than 1.0.0 */ this could be: #if OPENSSL_VERSION_NUMBER<0x00908060L #define OPENSSL_NO_TLSEXT #endif /* OpenSSL older than 0.9.8f */ #if OPENSSL_VERSION_NUMBER<0x10000000L #define OPENSSL_NO_PSK #endif /* OpenSSL older than 1.0.0 */ This would enable SNI on systems using 0.9.8 (Mac OS X for example). Best regards, Guillermo Rodriguez Garcia guille.rodriguez(a)gmail.com

1 0

SSLv3 not working with version 5.06
by Francois Pires 06 May '16

06 May '16

Hi all, We need use of sslv3 but with debian Jessie package version 5.06 this is not working. I have add options -NO_SSLv3 still same. Can you check if my configuration is good and if you have any idea to have sslv3 working with this verison. # stunnel.conf syslog = no cert = /etc/ssl/certs/test.crt.pem key = /etc/ssl/private/test.key.pem CAfile = /etc/ssl/certs/test.ca-bundle # Protocol version (all, SSLv2, SSLv3, TLSv1) sslVersion = all options = -NO_SSLv3 ciphers = AES256-SHA #ciphers = ECDH@STRENGTH:DH@STRENGTH:HIGH:!RC4:!MD5:!DES:!aNULL:!eNULL # Some debugging stuff useful for troubleshooting debug = 7 output = /stunnel.log # Debian and Ubuntu chroot config chroot = /var/lib/stunnel4/ setuid = stunnel4 setgid = stunnel4 pid = /stunnel4.pid # Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 socket = l:SO_KEEPALIVE=1 socket = r:SO_KEEPALIVE=1 [test] accept = 11443 connect = 127.0.0.1:11444 # stunnel log with openssl test SSL_accept: 14076102: error:14076102:SSL routines:SSL23_GET_CLIENT_HELLO:unsupported protocol openssl s_client -connect 127.0.0.1:11443 -ssl3 CONNECTED(00000003) write:errno=104 --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 0 bytes and written 0 bytes --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE SSL-Session: Protocol : SSLv3 Cipher : 0000 Session-ID: Session-ID-ctx: Master-Key: Key-Arg : None PSK identity: None PSK identity hint: None SRP username: None Start Time: 1462525363 Timeout : 7200 (sec) Verify return code: 0 (ok) -- Cordialement, François PIRES SysAdmin

2 1

how to pass servername openssl parameter
by Dod 04 May '16

04 May '16

Hello, Little question I use openssl s_client mode to call an https with private PKI so private CAFile CERT and also Key, but I also need to use the parameter "servername" but stunnel seems not support it or may be it has an other syntax ? regards.

1 0

Connect to web app with weak crypto
by Pete McEvoy 29 Apr '16

29 Apr '16

Hi. I have a java web app that uses weak crypto. I would like to be able to access it with a modern browser. Currently the only method that seems to work is links on freebsd 9.3, all other browsers give errors such as: Error performing TLS handshake: The Diffie-Hellman prime sent by the server is not acceptable (not long enough). Obviously it would be better if this was fixed but it is not something I have control of. Would it be possible for me to use stunnel to encapsulate the weak connection within a stronger one so the browser does not complain? I have tried this: ; TLS front-end to a web server [https] client = yes accept = 443 connect = 192.168.1.5:443 cert = /usr/local/etc/stunnel/stunnel.pem Which asks me to make an exception for the self signed cert but then proceeds to fail in same way as before. Cheers -- Pete

1 0

Memory Leak in stunnel 5.31
by Fritz Gschwendner 20 Apr '16

20 Apr '16

Thank you. I tried the new version. Between 10:15 and 10:50 stunnel private bytes grew by ~ 85 MB. Log entries regarding "possible memory leak" look like this at the beginning: 2016.04.20 10:17:01 LOG4[937]: Possible memory leak at .\crypto\asn1\tasn_new.c:179: 71652 allocations 2016.04.20 10:17:01 LOG4[937]: Possible memory leak at .\crypto\asn1\asn1_lib.c:412: 70978 allocations 2016.04.20 10:17:01 LOG4[937]: Possible memory leak at .\crypto\asn1\a_object.c:346: 55283 allocations 2016.04.20 10:17:01 LOG4[937]: Possible memory leak at .\crypto\asn1\a_object.c:315: 55283 allocations 2016.04.20 10:17:01 LOG4[937]: Possible memory leak at .\crypto\asn1\asn1_lib.c:376: 56826 allocations 2016.04.20 10:17:01 LOG4[937]: Possible memory leak at .\crypto\stack\stack.c:162: 13761 allocations 2016.04.20 10:17:01 LOG4[937]: Possible memory leak at .\crypto\stack\stack.c:187: 11448 allocations 2016.04.20 10:17:01 LOG4[937]: Possible memory leak at .\crypto\buffer\buffer.c:118: 11172 allocations 2016.04.20 10:17:01 LOG4[937]: Possible memory leak at .\crypto\asn1\tasn_new.c:342: 10501 allocations ..and later like this: 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\asn1\tasn_new.c:179: 182132 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\asn1\asn1_lib.c:412: 181243 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\asn1\a_object.c:346: 138968 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\asn1\a_object.c:315: 138968 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\asn1\asn1_lib.c:376: 144407 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\stack\stack.c:162: 35294 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\stack\stack.c:187: 29760 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\buffer\buffer.c:118: 28186 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\asn1\tasn_new.c:342: 27649 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\bn\bn_lib.c:303: 27405 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\buffer\buffer.c:74: 18971 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\asn1\x_name.c:136: 18967 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\asn1\x_name.c:383: 18967 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\asn1\a_int.c:208: 18406 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\asn1\a_bitstr.c:158: 18433 allocations 2016.04.20 10:51:04 LOG4[2658]: Possible memory leak at .\crypto\bn\bn_lib.c:272: 13616 allocations If there is anything else I can do, please let me know. -----Ursprüngliche Nachricht----- Von: stunnel-users [mailto:[email protected]] Im Auftrag von Michal Trojnara Gesendet: Dienstag, 19. April 2016 23:31 An: stunnel-users(a)stunnel.org Betreff: Re: [stunnel-users] Memory Leak in stunnel 5.31 On 31.03.2016 22:28, Fritz Gschwendner wrote: > we have a memory leak with stunnel 5.31 in server mode on Windows > Server 2012. Page File Bytes of the stunnel process keep growing. [cut] > I suspect it has something to do with clients not closing the > connection correctly. We have a lot of connections ending like > this: [cut] > Is my suspicion plausible? Can you recommend a change in the > configuration to avoid this issue? Anything else I can do to debug? Your suspicion looks plausible. I have added a heuristic algorithm that identifies excessive memory allocations. Please try stunnel-5.32b2: https://www.stunnel.org/downloads.html The logged warnings should allow identification of the leak source. Best regards, Mike _______________________________________________ stunnel-users mailing list stunnel-users(a)stunnel.org https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users

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