Bundesamt für Sicherheit in der Informationstechnik
BSI-PP-0013-2005
Low Assurance Protection Profile
for a
VPN gateway,
Version 1.4
developed by
SRC Security Research & Consulting GmbH
- Bundesamt für Sicherheit in der Informationstechnik, Postfach 20 03 63, D-53133 Bonn
Telefon +49 228 9582-0, Infoline +49 228 9582-111, Telefax +49 228 9582-455
Bundesamt für Sicherheit in der Informationstechnik
Certificate BSI-PP-0013-2005
Low Assurance Protection Profile
for a VPN gateway,
Version 1.4
developed by
SRC Security Research & Consulting GmbH
Assurance Package : EAL1
Common Criteria Arrangement
Bonn, June 15th
, 2005
The President of the Federal Office
for Information Security
Dr. Helmbrecht L.S.
The Protection Profile mentioned above was evaluated at an accredited and licenced/approved evaluation facility using
the Common Methodology for IT Security Evaluation, Version 2.4 Revision 256 including Draft Interpretations #1 - #17
for conformance to the Common Criteria for IT Security Evaluation, Version 2.4, Revision 256.
This certificate applies only to the specific version and release of the Protection Profile and in conjunction with the
complete Certification Report.
The evaluation has been conducted in accordance with the provisions of the certification scheme of the Federal Office for
Information Security. The conclusions of the evaluation facility in the evaluation technical report are consistent with the
evidence adduced.
This certificate is not an endorsement of the Protection Profile by the Federal Office for Information Security or any other
organisation that recognises or gives effect to this certificate, and no warranty of the Protection Profile by the Federal
Office for Information Security or any other organisation that recognises or gives effect to this certificate, is either
expressed or implied.
Bundesamt für Sicherheit in der Informationstechnik
Godesberger Allee 185 - 189 – D-53175 Bonn – Postfach 20 03 63 – D-53133 Bonn
Telefon (0228) 9582-0 – Telefax (0228) 9582-455 – Infoline (0228) 9582-111
BSI-PP-0013-2005 Certification Report
Preliminary Remarks
Under the BSIG1
Act, the Federal Office for Information Security (BSI) has the
task of issuing certificates for information technology products as well as for
Protection Profiles (PP).
A PP defines an implementation-independent set of IT security requirements for
a category of TOEs which are intended to meet common consumer needs for IT
security. The development and certification of a PP or the reference to an
existent one gives consumers the possibility to express their IT security needs
without referring to a special product. Product or system certifications can be
based on Protection Profiles. For products which have been certified based on
a Protection Profile an individual certificate will be issued.
Certification of the Protection Profile is carried out on the instigation of the BSI.
A part of the procedure is the technical examination (evaluation) of the
Protection Profile according to Common Criteria [1].
According to the decree issued by the Bundesministerium des Innern (Federal
Ministry of the Interior) on February 22nd
, 2005 the BSI is authorised to issue
certificates on the basis of CC, Version 2.4, Revision 256.
The evaluation is carried out by an evaluation facility recognised by the BSI or
by the BSI itself.
The result of the certification procedure is the present Certification Report. This
report contains among others the certificate (summarised assessment) and the
detailed Certification Results.
1
Act setting up the Federal Office for Information Security (BSI-Errichtungsgesetz, BSIG) of
December 17
th
, 1990, Bundesgesetzblatt I p. 2834
V
Certification Report BSI-PP-0013-2005
Contents
Part A: Certification
Part B: Certification Results
Annex: Protection Profile
VI
BSI-PP-0013-2005 Certification Report
A Certification
1 Specifications of the Certification Procedure
The certification body conducts the procedure according to the criteria laid down
in the following:
· BSIG2
· BSI Certification Ordinance3
· BSI Schedule of Costs4
· Special decrees issued by the Bundesministerium des Innern (Federal
Ministry of the Interior)
· DIN EN 45011
· BSI Certification – Description of the Procedure [3]
· Procedure for the Issuance of a PP certificate by the BSICommon
Criteria for Information Technology Security Evaluation, Version 2.4,
Revision 256 [1]
· Common Methodology for IT Security Evaluation, Version 2.4, Revision
256 with the CC v2.4 Draft Interpretations #1 - #17 [2]
2
Act setting up the Federal Office for Information Security (BSI-Errichtungsgesetz, BSIG) of
December 17
th
, 1990, Bundesgesetzblatt I p. 2834
3
Ordinance on the Procedure for Issuance of a Certificate by the Federal Office for
Information Security (BSI-Zertifizierungsverordnung, BSIZertV) of July 07
th
, 1992,
Bundesgesetzblatt I p. 1230
4
Schedule of Cost for Official Procedures of the Federal Office for Information Security (BSI-
Kostenverordnung, BSI-KostV) of March 03
rd
, 2005, Bundesgesetzblatt I p. 519
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Certification Report BSI-PP-0013-2005
2 Recognition Agreements
In order to avoid multiple certification of the same Protection Profile in different
countries a mutual recognition of Protection Profile certificates under certain
conditions was agreed.
