openSolaris 2008 - Configuring IKE With Public Key Certificates - System Administration Guide: IP Services

Configuring IKE With Public Key Certificates

Public key certificates eliminate the need for communicating systems to share secret keying material out of band. Unlike preshared keys, a public key certificate can be used on a mobile machine or on a system that might be renumbered.

Public key certificates can also be stored on attached hardware. For the procedure, see Configuring IKE to Find Attached Hardware (Task Map).

How to Configure IKE With Self-Signed Public Key Certificates

Self-signed certificates require less overhead than public certificates from a CA, but do not scale very easily.

On the system console, assume the Primary Administrator role or become superuser.
The Primary Administrator role includes the Primary Administrator profile. To create the role and assign the role to a user, see Chapter 2, Working With the Solaris Management Console (Tasks), in System Administration Guide: Basic Administration.

Note - Logging in remotely exposes security-critical traffic to eavesdropping. Even if you somehow protect the remote login, the security of the system is reduced to the security of the remote login session.

Add a self-signed certificate to the ike.privatekeys database.

# ikecert certlocal -ks|-kc -m keysize -t keytype \
-D dname -A altname \
[-S validity-start-time] [-F validity-end-time] [-T token-ID

-ks: Creates a self-signed certificate.
-kc: Creates a certificate request. For the procedure, see How to Configure IKE With Certificates Signed by a CA.
-m keysize: Is the size of the key. The keysize can be 512, 1024, 2048, 3072, or 4096.
-t keytype: Specifies the type of algorithm to use. The keytype can be rsa-sha1, rsa-md5, or dsa-sha1.
-D dname: Is the X.509 distinguished name for the certificate subject. The dname typically has the form: C=country, O=organization, OU=organizational unit, CN=common name. Valid tags are C, O, OU, and CN.
-A altname: Is the alternate name for the certificate. The altname is in the form of tag=value. Valid tags are IP, DNS, email, and DN.
-S validity-start-time: Provides an absolute or relative valid start time for the certificate.
-F validity-end-time: Provides an absolute or relative valid end time for the certificate.
-T token-ID: Enables a PKCS #11 hardware token to generate the keys. The certificates are then stored in the hardware.

For example, the command on the partym system would appear similar to the following:

# ikecert certlocal -ks -m 1024 -t rsa-md5 \
-D "C=US, O=PartyCompany, OU=US-Partym, CN=Partym" \
-A IP=192.168.13.213
Creating software private keys.
  Writing private key to file /etc/inet/secret/ike.privatekeys/0.
Enabling external key providers - done.
Acquiring private keys for signing - done.
Certificate: 
 Proceeding with the signing operation.
 Certificate generated successfully (…/publickeys/0)
Finished successfully.
Certificate added to database.
-----BEGIN X509 CERTIFICATE-----
MIICLTCCAZagAwIBAgIBATANBgkqhkiG9w0BAQQFADBNMQswCQYDVQQGEwJVUzEX
…
6sKTxpg4GP3GkQGcd0r1rhW/3yaWBkDwOdFCqEUyffzU
-----END X509 CERTIFICATE-----

The command on the enigma system would appear similar to the following:

# ikecert certlocal -ks -m 1024 -t rsa-md5 \
-D "C=JA, O=EnigmaCo, OU=JA-Enigmax, CN=Enigmax" \
-A IP=192.168.116.16
Creating software private keys.
  …
Certificate added to database.
-----BEGIN X509 CERTIFICATE-----
MIICKDCCAZGgAwIBAgIBATANBgkqhkiG9w0BAQQFADBJMQswCQYDVQQGEwJVUzEV
…
jpxfLM98xyFVyLCbkr3dZ3Tvxvi732BXePKF2A==
-----END X509 CERTIFICATE-----

Save the certificate and send it to the remote system.

You can paste the certificate into an email.

