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Update security documentation

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An update for the security documentation that is part of the CycloneDDS
manual:
- added openssl commands for creating a set of CA and identity certificates
- code fragment for setting security by qos and example of xml security config
- commands for signing governance and permissions documents using openssl

Signed-off-by: Dennis Potman <dennis.potman@adlinktech.com>
This commit is contained in:
Dennis Potman 2020-02-29 11:39:23 +01:00 • committed by eboasson
parent a0b4245600
commit 7049469289
6 changed files with 401 additions and 130 deletions
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29
docs/manual/_static/example_governance.xml Normal file
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@ -0,0 +1,29 @@
<?xml version="1.0" encoding=\"utf-8\"?>
<dds xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://www.omg.org/spec/DDS-SECURITY/20170901/omg_shared_ca_governance.xsd">
<domain_access_rules>
<domain_rule>
<domains>
<id_range>
<min>0</min>
<max>230</max>
</id_range>
</domains>
<allow_unauthenticated_participants>false</allow_unauthenticated_participants>
<enable_join_access_control>true</enable_join_access_control>
<discovery_protection_kind>NONE</discovery_protection_kind>
<liveliness_protection_kind>NONE</liveliness_protection_kind>
<rtps_protection_kind>NONE</rtps_protection_kind>
<topic_access_rules>
<topic_rule>
<topic_expression>*</topic_expression>
<enable_discovery_protection>true</enable_discovery_protection>
<enable_liveliness_protection>true</enable_liveliness_protection>
<enable_read_access_control>true</enable_read_access_control>
<enable_write_access_control>true</enable_write_access_control>
<metadata_protection_kind>SIGN</metadata_protection_kind>
<data_protection_kind>ENCRYPT</data_protection_kind>
</topic_rule>
</topic_access_rules>
</domain_rule>
</domain_access_rules>
</dds>

39
docs/manual/_static/example_permissions.xml Normal file
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@ -0,0 +1,39 @@
<?xml version="1.0" encoding="utf-8" ?>
<dds xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="https://www.omg.org/spec/DDS-SECURITY/20170901/omg_shared_ca_permissions.xsd">
<permissions>
<grant name="default_permissions">
<subject_name>emailAddress=alice@cycloneddssecurity.adlinktech.com,CN=Alice Example,O=Example Organization,OU=Organizational Unit Name,L=Locality Name,ST=OV,C=NL</subject_name>
<validity>
<!-- Format is CCYY-MM-DDThh:mm:ss[Z|(+|-)hh:mm] in GMT -->
<not_before>2020-01-01T01:00:00</not_before>
<not_after>2120-01-01T01:00:00</not_after>
</validity>
<allow_rule>
<domains>
<id_range>
<min>0</min>
<max>230</max>
</id_range>
</domains>
<publish>
<topics>
<topic>*</topic>
</topics>
<partitions>
<partition>*</partition>
</partitions>
</publish>
<subscribe>
<topics>
<topic>*</topic>
</topics>
<partitions>
<partition>*</partition>
</partitions>
</subscribe>
</allow_rule>
<default>DENY</default>
</grant>
</permissions>
</dds>

19
docs/manual/_static/security_by_config.xml Normal file
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@ -0,0 +1,19 @@
<Domain id="any">
<DDSSecurity>
<Authentication>
<Library initFunction="init_authentication" finalizeFunction="finalize_authentication" path="dds_security_auth"/>
<IdentityCA>file:/path/to/example_id_ca_cert.pem</IdentityCA>
<IdentityCertificate>file:/path/to/example_alice_cert.pem</IdentityCertificate>
<PrivateKey>file:/path/to/example_alice_priv_key.pem</PrivateKey>
</Authentication>
<Cryptographic>
<Library initFunction="init_crypto" finalizeFunction="finalize_crypto" path="dds_security_crypto"/>
</Cryptographic>
<AccessControl>
<Library initFunction="init_access_control" finalizeFunction="finalize_access_control" path="dds_security_ac"/>
<PermissionsCA>file:/path/to/example_perm_ca_cert.pem</PermissionsCA>
<Governance>file:/path/to/example_governance.p7s</Governance>
<Permissions>file:/path/to/example_permissions.p7s</Permissions>
</AccessControl>
</DDSSecurity>
</Domain>

21
docs/manual/_static/security_by_qos.c Normal file
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@ -0,0 +1,21 @@
dds_qos_t * qos = dds_create_qos();
dds_qset_prop(qos, "dds.sec.auth.library.path", "dds_security_auth");
dds_qset_prop(qos, "dds.sec.auth.library.init", "init_authentication");