An arrangement (Common Criteria Arrangement) on the mutual recognition of
certificates based on the CC evaluation assurance levels up to and including
EAL 4 was signed in May 2000. It includes also the recognition of Protection
Profiles based on the CC. The arrangement was signed by the national bodies
of Australia, Canada, Finland France, Germany, Greece, Italy, The Netherlands,
New Zealand, Norway, Spain, United Kingdom and the United States. Israel
joined the arrangement in November 2000, Sweden in February 2002, Austria
in November 2002, Hungary and Turkey in September 2003, Japan in
November 2003, the Czech Republic in September 2004, the Republic of
Singapore in March 2005 and India in April 2005.
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BSI-PP-0013-2005 Certification Report
3 Performance of Evaluation and Certification
The certification body monitors each individual evaluation to ensure a uniform
procedure, a uniform interpretation of the criteria and uniform ratings.
The Low Assurance Protection Profile for a VPN gateway, Version 1.4 has
undergone the certification procedure at the BSI.
The evaluation of the Low Assurance Protection Profile for a VPN gateway,
Version 1.4 was conducted by the TNO ITSEF BV. The evaluation facility of
TNO ITSEF BV is an evaluation facility (ITSEF)5
recognised by BSI.
Author is SRC Security Research & Consulting GmbH.
The certification was concluded with
· the comparability check and
· the preparation of this Certification Report.
This work was completed by the BSI on June 15th
, 2005.
5
Information Technology Security Evaluation Facility
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Certification Report BSI-PP-0013-2005
4 Publication
The following Certification Results contain pages B-1 to B-8.
The Low Assurance Protection Profile for a VPN gateway, Version 1.4 has been
included in the BSI list of certified and registered Protection Profiles, which is
published regularly (see also Internet: http:// www.bsi.bund.de). Further
information can be obtained via the BSI-Infoline +49 228/9582-111.
Further copies of this Certification Report may be ordered from the BSI6
. The
Certification Report may also be obtained in electronic form at the internet
address stated above.
6
- Bundesamt für Sicherheit in der Informationstechnik, Postfach 20 03 63, D-53133 Bonn
Telefon +49 228 9582-0, Infoline +49 228 9582-111, Telefax +49 228 9582-455
A-4
BSI-PP-0013-2005 Certification Report
B Certification Results
Content of the Certification Results
1 PP Overview................................................................................................ 2
2 Security Functional Requirements............................................................... 4
3 Assurance Package .................................................................................... 4
4 Strength of Functions .................................................................................. 4
5 Results of the Evaluation............................................................................. 4
6 Definitions.................................................................................................... 6
7 Bibliography................................................................................................. 7
B-1
Certification Report BSI-PP-0013-2005
1 PP Overview
This Low Assurance Protection Profile for a VPN gateway, Version 1.4 is
established by SRC Security Reasearch & Consulting GmbH as basis for the
development of STs for a VPN gateway which is used to build up a virtual
private network as depicted in figure 1 on the next page. A Virtual Private
Network, or VPN, is a private communication network communicating over a
public network, i.e. the Internet. Normally, a local network is protected against
unauthorised access from the public network by means of a firewall which limits
the permitted types of traffic. The TOE provides a remote authorised user a full
connection into the local network without bypassing this protection against
unauthorised users.
This connection is established by a so called VPN tunnel between a VPN
gateway on the side of the network and a VPN client on the side of the remote
user, which is a reduced form of a gateway. Also two networks can be
connected via two VPN gateways, in which case, one of the VPN gateways
plays the role of the server and the other gateway plays the role of the client.
There is no difference in the functionality offered by the VPN client irrespective
of whether the remote VPN client is actually a single personal computer running
a trusted VPN client software application or a VPN gateway device attached to
a remote LAN.
The TOE provides the following functionality:
· identifying and authenticating remote VPN users or networks,
· building up VPN tunnels between the TOE and the VPN client by exchanging
cryptographic keys and using agreed cryptographic algorithms and
· routing network traffic between the two sides of the VPN tunnel.
The VPN message traffic is carried on public networking infrastructure using
standard protocols. VPNs use cryptographic tunnelling protocols to provide the
necessary confidentiality (preventing snooping), sender authentication
(preventing identity spoofing), and message integrity (preventing message
alteration) to achieve the privacy intended. Such techniques can provide secure
communications over possibly insecure networks.
Typical VPN protocols are:
· IPSec (IP security), the most common protocol specified by an IETF
working group,
· OpenVPN, a SSL based encryption available for many operating
systems,
· and proprietary protocols like
o PPTP (point-to-point tunneling protocol) or
o L2F (Layer 2 Forwarding) as well as
o L2TP (Layer 2 Tunnelling Protocol).
The TOE requires a supporting computing platform equipped with a connection
to the public network as well as the local network to provide its functionality.
Furthermore, the communication between the local network and the public
network will be only through the TOE. This object will be supported by the use
of a firewall that is configured to allow the minimum set of traffic to pass that is
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BSI-PP-0013-2005 Certification Report
required for the operation of the TOE and any other services that are exposed
to the outside world.