For example, you would send the following partym certificate to the enigma administrator:

To: [email protected]
From: [email protected]
Message: -----BEGIN X509 CERTIFICATE-----
MIICLTCCAZagAwIBAgIBATANBgkqhkiG9w0BAQQFADBNMQswCQYDVQQGEwJVUzEX
…
6sKTxpg4GP3GkQGcd0r1rhW/3yaWBkDwOdFCqEUyffzU
-----END X509 CERTIFICATE-----

The enigma administrator would send you the following enigma certificate:

To: [email protected]
From: [email protected]
Message: -----BEGIN X509 CERTIFICATE-----
MIICKDCCAZGgAwIBAgIBATANBgkqhkiG9w0BAQQFADBJMQswCQYDVQQGEwJVUzEV
…
jpxfLM98xyFVyLCbkr3dZ3Tvxvi732BXePKF2A==
-----END X509 CERTIFICATE-----

Verify with the other administrator that the keys have not been tampered with.

For example, you can phone the other administrator to compare the values of the public key hash. The public key hash for the shared certificate should be identical on the two systems.

List the stored certificate on your system.

For example, on the partym system, the public certificate is in slot 1, and the private certificate is in slot 0.

partym # ikecert certdb -l
Certificate Slot Name: 0   Type: rsa-md5 Private Key
    Subject Name: <C=US, O=PartyCompany, OU=US-Partym, CN=Partym>
    Key Size: 1024
    Public key hash: B2BD13FCE95FD27ECE6D2DCD0DE760E2

Certificate Slot Name: 1   Type: rsa-md5 Public Certificate
    (Private key in certlocal slot 0) Points to certificate's private key
    Subject Name: <C=JA, O=EnigmaCo, OU=JA-Enigmax, CN=Enigmax>
    Key Size: 1024
    Public key hash: 2239A6A127F88EE0CB40F7C24A65B818

Compare this value with the public key hash on the enigma system.

You can read the public key hash over the phone.

enigma # ikecert certdb -l
Certificate Slot Name: 4   Type: rsa-md5 Private Key
    Subject Name: <C=JA, O=EnigmaCo, OU=JA-Enigmax, CN=Enigmax>
    Key Size: 1024
    Public key hash: DF3F108F6AC669C88C6BD026B0FCE3A0

Certificate Slot Name: 5   Type: rsa-md5 Public Certificate
    (Private key in certlocal slot 4)
    Subject Name: <C=US, O=PartyCompany, OU=US-Partym, CN=Partym>
    Key Size: 1024
    Public key hash: 2239A6A127F88EE0CB40F7C24A65B818

On each system, trust both certificates.

Edit the /etc/inet/ike/config file to recognize the certificates.

The administrator of the remote system provides the values for the cert_trust, remote_addr, and remote_id parameters.

For example, on the partym system, the ike/config file would appear similar to the following:

# Explicitly trust the following self-signed certs
# Use the Subject Alternate Name to identify the cert

# Verified remote address and remote ID
# Verified public key hash per phone call from administrator
cert_trust "192.168.13.213" Local system's certificate Subject Alt Name
cert_trust "192.168.116.16" Remote system's certificate Subject Alt Name

## Parameters that may also show up in rules.

p1_xform 
  { auth_method preshared oakley_group 5 auth_alg sha encr_alg des }
p2_pfs 5

{
 label "US-partym to JA-enigmax"
 local_id_type dn
 local_id "C=US, O=PartyCompany, OU=US-Partym, CN=Partym"
 remote_id "C=JA, O=EnigmaCo, OU=JA-Enigmax, CN=Enigmax"

 local_addr  192.168.13.213
 remote_addr 192.168.116.16

 p1_xform
  {auth_method rsa_sig oakley_group 2 auth_alg md5 encr_alg 3des}
}

On the enigma system, add enigma values for local parameters in the ike/config file.
For the remote parameters, use partym values. Ensure that the value for the label keyword is unique. This value must be different from the remote system's label value.
```
…
{
 label "JA-enigmax to US-partym"
 local_id_type dn
 local_id "C=JA, O=EnigmaCo, OU=JA-Enigmax, CN=Enigmax"
 remote_id "C=US, O=PartyCompany, OU=US-Partym, CN=Partym"

 local_addr  192.168.116.16
 remote_addr 192.168.13.213
…
```

On each system, add the certificate that you received.
1. Copy the public key from the administrator's email.
2. Type the ikecert certdb -a command and press the Return key.
  No prompts display when you press the Return key.
```
# ikecert certdb -a Press the Return key
```
3. Paste the public key. Then press the Return key. To end the entry, press Control-D.
```
-----BEGIN X509 CERTIFICATE----- MIIC… … ----END X509 CERTIFICATE----- Press the Return key
<Control>-D
```

Example 23-2 Giving a Start Time and an End Time to a Certificate

The administrator on the machine partym establishes dates within which the certificate is valid. The certificate is backdated by 2 1/2 days, and is valid for 4 years and 6 months from the date of creation.