dds_qset_prop(qos, "dds.sec.auth.library.finalize", "finalize_authentication");
dds_qset_prop(qos, "dds.sec.auth.identity_ca", "file:/path/to/example_id_ca_cert.pem");
dds_qset_prop(qos, "dds.sec.auth.private_key", "file:/path/to/example_alice_priv_key.pem");
dds_qset_prop(qos, "dds.sec.auth.identity_certificate", "file:/path/to/example_alice_cert.pem");
dds_qset_prop(qos, "dds.sec.crypto.library.path", "dds_security_crypto");
dds_qset_prop(qos, "dds.sec.crypto.library.init", "init_crypto");
dds_qset_prop(qos, "dds.sec.crypto.library.finalize", "finalize_crypto");
dds_qset_prop(qos, "dds.sec.access.library.path", "dds_security_ac");
dds_qset_prop(qos, "dds.sec.access.library.init", "init_access_control");
dds_qset_prop(qos, "dds.sec.access.library.finalize", "finalize_access_control");
dds_qset_prop(qos, "dds.sec.access.permissions_ca", "file:/path/to/example_perm_ca_cert.pem");
dds_qset_prop(qos, "dds.sec.access.governance", "file:/path/to/example_governance.p7s");
dds_qset_prop(qos, "dds.sec.access.permissions", "file:/path/to/example_permissions.p7s");
dds_entity_t participant = dds_create_participant(0, qos, NULL);

1
docs/manual/index.rst
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@ -21,6 +21,7 @@ Welcome to Eclipse Cyclone DDS's documentation!
GettingStartedGuide/index
ddsc
config
security
Indices and tables
==================

422
docs/manual/security.rst
View file

@ -4,7 +4,7 @@
DDS Security
############
CycloneDDS is (will be) compliant with The Object Management Group (OMG) DDS Security specification.
CycloneDDS is compliant with The Object Management Group (OMG) DDS Security specification.
This specification defines the Security Model and Service Plugin Interface (SPI) architecture for
compliant DDS implementations. The DDS Security Model is enforced by the invocation of these SPIs
@ -109,25 +109,28 @@ ID CA gets Alice's subject information and public key and generates an IdentityC
Alice's certificate includes her public key and certificate of ID CA; so that her certificate can
be verified if it is really issued by ID CA.
Access Control is configured with governance and permissions files.
Governance file defines the security behavior of domains and topics.
Permissions file contains the permissions of the domain participant, topics, readers and writers,
binds them to identity certificate by subject name (distinguished name).
Access Control is configured with governance and permissions files. Governance file defines the
security behavior of domains and topics. Permissions file contains the permissions of the domain
participant, topics, readers and writers, binds them to identity certificate by subject name
(distinguished name).
Governance files and Permissions files are signed by Permission CA. Signed documents also
contains Permissions CA certificate; so that they can be verified if they are really issued
by Permissions CA.
Authenticated participants handshakes with each other and generates a shared key by Diffie-Hellman
key exchange. This shared key is used for encrypting/decrypting data with AES.
Authenticated participants perform a handshake with each other and generate a shared key by
Diffie-Hellman key exchange. This shared key is used for encrypting/decrypting data with AES.
During the handshake Alice checks Bob's certificate and Bob's Permissions file if they are really
issued by the ID CA certificate and Permissions CA Certificate that **she** has. Also Bob checks
Alice's certificate and Alice's Permissions file if they are really issued by the ID CA certificate
and Permissions CA that **he** has.
Permissions file can contain permissions for several identities; so subject name of identity
Permissions files can contain permissions for several identities; so subject name of identity
certificate exist in permissions file to establish a binding between identity and its permissions.
There are several ways to set up the certificates and signed configuration files to be used with
Cyclone DDS Security. One of them is using OpenSSL, which is described in section
`Creating certificates using OpenSSL`_.
*************
Configuration
@ -142,29 +145,21 @@ The configuration of DDS Security is split up into two parts.
- `Plugins Configuration`_
- `Access Control Configuration`_
This section explains the configuration in details. However, you can see a concrete example on
security section of Example Readme file.
