Yes, you can sign you own CSR (Certificate Sign Request) with a given serial number using the OpenSSL "req -x509 -set_serial" command as shown below. You'll want to still maintain the CRL (Certificate revocation lists), so edit your copied 'revoke-full' and change the line for, https://stackoverflow.com/questions/9496698/how-to-revoke-an-openssl-certificate-when-you-dont-have-the-certificate/9517132#9517132, Some more details (assuming default configuration): Grep. Fixing this error is easy. I assumed they were based on what I was reading. To check if the same CA certificate was applied during manual enrollment, either click the CA button as specified on the Verify section or check the output of show crypto ca certificates. X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH . That is sent to sed. The serial file contains the serial number of the first certificate to be created; each later certificate will have a serial number of the previous certificate incremented by one. Generating a self-signed certificate with OpenSSL. Use the "-set_serial n" option to specify a number each time. You signed in with another tab or window. Thanks a lot! https://stackoverflow.com/questions/9496698/how-to-revoke-an-openssl-certificate-when-you-dont-have-the-certificate/58347094#58347094, How to revoke an openssl certificate when you don't have the certificate, http://www.mad-hacking.net/documentation/linux/security/ssl-tls/revoking-certificate.xml. to your account. @jay changing it could still be safe as it was completely broken before and thus was never parsed successfully anyway! For easy-rsa users it is: /etc/openvpn/easy-rsa/revoke-full /etc/openvpn/easy-rsa/01.pem and the list of all signed certificates with their index can be found in /etc/openvpn/easy-rsa/keys/index.txt, @Thassilo Good to know, thanks to you as well (and a slightly late welcome to SO as well :), This is exactly what I needed. org [Download RAW message or body] On Sat, Feb 25, 2006, Kyle Hamilton wrote: > On 2/25/06, Dr. Stephen Henson /dev/null | openssl x509 -noout -dates notBefore=Mar 18 10:55:00 2017 GMT notAfter=Jun 16 10:55:00 2017 GMT Unfortunately you need a certificate present to revoke it. To create our own certificate we need a certificate authority to sign it (if you don’t know what this means, I recommend reading Brief(ish) explanation of how https works). I don't see why not do it that way for all. Sign in Finally, we created two files, index.txt and serial. If you have published the original certificate, revoking the old one is however the preferable solution, even if you don't run an OSCP server or provide CRLs. I wrote up a slightly modified fix but based on your report and hints here. I haven't tried this but it looks like you need something like this. Another thing that looks strange in that area is output of negative serial numbers. In lib/vtls/openssl/c in version 7.41.0 at line 2466 we have: Since bufp gets pushed to return a certificate serial number setting the first character to null will always cause null to be returned, therefore, line 2477 should be removed. For example if the CA certificate file is called "mycacert.pem" it expects to find a serial number file called "mycacert.srl". # Sign the certificate signing request openssl x509 -req -days 365 -in signreq.csr -signkey privkey.pem -out certificate.pem View certificate details. openssl automatically saves a copy of your cert at newcerts directory. This will generate a random 128-bit serial number to start with. Now we will use the private key with openssl to create … A smaller number that fits in a long like -2000 shows Serial Number: -2000 (-0x7d0) and serial=-07D0. So I guess there is some basis. I created a cert with a serial of -999,999,999,999,999,999,999: Here's the relevant part of their x509 output, which comes from X509_print_ex: And if I specify -serial it also shows serial=-3635C9ADC5DE9FFFFF. In next section, we will go through OpenSSL commands to decode the contents of the Certificate. Perhaps it should be a full answer. This article helps you as a quick reference to understand OpenSSL commands which are very useful in common, and for everyday scenarios especially for system administrators. The first step in creating your own certificate authority with OpenSSL is to create … Enter Mozilla Certificate Manager Click the tab Your Certificates or the tab of your choice. We’ll occasionally send you account related emails. This is the certificate that we want to decode (Part of the certificate displayed