Channel Encryption Debug modified by Christian Ferrari

Christian Ferrari — Fri, 01 Apr 2016 20:40:25 -0000

Channel Encryption Debugging

This debug session uses two different nodes; these are the names used during all the session:

node1, name: ubuntu1004.brenta.org, operating system: Ubuntu Linux 10.04 (64 bit)
node2, name: centos71-64.brenta.org, operating system: CentOS 7.1 (64 bit)

Native FLoM debugging tool

Sometimes debugging becomes difficult, especially when you have to deal with networks, firewalls, public and private addresses and so on.
For some complex features, FLoM provide a native debugging tool that should help system engineers to understand the root cause of an issue.

Setting up the certification authority and the required certificates

The instruction that are shown below are inspired by this precious documentation.
Take a look to the original documentation of the previous link for a good explanation related to certification authority and certificates.

Creating a CA (Certification Authority) of name CA1

Connect to node1, and execute these commands to create the directory structure:

tiian@ubuntu1004:~$ mkdir flom_ssl
tiian@ubuntu1004:~$ cd flom_ssl
tiian@ubuntu1004:~/flom_ssl$ mkdir CA1
tiian@ubuntu1004:~/flom_ssl$ cd CA1
tiian@ubuntu1004:~/flom_ssl/CA1$ mkdir certs crl newcerts private
tiian@ubuntu1004:~/flom_ssl/CA1$ echo "01" > serial
tiian@ubuntu1004:~/flom_ssl/CA1$ cp /dev/null index.txt
tiian@ubuntu1004:~/flom_ssl/CA1$ ls -la
total 28
drwxr-xr-x 6 tiian tiian 4096 2016-03-29 22:09 .
drwxr-xr-x 3 tiian tiian 4096 2016-03-29 22:09 ..
drwxr-xr-x 2 tiian tiian 4096 2016-03-29 22:09 certs
drwxr-xr-x 2 tiian tiian 4096 2016-03-29 22:09 crl
-rw-r--r-- 1 tiian tiian    0 2016-03-29 22:09 index.txt
drwxr-xr-x 2 tiian tiian 4096 2016-03-29 22:09 newcerts
drwxr-xr-x 2 tiian tiian 4096 2016-03-29 22:09 private
-rw-r--r-- 1 tiian tiian    3 2016-03-29 22:09 serial

Pick-up a openssl.cnf example file; FLoM provide a pre-configured file in directory /usr/local/share/doc/flom/:

tiian@ubuntu1004:~/flom_ssl/CA1$ ls -la /usr/local/share/doc/flom/flom_openssl.conf 
-rw-r--r-- 1 root root 9431 2016-03-28 19:34 /usr/local/share/doc/flom/flom_openssl.conf

copy it locally:

tiian@ubuntu1004:~/flom_ssl/CA1$ cp /usr/local/share/doc/flom/flom_openssl.conf .

You can configure it as described here, but for basic usage the supplied one should be good enough.

Generate the certificate for the CA:

tiian@ubuntu1004:~/flom_ssl/CA1$ openssl req -new -x509 -keyout private/cakey.pem -out cacert.pem -days 3650 -config flom_openssl.conf 
Generating a 1024 bit RSA private key
...++++++
..............++++++
writing new private key to 'private/cakey.pem'
Enter PEM pass phrase:
Verifying - Enter PEM pass phrase:
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [IT]:
State or Province Name (full name) [Treviso]:
Locality Name (eg, city) [Mogliano Veneto]:
Organization Name (eg, company) [FLoM Software Corporation]:
Organizational Unit Name (eg, section) [Development and Research]:
Common Name (eg, YOUR name) []:CA for FLoM Channel Encryption
Email Address []:

File cacert.pem contains the X.509 certificate of the certification authority you have just created and file private/cakey.pem contains the private key associated to the certification authority.

tiian@ubuntu1004:~/flom_ssl/CA1$ ls -la cacert.pem private/cakey.pem 
-rw-r--r-- 1 tiian tiian 1411 2016-03-29 22:19 cacert.pem
-rw-r--r-- 1 tiian tiian  963 2016-03-29 22:19 private/cakey.pem

Creating a first X.509 certificate

To implement a channel encryption configuration just one certificate is enough.