# ikecert certlocal -ks -m 1024 -t rsa-md5 \
-D "C=US, O=PartyCompany, OU=US-Partym, CN=Partym" \
-A IP=192.168.13.213 \
-S -2d12h -F +4y6m

The administrator on the machine enigma establishes dates within which the certificate is valid. The certificate is backdated by 2 days, and is valid until midnight of December 31, 2010.

# ikecert certlocal -ks -m 1024 -t rsa-md5 \
-D "C=JA, O=EnigmaCo, OU=JA-Enigmax, CN=Enigmax" \
-A IP=192.168.116.16 \
-S -2d -F "12/31/2010 12:00 AM"

How to Configure IKE With Certificates Signed by a CA

Public certificates from a Certificate Authority (CA) require negotiation with an outside organization. The certificates very easily scale to protect a large number of communicating systems.

On the system console, assume the Primary Administrator role or become superuser.
The Primary Administrator role includes the Primary Administrator profile. To create the role and assign the role to a user, see Chapter 2, Working With the Solaris Management Console (Tasks), in System Administration Guide: Basic Administration.

Note - Logging in remotely exposes security-critical traffic to eavesdropping. Even if you somehow protect the remote login, the security of the system is reduced to the security of the remote login session.

Use the ikecert certlocal -kc command to create a certificate request.

For a description of the arguments to the command, see Step 2 in How to Configure IKE With Self-Signed Public Key Certificates.

# ikecert certlocal -kc -m keysize -t keytype \
-D dname -A altname

For example, the following command creates a certificate request on the partym system:

# ikecert certlocal -kc -m 1024 -t rsa-md5 \
> -D "C=US, O=PartyCompany\, Inc., OU=US-Partym, CN=Partym" \
> -A "DN=C=US, O=PartyCompany\, Inc., OU=US-Partym"
Creating software private keys.
  Writing private key to file /etc/inet/secret/ike.privatekeys/2.
Enabling external key providers - done.
Certificate Request: 
  Proceeding with the signing operation.
  Certificate request generated successfully (…/publickeys/0)
Finished successfully.
-----BEGIN CERTIFICATE REQUEST-----
MIIByjCCATMCAQAwUzELMAkGA1UEBhMCVVMxHTAbBgNVBAoTFEV4YW1wbGVDb21w
…
lcM+tw0ThRrfuJX9t/Qa1R/KxRlMA3zckO80mO9X
-----END CERTIFICATE REQUEST-----

The following command creates a certificate request on the enigma system:

# ikecert certlocal -kc -m 1024 -t rsa-md5 \
> -D "C=JA, O=EnigmaCo\, Inc., OU=JA-Enigmax, CN=Enigmax" \
> -A "DN=C=JA, O=EnigmaCo\, Inc., OU=JA-Enigmax"
Creating software private keys.
…
Finished successfully.
-----BEGIN CERTIFICATE REQUEST-----
MIIBuDCCASECAQAwSTELMAkGA1UEBhMCVVMxFTATBgNVBAoTDFBhcnR5Q29tcGFu
…
8qlqdjaStLGfhDOO
-----END CERTIFICATE REQUEST-----

