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Introduction

The code in this repository is used to create a Third-Party Verifier, which is able to perform TCG compliant remote attestation operation on the NED(s) pre-registered to it.

The verifier hosts four services, remote attestation server, IMA reference database, periodic attestation tasks, web service publishes the attestation result.

The remote attestation server is using OpenAttestation v1.7 with additional tools to find the IMA measurements in the integrity report sent from the NED to the verifier in the reference database.

The reference database is hosted using apache-cassandra-1.2.19, with customised modules to compare the package's versions, and store them in order in the reference database.

The periodic attestation is created using Celery, and the message broker is rabbitmq.

The verifier is a computing intensive entity, the minimum spec is 2 CPU cores @ 2.66Ghz + 4GB memory + 4GB swap, the recommended spec is 4 cores @ 3392.142MHz + 4GB memory + 4GB swap.

Dependencies for CentOS7 mininal installation:

root@verifier# yum install epel-release
root@verifier# yum install ant trousers trousers-devel php-soap mariadb mariadb-server python-networkx python-suds python-matplotlib graphviz-devel patch java-1.7.0-openjdk java-1.7.0-openjdk-devel zip unzip gcc gcc-c++ rpm-build python-pip git httpd php php-mysql rpm-devel rabbitmq-server mod_ssl mysql-connector-python firewalld
root@verifier# pip install pycassa pygraphviz Celery urllib3 requests tornado

Installation steps:

  1. it is assumed that the initial directory is BASEDIR/verifier and all files are cloned to this directory;

  2. map the verifier's ip address into /etc/hosts and change the local host name to 'verifier', to simplify the future setup;

    root@verifier# echo -e 'xxx.xxx.xxx.xxx \t verifier' >> /etc/hosts
root@verifier# echo 'verifier' > /etc/hostname

    attestation requests are sent to the host named verifier.

  3. go to BASEDIR/verifier/OpenAttestation/Source directory, run distribute_jar_packages.sh;

    root@verifier# cd BASEDIR/verifier/OpenAttestation/Source
root@verifier# bash distribute_jar_packages.sh

  4. go to BASEDIR/verifier/OpenAttestation/Installer directory, run rpm.sh to compile the OAT-appraiser package;

    root@verifier# cd BASEDIR/verifier/OpenAttestation/Installer
root@verifier# sh rpm.sh -s BASEDIR/verifier/OpenAttestation/Source

    exactly from this directory, otherwise it does not work.

  5. install the package of /root/rpmbuild/RPMS/x86_64/OAT-Appraiser-Base-OATapp-1.0.0-2.el7.centos.x86_64.rpm;

    root@verifier# systemctl start mariadb
root@verifier# systemctl enable mariadb
root@verifier# cd /root/rpmbuild/RPMS/x86_64/
root@verifier# yum localinstall OAT-Appraiser-Base-OATapp-1.0.0-2.el7.centos.x86_64.rpm
root@verifier# systemctl daemon-reload

    run this step only when mariadb service is running, because during installation phase, OAT will create database oat_db in mariadb.

  6. go to BASEDIR/verifier/OpenAttestation/CommandTool directory, and generate the CA certificate which will be used to access the OpenAttestation's services;

    user@verifier$ cd BASEDIR/verifier/OpenAttestation/CommandTool
user@verifier$ bash oat_cert -h verifier

  7. and configure OpenAttestation with the configure_oat.sh following this format;

    user@verifier$ bash configure_oat.sh $selfname $attestorname $attestorIP $PCR0value $OSdistname $RApath $DBIP $CERTDGST

    example:

    bash configure_oat.sh verifier ned xxx.xxx.xxx.xxx 7D94A15BE0295A3743FC259B07202FF42550B369 CentOS7 /root/ratools-tclouds/verifier/v2/ra_verifier.py xxx.xxx.xxx.xxx 8b71648e9c52a24cfe259305c611483ea56ca4dc

    $selfname is 'verifier' by default, it is the host accepting the attestation requests

    $attestorname is the attestor's hostname, which will be used in the attestation requests

    $attestorIP is the IP address of the attestor, which will be linked the $attestorname

    $PCR0value is the value in the PCR0 slot in the TPM, which is used as a golden value with VALIDATE_PCR command

    $OSdistname is the distribution of the OS running in the attestor, which will be used in the attestation analysis

    $RApath is the path to the ra_verifier.py script, which is used to analyse the IMA measurements

    $DBIP is the ip of the reference database, if the database is running inside the same machine, please just put localhost

    $CERTDGST is the SHA1 digest of the file containing the strongSwan certificate used for NED to authenticate itself (i.e. peerCert.der)

  8. open ports for receiving/sending integrity reports, default ports are 80 and 8443

    root@verifier# firewall-cmd --permanent --add-port=80/tcp
root@verifier# firewall-cmd --add-port=80/tcp
root@verifier# firewall-cmd --permanent --add-port=8443/tcp
root@verifier# firewall-cmd --add-port=8443/tcp

  9. change /etc/oat-appraiser/OAT.properties to store integrity reports in files, receive delta reports and discard identical integrity reports;

    uncomment IR_DIR, IR_DIGEST_METHOD, SCALABILITY, DISCARD_IDENTICAL_IR

  10. to check if the verifier is working, use a browser to access the verifier's reference portal in the following link address:

    http://verifier/OAT/alerts.php

    In case of 403 Forbidden error, needs to change the permission of /var/www/html/OAT.