Now you have to execute 4 commands; the system asks for a password: the same password used for the certification authority (see above).

tiian@ubuntu1004:~/flom_ssl/CA1$ openssl req -nodes -new -x509 -keyout first_key.pem -out first_req.pem -days 3650 -config flom_openssl.conf
tiian@ubuntu1004:~/flom_ssl/CA1$ openssl x509 -x509toreq -in first_req.pem -signkey first_key.pem -out tmp.pem
tiian@ubuntu1004:~/flom_ssl/CA1$ openssl ca -config flom_openssl.conf -policy policy_anything -out first_cert.pem -infiles tmp.pem
tiian@ubuntu1004:~/flom_ssl/CA1$ rm tmp.pem

The output should be something like this:

tiian@ubuntu1004:~/flom_ssl/CA1$ openssl req -nodes -new -x509 -keyout first_key.pem -out first_req.pem -days 3650 -config flom_openssl.conf
Generating a 1024 bit RSA private key
.........++++++
...++++++
writing new private key to 'first_key.pem'
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [IT]:
State or Province Name (full name) [Treviso]:
Locality Name (eg, city) [Mogliano Veneto]:
Organization Name (eg, company) [FLoM Software Corporation]:
Organizational Unit Name (eg, section) [Development and Research]:
Common Name (eg, YOUR name) []:Generic FLoM node
Email Address []:
tiian@ubuntu1004:~/flom_ssl/CA1$ openssl x509 -x509toreq -in first_req.pem -signkey first_key.pem -out tmp.pem
Getting request Private Key
Generating certificate request
tiian@ubuntu1004:~/flom_ssl/CA1$ openssl ca -config flom_openssl.conf -policy policy_anything -out first_cert.pem -infiles tmp.pem
Using configuration from flom_openssl.conf
Enter pass phrase for ./private/cakey.pem:
Check that the request matches the signature
Signature ok
Certificate Details:
        Serial Number: 1 (0x1)
        Validity
            Not Before: Mar 29 20:29:07 2016 GMT
            Not After : Mar 29 20:29:07 2017 GMT
        Subject:
            countryName               = IT
            stateOrProvinceName       = Treviso
            localityName              = Mogliano Veneto
            organizationName          = FLoM Software Corporation
            organizationalUnitName    = Development and Research
            commonName                = Generic FLoM node
        X509v3 extensions:
            X509v3 Basic Constraints: 
                CA:FALSE
            Netscape Comment: 
                OpenSSL Generated Certificate
            X509v3 Subject Key Identifier: 
                E9:77:80:9F:6F:A7:1D:55:E6:46:31:48:91:E8:64:DD:37:3B:58:5D
            X509v3 Authority Key Identifier: 
                keyid:71:E4:77:AE:FD:4B:17:9C:4D:9E:7C:B6:1D:8D:37:08:F2:DD:09:AC

Certificate is to be certified until Mar 29 20:29:07 2017 GMT (365 days)
Sign the certificate? [y/n]:y

1 out of 1 certificate requests certified, commit? [y/n]y
Write out database with 1 new entries
Data Base Updated
tiian@ubuntu1004:~/flom_ssl/CA1$ rm tmp.pem

If everything is fine, you must have two files: first_cert.pem contains the X.509 certificate for your FLoM node(s) and first_key.pem contains the private key associated to the certicate:

tiian@ubuntu1004:~/flom_ssl/CA1$ ls -la first_cert.pem first_key.pem 
-rw-r--r-- 1 tiian tiian 3391 2016-03-29 22:29 first_cert.pem
-rw-r--r-- 1 tiian tiian  887 2016-03-29 22:26 first_key.pem

