[stunnel-users] Stunnel.conf won't load with certain ciphers.

Fri Mar 9 06:40:43 CET 2012

Update:

I uninstalled version 4.52, then reinstalled version 4.47.  RC4-SHA 
cipher now works correctly,
with the same stunnel.conf.

~~~~~~~~~~~~~~~~~~~~~~

2012.03.08 23:36:50 LOG5[420:580]: stunnel 4.47 on x86-pc-mingw32-gnu 
platform
2012.03.08 23:36:50 LOG5[420:580]: Compiled/running with OpenSSL 1.0.0e 
6 Sep 2011
2012.03.08 23:36:50 LOG5[420:580]: Threading:WIN32 SSL:ENGINE Auth:none 
Sockets:SELECT,IPv6
2012.03.08 23:36:50 LOG5[420:580]: Reading configuration from file 
stunnel.conf
2012.03.08 23:36:50 LOG6[420:580]: Initializing SSL context for service 
nntps.1
2012.03.08 23:36:50 LOG6[420:580]: SSL context initialized
2012.03.08 23:36:50 LOG6[420:580]: Initializing SSL context for service 
nntps.2
2012.03.08 23:36:50 LOG6[420:580]: SSL context initialized
2012.03.08 23:36:50 LOG5[420:580]: Configuration successful
2012.03.08 23:37:08 LOG5[420:2804]: Service nntps.2 accepted connection 
from 127.0.1.2:1033
2012.03.08 23:37:08 LOG6[420:2804]: connect_blocking: connecting 
88.198.244.100:563
2012.03.08 23:37:09 LOG5[420:2804]: connect_blocking: connected 
88.198.244.100:563
2012.03.08 23:37:09 LOG5[420:2804]: Service nntps.2 connected remote 
server from 173.89.4.172:1034
2012.03.08 23:37:09 LOG5[420:2804]: Certificate accepted: depth=2, 
/C=IL/O=StartCom Ltd./OU=Secure Digital Certificate Signing/CN=StartCom 
Certification Authority
2012.03.08 23:37:09 LOG5[420:2804]: Certificate accepted: depth=1, 
/C=IL/O=StartCom Ltd./OU=Secure Digital Certificate Signing/CN=StartCom 
Class 1 Primary Intermediate Server CA
2012.03.08 23:37:09 LOG6[420:2804]: CERT: Locally installed certificate 
matched
2012.03.08 23:37:09 LOG5[420:2804]: Certificate accepted: depth=0, 
/description=436134-bRSt8Rml1Sum890r/CN=news.eternal-september.org/emailAddress=wolfgang at weyand-hg.de
2012.03.08 23:37:09 LOG6[420:2804]: SSL connected: new session negotiated
2012.03.08 23:37:09 LOG6[420:2804]: Negotiated ciphers: RC4-SHA SSLv3 
Kx=RSA Au=RSA Enc=RC4(128) Mac=SHA1
2012.03.08 23:37:20 LOG6[420:2804]: SSL_shutdown successfully sent 
close_notify
2012.03.08 23:37:20 LOG5[420:2804]: Connection closed: 1251 bytes sent 
to SSL, 1861 bytes sent to socket

Regards;

Thomas

On 3/8/2012 8:44 PM, Thomas Eifert wrote:
> Hello all:
>
> I'm running Stunnel 4.52 under WinXP SP3.
>
> Last night I had some questions about how the cipher list in Stunnel 
> interacts with the
> cipher negotiation routine between client and server, so I did some 
> experiments in an
> attempt to address those questions.
>
> In the course of doing so, I noticed that, if I attempt to load 
> certain ciphers, Stunnel
> would stall at configuration load.
>
> Using OpenSSL to list TLS ciphers with 4.52's libraries yields the 
> following:
>
> ~~~~~~~~~~~~~~~~~~~~~
>
> C:\Program Files\stunnel>openssl ciphers -v -tls1
>
> DHE-RSA-AES256-SHA      SSLv3 Kx=DH       Au=RSA  Enc=AES(256)  Mac=SHA1
> DHE-DSS-AES256-SHA      SSLv3 Kx=DH       Au=DSS  Enc=AES(256)  Mac=SHA1
> AES256-SHA              SSLv3 Kx=RSA      Au=RSA  Enc=AES(256)  Mac=SHA1
> EDH-RSA-DES-CBC3-SHA    SSLv3 Kx=DH       Au=RSA  Enc=3DES(168) Mac=SHA1
> EDH-DSS-DES-CBC3-SHA    SSLv3 Kx=DH       Au=DSS  Enc=3DES(168) Mac=SHA1
> DES-CBC3-SHA            SSLv3 Kx=RSA      Au=RSA  Enc=3DES(168) Mac=SHA1
> DHE-RSA-AES128-SHA      SSLv3 Kx=DH       Au=RSA  Enc=AES(128)  Mac=SHA1
> DHE-DSS-AES128-SHA      SSLv3 Kx=DH       Au=DSS  Enc=AES(128)  Mac=SHA1