.. _`Plugins Configuration`:
Plugins Configuration
*********************
TODO: Update to reflect the configuration through QoS policies.
CycloneDDS gets the security configuration from DDS2I XML configuration elements or from
the participant QoS policies as stated in the DDS Security specification.
| CyclonDDS gets the plugin configuration from DDS2I configuration elements or the Participant QoS
Policies as stated in the DDS Security specification.
| This behavior allows applications to use DDS Security without update. Only supplying a new
configuration with DDS Security enabled is enough to switch from a non-secure to a secure
deployment. However, the same DDS Security configuration is forced upon all the participants
within the federation.
| The configuration options are bundled in the ``DDSSecurity`` configuration section in DDS2I.
| Every DDS Security plugin has its own configuration sub-section.
This behavior allows applications to use DDS Security without recompiling the binaries.
Only supplying a new configuration with DDS Security enabled is enough to switch from a
non-secure to a secure deployment. The configuration is at domain level, which means
that all participants created for that domain receive the same DDS security settings.
The configuration options for a domain are bundled in the ``DDSSecurity`` configuration
section in the CycloneDDS configuration. Every DDS Security plugin has its own configuration
sub-section.
.. _`Authentication Properties`:
@ -172,35 +167,31 @@ TODO: Update to reflect the configuration through QoS policies.
Authentication Properties
=========================
| To authenticate CycloneDDS, it has to be configured with IdentityCertificate
(DDSSecurity/Authentication/IdentityCertificate - see Configuration Guide - DDS Security).
This IdentityCertificate is used to authenticate all participants of that particular
CycloneDDS domain.
To enable authentication for a node, it has to be configured with an identity certificate
(``DDSSecurity/Authentication/IdentityCertificate``). This identity certificate is used to
authenticate all participants of that particular CycloneDDS domain. Associated with the
identity certificate is the corresponding private key
(``DDSSecurity/Authentication/PrivateKey``). The private key may either be a 2048-bit RSA
or a 256-bit Elliptic Curve Key with a prime256v1 curve.
| Associated with the IdentityCertificate is the corresponding PrivateKey
(DDSSecurity/Authentication/PrivateKey).
The PrivateKey may either be a 2048-bit RSA or a 256-bit Elliptic Curve Key with
a prime256v1 curve.
The certificate of identity CA, which is the issuer of the node's identity certificate,
is configured in ``DDSSecurity/Authentication/IdentityCA``. The public key of the
identity CA (as part of its certificate) shall either be a 2048-bit RSA key or a 256-bit
Elliptic Curve Key for the prime256v1 curve. The identity CA certificate can be a
self-signed certificate.
| IdentityCA (DDSSecurity/Authentication/IdentityCA) is the certificate of Identity Certificate
Authority (CA) which is the issuer of the IdentityCertificate. The public key of the
IdentityCA shall either be a 2048-bit RSA key or a 256-bit Elliptic Curve Key for the prime256v1
curve. The identity_ca can be a self-signed certificate.
The identity certificate, private key and the identity CA should be a X509 document in PEM
format. It may either be specified directly in the configuration file (as CDATA, prefixed
with ``data:,``) or the configuration file should contain a reference to a corresponding
file (prefixed with ``file:``).
| Currently the IdentityCertificate, IdentityCA and PrivateKey should be a X509 document in pem
format.
It may either be specified directly in the configuration file or the configuration file should
contain a reference to a corresponding file.
| Optionally the PrivateKey could be protected by a password (DDSSecurity/Authentication/Password).
| Furthermore the CycloneDDS configuration allows to configure a directory containing additional
IdentityCA's
which are used to verify the identity certificates that are received by remote instances
(DDSSecurity/Authentication/TrustedCADirectory). This option allows to use more than one identity
CA throughout the system. TrustedCADirectory is an extension to DDS Security specification; so it
can not be used when communicating with other vendors.
Optionally the private key could be protected by a password
(``DDSSecurity/Authentication/Password``).
Furthermore the CycloneDDS configuration allows to configure a directory containing additional
identity CA's which are used to verify the identity certificates that are received by remote instances
(``DDSSecurity/Authentication/TrustedCADirectory``). This option allows to use more than one identity
CA throughout the system.