Certificate "installation"

Only 3 files are needed to FLoM process (flom):

first_cert.pem
first_key.pem
cacert.pem

copy them in a easy to use place on both systems.
Local copy:

tiian@ubuntu1004:~/flom_ssl/CA1$ mkdir /tmp/flom_ssl
tiian@ubuntu1004:~/flom_ssl/CA1$ cp cacert.pem first_cert.pem first_key.pem /tmp/flom_ssl/
tiian@ubuntu1004:~/flom_ssl/CA1$ ls -la /tmp/flom_ssl/
total 20
drwxr-xr-x 2 tiian tiian 4096 2016-03-29 22:39 .
drwxrwxrwt 5 root  root  4096 2016-03-29 22:39 ..
-rw-r--r-- 1 tiian tiian 1411 2016-03-29 22:39 cacert.pem
-rw-r--r-- 1 tiian tiian 3391 2016-03-29 22:39 first_cert.pem
-rw-r--r-- 1 tiian tiian  887 2016-03-29 22:39 first_key.pem

Remote copy:

tiian@ubuntu1004:~/flom_ssl/CA1$ scp -r /tmp/flom_ssl/ tiian@centos71-64.brenta.org:/tmp
Enter passphrase for key '/home/tiian/.ssh/id_rsa': 
first_cert.pem                                100% 3391     3.3KB/s   00:00    
cacert.pem                                    100% 1411     1.4KB/s   00:00    
first_key.pem                                 100%  887     0.9KB/s   00:00

Check the content in node2:

[tiian@centos71-64 CA1]$ ls -la /tmp/flom_ssl/
total 16
drwxr-xr-x.  2 tiian tiian   64 29 mar 22.40 .
drwxrwxrwt. 10 root  root  4096 29 mar 22.40 ..
-rw-r--r--.  1 tiian tiian 1411 29 mar 22.40 cacert.pem
-rw-r--r--.  1 tiian tiian 3391 29 mar 22.40 first_cert.pem
-rw-r--r--.  1 tiian tiian  887 29 mar 22.40 first_key.pem

Using TLS (channel encryption security level) with FLoM

Setting a trace mask to trace the messaged produced by flom_tls and flom_tcp modules can help to troubleshoot a possible issue.

This is the command to start a FLoM debug server using TLS inside node1:

tiian@ubuntu1004:~$ export FLOM_TRACE_MASK=0x70000
tiian@ubuntu1004:~$ echo $FLOM_TRACE_MASK0x70000
tiian@ubuntu1004:~$ flom --debug-feature=tls.server -a ubuntu1004.brenta.org --tls-certificate=/tmp/flom_ssl/first_cert.pem --tls-private-key=/tmp/flom_ssl/first_key.pem --tls-ca-certificate=/tmp/flom_ssl/cacert.pem --tls-check-peer-id=no

This is the command to start a FLoM debug client using TLS inside node2:

[tiian@centos71-64 ~]$ export FLOM_TRACE_MASK=0x70000[tiian@centos71-64 ~]$ echo $FLOM_TRACE_MASK0x70000
[tiian@centos71-64 ~]$ flom --debug-feature=tls.client -a ubuntu1004.brenta.org --tls-certificate=/tmp/flom_ssl/first_cert.pem --tls-private-key=/tmp/flom_ssl/first_key.pem --tls-ca-certificate=/tmp/flom_ssl/cacert.pem --tls-check-peer-id=no

This is the output that you should obtain on node1 (debug server):

