Fetch

The fetch subcommand is designed to visualize X509 Certificates by making ad-hoc query on remote sources (jwk, saml, tcp, tls).

cert-monitor fetch

fetch certificate from remote sources

Usage:
  cert-monitor fetch [flags]
  cert-monitor fetch [command]

Available Commands:
  jwk         fetch certificates from remote JWKs endpoint
  saml        fetch certificates from remote SAML metadata
  tcp         fetch certificates from remote tcp endpoint
  tls         fetch certificates from remote TLS url

Flags:
  -h, --help                  help for fetch
  -i, --index int             Index from certificate list (default -1)
      --no-color              Disable color output
      --no-text               Don't display test (only PEM)
      --skew int              Days to check for expiration (default 90)
      --skip-tls-validation   Skip TLS certificate validation

Global Flags:
  -d, --debug   debug mode enabled

Use "cert-monitor fetch [command] --help" for more information about a command.

Common Options

--no-color

Disable colored output.

--index int

Remote sources can host multiple certificates (e.g. CAchain + server certificate). The --index (or -i) can be used to only display the certificate at the specified index in the list of remote certificates.

Note

Index starts at Zero.

Example with HTTPS endpoint:

• Omitting --index display all certificates from the Remote source (in this example 2 certificates are found)

cert-monitor fetch tls --url https://badssl.com

2022-01-16T15:30:42.359+0100 [INFO]  cert-monitor: X509 Certificate: index=0 Subject="CN=*.badssl.com,O=Lucas Garron Torres,L=Walnut Creek,ST=California,C=US"
2022-01-16T15:30:42.359+0100 [INFO]  cert-monitor: X509 Certificate: index=0 Issuer="CN=DigiCert SHA2 Secure Server CA,O=DigiCert Inc,C=US"
2022-01-16T15:30:42.359+0100 [INFO]  cert-monitor: X509 Certificate: index=0 NotBefore="2020-03-23 00:00:00 +0000 UTC"
2022-01-16T15:30:42.359+0100 [INFO]  cert-monitor: X509 Certificate: index=0 NotAfter="2022-05-17 12:00:00 +0000 UTC"
2022-01-16T15:30:42.359+0100 [INFO]  cert-monitor: X509 Certificate: index=0
-----BEGIN CERTIFICATE-----
MIIGqDCCBZCgAwIBAgIQCvBs2jemC2QTQvCh6x1Z/TANBgkqhkiG9w0BAQsFADBN
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMScwJQYDVQQDEx5E
aWdpQ2VydCBTSEEyIFNlY3VyZSBTZXJ2ZXIgQ0EwHhcNMjAwMzIzMDAwMDAwWhcN
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CC01zojqS10nGowxzOiqyB4m6wytmzf0QwjpMw==
-----END CERTIFICATE-----
2022-01-16T15:30:42.360+0100 [INFO]  cert-monitor: X509 Certificate: index=1 Subject="CN=DigiCert SHA2 Secure Server CA,O=DigiCert Inc,C=US"
2022-01-16T15:30:42.360+0100 [INFO]  cert-monitor: X509 Certificate: index=1 Issuer="CN=DigiCert Global Root CA,OU=www.digicert.com,O=DigiCert Inc,C=US"
2022-01-16T15:30:42.360+0100 [INFO]  cert-monitor: X509 Certificate: index=1 NotBefore="2013-03-08 12:00:00 +0000 UTC"
2022-01-16T15:30:42.360+0100 [INFO]  cert-monitor: X509 Certificate: index=1 NotAfter="2023-03-08 12:00:00 +0000 UTC"
2022-01-16T15:30:42.360+0100 [INFO]  cert-monitor: X509 Certificate: index=1
-----BEGIN CERTIFICATE-----
MIIElDCCA3ygAwIBAgIQAf2j627KdciIQ4tyS8+8kTANBgkqhkiG9w0BAQsFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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j6tJLp07kzQoH3jOlOrHvdPJbRzeXDLz
-----END CERTIFICATE-----

• Use --index 1 to only display the second certificate

cert-monitor fetch tls --url https://badssl.com --index 1

2022-01-16T15:34:53.294+0100 [INFO]  cert-monitor: X509 Certificate: index=1 Subject="CN=DigiCert SHA2 Secure Server CA,O=DigiCert Inc,C=US"
2022-01-16T15:34:53.295+0100 [INFO]  cert-monitor: X509 Certificate: index=1 Issuer="CN=DigiCert Global Root CA,OU=www.digicert.com,O=DigiCert Inc,C=US"
2022-01-16T15:34:53.295+0100 [INFO]  cert-monitor: X509 Certificate: index=1 NotBefore="2013-03-08 12:00:00 +0000 UTC"
2022-01-16T15:34:53.295+0100 [INFO]  cert-monitor: X509 Certificate: index=1 NotAfter="2023-03-08 12:00:00 +0000 UTC"
2022-01-16T15:34:53.295+0100 [INFO]  cert-monitor: X509 Certificate: index=1
-----BEGIN CERTIFICATE-----
MIIElDCCA3ygAwIBAgIQAf2j627KdciIQ4tyS8+8kTANBgkqhkiG9w0BAQsFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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j6tJLp07kzQoH3jOlOrHvdPJbRzeXDLz
-----END CERTIFICATE-----

--skew int

A warning message will be displayed if a given X509 Certificates is expired or will expire with the next skew number of days. By default the skew is set to 90 days, but you can override this using --skew flag.