Submit the certificate request to a PKI organization.
The PKI organization can tell you how to submit the certificate request. Most organizations have a web site with a submission form. The form requires proof that the submission is legitimate. Typically, you paste your certificate request into the form. When your request has been checked by the organization, the organization issues you the following two certificate objects and a list of revoked certificates:
- Your public key certificate – This certificate is based on the request that you submitted to the organization. The request that you submitted is part of this public key certificate. The certificate uniquely identifies you.
- A Certificate Authority – The organization's signature. The CA verifies that your public key certificate is legitimate.
- A Certificate Revocation List (CRL) – The latest list of certificates that the organization has revoked. The CRL is not sent separately as a certificate object if access to the CRL is embedded in the public key certificate.
  When a URI for the CRL is embedded in the public key certificate, IKE can automatically retrieve the CRL for you. Similarly, when a DN (directory name on an LDAP server) entry is embedded in the public key certificate, IKE can retrieve and cache the CRL from an LDAP server that you specify.
  See How to Handle a Certificate Revocation List for an example of an embedded URI and an embedded DN entry in a public key certificate.
Add each certificate to your system.
The -a option to the ikecert certdb -a adds the pasted object to the appropriate certificate database on your system. For more information, see IKE With Public Key Certificates.
1. On the system console, assume the Primary Administrator role or become superuser.
2. Add the public key certificate that you received from the PKI organization.
```
# ikecert certdb -a
Press the Return key
Paste the certificate:
-----BEGIN X509 CERTIFICATE----- … -----END X509 CERTIFICATE----
Press the Return key
<Control>-D
```
3. Add the CA from the PKI organization.
```
# ikecert certdb -a
Press the Return key
Paste the CA:
-----BEGIN X509 CERTIFICATE----- … -----END X509 CERTIFICATE----
Press the Return key
<Control>-D
```
4. If the PKI organization has sent a list of revoked certificates, add the CRL to the certrldb database:
```
# ikecert certrldb -a
Press the Return key
Paste the CRL:
-----BEGIN CRL----- … -----END CRL----
Press the Return key
<Control>-D
```

Use the cert_root keyword to identify the PKI organization in the /etc/inet/ike/config file.

Use the name that the PKI organization provides.

For example, the ike/config file on the partym system might appear similar to the following:

# Trusted root cert
# This certificate is from Example PKI
# This is the X.509 distinguished name for the CA that it issues.

cert_root "C=US, O=ExamplePKI\, Inc., OU=PKI-Example, CN=Example PKI"

## Parameters that may also show up in rules.

p1_xform 
 { auth_method rsa_sig oakley_group 1 auth_alg sha1 encr_alg des }
p2_pfs 2

{
 label "US-partym to JA-enigmax - Example PKI"
 local_id_type dn
 local_id  "C=US, O=PartyCompany, OU=US-Partym, CN=Partym"
 remote_id "C=JA, O=EnigmaCo, OU=JA-Enigmax, CN=Enigmax"

 local_addr  192.168.13.213
 remote_addr 192.168.116.16

 p1_xform
  {auth_method rsa_sig oakley_group 2 auth_alg md5 encr_alg 3des}
}

Note - All arguments to the auth_method parameter must be on the same line.

On the enigma system, create a similar file.

Specifically, the enigma ike/config file should do the following:

Include the same cert_root value.
Use enigma values for local parameters.
Use partym values for remote parameters.
Create a unique value for the label keyword. This value must be different from the remote system's label value.

…
cert_root "C=US, O=ExamplePKI\, Inc., OU=PKI-Example, CN=Example PKI"
…
{
 label "JA-enigmax to US-partym - Example PKI"
 local_id_type dn
 local_id   "C=JA, O=EnigmaCo, OU=JA-Enigmax, CN=Enigmax"
 remote_id  "C=US, O=PartyCompany, OU=US-Partym, CN=Partym"
 
 local_addr  192.168.116.16
 remote_addr 192.168.13.213
…

Tell IKE how to handle CRLs.
Choose the appropriate option:
- No CRL available
  If the PKI organization does not provide a CRL, add the keyword ignore_crls to the ike/config file.
```
# Trusted root cert
…
cert_root "C=US, O=ExamplePKI\, Inc., OU=PKI-Example,…
ignore_crls
…
```
  The ignore_crls keyword tells IKE not to search for CRLs.
- CRL available
  If the PKI organization provides a central distribution point for CRLs, you can modify the ike/config file to point to that location.
  See How to Handle a Certificate Revocation List for examples.