Further non-TOE hardware/firmware/software is not required by the TOE.
TOE
VPN client
Internet
local network
remote user
VPN tunnel
Figure 1: The TOE and its operational environment
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Certification Report BSI-PP-0013-2005
2 Security Functional Requirements
This section contains the functional requirements that must be satisfied by a
TOE claiming compliance to the Low Assurance Protection Profile for a VPN
gateway, Version 1.4.
All functional requirements are drawn from Common Criteria Part 2.
SFRs Component-Name
FDP_ACC.1 Subset access control
FDP_ACF.1 Security attribute based access control
FIA_ATD.1 User attribute definition
FIA_UAU.2 User authentication before any action
FIA_UID.2 User identification before any action
FMT_MSA.1 Management of security attributes
FMT_MSA.3 Static attribute initialisation
FMT_SMF.1 Specification of management functions
FMT_SMR.1 Security roles
FPT_RVM.1 Non-bypassability of the TSP
FPT_SEP.1 TSF domain separation
FTP_ITC.1 Inter-TSF trusted channel
3 Assurance Package
The security assurance requirements are based entirely on the assurance
components defined in Part 3 of the Common Criteria. The assurance require-
ments are assurance level EAL1 (Evaluation Assurance Level 1).
4 Strength of Functions
The strength of function examination is no more part of the CC, Version 2.4,
Revision 256.
5 Results of the Evaluation
The Evaluation Technical Report (ETR) [7] was provided by the ITSEF
according to the Common Criteria [1], the Methodology [2], the requirements of
the scheme [3] and all interpretations and guidelines of the scheme [4] as
relevant for the TOE.
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BSI-PP-0013-2005 Certification Report
The verdicts for the CC, Part 3 assurance components (according to EAL1 and
the class ASE for the Security Target evaluation) are summarised in the
following table.
CC Aspect Result
CC Class APE PASS.
APE_CCL.1 PASS.
APE_ECD.1 PASS.
APE_INT.1 PASS.
APE_OBJ.0 PASS.
APE_REQ.1 PASS.
The Low Assurance Protection Profile for a VPN gateway, Version 1.4 meets
the requirements for Protection Profiles as specified in class APE and Draft
Interpretation #2 of the CC, Version 2.4, Revision 256.
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Certification Report BSI-PP-0013-2005
6 Definitions
6.1 Acronyms
CC Common Criteria for IT Security Evaluation
EAL Evaluation Assurance Level
IT Information Technology
ITSEF Information Technology Security Evaluation Facility
LAPP Low Assurance Protection Profile
PP Protection Profile
SF Security Function
SFP Security Function Policy
ST Security Target
TOE Target of Evaluation
6.2 Glossary
Augmentation - The addition of one or more assurance component(s) from
Part 3 to an EAL or assurance package.
Extension - The addition to an ST or PP of functional requirements not
contained in Part 2 and/or assurance requirements not contained in Part 3 of
the CC.
Formal - Expressed in a restricted syntax language with defined semantics
based on well-established mathematical concepts.
Informal - Expressed in natural language.
Object - An entity within the TSC that contains or receives information and
upon which subjects perform operations.
Protection Profile - An implementation-independent set of security require-
ments for a category of TOEs that meet specific consumer needs.
Security Function - A part or parts of the TOE that have to be relied upon for
enforcing a closely related subset of the rules from the TSP.
Security Target - A set of security requirements and specifications to be used
as the basis for evaluation of an identified TOE.
Semiformal - Expressed in a restricted syntax language with defined seman-
tics.
Subject - An entity within the TSC that causes operations to be performed.
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BSI-PP-0013-2005 Certification Report
Target of Evaluation - An IT product or system and its associated
administrator and user guidance documentation that is the subject of an evalua-
tion.
TOE Security Functions - A set consisting of all hardware, software, and firm-
ware of the TOE that must be relied upon for the correct enforcement of the
TSP.
TOE Security Policy - A set of rules that regulate how assets are managed,
protected and distributed within a TOE.
TSF Scope of Control - The set of interactions that can occur with or within a
TOE and are subject to the rules of the TSP.
7 Bibliography
[1] Common Criteria for Information Technology Security Evaluation,
Version 2.4, Revision 256
[2] Common Methodology for Information Security Evaluation,
Version 2.4, Revision 256 with the CC v2.4 Draft Interpretations
#1 - #17
[3] BSI Certification – Description of the Procedure (BSI 7125)
[4] Applicaton Notes and Interpretations of the Scheme (AIS) as
relevant for the TOE
[5] German IT Security Certificates (BSI 7148, BSI 7149)
[6] Low Assurance Protection Profile for a VPN gateway, Version
1.4, 29.04.2005
[7] Evaluation Technical Report (ETR), Version 2.0, 01.06.2005
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Certification Report BSI-PP-0013-2005
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B-8
BSI-PP-0013-2005 Certification Report
Annex: Protection Profile
C-1