Hi Tilman,
Thanks for your insight. In CertInformationCollector#traverseChain, I check for
a missing certInfo.issuerUrl and populate it with
"http://secure.globalsign.com/cacert/root-r3.crt";, which did the trick. (For
anyone else who comes across this thread, you will need to use the URL for the
issuer of the highest certificate in your PDF).
I don't think I would have figured this out without your help, I really
appreciate you taking the time.
The code now looks like this:
if (certInfo.issuerUrl == null) {
certInfo.issuerUrl = "http://secure.globalsign.com/cacert/root-r3.crt";;
}
getAlternativeIssuerCertificate(certInfo, maxDepth);
On 2020/06/23 18:04:19, Tilman Hausherr <[email protected]> wrote:
> Another problem is that the "highest" certificate does not have an URL
> to download the root. So I can't get that one.
>
> A solution would be that you change the code so that you keep a set of
> certificates that you trust and look there when one is missing.
>
> Tilman
>
> Am 23.06.2020 um 19:00 schrieb Tilman Hausherr:
> > Hi,
> >
> > Yeah, the log output is confusing, I'll improve it slightly to output
> > what it was searching for. I ran ShowSignature and it's the root
> > certificate that is missing in the chain.
> >
> > Tilman
> >
> > Am 23.06.2020 um 14:59 schrieb Chris Parton:
> >> Hi all, I'm trying to use the example AddValidationInformation[1]
> >> class to add LTV to an existing signed PDF. I've tried with a signed
> >> PDF of my own, and a sample GlobalSign[2] PDF.
> >>
> >> In both cases, I get the same error, and a 0kb PDF generated. Logs[4]
> >> are at the bottom of this post.
> >>
> >> Steps to reproduce:
> >> 1. git clone [email protected]:apache/pdfbox.git
> >> 2. cd pdfbox/examples
> >> 3. mvn clean install
> >> 4. Open pdfbox project in IntelliJ
> >> 5. Run AddValidationInformation class, with the downloaded
> >> GlobalSign pdf as a program argument
> >>
> >> The GlobalSign PDF has LTV enabled already, but I get the same error
> >> on my own document which doesn't have LTV. For my own document, I can
> >> enable LTV via Adobe Acrobat's UI[3], which makes me think the
> >> document itself is fine.
> >>
> >> Can anybody shed some light on why this might be happening? The
> >> recursive traverseChain() method seems to spin until it hits the end
> >> of the certificate chain, and continues to look for an issuer cert.
> >>
> >> Thanks so much, I appreciate your help! Let me know if you need any
> >> more information and I'll do my best to provide it.
> >>
> >> [1]
> >> https://github.com/apache/pdfbox/blob/2.0.20/examples/src/main/java/org/apache/pdfbox/examples/signature/validation/AddValidationInformation.java
> >>
> >> [2]
> >> https://storage.pardot.com/707663/57753/globalsign_parchment_digital_signatures_case_study.pdf
> >>
> >> [3]
> >> https://www.ssl.com/how-to/long-term-validation-ltv-of-pdf-digital-signatures-in-adobe-acrobat/#enable
> >>
> >> [4] App logs
> >> Jun. 23, 2020 10:51:19 PM
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector
> >> getAlternativeIssuerCertificate
> >> INFO: Get alternative issuer certificate from:
> >> http://secure.globalsign.com/cacert/gsaatl2sha2g2.crt
> >> Jun. 23, 2020 10:51:19 PM
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector
> >> getAlternativeIssuerCertificate
> >> INFO: Get alternative issuer certificate from:
> >> http://secure.globalsign.com/cacert/gsaatlsha2g2.crt
> >> Jun. 23, 2020 10:51:19 PM
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector
> >> getAlternativeIssuerCertificate
> >> SEVERE: Error getting alternative issuer certificate from
> >> http://secure.globalsign.com/cacert/gsaatlsha2g2.crt
> >> java.io.IOException: No Issuer Certificate found for Cert:
> >> CN=GlobalSign CA for AATL - SHA256 - G2, O=GlobalSign nv-sa, C=BE