Example 23-3 Using rsa_encrypt When Configuring IKE

When you use auth_method rsa_encrypt in the ike/config file, you must add the peer's certificate to the publickeys database.

Send the certificate to the remote system's administrator.

You can paste the certificate into an email.

For example, the partym administrator would send the following email:

To: [email protected]
From: [email protected]
Message: -----BEGIN X509 CERTIFICATE-----
MII…
----END X509 CERTIFICATE-----

The enigma administrator would send the following email:

To: [email protected]
From: [email protected]
Message: -----BEGIN X509 CERTIFICATE-----
MII
…
-----END X509 CERTIFICATE-----

On each system, add the emailed certificate to the local publickeys database.

# ikecert certdb -a
Press the Return key
-----BEGIN X509 CERTIFICATE----- MII… -----END X509 CERTIFICATE-----
Press the Return key
<Control>-D

The authentication method for RSA encryption hides identities in IKE from eavesdroppers. Because the rsa_encrypt method hides the peer's identity, IKE cannot retrieve the peer's certificate. As a result, the rsa_encrypt method requires that the IKE peers know each other's public keys.

Therefore, when you use an auth_method of rsa_encrypt in the /etc/inet/ike/config file, you must add the peer's certificate to the publickeys database. The publickeys database then holds three certificates for each communicating pair of systems:

Your public key certificate
The CA certificate
The peer's public key certificate

Troubleshooting – The IKE payload, which includes the three certificates, can become too large for rsa_encrypt to encrypt. Errors such as “authorization failed” and “malformed payload” can indicate that the rsa_encrypt method cannot encrypt the total payload. Reduce the size of the payload by using a method, such as rsa_sig, that requires only two certificates.

How to Generate and Store Public Key Certificates on Hardware

Generating and storing public key certificates on hardware is similar to generating and storing public key certificates on your system. On hardware, the ikecert certlocal and ikecert certdb commands must identify the hardware. The -T option with the token ID identifies the hardware to the commands.

Before You Begin

The hardware must be configured.
The hardware uses the /usr/lib/libpkcs11.so library unless the pkcs11_path keyword in the /etc/inet/ike/config file points to a different library. The library must be implemented according to the following standard: RSA Security Inc. PKCS #11 Cryptographic Token Interface (Cryptoki), that is, a PKCS #11 library.
See How to Configure IKE to Find the Sun Crypto Accelerator 4000 Board for setup instructions.

On the system console, assume the Primary Administrator role or become superuser.
The Primary Administrator role includes the Primary Administrator profile. To create the role and assign the role to a user, see Chapter 2, Working With the Solaris Management Console (Tasks), in System Administration Guide: Basic Administration.

Note - Logging in remotely exposes security-critical traffic to eavesdropping. Even if you somehow protect the remote login, the security of the system is reduced to the security of the remote login session.
Generate a self-signed certificate or a certificate request, and specify the token ID.
Choose one of the following options:

Note - The Sun Crypto Accelerator 4000 board supports keys up to 2048 bits for RSA. For DSA, this board supports keys up to 1024 bits.
- For a self-signed certificate, use this syntax.
```
# ikecert certlocal -ks -m 1024 -t rsa-md5 \
> -D "C=US, O=PartyCompany, OU=US-Partym, CN=Partym" \
> -a -T dca0-accel-stor IP=192.168.116.16
Creating hardware private keys.
Enter PIN for PKCS#11 token: Type user:password
```
  The argument to the -T option is the token ID from the attached Sun Crypto Accelerator 4000 board.
- For a certificate request, use this syntax.
```
# ikecert certlocal -kc -m 1024 -t rsa-md5 \
> -D "C=US, O=PartyCompany, OU=US-Partym, CN=Partym" \
> -a -T dca0-accel-stor IP=192.168.116.16
Creating hardware private keys.
Enter PIN for PKCS#11 token: Type user:password
```
For a description of the arguments to the ikecert command, see the ikecert(1M) man page.
At the prompt for a PIN, type the Sun Crypto Accelerator 4000 user, a colon, and the user's password.
If the Sun Crypto Accelerator 4000 board has a user ikemgr whose password is rgm4tigt, you would type the following:
```
Enter PIN for PKCS#11 token: ikemgr:rgm4tigt
```
Note - The PIN response is stored on disk as clear text.