  11. in this step, ned need to be configured;

    read guidelines in ned repo.

  12. install cassandra reference database;

    root@verifier# cd BASEDIR/verifier/db/install
root@verifier# tar -xvzf apache-cassandra-1.2.19-bin.tar.gz
root@verifier# ./install_cassandra_libs.sh BASEDIR/verifier/db/install/apache-cassandra-1.2.19

  13. initialise the reference database with the schema used to store the information;

    root@verifier# cd BASEDIR/verifier/db/install/apache-cassandra-1.2.19/bin
root@verifier# ./cassandra > /dev/null
root@verifier# ./cassandra-cli -h localhost -f BASEDIR/verifier/db/install/cassandra/schema/cassandra-schema-common.txt
root@verifier# ./cassandra-cli -h localhost -f BASEDIR/verifier/db/install/cassandra/schema/cassandra-schema-rpm.txt

  14. copy configuration files into /etc/ra;

    root@verifier# mkdir /etc/ra
root@verifier# cp BASEDIR/verifier/db/conf/pkgs_download_list.conf.sample /etc/ra/pkgs_download_list.conf
root@verifier# cp BASEDIR/verifier/db/conf/ra.conf.sample /etc/ra/ra.conf

RABASEDIR in ra.conf needs to be changed to BASEDIR/verifier

  1. create Packages directory, go to scripts directory and run update_pkgs.sh;

    root@verifier# mkdir BASEDIR/verifier/Packages
root@verifier# cd BASEDIR/verifier/db/scripts
root@verifier# bash update_pkgs.sh

  2. when the database is created, please use the ra_verifier.py script to test it;

    root@verifier# cd BASEDIR/verifier/v2
root@verifier# ./ra_verifier.py -i BASEDIR/verifier/db/measurements/ascii_runtime_measurements -q CentOS7 -a "load-time,l_req=l4|>=" -v -H localhost