.. _`Access Control Properties`:
@ -208,11 +199,11 @@ Authentication Properties
Access Control Properties
=========================
Governance Document (DDSSecurity/AccessControl/Governance),
Permissions Document (DDSSecurity/AccessControl/Permissions) and
Permissions CA Certificate (DDSSecurity/AccessControl/PermissionsCA) are required for access
control plugin. See DDS Security section of Configuration Guide for property descriptions. They
can be provided by data itself (with CDATA) or path to file on disk.
A governance document (``DDSSecurity/AccessControl/Governance``), a permissions document
(``DDSSecurity/AccessControl/Permissions``) and the permissions CA certificate
(``DDSSecurity/AccessControl/PermissionsCA``) are required for the access control plugin.
Similar to the authentication plugin properties, these values can be provided as CDATA or
by using a path to a file.
.. _`Cryptography Properties`:
@ -221,7 +212,7 @@ can be provided by data itself (with CDATA) or path to file on disk.
Cryptography Properties
=======================
Cryptography plugin has no property
The cryptography plugin has no properties in the configuration.
.. _`Access Control Configuration`:
@ -229,15 +220,15 @@ Cryptography plugin has no property
Access Control Configuration
****************************
| Access Control configuration consists of Governance document and Permissions document.
Both governance and permissions files must be signed by the Permissions CA in S/MIME format.
Participants use their own permissions CA to validate remote permissions. So, all permissions CA
Certificates must be same for all participants.
Access Control configuration consists of Governance document and Permissions document.
Both governance and permissions files must be signed by the Permissions CA in S/MIME format.
Participants use their own permissions CA to validate remote permissions. So, all permissions CA
Certificates must be same for all participants.
| The signed document should use S/MIME version 3.2 format as defined in IETF RFC 5761 using
SignedData Content Type (section 2.4.2 of IETF RFC 5761) formatted as multipart/signed (section
3.4.3 of IETF RFC 5761). This corresponds to the mime-type application/pkcs7-signature.
Additionally the signer certificate should be be included within the signature.
The signed document should use S/MIME version 3.2 format as defined in IETF RFC 5761 using
SignedData Content Type (section 2.4.2 of IETF RFC 5761) formatted as multipart/signed (section
3.4.3 of IETF RFC 5761). This corresponds to the mime-type application/pkcs7-signature.
Additionally the signer certificate should be be included within the signature.
===================
@ -245,10 +236,12 @@ Governance Document
===================
Governance document defines the security behavior of domains and topics. It is an XML document and
its format is specified in OMG DDS Security Version 1.1 Section 9.4.1.2.3
its format is specified in OMG DDS Security Version 1.1 Section 9.4.1.2.3.
The attributes that specified in Governance document must match with the remote one for
establishing communication.
This section describes the properties that can be specified in a permissions document. An example
of a governance document is provided in `Create a signed governance document`_. The options
that are specified in Governance document must match with the remote node to establishing
communication.
Protection Kinds
@ -345,9 +338,8 @@ Topic Attributes
There are different settings for different domain ranges. The domain rules are evaluated in the
same order as they appear in the document. A rule only applies to a particular DomainParticipant
if the domain Section matches the DDS domain_id to
which the DomainParticipant belongs. If multiple rules match, the first rule that matches is the
only one that applies.
if the domain Section matches the DDS domain_id to which the participant belongs. If multiple
rules match, the first rule that matches is the only one that applies.
The topic access rules are evaluated in the same order as they appear within the
<topic_access_rules> Section. If multiple rules match the first rule that matches is the only one
@ -378,6 +370,9 @@ The permissions document is an XML document containing the permissions of the do
and binding them to the subject name of the DomainParticipant as defined in the identity
certificate. Its format is specified in OMG DDS Security Version 1.1 Section 9.4.1.3.
This section describes the properties that can be specified in a permissions document. An example
of a permissions document is provided in `Creating a signed permissions document`_.
Validity period
===============
@ -394,20 +389,19 @@ The subject name must match with Identity Certificate subject. It is checked dur
participant and during handshake with remote participant. Use the following openssl command to get
subject name from identity certificate:
``openssl x509 -noout -subject -nameopt RFC2253 -in <identity_certificate_file.crt>``
``openssl x509 -noout -subject -nameopt RFC2253 -in <identity_certificate_file.pem>``
Rules
=====
DomainParticipant permissions are defined by set of rules.