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.traverseChain(CertInformationCollector.java:257)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.getAlternativeIssuerCertificate(CertInformationCollector.java:291)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.traverseChain(CertInformationCollector.java:211)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.getAlternativeIssuerCertificate(CertInformationCollector.java:291)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.traverseChain(CertInformationCollector.java:211)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.processSignerStore(CertInformationCollector.java:182)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.getCertInfo(CertInformationCollector.java:109)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.getLastCertInfo(CertInformationCollector.java:87)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.AddValidationInformation.doValidation(AddValidationInformation.java:130)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.AddValidationInformation.validateSignature(AddValidationInformation.java:108)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.AddValidationInformation.main(AddValidationInformation.java:588)
> >>
> >> Jun. 23, 2020 10:51:19 PM
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector
> >> traverseChain
> >> INFO: Found the right Issuer Cert! for Cert: CN=GlobalSign CA 2 for
> >> AATL, O=GlobalSign nv-sa, C=BE
> >> CN=GlobalSign CA for AATL - SHA256 - G2, O=GlobalSign nv-sa, C=BE
> >> Jun. 23, 2020 10:51:19 PM
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector
> >> getAlternativeIssuerCertificate
> >> SEVERE: Error getting alternative issuer certificate from
> >> http://secure.globalsign.com/cacert/gsaatl2sha2g2.crt
> >> java.io.IOException: No Issuer Certificate found for Cert:
> >> CN=GlobalSign CA for AATL - SHA256 - G2, O=GlobalSign nv-sa, C=BE
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.traverseChain(CertInformationCollector.java:257)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.traverseChain(CertInformationCollector.java:250)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.getAlternativeIssuerCertificate(CertInformationCollector.java:291)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.traverseChain(CertInformationCollector.java:211)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.processSignerStore(CertInformationCollector.java:182)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.getCertInfo(CertInformationCollector.java:109)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.getLastCertInfo(CertInformationCollector.java:87)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.AddValidationInformation.doValidation(AddValidationInformation.java:130)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.AddValidationInformation.validateSignature(AddValidationInformation.java:108)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.AddValidationInformation.main(AddValidationInformation.java:588)
> >>
> >> Jun. 23, 2020 10:51:19 PM
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector
> >> traverseChain
> >> INFO: Found the right Issuer Cert! for Cert:
> >> [email protected], CN=Marketing, O="GMO
> >> GlobalSign, Inc.", L=Portsmouth, ST=New Hampshire, C=US
> >> CN=GlobalSign CA 2 for AATL, O=GlobalSign nv-sa, C=BE
> >> Jun. 23, 2020 10:51:19 PM
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector
> >> traverseChain
> >> INFO: Found the right Issuer Cert! for Cert: CN=GlobalSign CA 2 for
> >> AATL, O=GlobalSign nv-sa, C=BE
> >> CN=GlobalSign CA for AATL - SHA256 - G2, O=GlobalSign nv-sa, C=BE
> >> Exception in thread "main" java.io.IOException: No Issuer Certificate
> >> found for Cert: CN=GlobalSign CA for AATL - SHA256 - G2, O=GlobalSign
> >> nv-sa, C=BE
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.traverseChain(CertInformationCollector.java:257)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.traverseChain(CertInformationCollector.java:250)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.traverseChain(CertInformationCollector.java:250)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.processSignerStore(CertInformationCollector.java:182)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.getCertInfo(CertInformationCollector.java:109)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.CertInformationCollector.getLastCertInfo(CertInformationCollector.java:87)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.AddValidationInformation.doValidation(AddValidationInformation.java:130)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.AddValidationInformation.validateSignature(AddValidationInformation.java:108)
> >> at
> >> org.apache.pdfbox.examples.signature.validation.AddValidationInformation.main(AddValidationInformation.java:588)
> >>
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