2016-04-01 22:22:30.172686 [1348/0xfec510] flom_debug_features
2016-04-01 22:22:30.172813 [1348/0xfec510] flom_debug_features: name='tls.server'
2016-04-01 22:22:30.172829 [1348/0xfec510] flom_debug_features_tls_server
2016-04-01 22:22:30.172850 [1348/0xfec510] flom_tcp_init
2016-04-01 22:22:30.172860 [1348/0xfec510] flom_tcp_init
2016-04-01 22:22:30.172872 [1348/0xfec510] flom_tls_init: calling SSL_library_init()...
2016-04-01 22:22:30.173009 [1348/0xfec510] flom_tls_init: calling SSL_load_error_strings()...
2016-04-01 22:22:30.174172 [1348/0xfec510] flom_tls_init: calling OpenSSL_add_all_algorithms()...
2016-04-01 22:22:30.174338 [1348/0xfec510] flom_tls_context
2016-04-01 22:22:30.174349 [1348/0xfec510] flom_tls_context: setting TLS/SSL method to TLSv1_server_method()
2016-04-01 22:22:30.174693 [1348/0xfec510] flom_tls_context: SSL_CTX_set_verify(0x1013830, 3, flom_tls_callback)
2016-04-01 22:22:30.174717 [1348/0xfec510] flom_tls_context/excp=2/ret_cod=0/errno=2
2016-04-01 22:22:30.174732 [1348/0xfec510] flom_tls_set_cert
2016-04-01 22:22:30.174740 [1348/0xfec510] flom_tls_set_cert: SSL_CTX_use_certificate_file(obj->ctx, '/tmp/flom_ssl/first_cert.pem', SSL_FILETYPE_PEM)
2016-04-01 22:22:30.175043 [1348/0xfec510] flom_tls_set_cert: SSL_CTX_use_PrivateKey_file(obj->ctx, '/tmp/flom_ssl/first_key.pem', SSL_FILETYPE_PEM)
2016-04-01 22:22:30.175215 [1348/0xfec510] flom_tls_set_cert: SSL_CTX_check_private_key(obj->ctx)
2016-04-01 22:22:30.175243 [1348/0xfec510] flom_tls_set_cert: SSL_CTX_load_verify_locations(obj->ctx, '/tmp/flom_ssl/cacert.pem', NULL)
2016-04-01 22:22:30.175424 [1348/0xfec510] flom_tls_set_cert/excp=4/ret_cod=0/errno=2
2016-04-01 22:22:30.175445 [1348/0xfec510] flom_tcp_listen
2016-04-01 22:22:30.175454 [1348/0xfec510] flom_tcp_listen: binding address 'ubuntu1004.brenta.org' and port 28015
2016-04-01 22:22:30.177735 [1348/0xfec510] flom_tcp_listen/getaddrinfo(): [ai_flags=1,ai_family=2,ai_socktype=1,ai_protocol=6,ai_addrlen=16,ai_canonname='{null}'] [ai_flags=1,ai_family=10,ai_socktype=1,ai_protocol=6,ai_addrlen=28,ai_canonname='{null}'] 
2016-04-01 22:22:30.177781 [1348/0xfec510] flom_tcp_listen: ai_addr addrlen=16; IPv4 address, sin_port=28015, sin_addr='192.168.122.57'
2016-04-01 22:22:30.177840 [1348/0xfec510] flom_tcp_listen: bound!
2016-04-01 22:22:30.177868 [1348/0xfec510] flom_tcp_listen/excp=3/ret_cod=0/errno=22
2016-04-01 22:22:46.170112 [1348/0xfec510] flom_debug_features_tls_server: incoming connection address data: addrlen=16; IPv4 address, sin_port=56573, sin_addr='192.168.122.12'