The rules are applied in the same order that appear in the document. If the criteria for the rule
matches the domain_id join and/or publish or subscribe operation that is being attempted, then the
allow or deny decision is applied. If the criteria for a rule does not match the operation being
attempted, the evaluation shall proceed to the next rule. If all rules have been examined without
a match, then the decision specified by the “default” rule is applied. The default rule, if
present, must appear after all allow and deny rules. If the default rule is not present, the
Participant permissions are defined by set of rules. The rules are applied in the same order
that appear in the document. If the criteria for the rule matches the domain_id join and/or publish
or subscribe operation that is being attempted, then the allow or deny decision is applied.
If the criteria for a rule does not match the operation being attempted, the evaluation
shall proceed to the next rule. If all rules have been examined without a match, then the
decision specified by the “default” rule is applied. The default rule, if present, must
appear after all allow and deny rules. If the default rule is not present, the
implied default decision is DENY. The matching criteria for each rule specify the domain_id,
topics (published and subscribed), the partitions (published and subscribed), and the data-tags
associated with the DataWriter and DataReader.
@ -420,11 +414,11 @@ the expressions with the <topics> section).
`fnmatch pattern matching`_ can be used for topic expressions and partition expressions.
Interactions with DDS Security
******************************
Logging and tracing
*******************
DDS Security provides the responses through CycloneDDS error and info log. Users can get
messages for:
The security implementation uses the standard logging and tracing mechanism in CycloneDDS.
The following is written to log and trace:
- Configuration errors such as plugin library files, certificate files, governance and permissions
files that can not be found on filesystem.
@ -433,17 +427,16 @@ messages for:
readers and writers.
- Integrity errors such as Permissions file-Permissions CA and Identity Cert-Identity CA integrity.
Local subscription, publication and topic permission errors are written to error log.
Remote participation, subscription and publication permission errors are written to info log as
warning message.
Local subscription, publication and topic permission errors are written as errors.
Remote participation, subscription and publication permission errors are written to log as
warning messages.
Data Communication And Handshake Process
*******************************************
****************************************
Authentication handshake between participants starts after participant discovery.
If a reader and a writer created during that period, their match will be delayed until after the
handshake succeeds.
Authentication handshake between participants starts after participant discovery. If a reader and
a writer created during that period, their match will be delayed until after the handshake succeeds.
This means, during the handshake process, volatile data will be lost, just like there is no reader.
After publication match, the encryption / decryption keys are exchanged between reader and writer.
@ -452,12 +445,11 @@ resent.
DDS Secure Discovery
******************************
********************
Just like normal operation, DDSI will discover local and remote participants, topics, readers and
writers.
However, when DDS Security is enabled, it is more complex and will take a longer time (especially
due to the handshaking that has to happen).
writers. However, when DDS Security is enabled, it is more complex and will take a longer time
(due to the handshaking that is required).
With every new node in the system, the discovery takes exponentially longer. This can become a
problem if the system contains a number of slow platforms or is large.
@ -467,30 +459,199 @@ Internal/SquashParticipants configuration.
Proprietary builtin endpoints
******************************
*****************************
| The DDS standard contains some builtin endpoints. A few are added by the DDS Security
specification. The behaviour of all these builtin endpoints are specified (and thus are be
handled by the plugins that implement the DDS Security specification), meaning that they
don't have to be present in the Governance or Permissions documents and the users don't
have to be bothered with them.
|
| A few of these builtin endpoints slave according to the <discovery_protection_kind> within
the Governance document. In short, related submessages are protected according to the value
of <discovery_protection_kind>. This protects meta information that is send during the
discovery phase.
The DDS standard contains some builtin endpoints. A few are added by the DDS Security
specification. The behaviour of all these builtin endpoints are specified (and thus are be
handled by the plugins that implement the DDS Security specification), meaning that they
don't have to be present in the Governance or Permissions documents and the users don't
have to be bothered with them.
A few of these builtin endpoints slave according to the <discovery_protection_kind> within
the Governance document. In short, related submessages are protected according to the value
of <discovery_protection_kind>. This protects meta information that is send during the
discovery phase.
*******************
DataTag Permissions
*******************
| Data Tags provide an extra (optional) level of identification. This can mean f.i. that
a certain reader is not allowed to read data from writer A but it is allowed to read from
writer B (all the same topic).
|
| This optional feature is not yet supported.
Data Tags provide an extra (optional) level of identification. This can mean f.i. that
a certain reader is not allowed to read data from writer A but it is allowed to read from
writer B (all the same topic).