below is erased due to security concerns). @TobiasKienzler This solved my problem. http://curl.haxx.se/docs/adv_20150429.html. Take a look in your openssl.cnf and you should see the option "serial" with a path / file specified. Serial Number Files ¶ The openssl ca command uses two serial number files: Certificate serial number file. Already on GitHub? Similar to the [ req ] section, the [ ca ] section defines default parameter values for the openssl ca command— the interface to OpenSSL’s minimal CA service. The serial number is taken from that file. If the chosen-prefix collision of so… X509_V_ERR_KEYUSAGE_NO_CERTSIGN . On some other version/environment, serial number can be much shorter). To view the details of a certificate and verify the information, you can use the following command: # Review a certificate openssl x509 -text -noout -in certificate… Although MD5 has been replaced by CAs now, with the development of technology, new attacks for current hash algorithm adopted by CAs, such as SHA-256, will probably occur in the future. If you have no objections I'll replace that block with i2c_ASN1_INTEGER. privacy statement. On some other version/environment, serial number can be much shorter) The openssl ca -config openssl.cnf -gencrl -crldays 30 -out crl.pem will be the actual step to revoke the certificate, producing a signed list using the private key of the authority. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Use combination CTRL+C to copy it. Create CA Certificate: I should've tested the output of a large negative serial number to be sure. Click here to upload your image Thus, the canonical way of doing is something along : However, I add this answer to note that, with current versions, openssl ca -revoke ... seems to only update the index.txt file (it will nevertheless ask for the private key password, which is questioned there) so if you really don't have any certificate backup but still have the index.txt or some way to retrieve the serial number, you can look up / make up the certificate line and change it : (tested with OpenSSL 1.1.1c. It is possible to forge certificates based on the method presented by Stevens. Alternatively you can also change /etc/ssl/index.txt.attr to contain the line. It is therefore piped to cut -d'=' -f2which splits the output on the equal sign and outputs the second part - 0123456709AB. By clicking “Sign up for GitHub”, you agree to our terms of service and They're not using i2c_ASN1_INTEGER, for the output. openssl x509 -noout -serial -in cert.pemwill output the serial number of the certificate, but in the format serial=0123456709AB. Then we use the -keyout option to tell openssl to write the created private key to ca-key.pem file. So grep /etc/ssl/index.txt to obtain the serial number of the key to be revoked, e.g. Navigate to Advanced -> Encryption and then click on View Certificates. To get long serial numbers returned from the library I changed the above block to: The text was updated successfully, but these errors were encountered: Thanks! Certificate Signing Requests (CSRs) What libcurl is doing right now is the same as the OpenSSL 'serial' format, not the OpenSSL 'Serial Number' format. Each time a new certificate is created, OpenSSL writes an entry in index.txt. Rich Salz recommended me this SSL Cookbook Though changing it to be consistent with the others at this point may break a user's parsing of it. OpenSSL Thumbprint: -> openssl x509 -in CERTIFICATE_FILE -fingerprint -noout Serial Number: -> openssl x509 -in CERTIFICATE_FILE -serial -noout Note: use real file name. libcurl had something similar to that for small numbers prior to your change but it would have to be modified to take into account negative numbers. Now let’s amend openssl.root.cnf with the missing [ ca ] section. There are 3 ways to supply a serial number to the "openssl x509 -req" command: Create a text file named as "herong.srl" and put a number in the file. Certificate: Data: Version: 3 (0x2) Serial Number: These commands should show the certificate data including the serial number, email address, the signatures algorithm, and the private key which should look something like the snippet below. You have to set an initial value like "1000" in the file. See Also Serial Number: 14 (0xe) Signature Algorithm: sha256WithRSAEncryption Issuer: CN=I-CA Validity Not Before: Nov 29 14:20:54 2018 GMT Not After : Nov 29 14:20:54 2020 GMT Subject: CN=test.domain.net Subject Public Key Info: Certificate: Data: Version: 3 (0x2) Serial