After you type the password, the certificate prints out:
```
Enter PIN for PKCS#11 token: ikemgr:rgm4tigt
-----BEGIN X509 CERTIFICATE-----
MIIBuDCCASECAQAwSTELMAkGA1UEBhMCVVMxFTATBgNVBAoTDFBhcnR5Q29tcGFu
…
oKUDBbZ9O/pLWYGr
-----END X509 CERTIFICATE-----
```
Send your certificate for use by the other party.
Choose one of the following options:
- Send the self-signed certificate to the remote system.
  You can paste the certificate into an email.
- Send the certificate request to an organization that handles PKI.
  Follow the instructions of the PKI organization to submit the certificate request. For a more detailed discussion, see Step 3 of How to Configure IKE With Certificates Signed by a CA.

On your system, edit the /etc/inet/ike/config file to recognize the certificates.

Choose one of the following options.

Self-signed certificate

Use the values that the administrator of the remote system provides for the cert_trust, remote_id, and remote_addr parameters. For example, on the enigma system, the ike/config file would appear similar to the following:

# Explicitly trust the following self-signed certs
# Use the Subject Alternate Name to identify the cert

cert_trust "192.168.116.16"  Local system's certificate Subject Alt Name
cert_trust "192.168.13.213"  Remote system's certificate Subject Alt name


# Solaris 10 1/06 release: default path does not have to be typed in
#pkcs11_path "/usr/lib/libpkcs11.so" Hardware connection

# Solaris 10 release: use this path
#pkcs11_path "/opt/SUNWconn/cryptov2/lib/libvpkcs11.so"
…
{
 label "JA-enigmax to US-partym"
 local_id_type dn
 local_id "C=JA, O=EnigmaCo, OU=JA-Enigmax, CN=Enigmax"
 remote_id "C=US, O=PartyCompany, OU=US-Partym, CN=Partym"

 local_addr  192.168.116.16
 remote_addr 192.168.13.213

 p1_xform
  {auth_method rsa_sig oakley_group 2 auth_alg md5 encr_alg 3des}
}

Certificate request

Type the name that the PKI organization provides as the value for the cert_root keyword. For example, the ike/config file on the enigma system might appear similar to the following:

# Trusted root cert
# This certificate is from Example PKI
# This is the X.509 distinguished name for the CA that it issues.

cert_root "C=US, O=ExamplePKI\, Inc., OU=PKI-Example, CN=Example PKI"

# Solaris 10 1/06 release: default path does not have to be typed in
#pkcs11_path "/usr/lib/libpkcs11.so" Hardware connection

# Solaris 10 release: use this path
#pkcs11_path "/opt/SUNWconn/cryptov2/lib/libvpkcs11.so"
…
{
 label "JA-enigmax to US-partym - Example PKI"
 local_id_type dn
 local_id "C=JA, O=EnigmaCo, OU=JA-Enigmax, CN=Enigmax"
 remote_id  "C=US, O=PartyCompany, OU=US-Partym, CN=Partym"

 local_addr  192.168.116.16
 remote_addr 192.168.13.213

 p1_xform
  {auth_method rsa_sig oakley_group 2 auth_alg md5 encr_alg 3des}
}

Place the certificates from the other party in the hardware.
Respond to the PIN request as you responded in Step 3.

Note - You must add the public key certificates to the same attached hardware that generated your private key.
- Self-signed certificate.
  Add the remote system's self-signed certificate. In this example, the certificate is stored in the file, DCA.ACCEL.STOR.CERT.
```
# ikecert certdb -a -T dca0-accel-stor < DCA.ACCEL.STOR.CERT
Enter PIN for PKCS#11 token: Type user:password
```
  If the self-signed certificate used rsa_encrypt as the value for the auth_method parameter, add the peer's certificate to the hardware store.
- Certificates from a PKI organization.
  Add the certificate that the organization generated from your certificate request, and add the certificate authority (CA).
```
# ikecert certdb -a -T dca0-accel-stor < DCA.ACCEL.STOR.CERT
Enter PIN for PKCS#11 token: Type user:password
```
```
# ikecert certdb -a -T dca0-accel-stor < DCA.ACCEL.STOR.CA.CERT
Enter PIN for PKCS#11 token: Type user:password
```
  To add a certificate revocation list (CRL) from the PKI organization, see How to Handle a Certificate Revocation List.