This optional feature is not yet supported.
.. _`Example configuration`:
*********************
Example configuration
*********************
This sections show an example configuration for DDS Security in Cyclone DDS. First step is
creating the required CA and identity certificates. Then a governance and permissions document
is created to configure access control. Next an example configuration (XML) that
is using these assets is shown, and a code fragment that shows how to set the security
properties by using the participant QoS.
.. _`Creating certificates using OpenSSL`:
Creating certificates using OpenSSL
***********************************
This section describes how to generate a set of CA and identity certificates using OpenSSL,
and how to use OpenSSL to sign the governance and access control configuration files.
First step is generation of the CA for identity management (authentication). First we create the
private key for the CA by:
.. code-block:: bash
openssl genrsa -out example_id_ca_priv_key.pem 2048
Next we can generate the certificate for the identity CA (which is in this case a self-signed
certificate):
.. code-block:: bash
openssl req -x509 -key example_id_ca_priv_key.pem -out example_id_ca_cert.pem -days 3650 -subj "/C=NL/ST=OV/L=Locality Name/OU=Example OU/O=Example ID CA Organization/CN=Example ID CA/emailAddress=authority@cycloneddssecurity.adlinktech.com"
We repeat these steps for generating the private key of the permissions CA (used for
signing the AccessControl configiguration files):
.. code-block:: bash
openssl genrsa -out example_perm_ca_priv_key.pem 2048
And the self-signed certificate for the permissions CA:
.. code-block:: bash
openssl req -x509 -key example_perm_ca_priv_key.pem -out example_perm_ca_cert.pem -days 3650 -subj "/C=NL/ST=OV/L=Locality Name/OU=Example OU/O=Example CA Organization/CN=Example Permissions CA/emailAddress=authority@cycloneddssecurity.adlinktech.com"
==============================
Create an Identity Certificate
==============================
Now that we have set up the CA for identity management, we can create an identity certificate
signed by this CA and the private key corresponding to this identity. Here we are creating
a private key and certificate for identity named Alice. These steps need to be repeated for each
identity in the system.
Generating the private key for Alice's identity:
.. code-block:: bash
openssl genrsa -out example_alice_priv_key.pem 2048
Now we create a 'certificate signing request' (CSR) to request the identity CA to generate a certificate:
.. code-block:: bash
openssl req -new -key example_alice_priv_key.pem -out example_alice.csr -subj "/C=NL/ST=OV/L=Locality Name/OU=Organizational Unit Name/O=Example Organization/CN=Alice Example/emailAddress=alice@cycloneddssecurity.adlinktech.com"
Next Alice's identity certificate is created:
.. code-block:: bash
openssl x509 -req -CA example_id_ca_cert.pem -CAkey example_id_ca_priv_key.pem -CAcreateserial -days 3650 -in example_alice.csr -out example_alice_cert.pem
Now the file 'example_alice_cert.pem' can be used as ``IdentityCertificate`` in the DDS Security
authentication configuration and 'example_alice_priv_key.pem' for the ``PrivateKey`` setting. The
certificate of the CA used for signing this identity, 'example_id_ca_cert.pem' in this example,
should be used for the ``IdentityCA`` configuration setting.
.. _`Create a signed governance document`:
===================================
Create a signed governance document
===================================
An example of a governance document that is using signing for submessage and encrypted payload:
.. literalinclude:: _static/example_governance.xml
:linenos:
:language: xml
As mentioned before, the governance document needs to be signed by the permissions CA
that was created above. This can be done by using this openssl command:
.. code-block:: bash
openssl smime -sign -in example_governance.xml -text -out example_governance.p7s -signer example_perm_ca_cert.pem -inkey example_perm_ca_priv_key.pem
.. _`Creating a signed permissions document`:
======================================
Creating a signed permissions document
======================================
The permissions document is an XML document that contains the permissions of the participant and
binds them to the subject name of the identity certificate (distinguished name) for the participant
as defined in the DDS:Auth:PKI-DH authentication plugin.
An example of a permissions document:
.. literalinclude:: _static/example_permissions.xml
:linenos:
:language: xml
This document also needs to be signed by the permissions CA:
.. code-block:: bash
openssl smime -sign -in example_permissions.xml -text -out example_permissions.p7s -signer example_perm_ca_cert.pem -inkey example_perm_ca_priv_key.pem
Example DDS Security configuration
**********************************
With the above steps we have all certificates and documents that are required when configuring
security. In the next two sections, both configuring security by properties and configuring
security by DDS configuration are covered.