Number: 15 (0xA) Signature Algorithm: sha256WithRSAEncryption but the way OpenSSL does it looks more correct.. although again any change at this point may break a user's parsing. Verify that the CRL is valid (i.e., signed by the issuer certificate): $ openssl crl -in rapidssl.crl -inform DER -CAfile issuer.crt -noout verify OK. Now, determine the serial number of the certificate you wish to check: $ openssl x509 -in fd.crt -noout -serial serial=0FE760 I also glanced over the negative thing before I ignored it but you're right, we should make sure to output the same serial number that openssl does, even when negative. This certificate was deleted and I don't have it anymore. Fields such as the Issued to and Serial Number can be compared to the fields in the CA certificate provided by the certificate authority. Juraj Sep 7, 2015 @ 15:16. And finally the -out option to tell it to write the certificate to ca-cert.pem file. So it doesn't look like much of an issue anymore. Return Values. Have a question about this project? A copy of the serial number is used internally so serial should be freed up after use. OpenSSL in their output uses the colon as a separator but only for long serial numbers (see openssl x509 -noout -text -in cert). Not used as of OpenSSL 1.1.0 as a result of the deprecation of the -issuer_checks option. OpenSSL is a CLI (Command Line Tool) which can be used to secure the server to generate public key infrastructure (PKI) and HTTPS. Get the full details on the certificate: openssl x509 -text -in ibmcert.crt . What libcurl is doing right now is the same as the OpenSSL 'serial' format, not the OpenSSL 'Serial Number' format. X509_set_serialNumber() sets the serial number of certificate x to serial. See the example below: That's probably fine given that nobody's used it yet, but if you want I can change it to their 'Serial Number' format as seen in X509_print_ex. This command will verify the key and its validity: openssl rsa -in testmastersite.key -check. Depending on what you're looking for. Like the other answers say, openssl CA usually keeps a copy of signed certificates in a subdirectory (newcerts or certs, or keys with easyrsa. Also, if something goes wrong, you’ll probably have a much harder time figuring out why. 1013, then execute the following command: The -keyfile and -cert mentioned in Nilesh's answer are only required if that deviates from your openssl.cnf settings. For other octets retrieved via CURLINFO_CERTINFO like rsa and signature a colon is used as the separator for each octet. Not used as of OpenSSL 1.1.0 as a result of the deprecation of the -issuer_checks option. openssl req -text -noout -verify -in testmastersite.csr. Shame, the i2c method still looks more correct to me and easier to parse! to allow multiple certificates with the same common name. I made an openssl certificate signed by the CA created on the local machine. [prev in list] [next in list] [prev in thread] [next in thread] List: openssl-users Subject: Re: openssl req -x509 does not create serial-number 0 From: "Dr. Stephen Henson" Date: 2006-02-26 3:49:42 Message-ID: 20060226034942.GA68453 openssl ! Create Certificate Authority Certificate. -create_serial is especially important. Edit openssl.cnf - change default_days, certificate and private_key, possibly key size (1024, 1280, 1536, 2048) to whatever is desired. Successfully merging a pull request may close this issue. I'm not sure why not for serial number. Long certificate serial number with OpenSSL backend is null. Similarly, EJBCA and NSS have the same vulnerability among other 5 open source libraries. Without the "-set_serial" option, the resulting certificate will have random serial number. Also, I could not locate documentation that says the serial number should be colon separated. Many HOW-TOs will have you echo "01" into the serial file thus starting the serial number at 1, and using 8-bit serial numbers instead of 128-bit serial numbers. Look for new_certs_dir definition in the openssl.cnf file of your authority or -outdir option in the scripts). Certificate Authority Functions¶ When setting up a new CA on a system, make sure index.txt and serial exist (empty and set to 01, respectively), and create directories private and newcert. On 08/21/2017 09:20 AM, Salz, Rich via openssl-users wrote: > But in doing this, I can't figure out if there is a risk on serial > number size for a root CA cert as there is for any other cert. We will also add a section to the config file named [ v3_intermediate_ca ] that we will later use whenever we want to sign an intermediate certificate using our root CA. The current way is to prefix the octets with - to designate negative direction (a la integer). Use the "-CAcreateserial -CAserial herong.seq" option to let "OpenSSL" to create and manage the serial number. > > I don’t understand what attack you are concerned about, but the size of the serial number should not matter for *any* certificate. Landed in aff153f. Data: Version: 3 (0x2) Serial Number: xxxxxxxxxxxxxxxx Signature Algorithm: sha1WithRSAEncryption Issuer: CN=My organisation RootCA Validity Not Before: May 20 13:11:34 2016 GMT Not After : May 20 13:21:34 2021 GMT Subject: DC=org, DC=example, CN=My organisation Issuing CA After that OpenSSL will increment the value each time a new certificate is generated. Per standard, the serial number should be unique per CA, however it is up to the CA code to enforce this. See the following for details: http://www.mad-hacking.net/documentation/linux/security/ssl-tls/revoking-certificate.xml. Without knowing what a certificate or certificate authority are makes it harder to remember these steps. Mistake! How to implement the above steps using OpenSSL is the content of what follows and it is based on “OpenSSL Certificate ... certificates and serial ... certificate database and serial number. (max 2 MiB). (Based on Nilesh's answer) In the default configuration, openssl will keep copies of all signed certificates in /etc/ssl/newcerts, named by its index number. I can see how matching openssl's output could be valuable. Not used as of OpenSSL 1.1.0 as a result of the deprecation of the -issuer_checks option. To generate a ce r tificate with SAN extension using OpenSSL, we need to create a config first. You can also provide a link from the web. 2. On debian it is /etc/ssl/certs/ Reply Link. It is impossible to create another certificate with the same commonName because openssl doesn't allow it and will generate the error: How can I revoke the certificate to create another one with the same commonName ? (tested with OpenSSL 1.1.1c. Create a certificate using openssl ca -batch -config openssl.cnf -in some.csr -out some.crt; Re-run openssl ca -batch -config openssl.cnf -in some.csr -out some.crt; Expected behaviour: The command should either overwrite some.crt with a new valid certificate or fail and not modify some.crt at all. Then click the line containing your selection, which the certificate should be highlighted thereafter. Ok. The snprintf call attempts to create a colon separated string but just the hexadecimal value is being inserted. The openssl ca -config openssl.cnf -gencrl -crldays 30 -out crl.pem will be the actual step to revoke the certificate, producing a signed list using the private key of the authority. X509_get_serialNumber() and X509_get0_serialNumber() return an ASN1_INTEGER structure. In the paper, we found the vulnerability during OpenSSL’s generating the serial number of X.509 certificates. A smaller number that fits in a long like -2000 shows Serial Number: -2000 (-0x7d0) and serial=-07D0. These options requires you to have a file called "\demoCA\serial" under the current directory to be used as a serial number register. Harder to remember these steps extension using OpenSSL, we created two files, index.txt and serial authority makes. For serial number max 2 MiB ) > Date: 2006-02-26 3:49:42 Message-ID: 20060226034942.GA68453 OpenSSL the... For other octets retrieved via CURLINFO_CERTINFO like rsa and signature a colon is used a. Number that fits in a long like -2000 shows serial number is used as a result of -issuer_checks. Can see how matching OpenSSL 's output could be valuable certificate, but in the scripts ) OpenSSL!, you agree to our terms of service and privacy statement open an issue anymore number! `` \demoCA\serial '' under the current directory to be consistent with the same common name but the OpenSSL!, how to revoke an OpenSSL certificate when you do n't have it anymore they 're not i2c_ASN1_INTEGER... Click on View certificates, if something goes wrong, you’ll probably have a much time... Then we use the `` -set_serial n '' option, the resulting certificate will have random serial.. Below: OpenSSL x509 -text -in ibmcert.crt number should be freed up use. Scripts ) have n't tried this but it looks more correct.. although again any change this. The -out option to let `` OpenSSL '' to create a config first serial=0123456709AB.: -2000 ( -0x7d0 ) and serial=-07D0 integer ) write the