Should see information like following: ```bash Info: 0 (0/0) 0 (0/0) 0 0

Info: 0.00266
0.24042
0.07041
0.11005
0
0.42355
```

  1. start the command in CommandTool to poll the integrity reports and verify it as defined in the configure.sh script;

    root@verifier# bash oat_pollhosts -h verifier '{"hosts":["ned"],"analysisType":"load-time+check-cert,l_req=l4_ima_all_ok|==,cert_digest=095b7792c076d65a9c45f4f484d06cd1fa29a9ba"}'

  2. if returned result is 'untrusted', which means the attestation feature is actually working, but there are some unknown digests in the IMA measurement list. In order to see which are unknown digests, run the following command:

    URL=https://verifier:8443/HisWebServices/hisDownloadReportService?wsdl IR=177 OS=CentOS7 /BASEDIR/verifier/v2/ra_verifier.py -H localhost -a "load-time+check-cert,l_req=l4_ima_all_ok|==,cert_digest=095b7792c076d65a9c45f4f484d06cd1fa29a9ba" -v

You need to change the IR to the id received in the previous command (i.e. pollhosts) and also the cert_digest to the one measured in the NED. For unknown digests, two possible solutions. First, insert unknown digests in the whilelist, which is stored in ``/BASEDIR/verifier/v2/structs.py, called known_digests. If multiple unknown digests are from a same package, which is not installed from the official repository, then you can insert the package manually as a 'testing' package with following command: ```bash user@verifier$ bash /BASEDIR/verifier/db/scripts/update_pkgs.sh -d temp/ -t testing -n CentOS -q 7 -c x86_64 ``` Where temp` directory is used for storing the testing packages.

  1. to update the certificate used by strongSwan in the NED, the information of this NED needs to be updated;

    root@verifier:# bash update_cert.sh $selfname $attestorname $attestorIP $OSdistname $CERTDGST

example: bash user@verifier$ update_cert.sh verifier ned xxx.xxx.xxx.xxx CentOS7 8b71648e9c52a24cfe259305c611483ea56ca4dc

  1. to configure periodic attestation task; first need to configure rabbitmq-server

    root@verifier:# rabbitmqctl add_user user secured
root@verifier:# rabbitmqctl add_vhost uservhost
root@verifier:# rabbitmqctl set_permissions -p uservhost user ".*" ".*" ".*"
root@verifier:# systemctl enable rabbitmq-server
root@verifier:# systemctl start rabbitmq-server

If you start the rabbitmq-server, your rabbit node should now be rabbit@myhost, as verified by rabbitmqctl: bash root@verifier:# rabbitmqctl status If you need to stop the rabbitmq server, just run: bash root@verifier:# rabbitmqctl stop

  1. after rabbitmq-server is running, you can configure Celery in /BASEDIR/verifier/ram/config.py and /BASEDIR/verifier/ram/celeryconfig.py. In celeryconfig.py, you can change the periodic attestation frequency. In config.py, you can change the OpenAttestation related parameters, especially OAT_NODE, OAT_VERIFIER and OAT_LEVEL. Also, the new certificate generated by OpenAttestation (i.e. certfile.cer) needs to be copied from the BASEDIR/verifier/OpenAttestation/CommandTool into data directory to replace the old one. Then copy /BASEDIR/verifier/ram to /home/user/ram and start the periodic task with user account.

    root@verifier:# cp /BASEDIR/verifier/OpenAttestation/CommandTool/certfile.cer /BASEDIR/verifier/ram/data/certfile.cer
root@verifier:# cp -r /BASEDIR/verifier/ram /home/user/ram
root@verifier:# su user
user@verifier:$ cd /home/user/ram
user@verifier:$ celery -A tasks worker --beat &

In order for OpenAttestation to know the certificate used by strongswan in the NED to authenticate itself, when the NED is registering to the verifier, it also needs to input the digest of the file containing his certificate (i.e. peerCert.der step 6 in NED repository) along with it, see step 7 in verifier repository. When NED revokes its certificate, it needs to be re-registered again, with the digest of the certificate, with the update_cert.sh script in /BASEDIR/verifier/OpenAttestation/CommandTool directory.

  1. The web service created by OpenAttestation, running by httpd, the configuration files are in /etc/httpd/conf.d, need to change ssl.conf by adding new ServerName attribute ServerName verifier:443, and need to copy tossl.conf to the same /etc/httpd/conf.d directory. And the web page for user to read the attestation result changes to https://verifier/OAT/result.php?CN=ned2&LEVEL=4&DGST=8b71648e9c52a24cfe259305c611483ea56ca4dc, it will provide the same result as it was. The REST API has also changed from http to https, the new URL to the REST API is https://verifier/OAT/attest.php.

  2. if OpenAttestation has been installed and running correctly, just need to copy the new php files in the /BASEDIR/verifier/OpenAttestation/Source/Portal directory into /var/www/html/OAT directory.

  3. in order to register multiple NEDs into this verifier, need to run the steps defined in NED setup in the NED README. Afterward, need to run add_NED.sh in the /BASEDIR/verifier/OpenAttestation/CommandTool directory as following.

    user@verifier$ bash add_NED.sh $selfname $attestorname $attestorIP $PCR0value $OSdistname $CERTDGST

example: bash add_NED.sh verifier ned2 xxx.xxx.xxx.xxx 7D94A15BE0295A3743FC259B07202FF42550B369 CentOS7 8b71648e9c52a24cfe259305c611483ea56ca4dc Then the new NED's name needs to be inserted into the OAT_NODE variable in BASEDIR/verifier/ram/config.py file.

Example

You need to change the ned's cert_digest.

Open https://verifier/OAT/result.php?CN=ned2&LEVEL=4&DGST=8b71648e9c52a24cfe259305c611483ea56ca4dc with a browser to see the attestation result.

  • CN is the common name of the NED
  • LEVEL is the trust level of the requirement
  • DGST is the digest of the strongSwan certificate used by the NED

Or send POST requests to https://verifier/OAT/attest.php:

```bash
user@verifier:$ PDATA='{"hosts":["ned"],"analysisType":"load-time+check-cert,l_req=l4_ima_all_ok|>=,cert_digest=efae492da504edea2c2358dea1fb1e6770780b6e"}'
user@verifier:$ curl -XPOST -H "Content-Type:application/json" -d "$PDATA" https://verifier/OAT/attest.php
```

You need to change the ned's cert_digest. Response is a JSON message structed as following: Responses will be a JSON message structured as follow:

{
	"status": "success",
	"n_results": 1,
	"results":[
		{
			"trust_lvl": "trusted",
			"host_name": "ned"
		},
	]
}

License

The MIT License (MIT)

Copyright (c) 2015 TORSEC Group (http://security.polito.it)
                   Politecnico di Torino

author:   Tao Su <[email protected]>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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Third party remote attestation verifier

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