> AES128-SHA              SSLv3 Kx=RSA      Au=RSA  Enc=AES(128)  Mac=SHA1
> IDEA-CBC-SHA            SSLv3 Kx=RSA      Au=RSA  Enc=IDEA(128) Mac=SHA1
> RC4-SHA                 SSLv3 Kx=RSA      Au=RSA  Enc=RC4(128)  Mac=SHA1
> RC4-MD5                 SSLv3 Kx=RSA      Au=RSA  Enc=RC4(128)  Mac=MD5
> EDH-RSA-DES-CBC-SHA     SSLv3 Kx=DH       Au=RSA  Enc=DES(56)   Mac=SHA1
> EDH-DSS-DES-CBC-SHA     SSLv3 Kx=DH       Au=DSS  Enc=DES(56)   Mac=SHA1
> DES-CBC-SHA             SSLv3 Kx=RSA      Au=RSA  Enc=DES(56)   Mac=SHA1
> EXP-EDH-RSA-DES-CBC-SHA SSLv3 Kx=DH(512)  Au=RSA  Enc=DES(40)   
> Mac=SHA1 export
> EXP-EDH-DSS-DES-CBC-SHA SSLv3 Kx=DH(512)  Au=DSS  Enc=DES(40)   
> Mac=SHA1 export
> EXP-DES-CBC-SHA         SSLv3 Kx=RSA(512) Au=RSA  Enc=DES(40)   
> Mac=SHA1 export
> EXP-RC2-CBC-MD5         SSLv3 Kx=RSA(512) Au=RSA  Enc=RC2(40)   
> Mac=MD5  export
> EXP-RC4-MD5             SSLv3 Kx=RSA(512) Au=RSA  Enc=RC4(40)   
> Mac=MD5  export
>
> C:\Program Files\stunnel>
>
> ~~~~~~~~~~~~~~~~~~~~~
>
> As such, ciphers RC4-SHA and RC4-MD5 appear to be valid.  However, any 
> attempt at using those
> in client mode causes Stunnel to stall when reading the cipher from 
> stunnel.conf:
>
> ~~~~~~~~~~~~~~~~~~~~~
>
> 2012.03.08 20:17:10 LOG5[432:592]: Reading configuration from file 
> stunnel.conf
> 2012.03.08 20:17:10 LOG5[432:592]: FIPS mode is enabled
> 2012.03.08 20:17:10 LOG7[432:592]: Compression not enabled
> 2012.03.08 20:17:10 LOG7[432:592]: Snagged 64 random bytes from C:/.rnd
> 2012.03.08 20:17:10 LOG7[432:592]: Wrote 1024 new random bytes to C:/.rnd
> 2012.03.08 20:17:10 LOG7[432:592]: PRNG seeded successfully
> 2012.03.08 20:17:10 LOG6[432:592]: Initializing SSL context for 
> service nntps.1
> 2012.03.08 20:17:10 LOG7[432:592]: Loaded verify certificates from 
> peer-nntps.1.pem
> 2012.03.08 20:17:10 LOG7[432:592]: Loaded peer-nntps.1.pem revocation 
> lookup file
> 2012.03.08 20:17:10 LOG7[432:592]: SSL options set: 0x00000004
> 2012.03.08 20:17:10 LOG6[432:592]: SSL context initialized
> 2012.03.08 20:17:10 LOG6[432:592]: Initializing SSL context for 
> service nntps.2
> 2012.03.08 20:17:10 LOG7[432:592]: Loaded verify certificates from 
> peer-nntps.2.pem
> 2012.03.08 20:17:10 LOG7[432:592]: Loaded peer-nntps.2.pem revocation 
> lookup file
> 2012.03.08 20:17:10 LOG3[432:592]: SSL_CTX_set_cipher_list: 1410D0B9: 
> error:1410D0B9:SSL routines:SSL_CTX_set_cipher_list:no cipher match
> 2012.03.08 20:17:10 LOG3[432:592]: Failed to reload the configuration 
> file
> 2012.03.08 20:17:10 LOG7[432:592]: Signal pipe is empty
>
> ~~~~~~~~~~~~~~~~~~~~
>
> This is the relevant snippet from my stunnel.conf file:
>
> ~~~~~~~~~~~~~~~~~~~~
>
> debug = 7
> delay = yes
> output = stunnel.log
>
> [nntps.1]
> client = yes
> sslVersion = TLSv1
> ciphers = DHE-RSA-AES256-SHA:DHE-DSS-AES256-SHA:AES256-SHA
> cafile = peer-nntps.1.pem
> verify = 4
> accept = 127.0.1.1:119
> connect = news.server.com:443
>
> [nntps.2]
> client = yes
> sslVersion = TLSv1
> ciphers = RC4-SHA
> cafile = peer-nntps.2.pem
> verify = 4
> accept = 127.0.1.2:119
> connect = news.server.org:563
>
> ~~~~~~~~~~~~~~~~~~~~
>
> Any attempt at using ciphers RC4-SHA or RC4-MD5. with or without TLS 
> specified, results in
> the same configuration crash.
>
> I don't really need to use those ciphers, but since I observed this 
> behavior, I thought I'd better
> report it.
>
> Any comments welcome.
>
> Regards;
>
> Thomas
> .
>

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