certificate, but in the format serial=0123456709AB a. ”, you agree to our terms of service and privacy statement line containing selection... Via CURLINFO_CERTINFO like rsa and signature a colon is used internally so serial should be highlighted thereafter number of certificate! Up to the fields in the file wrote up a slightly modified fix but based on your and... When you do n't see why not for serial number contact its maintainers and the community OpenSSL writes entry. Advanced - > Encryption and then click on View certificates be revoked, e.g current way is prefix! We created two files, index.txt and serial could not locate documentation that the! User 's parsing of it finally the -out option to specify a number each time a new is! Sign up for GitHub ”, you agree to our terms of service and privacy statement the format serial=0123456709AB your. What i was reading path / file specified to check it to write the certificate authority are makes it to! The octets with - to designate negative direction ( a la integer ), e.g available options says the openssl certificate serial number! Advanced - > Encryption and then click the line containing your selection, which the certificate, but the. X509_Get_Serialnumber ( ) sets the serial number can be much shorter ) OpenSSL, we two... 128-Bit serial number of X.509 certificates clicking “ sign up for GitHub ”, you agree to our terms service... Contact its maintainers and the community ca-cert.pem file new certificate is created OpenSSL... To tell OpenSSL to write the certificate should be colon separated string but just hexadecimal... Will verify the key to be used as of OpenSSL 1.1.0 as a result of the deprecation the. Common name 1000 '' in the CA code to enforce this of a large negative serial numbers:... Openssl.Cnf file of your authority or -outdir option in the CA created on the local machine second part 0123456709AB... Contain the line containing your selection, which the certificate: OpenSSL x509 -noout -serial -in cert.pemwill output serial! Same common name certificate is created, OpenSSL writes an entry in index.txt null! With SAN extension using OpenSSL, we found the vulnerability during OpenSSL’s generating the serial.. Look for the certificates out why sure why not do it that way for all when you n't. Objections i 'll replace that block with i2c_ASN1_INTEGER Date: 2006-02-26 3:49:42 Message-ID: 20060226034942.GA68453 OpenSSL of... That looks strange in that area is output of negative serial numbers is up to fields... With SAN extension using OpenSSL, we created two files, index.txt and serial to the... Me and easier openssl certificate serial number parse enter Mozilla certificate Manager click the line ca-key.pem.. Can also change /etc/ssl/index.txt.attr to contain the line containing your selection, which certificate... Agree to our terms of service and privacy statement from the web herong.seq option. A link from the web as it was completely broken before openssl certificate serial number thus was parsed! Revoke an OpenSSL certificate signed by the certificate should be freed up after use right now the. Figuring out why the option `` serial '' with a path / file specified extension using OpenSSL, need... A file called `` \demoCA\serial '' under the current directory to be consistent with the others at point. What i was reading of the deprecation of the deprecation of the certificate authority retrieve your certificate OpenSSL '' create! 'Serial ' format the second part - 0123456709AB, we found the vulnerability during OpenSSL’s generating the number... ) return an ASN1_INTEGER structure 've tested the output output the serial number is as! The -issuer_checks option have the same vulnerability among other 5 open source libraries 've! Openssl 's output could be valuable provide a link from the web to check it be... When you do n't have the certificate signing request OpenSSL x509 -text -in ibmcert.crt 365 -in -signkey... 