2016-04-01 22:22:46.170179 [1348/0xfec510] flom_tls_accept
2016-04-01 22:22:46.170190 [1348/0xfec510] flom_tls_prepare
2016-04-01 22:22:46.170252 [1348/0xfec510] flom_tls_prepare/excp=3/ret_cod=0/errno=22
2016-04-01 22:22:46.174396 [1348/0xfec510] flom_tls_callback: preverify_ok=1
2016-04-01 22:22:46.174418 [1348/0xfec510] flom_tls_callback: ret_cod=1
2016-04-01 22:22:46.174592 [1348/0xfec510] flom_tls_callback: preverify_ok=1
2016-04-01 22:22:46.174601 [1348/0xfec510] flom_tls_callback: ret_cod=1
2016-04-01 22:22:46.176158 [1348/0xfec510] flom_tls_accepted: connection accepted with AES256-SHA encryption
2016-04-01 22:22:46.176175 [1348/0xfec510] flom_tls_cert_parse
...
2016-04-01 22:22:46.176257 [1348/0xfec510] flom_tls_cert_parse: issuer fields are C=IT/ST=Treviso/L=Mogliano Veneto/O=FLoM Software Corporation/OU=Development and Research/emailAddress={null}/CN=CA for FLoM Channel Encryption
...
2016-04-01 22:22:46.176489 [1348/0xfec510] flom_tls_cert_parse: subject fields are C=IT/ST=Treviso/L=Mogliano Veneto/O=FLoM Software Corporation/OU=Development and Research/emailAddress={null}/CN=Generic FLoM node
2016-04-01 22:22:46.176536 [1348/0xfec510] flom_tls_cert_parse/excp=4/ret_cod=0/errno=0
2016-04-01 22:22:46.176545 [1348/0xfec510] flom_tls_accept/excp=3/ret_cod=0/errno=0
2016-04-01 22:22:46.176552 [1348/0xfec510] flom_tls_recv
2016-04-01 22:22:46.178669 [1348/0xfec510] flom_tls_recv: received 32 of 100 bytes
2016-04-01 22:22:46.178687 [1348/0xfec510] flom_tls_recv/excp=1/ret_cod=0/errno=0
2016-04-01 22:22:46.178694 [1348/0xfec510] flom_debug_features_tls_server: received 32 bytes, '6046574205df4258aeb409bf377235e0'
2016-04-01 22:22:46.178771 [1348/0xfec510] flom_debug_features_tls_server: sending 32 bytes, '91ed6d1ed76c5773c7503d285679b33b'
2016-04-01 22:22:46.178780 [1348/0xfec510] flom_tls_send
2016-04-01 22:22:46.178824 [1348/0xfec510] flom_tls_send/excp=2/ret_cod=0/errno=0
2016-04-01 22:22:46.178836 [1348/0xfec510] flom_tcp_close
2016-04-01 22:22:46.178878 [1348/0xfec510] flom_tcp_close/excp=1/ret_cod=0/errno=0
2016-04-01 22:22:46.178890 [1348/0xfec510] flom_tcp_close
2016-04-01 22:22:46.178940 [1348/0xfec510] flom_tcp_close/excp=1/ret_cod=0/errno=0
2016-04-01 22:22:46.179087 [1348/0xfec510] flom_debug_features_tls_server/excp=13/ret_cod=0/errno=0
2016-04-01 22:22:46.179101 [1348/0xfec510] flom_debug_features/excp=1/ret_cod=0/errno=0
tiian@ubuntu1004:~$ echo $?
0