======================================
Security properties in participant QoS
======================================
This code fragment shows how to set the security properties to a QoS object and use this QoS
when creating a participant:
.. literalinclude:: _static/security_by_qos.c
:linenos:
:language: c
===========================================
Configure security in Cyclone configuration
===========================================
As an alternative for using the QoS, security settings can also be applied using the CycloneDDS
configuration XML. In case both QoS and the configuration XML contain security settings, the values
from the QoS will be used and the security settings in the configuration XML are ignored.
The following XML fragment shows how to set security settings through configuration:
.. literalinclude:: _static/security_by_config.xml
:linenos:
:language: xml
To use this configuration file for an application, set the CYCLONEDDS_URI environment
variable to this config file:
.. code-block:: bash
export CYCLONEDDS_URI=/path/to/secure_config.xml
Bacause this example configuration uses the attribute ``id=any`` for the ``domain`` element, any participant
that is created (which implicitly creates a domain) in an application using this configuration gets
these security settings.
***************************
External Plugin Development
@ -502,7 +663,7 @@ The plugins are loaded in the run-time. However, you can also implement your own
implementing the given API according to OMG DDS Security specification.
You can implement all of the plugins or just one of them.
| The followings are the key points for implementing you own plugin:
The followings are the key points for implementing you own plugin:
Interface
@ -516,24 +677,23 @@ dds_security_api_cryptography.h header files accordingly.
Init and Finalize
*****************
| A plugin should have an init and a finalize functions. plugin_init and plugin_finalize
interfaces are given in dds_security_api.h header file and function should be same as in
configuration file.
| Init function is called once, just after the plugin is loaded. Finalize function is
called once, just before the plugin is unloaded.
A plugin should have an init and a finalize functions. plugin_init and plugin_finalize
interfaces are given in dds_security_api.h header file and function should be same as in
configuration file.
Init function is called once, just after the plugin is loaded. Finalize function is
called once, just before the plugin is unloaded.
Inter Plugin Communication
**************************
| There is a shared object (*DDS_Security_SharedSecretHandle*) within authentication and
cryptography plugins. If you want to implement only one of them and use the builtin for the
other one, you have to get or provide the shared object properly.
| *DDS_Security_SharedSecretHandle* is the integer representation of
*DDS_Security_SharedSecretHandleImpl* struct object. Cryptography plugin gets the
*DDS_Security_SharedSecretHandle* from authentication plugin and casts to
*DDS_Security_SharedSecretHandleImpl* struct. Then all needed information can be retieved
through *DDS_Security_SharedSecretHandleImpl* struct:
There is a shared object (*DDS_Security_SharedSecretHandle*) within authentication and
cryptography plugins. If you want to implement only one of them and use the builtin for the
other one, you have to get or provide the shared object properly.
*DDS_Security_SharedSecretHandle* is the integer representation of
*DDS_Security_SharedSecretHandleImpl* struct object. Cryptography plugin gets the
*DDS_Security_SharedSecretHandle* from authentication plugin and casts to
*DDS_Security_SharedSecretHandleImpl* struct. Then all needed information can be retieved
through *DDS_Security_SharedSecretHandleImpl* struct:
::
@ -549,9 +709,9 @@ Inter Plugin Communication
Error Codes
***********
| Most of the plugin functions have parameter for reporting exception. The following exception
codes should be used in the reported exception data according to the situation.
dds_security_api_err.h header file contains the code and message constants.
Most of the plugin functions have parameter for reporting exception. The following exception
codes should be used in the reported exception data according to the situation.
dds_security_api_err.h header file contains the code and message constants.
+-------+----------------------------------------------------------------+
| Code | Message |
@ -638,9 +798,11 @@ Error Codes
+-------+----------------------------------------------------------------+
| 149 | Could not find valid grant in permissions |
+-------+----------------------------------------------------------------+
| 150 | Permissions of subject (%s) outside validity date: %s - %s |
| 150 | Unsupported URI type: %s |
+-------+----------------------------------------------------------------+
| 151 | Unsupported URI type: %s |
| 151 | The payload is not aligned at 4 bytes |
+-------+----------------------------------------------------------------+
| 200 | Undefined Error Message |
+-------+----------------------------------------------------------------+
.. EoF