Instance Identity Documents
An instance identity document is a JSON file that describes an instance. The instance identity document is accompanied by a signature and a PKCS7 signature which can be used to verify the accuracy, origin, and authenticity of the information provided in the document. For example, you may have downloaded free software with paid updates.
The instance identity document is generated when the instance is launched, and exposed to the instance through instance metadata. It validates the attributes of the instances, such as the subscribed software, instance size, instance type, operating system, and AMI.
Important
Due to the dynamic nature of instance identity documents and signatures, we recommend retrieving the instance identity document and signature regularly.
Obtaining the Instance Identity Document and Signatures
To retrieve the instance identity document, use the following command from your running instance:
Copy[ec2-user ~]$curl http://169.254.169.254/latest/dynamic/instance-identity/document
The following is example output:
{
"devpayProductCodes" : null,
"availabilityZone" : "us-west-2b",
"privateIp" : "10.158.112.84",
"version" : "2010-08-31",
"instanceId" : "i-1234567890abcdef0",
"billingProducts" : null,
"instanceType" : "t2.micro",
"accountId" : "123456789012",
"imageId" : "ami-5fb8c835",
"pendingTime" : "2016-11-19T16:32:11Z",
"architecture" : "x86_64",
"kernelId" : null,
"ramdiskId" : null,
"region" : "us-west-2"
}
To retrieve the instance identity signature, use the following command from your running instance:
Copy[ec2-user ~]$curl http://169.254.169.254/latest/dynamic/instance-identity/signature
The following is example output:
dExamplesjNQhhJan7pORLpLSr7lJEF4V2DhKGlyoYVBoUYrY9njyBCmhEayaGrhtS/AWY+LPx lVSQURF5n0gwPNCuO6ICT0fNrm5IH7w9ydyaexamplejJw8XvWPxbuRkcN0TAA1p4RtCAqm4ms x2oALjWSCBExample=
To retrieve the PKCS7 signature, use the following command from your running instance:
Copy[ec2-user ~]$curl http://169.254.169.254/latest/dynamic/instance-identity/pkcs7
The following is example output:
MIICiTCCAfICCQD6m7oRw0uXOjANBgkqhkiG9w0BAQUFADCBiDELMAkGA1UEBhMC VVMxCzAJBgNVBAgTAldBMRAwDgYDVQQHEwdTZWF0dGxlMQ8wDQYDVQQKEwZBbWF6 b24xFDASBgNVBAsTC0lBTSBDb25zb2xlMRIwEAYDVQQDEwlUZXN0Q2lsYWMxHzAd BgkqhkiG9w0BCQEWEG5vb25lQGFtYXpvbi5jb20wHhcNMTEwNDI1MjA0NTIxWhcN MTIwNDI0MjA0NTIxWjCBiDELMAkGA1UEBhMCVVMxCzAJBgNVBAgTAldBMRAwDgYD VQQHEwdTZWF0dGxlMQ8wDQYDVQQKEwZBbWF6b24xFDASBgNVBAsTC0lBTSBDb25z b2xlMRIwEAYDVQQDEwlUZXN0Q2lsYWMxHzAdBgkqhkiG9w0BCQEWEG5vb25lQGFt YXpvbi5jb20wgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAMaK0dn+a4GmWIWJ 21uUSfwfEvySWtC2XADZ4nB+BLYgVIk60CpiwsZ3G93vUEIO3IyNoH/f0wYK8m9T rDHudUZg3qX4waLG5M43q7Wgc/MbQITxOUSQv7c7ugFFDzQGBzZswY6786m86gpE Ibb3OhjZnzcvQAaRHhdlQWIMm2nrAgMBAAEwDQYJKoZIhvcNAQEFBQADgYEAtCu4 nUhVVxYUntneD9+h8Mg9q6q+auNKyExzyLwaxlAoo7TJHidbtS4J5iNmZgXL0Fkb FFBjvSfpJIlJ00zbhNYS5f6GuoEDmFJl0ZxBHjJnyp378OD8uTs7fLvjx79LjSTb NYiytVbZPQUQ5Yaxu2jXnimvw3rrszlaEXAMPLE
Verifying the PKCS7 Signature
You can use the PKCS7 signature to verify your instance by validating it against the appropriate AWS public certificate.