This is the output that you should obtain on node2 (debug client):

2016-04-01 22:22:45.506324 [2010/0x256d200] flom_debug_features
2016-04-01 22:22:45.506557 [2010/0x256d200] flom_debug_features: name='tls.client'
2016-04-01 22:22:45.506575 [2010/0x256d200] flom_debug_features_tls_client
2016-04-01 22:22:45.506589 [2010/0x256d200] flom_tcp_init
2016-04-01 22:22:45.506602 [2010/0x256d200] flom_tls_init: calling SSL_library_init()...
2016-04-01 22:22:45.506892 [2010/0x256d200] flom_tls_init: calling SSL_load_error_strings()...
2016-04-01 22:22:45.510156 [2010/0x256d200] flom_tls_init: calling OpenSSL_add_all_algorithms()...
2016-04-01 22:22:45.510326 [2010/0x256d200] flom_tls_context
2016-04-01 22:22:45.510333 [2010/0x256d200] flom_tls_context: setting TLS/SSL method to TLSv1_client_method()
2016-04-01 22:22:45.510830 [2010/0x256d200] flom_tls_context: SSL_CTX_set_verify(0x258bbd0, 1, flom_tls_callback)
2016-04-01 22:22:45.510854 [2010/0x256d200] flom_tls_context/excp=2/ret_cod=0/errno=2
2016-04-01 22:22:45.510863 [2010/0x256d200] flom_tls_set_cert
2016-04-01 22:22:45.510869 [2010/0x256d200] flom_tls_set_cert: SSL_CTX_use_certificate_file(obj->ctx, '/tmp/flom_ssl/first_cert.pem', SSL_FILETYPE_PEM)
2016-04-01 22:22:45.511231 [2010/0x256d200] flom_tls_set_cert: SSL_CTX_use_PrivateKey_file(obj->ctx, '/tmp/flom_ssl/first_key.pem', SSL_FILETYPE_PEM)
2016-04-01 22:22:45.511355 [2010/0x256d200] flom_tls_set_cert: SSL_CTX_check_private_key(obj->ctx)
2016-04-01 22:22:45.511372 [2010/0x256d200] flom_tls_set_cert: SSL_CTX_load_verify_locations(obj->ctx, '/tmp/flom_ssl/cacert.pem', NULL)
2016-04-01 22:22:45.511568 [2010/0x256d200] flom_tls_set_cert/excp=4/ret_cod=0/errno=2
2016-04-01 22:22:45.511585 [2010/0x256d200] flom_tcp_connect
2016-04-01 22:22:45.511591 [2010/0x256d200] flom_tcp_connect: connecting to address 'ubuntu1004.brenta.org' and port 28015
2016-04-01 22:22:45.515958 [2010/0x256d200] flom_tcp_connect/getaddrinfo(): [ai_flags=2,ai_family=2,ai_socktype=1,ai_protocol=6,ai_addrlen=16,ai_canonname='ubuntu1004.brenta.org'] [ai_flags=2,ai_family=10,ai_socktype=1,ai_protocol=6,ai_addrlen=28,ai_canonname='{null}'] 
2016-04-01 22:22:45.515999 [2010/0x256d200] flom_tcp_try_connect: sa addrlen=16; IPv4 address, sin_port=28015, sin_addr='192.168.122.57'
2016-04-01 22:22:45.517012 [2010/0x256d200] flom_tcp_try_connect: sa addrlen=16; IPv4 address, sin_port=28015, sin_addr='192.168.122.57'
2016-04-01 22:22:45.517670 [2010/0x256d200] flom_tcp_connect: domain=2, sockfd=3, socket_type=16, addrlen=0
2016-04-01 22:22:45.517701 [2010/0x256d200] flom_tcp_connect: addrlen=16; IPv4 address, sin_port=28015, sin_addr='192.168.122.57'
2016-04-01 22:22:45.517733 [2010/0x256d200] flom_tcp_connect/excp=2/ret_cod=0/errno=22
2016-04-01 22:22:45.517743 [2010/0x256d200] flom_tls_connect
2016-04-01 22:22:45.517750 [2010/0x256d200] flom_tls_prepare
2016-04-01 22:22:45.517842 [2010/0x256d200] flom_tls_prepare/excp=3/ret_cod=0/errno=22
2016-04-01 22:22:45.519259 [2010/0x256d200] flom_tls_callback: preverify_ok=1
2016-04-01 22:22:45.519286 [2010/0x256d200] flom_tls_callback: ret_cod=1
2016-04-01 22:22:45.519449 [2010/0x256d200] flom_tls_callback: preverify_ok=1
2016-04-01 22:22:45.519459 [2010/0x256d200] flom_tls_callback: ret_cod=1
2016-04-01 22:22:45.524159 [2010/0x256d200] flom_tls_connect: connection established with AES256-SHA encryption
2016-04-01 22:22:45.524179 [2010/0x256d200] flom_tls_cert_parse
...
2016-04-01 22:22:45.524251 [2010/0x256d200] flom_tls_cert_parse: issuer fields are C=IT/ST=Treviso/L=Mogliano Veneto/O=FLoM Software Corporation/OU=Development and Research/emailAddress={null}/CN=CA for FLoM Channel Encryption
...
2016-04-01 22:22:45.525551 [2010/0x256d200] flom_tls_cert_parse: subject fields are C=IT/ST=Treviso/L=Mogliano Veneto/O=FLoM Software Corporation/OU=Development and Research/emailAddress={null}/CN=Generic FLoM node
2016-04-01 22:22:45.525573 [2010/0x256d200] flom_tls_cert_parse/excp=4/ret_cod=0/errno=0
2016-04-01 22:22:45.525578 [2010/0x256d200] flom_tls_connect/excp=3/ret_cod=0/errno=0
2016-04-01 22:22:45.526165 [2010/0x256d200] flom_debug_features_tls_client: sending 32 bytes, '6046574205df4258aeb409bf377235e0'
2016-04-01 22:22:45.526177 [2010/0x256d200] flom_tls_send
2016-04-01 22:22:45.526214 [2010/0x256d200] flom_tls_send/excp=2/ret_cod=0/errno=0
2016-04-01 22:22:45.526223 [2010/0x256d200] flom_tls_recv
2016-04-01 22:22:45.526721 [2010/0x256d200] flom_tls_recv: received 32 of 100 bytes
2016-04-01 22:22:45.526734 [2010/0x256d200] flom_tls_recv/excp=1/ret_cod=0/errno=0
2016-04-01 22:22:45.526739 [2010/0x256d200] flom_debug_features_tls_client: received 32 bytes, '91ed6d1ed76c5773c7503d285679b33b'
2016-04-01 22:22:45.526746 [2010/0x256d200] flom_tcp_close
2016-04-01 22:22:45.526771 [2010/0x256d200] flom_tcp_close/excp=1/ret_cod=0/errno=0
2016-04-01 22:22:45.526951 [2010/0x256d200] flom_debug_features_tls_client/excp=10/ret_cod=0/errno=0
2016-04-01 22:22:45.526966 [2010/0x256d200] flom_debug_features/excp=1/ret_cod=0/errno=0
[tiian@centos71-64 ~]$ echo $?
0

