Hello,
I was trying to establish a secure connection from an old Linux box to an internal AD server (via LDAPS) but it was failing during the handshake. The AD server accepts SSL2, SSL3 and TLS1.
See below the output:
$ openssl s_client -connect myserver.rogers.com:636 -CAfile /home/myuser/openssl/certs/myserver_cert.pem
CONNECTED(00000003)
182899955200:error:140790E5:SSL routines:ssl23_write:ssl handshake failure:s23_lib.c:177:
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 0 bytes and written 318 bytes
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
---
However, if I add any of the following command line options then it works: -ssl2, -ssl3, -tls1, -no_tls1, -no_tls1_1, -no_tls1_2.
See below the output:
$ openssl s_client -connect myserver.rogers.com:636 -CAfile /home/myuser/openssl/certs/myserver_cert.pem -tls1
CONNECTED(00000003)
depth=1 C = CA, O = Rogers Inc., OU = Security, CN = Architecture
verify return:1
depth=0 CN = MYSERVER.rogers.com
verify return:1
---
Certificate chain
0 s:/CN=MSERVER.rogers.com
i:/C=CA/O=Rogers Inc./OU=Security/CN=Architecture
---
Server certificate
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
subject=/CN=MYSERVER.rogers.com
issuer=/C=CA/O=Rogers Inc./OU=Security/CN=Architecture
---
Acceptable client certificate CA names
...
Client Certificate Types: RSA sign, DSA sign
---
SSL handshake has read 4746 bytes and written 404 bytes
---
New, TLSv1/SSLv3, Cipher is RC4-MD5
Server public key is 1024 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
Protocol : TLSv1
Cipher : RC4-MD5
Session-ID: 6D0500005CFB1BC5194D8B3BD939EADFD5AFF2E19D92CA010A54696403E63E99
Session-ID-ctx:
Master-Key: 707D5B10E21FF30B29238D6637C19ACC79382208DBE8F72A05C605424B63258B1B1C4A83C67F17B8E0A62EF67B2B6703
Key-Arg : None
PSK identity: None
PSK identity hint: None
SRP username: None
Start Time: 1438364635
Timeout : 7200 (sec)
Verify return code: 0 (ok)
---
This is the OpenSSL version I'm using:
$ openssl version -a
OpenSSL 1.0.2d 9 Jul 2015
built on: reproducible build, date unspecified
platform: linux-x86_64
options: bn(64,64) rc4(16x,int) des(idx,cisc,16,int) idea(int) blowfish(idx)
compiler: gcc -I. -I.. -I../include -fPIC -DOPENSSL_PIC -DZLIB -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -Wa,--noexecstack -m64 -DL_ENDIAN -O3 -Wall -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DWHIRLPOOL_ASM -DGHASH_ASM -DECP_NISTZ256_ASM
OPENSSLDIR: "/home/myuser/openssl"
My client box is an old Red Hat Enterprise Linux AS release 4 (Nahant Update 9). Below is a little extra info on it, in case it helps:
$ uname -a
Linux elxin009 2.6.9-100.ELsmp #1 SMP Tue Feb 1 12:04:42 EST 2011 x86_64 x86_64 x86_64 GNU/Linux
$ ldd ~/bin/openssl
libssl.so.1.0.0 => /home/myuser/lib/libssl.so.1.0.0 (0x0000002a95558000)
libcrypto.so.1.0.0 => /home/myuser/lib/libcrypto.so.1.0.0 (0x0000002a956c9000)
libdl.so.2 => /lib64/libdl.so.2 (0x00000035ebe00000)
libz.so.1 => /home/myuser/lib/libz.so.1 (0x0000002a959e2000)
libc.so.6 => /lib64/tls/libc.so.6 (0x00000035eb900000)
/lib64/ld-linux-x86-64.so.2 (0x000000552aaaa000)
One final additional information is that I tried to do the exact same thing from a CentOS 6.6 client server and it just worked without any issues using CentOS standard RPMs. However the OpenSSL version there is the following:
$ openssl version -a
OpenSSL 1.0.1e-fips 11 Feb 2013
built on: Mon Jun 15 18:29:40 UTC 2015
platform: linux-x86_64
options: bn(64,64) md2(int) rc4(16x,int) des(idx,cisc,16,int) idea(int) blowfish(idx)
compiler: gcc -fPIC -DOPENSSL_PIC -DZLIB -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -DKRB5_MIT -m64 -DL_ENDIAN -DTERMIO -Wall -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -Wa,--noexecstack -DPURIFY -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DWHIRLPOOL_ASM -DGHASH_ASM
OPENSSLDIR: "/etc/pki/tls"
engines: dynamic
Since my ultimate goal is to connect to the server via LDAPS but apparently OpenLDAP doesn't let me force a particular protocol (TLS1) then I feel I'm stuck. Perhaps I will recompile OpenSSL without TLS to see if it works, but I really don't want to this way.
Any ideas how I can make this work? Is this a bug during the handshake phase?
Thank you,
Felix
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