The AWS public certificate for the regions provided by an AWS account is as follows:
Copy-----BEGIN CERTIFICATE----- MIIC7TCCAq0CCQCWukjZ5V4aZzAJBgcqhkjOOAQDMFwxCzAJBgNVBAYTAlVTMRkw FwYDVQQIExBXYXNoaW5ndG9uIFN0YXRlMRAwDgYDVQQHEwdTZWF0dGxlMSAwHgYD VQQKExdBbWF6b24gV2ViIFNlcnZpY2VzIExMQzAeFw0xMjAxMDUxMjU2MTJaFw0z ODAxMDUxMjU2MTJaMFwxCzAJBgNVBAYTAlVTMRkwFwYDVQQIExBXYXNoaW5ndG9u IFN0YXRlMRAwDgYDVQQHEwdTZWF0dGxlMSAwHgYDVQQKExdBbWF6b24gV2ViIFNl cnZpY2VzIExMQzCCAbcwggEsBgcqhkjOOAQBMIIBHwKBgQCjkvcS2bb1VQ4yt/5e ih5OO6kK/n1Lzllr7D8ZwtQP8fOEpp5E2ng+D6Ud1Z1gYipr58Kj3nssSNpI6bX3 VyIQzK7wLclnd/YozqNNmgIyZecN7EglK9ITHJLP+x8FtUpt3QbyYXJdmVMegN6P hviYt5JH/nYl4hh3Pa1HJdskgQIVALVJ3ER11+Ko4tP6nwvHwh6+ERYRAoGBAI1j k+tkqMVHuAFcvAGKocTgsjJem6/5qomzJuKDmbJNu9Qxw3rAotXau8Qe+MBcJl/U hhy1KHVpCGl9fueQ2s6IL0CaO/buycU1CiYQk40KNHCcHfNiZbdlx1E9rpUp7bnF lRa2v1ntMX3caRVDdbtPEWmdxSCYsYFDk4mZrOLBA4GEAAKBgEbmeve5f8LIE/Gf MNmP9CM5eovQOGx5ho8WqD+aTebs+k2tn92BBPqeZqpWRa5P/+jrdKml1qx4llHW MXrs3IgIb6+hUIB+S8dz8/mmO0bpr76RoZVCXYab2CZedFut7qc3WUH9+EUAH5mw vSeDCOUMYQR7R9LINYwouHIziqQYMAkGByqGSM44BAMDLwAwLAIUWXBlk40xTwSw 7HX32MxXYruse9ACFBNGmdX2ZBrVNGrN9N2f6ROk0k9K -----END CERTIFICATE-----
The AWS public certificate for the AWS GovCloud (US) region is as follows:
Copy-----BEGIN CERTIFICATE----- MIIC7TCCAq0CCQCWukjZ5V4aZzAJBgcqhkjOOAQDMFwxCzAJBgNVBAYTAlVTMRkw FwYDVQQIExBXYXNoaW5ndG9uIFN0YXRlMRAwDgYDVQQHEwdTZWF0dGxlMSAwHgYD VQQKExdBbWF6b24gV2ViIFNlcnZpY2VzIExMQzAeFw0xMjAxMDUxMjU2MTJaFw0z ODAxMDUxMjU2MTJaMFwxCzAJBgNVBAYTAlVTMRkwFwYDVQQIExBXYXNoaW5ndG9u IFN0YXRlMRAwDgYDVQQHEwdTZWF0dGxlMSAwHgYDVQQKExdBbWF6b24gV2ViIFNl cnZpY2VzIExMQzCCAbcwggEsBgcqhkjOOAQBMIIBHwKBgQCjkvcS2bb1VQ4yt/5e ih5OO6kK/n1Lzllr7D8ZwtQP8fOEpp5E2ng+D6Ud1Z1gYipr58Kj3nssSNpI6bX3 VyIQzK7wLclnd/YozqNNmgIyZecN7EglK9ITHJLP+x8FtUpt3QbyYXJdmVMegN6P hviYt5JH/nYl4hh3Pa1HJdskgQIVALVJ3ER11+Ko4tP6nwvHwh6+ERYRAoGBAI1j k+tkqMVHuAFcvAGKocTgsjJem6/5qomzJuKDmbJNu9Qxw3rAotXau8Qe+MBcJl/U hhy1KHVpCGl9fueQ2s6IL0CaO/buycU1CiYQk40KNHCcHfNiZbdlx1E9rpUp7bnF lRa2v1ntMX3caRVDdbtPEWmdxSCYsYFDk4mZrOLBA4GEAAKBgEbmeve5f8LIE/Gf MNmP9CM5eovQOGx5ho8WqD+aTebs+k2tn92BBPqeZqpWRa5P/+jrdKml1qx4llHW MXrs3IgIb6+hUIB+S8dz8/mmO0bpr76RoZVCXYab2CZedFut7qc3WUH9+EUAH5mw vSeDCOUMYQR7R9LINYwouHIziqQYMAkGByqGSM44BAMDLwAwLAIUWXBlk40xTwSw 7HX32MxXYruse9ACFBNGmdX2ZBrVNGrN9N2f6ROk0k9K -----END CERTIFICATE-----
For other regions, contact AWS Support to get the AWS public certificate.
To verify the PKCS7 signature
-
From your instance, create a temporary file for the PKCS7 signature:
Copy[ec2-user ~]$PKCS7=$(mktemp) -
Add the
-----BEGIN PKCS7-----header to the temporary PKCS7 file:Copy[ec2-user ~]$echo "-----BEGIN PKCS7-----" > $PKCS7 -
Append the contents of the PKCS7 signature from the instance metadata, plus a new line:
Copy[ec2-user ~]$curl -s http://169.254.169.254/latest/dynamic/instance-identity/pkcs7 >> $PKCS7[ec2-user ~]$echo "" >> $PKCS7 -
Append the
-----END PKCS7-----footer:Copy[ec2-user ~]$echo "-----END PKCS7-----" >> $PKCS7 -
Create a temporary file for the instance identity document:
Copy[ec2-user ~]$DOCUMENT=$(mktemp) -
Add the contents of the document from your instance metadata to the temporary document file:
Copy[ec2-user ~]$curl -s http://169.254.169.254/latest/dynamic/instance-identity/document > $DOCUMENT -
Open a text editor and create a file named
AWSpubkey. Copy and paste the contents of the AWS public certificate above to the file and save it. -
Use the OpenSSL tools to verify the signature as follows:
Copy[ec2-user ~]$openssl smime -verify -in $PKCS7 -inform PEM -content $DOCUMENT -certfile AWSpubkey -noverify > /dev/nullVerification successful