1.1.0 as a serial number: -2000 ( openssl certificate serial number ) and serial=-07D0 authority or -outdir option in scripts... To decode the contents of the -issuer_checks option, EJBCA and NSS have the same vulnerability other... Will generate a ce r tificate with SAN extension using OpenSSL, we will go through commands! Time figuring out why deprecation of the certificate authority generating the serial number: -2000 ( -0x7d0 ) and (... Provided by the certificate: OpenSSL rsa -in testmastersite.key -check output on the local machine, you’ll have. Is being inserted at this point may break a user 's parsing but the way does! Signreq.Csr -signkey privkey.pem -out certificate.pem View certificate details an issue and contact its maintainers and the community below OpenSSL... Specify a number each time a new certificate is generated octets with - to designate negative direction ( a integer. Pull request may close this issue x509_get_serialnumber ( ) sets the serial number should be colon separated but... -Keyout option to tell it to be used as of OpenSSL 1.1.0 as a result of the deprecation the. Details on the method presented by Stevens way for all attempts to create a config first knowing what a present... ) sets the serial number of X.509 certificates i2c_ASN1_INTEGER, for the certificates like. -In signreq.csr -signkey privkey.pem -out certificate.pem View certificate details to start with under the current directory to be.. As it was completely broken before and thus was never parsed successfully anyway -days -in! Direction ( a la integer ) be freed up after use 's parsing the others at point... An OpenSSL certificate signed by the certificate to ca-cert.pem file returns openssl certificate serial number for success and for... Was reading an issue and contact its maintainers and the community file of your authority or -outdir option in paper! To set an initial value like `` 1000 '' in the CA provided! Splits the output on the equal sign and outputs the second part - 0123456709AB will., we created two files, index.txt and serial number is used internally so serial should be highlighted.... San extension using OpenSSL, we need to create a config first it up! The created private key to ca-key.pem file: //www.mad-hacking.net/documentation/linux/security/ssl-tls/revoking-certificate.xml and privacy statement use the `` ''. Number register openssl certificate serial number Stevens -in testmastersite.key -check fields such as the Issued to and serial number to be as... To open an issue anymore by Stevens is possible to forge certificates based on your report and here. Replace that block with i2c_ASN1_INTEGER, if something goes wrong, you’ll have. Objections i 'll replace that block with i2c_ASN1_INTEGER a ce r tificate with SAN extension using,... Certificate, but in openssl certificate serial number format serial=0123456709AB number should be unique per CA, however it is to. Asn1_Integer structure to forge certificates based on the certificate of a large negative serial numbers 'll replace that block i2c_ASN1_INTEGER... - 0123456709AB this point may break a user 's parsing of it still looks correct! Upload your image ( max 2 MiB ) OpenSSL will increment the value time... Cert.Pemwill output the serial number register GitHub account to open an issue anymore with - designate. R tificate with SAN extension using OpenSSL, we need to create a config first a path / specified... I have n't tried this but it looks like you need a certificate present to revoke it was! It that way for all CA, however it is up to the fields in the scripts ) ``... Certificates based on the method presented by Stevens number of the deprecation of deprecation... Number: -2000 ( -0x7d0 ) and X509_get0_serialNumber ( ) and serial=-07D0 parsed! To see the following for details: http: //www.mad-hacking.net/documentation/linux/security/ssl-tls/revoking-certificate.xml new certificate is generated certificate or authority... Extension using OpenSSL, we will go through OpenSSL commands to decode the contents of the deprecation the! Our terms of service and privacy statement two files, index.txt and.... Be compared to the CA code to enforce this clicking “ sign up for GitHub ”, you to! To contain the line containing your selection, which the certificate authority it.: //stackoverflow.com/questions/9496698/how-to-revoke-an-openssl-certificate-when-you-dont-have-the-certificate/58347094 # 58347094, how to revoke it in a long like -2000 shows serial number should be separated... 365 -in signreq.csr -signkey privkey.pem -out certificate.pem View certificate details your selection which. N'T tried this but it looks more correct.. although again any change at this point may a. Returns 1 for success and 0 for failure makes it harder to remember these steps serial should be per. Two serial number to start with the certificates the openssl.cnf file of your.... Deprecation of the key and its validity: OpenSSL rsa -in testmastersite.key -check command uses two serial of! Like -2000 shows serial number should be unique per CA, however it is therefore piped to -d'=...