How to Handle a Certificate Revocation List

A certificate revocation list (CRL) contains outdated or compromised certificates from a Certificate Authority. You have four ways to handle CRLs.

You must instruct IKE to ignore CRLs if your CA organization does not issue CRLs. This option is shown in Step 6 in How to Configure IKE With Certificates Signed by a CA.
You can instruct IKE to access the CRLs from a URI (uniform resource indicator) whose address is embedded in the public key certificate from the CA.
You can instruct IKE to access the CRLs from an LDAP server whose DN (directory name) entry is embedded in the public key certificate from the CA.
You can provide the CRL as an argument to the ikecert certrldb command. For an example, see Example 23-4.

The following procedure describes how to instruct IKE to use CRLs from a central distribution point.

Display the certificate that you received from the CA.

# ikecert certdb -lv certspec

-l: Lists certificates in the IKE certificate database.
-v: Lists the certificates in verbose mode. Use this option with care.
certspec: Is a pattern that matches a certificate in the IKE certificate database.

For example, the following certificate was issued by Sun Microsystems. Details have been altered.

# ikecert certdb -lv example-protect.sun.com
Certificate Slot Name: 0   Type: dsa-sha1
   (Private key in certlocal slot 0)
 Subject Name: <O=Sun Microsystems Inc, CN=example-protect.sun.com>
 Issuer Name: <CN=Sun Microsystems Inc CA (Cl B), O=Sun Microsystems Inc>
 SerialNumber: 14000D93
   Validity:
      Not Valid Before: 2002 Jul 19th, 21:11:11 GMT
      Not Valid After:  2005 Jul 18th, 21:11:11 GMT
   Public Key Info:
      Public Modulus  (n) (2048 bits): C575A…A5
      Public Exponent (e) (  24 bits): 010001
   Extensions:
      Subject Alternative Names:
              DNS = example-protect.sun.com
      Key Usage: DigitalSignature KeyEncipherment
      [CRITICAL]
   CRL Distribution Points:
      Full Name:
         URI = #Ihttps://www.sun.com/pki/pkismica.crl#i
         DN = <CN=Sun Microsystems Inc CA (Cl B), O=Sun Microsystems Inc>
      CRL Issuer: 
      Authority Key ID:
      Key ID:              4F … 6B
      SubjectKeyID:        A5 … FD
      Certificate Policies
      Authority Information Access

Notice the CRL Distribution Points entry. The URI entry indicates that this organization's CRL is available on the web. The DN entry indicates that the CRL is available on an LDAP server. Once accessed by IKE, the CRL is cached for further use.

To access the CRL, you need to reach a distribution point.

Choose one of the following methods to access the CRL from a central distribution point.
- Use the URI.
  Add the keyword use_http to the host's /etc/inet/ike/config file. For example, the ike/config file would appear similar to the following:
```
# Use CRL from organization's URI
use_http
…
```
- Use a web proxy.
  Add the keyword proxy to the ike/config file. The proxy keyword takes a URL as an argument, as in the following:
```
# Use own web proxy
proxy "https://proxy1:8080"
```
- Use an LDAP server.
  Name the LDAP server as an argument to the ldap-list keyword in the host's /etc/inet/ike/config file. Your organization provides the name of the LDAP server. The entry in the ike/config file would appear similar to the following:
```
# Use CRL from organization's LDAP
ldap-list "ldap1.sun.com:389,ldap2.sun.com"
…
```
IKE retrieves the CRL and caches the CRL until the certificate expires.

Example 23-4 Pasting a CRL Into the Local certrldb Database

If the PKI organization's CRL is not available from a central distribution point, you can add the CRL manually to the local certrldb database. Follow the PKI organization's instructions for extracting the CRL into a file, then add the CRL to the database with the ikecert certrldb -a command.

# ikecert certrldb -a < Sun.Cert.CRL