The key messages are the following ones:

The debug client send its unique ID:

2016-04-01 22:22:45.526165 [2010/0x256d200] flom_debug_features_tls_client: sending 32 bytes, '6046574205df4258aeb409bf377235e0'

the debug server receives the unique ID sent by the debug client and replies with its own unique ID:

2016-04-01 22:22:46.178694 [1348/0xfec510] flom_debug_features_tls_server: received 32 bytes, '6046574205df4258aeb409bf377235e0'
2016-04-01 22:22:46.178771 [1348/0xfec510] flom_debug_features_tls_server: sending 32 bytes, '91ed6d1ed76c5773c7503d285679b33b'

the debug client receives the unique ID sent by the debug server:

2016-04-01 22:22:45.526739 [2010/0x256d200] flom_debug_features_tls_client: received 32 bytes, '91ed6d1ed76c5773c7503d285679b33b'

Remove trace mask , then restart the debug server on node1:

tiian@ubuntu1004:~$ unset FLOM_TRACE_MASK
tiian@ubuntu1004:~$ flom --debug-feature=tls.server -a ubuntu1004.brenta.org --tls-certificate=/tmp/flom_ssl/first_cert.pem --tls-private-key=/tmp/flom_ssl/first_key.pem --tls-ca-certificate=/tmp/flom_ssl/cacert.pem --tls-check-peer-id=no
tiian@ubuntu1004:~$ echo $?
0

Remove trace mask, then restart the debug client on node2:

[tiian@centos71-64 ~]$ unset FLOM_TRACE_MASK
[tiian@centos71-64 ~]$ flom --debug-feature=tls.client -a ubuntu1004.brenta.org --tls-certificate=/tmp/flom_ssl/first_cert.pem --tls-private-key=/tmp/flom_ssl/first_key.pem --tls-ca-certificate=/tmp/flom_ssl/cacert.pem --tls-check-peer-id=no
[tiian@centos71-64 ~]$ echo $?
0

When everything is fine, no messages on the terminal are printed and the exit code of the flom command is 0.