For example:

• with default skew (90 days):

cert-monitor fetch tls --url https://google.com --index 2

2022-01-16T15:44:38.801+0100 [INFO]  cert-monitor: X509 Certificate: index=2 Subject="CN=GTS Root R1,O=Google Trust Services LLC,C=US"
2022-01-16T15:44:38.801+0100 [INFO]  cert-monitor: X509 Certificate: index=2 Issuer="CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE"
2022-01-16T15:44:38.801+0100 [INFO]  cert-monitor: X509 Certificate: index=2 NotBefore="2020-06-19 00:00:42 +0000 UTC"
2022-01-16T15:44:38.801+0100 [INFO]  cert-monitor: X509 Certificate: index=2 NotAfter="2028-01-28 00:00:42 +0000 UTC"
2022-01-16T15:44:38.801+0100 [INFO]  cert-monitor: X509 Certificate: index=2
-----BEGIN CERTIFICATE-----
MIIFYjCCBEqgAwIBAgIQd70NbNs2+RrqIQ/E8FjTDTANBgkqhkiG9w0BAQsFADBX
MQswCQYDVQQGEwJCRTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEQMA4GA1UE
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d0lIKO2d1xozclOzgjXPYovJJIultzkMu34qQb9Sz/yilrbCgj8=
-----END CERTIFICATE-----

• with a --skew 10000 (10 000 days):

cert-monitor fetch tls --url https://google.com --index 2 --skew 10000

2022-01-16T15:45:41.801+0100 [INFO]  cert-monitor: X509 Certificate: index=2 Subject="CN=GTS Root R1,O=Google Trust Services LLC,C=US"
2022-01-16T15:45:41.802+0100 [INFO]  cert-monitor: X509 Certificate: index=2 Issuer="CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE"
2022-01-16T15:45:41.802+0100 [INFO]  cert-monitor: X509 Certificate: index=2 NotBefore="2020-06-19 00:00:42 +0000 UTC"
2022-01-16T15:45:41.802+0100 [INFO]  cert-monitor: X509 Certificate: index=2 NotAfter="2028-01-28 00:00:42 +0000 UTC"
2022-01-16T15:45:41.802+0100 [WARN]  cert-monitor: Certifcate Expired: subject="CN=GTS Root R1,O=Google Trust Services LLC,C=US" Skew Date="2049-06-03 16:45:41.802034899 +0200 CEST m=+864000000.093509265" NotAfter="2028-01-28 00:00:42 +0000 UTC" Skew Days=10000
2022-01-16T15:45:41.802+0100 [INFO]  cert-monitor: X509 Certificate: index=2
-----BEGIN CERTIFICATE-----
MIIFYjCCBEqgAwIBAgIQd70NbNs2+RrqIQ/E8FjTDTANBgkqhkiG9w0BAQsFADBX
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iYH6TKX/1Y7DzkvgtdizjkXPdsDtQCv9Uw+wp9U7DbGKogPeMa3Md+pvez7W35Ei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-----END CERTIFICATE-----

In that case, the expiration warning is displayed:

2022-01-16T15:45:41.802+0100 [WARN]  cert-monitor: Certifcate Expired: subject="CN=GTS Root R1,O=Google Trust Services LLC,C=US" Skew Date="2049-06-03 16:45:41.802034899 +0200 CEST m=+864000000.093509265" NotAfter="2028-01-28 00:00:42 +0000 UTC" Skew Days=10000

--no-text

Disable text output, only the PEM certificates will be displayed.

Tip

Typically, you can use this feature with openssl x509.

For example:

cert-monitor fetch tls --url https://google.com --index 2  --no-text  | openssl x509 -text

cert-monitor fetch tls --url https://google.com --index 2  --no-text 

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

--skip-tls-validation

Disable the validation of TLS certificate (expiration and CA Path Validation).

cert-monitor fetch tls --url https://expired.badssl.com

You will see an error message like:

2022-01-16T15:58:10.455+0100 [ERROR] cert-monitor: Error fetching certificate from remote: url=https://expired.badssl.com err="Head \"https://expired.badssl.com\": x509: certificate has expired or is not yet valid: current time 2022-01-16T15:58:10+01:00 is after 2015-04-12T23:59:59Z"

Example with --skip-tls-validation

cert-monitor fetch tls --url https://expired.badssl.com  --skip-tls-validation --index 0

2022-01-16T15:59:48.174+0100 [INFO]  cert-monitor: X509 Certificate: index=0 Subject="CN=*.badssl.com,OU=Domain Control Validated+OU=PositiveSSL Wildcard"
2022-01-16T15:59:48.174+0100 [INFO]  cert-monitor: X509 Certificate: index=0 Issuer="CN=COMODO RSA Domain Validation Secure Server CA,O=COMODO CA Limited,L=Salford,ST=Greater Manchester,C=GB"
2022-01-16T15:59:48.174+0100 [INFO]  cert-monitor: X509 Certificate: index=0 NotBefore="2015-04-09 00:00:00 +0000 UTC"
2022-01-16T15:59:48.174+0100 [INFO]  cert-monitor: X509 Certificate: index=0 NotAfter="2015-04-12 23:59:59 +0000 UTC"
2022-01-16T15:59:48.174+0100 [WARN]  cert-monitor: Certifcate Expired: subject="CN=*.badssl.com,OU=Domain Control Validated+OU=PositiveSSL Wildcard" Skew Date="2022-04-16 16:59:48.174549501 +0200 CEST m=+7776000.656172049" NotAfter="2015-04-12 23:59:59 +0000 UTC" Skew Days=90
2022-01-16T15:59:48.174+0100 [INFO]  cert-monitor: X509 Certificate: index=0
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----