Configuration hint

A more convenient way to setup all the TLS parameters is to use a FLoM [Configuration] file: these are the keys you have to customize:

[TLS]
# Name of the file that contains the X.509 certificate assigned to this peer
# (Uncomment below row if necessary)
#TlsCertificate=cert.pem
# Name of the file that contains the private key of this peer
# (Uncomment below row if necessary)
#TlsPrivateKey=priv_key.pem
# Name of the file that contains the X.509 certificate of the certification
# authority used to sign the certificate of this peer
# (Uncomment below row if necessary)
#TlsCaCertificate=ca_cert.pem
# Check if the CommonName (CN) of the peer certificate matches the peer unique
# identifier; valid values are "yes" and "no" (case insensitive)
# (Uncomment below row if necessary)
#TlsCheckPeerId=yes

System message logging

Both client and server writes logging messages on the system log.

On the server side (node1):

tiian@ubuntu1004:~$ sudo tail /var/log/syslog 
[sudo] password for tiian: 
Apr  1 22:22:46 ubuntu1004 flom: FLM011I X.509 CA certificate fields are C=IT/ST=Treviso/L=Mogliano Veneto/O=FLoM Software Corporation/OU=Development and Research/emailAddress={null}/CN=CA for FLoM Channel Encryption
Apr  1 22:22:46 ubuntu1004 flom: FLM012I X.509 peer certificate fields are C=IT/ST=Treviso/L=Mogliano Veneto/O=FLoM Software Corporation/OU=Development and Research/emailAddress={null}/CN=Generic FLoM node
Apr  1 22:32:50 ubuntu1004 flom: FLM011I X.509 CA certificate fields are C=IT/ST=Treviso/L=Mogliano Veneto/O=FLoM Software Corporation/OU=Development and Research/emailAddress={null}/CN=CA for FLoM Channel Encryption
Apr  1 22:32:50 ubuntu1004 flom: FLM012I X.509 peer certificate fields are C=IT/ST=Treviso/L=Mogliano Veneto/O=FLoM Software Corporation/OU=Development and Research/emailAddress={null}/CN=Generic FLoM node

On the client side (node2), these are the corresponding messages:

[tiian@centos71-64 ~]$ sudo tail /var/log/messages
[sudo] password for tiian: 
Apr  1 22:32:49 centos71-64 flom: FLM011I X.509 CA certificate fields are C=IT/ST=Treviso/L=Mogliano Veneto/O=FLoM Software Corporation/OU=Development and Research/emailAddress={null}/CN=CA for FLoM Channel Encryption
Apr  1 22:32:49 centos71-64 flom: FLM012I X.509 peer certificate fields are C=IT/ST=Treviso/L=Mogliano Veneto/O=FLoM Software Corporation/OU=Development and Research/emailAddress={null}/CN=Generic FLoM node

Recent changes to Channel Encryption Debug

Channel Encryption Debug modified by Christian Ferrari

Channel Encryption Debug modified by Christian Ferrari

Channel Encryption Debug modified by Christian Ferrari

Channel Encryption Debug modified by Christian Ferrari

Channel Encryption Debugging

Native FLoM debugging tool

Setting up the certification authority and the required certificates

Creating a CA (Certification Authority) of name CA1

Creating a first X.509 certificate

Certificate "installation"

Using TLS (channel encryption security level) with FLoM

The key messages are the following ones:

Configuration hint

System message logging