Bug #71050 [Com]: SubjectAltName (SAN) is Not included in openssl_csr_sign of a new CSR

Edit report at https://bugs.php.net/bug.php?id=71050&edit=1 ID: 71050 Comment by: doldev at snowgarden dot ch Reported by: jimmmaaay at hotmail dot com Summary: SubjectAltName (SAN) is Not included in openssl_csr_sign of a new CSR Status: Open Type: Bug Package: OpenSSL related Operating System: Windows & CentOS 6.7 PHP Version: 7.0.0 Block user comment: N Private report: N New Comment: This is not a bug. Even though the CSR contains the Subject Alternative Name it's up to the CA (Certificate Authority) to include the x509 extension (in your case Subject Alternative Name) requested in the CSR. To openssl_csr_sign function is not copying the x509 extensions to the certificate. This behavior needs to be configured as well in the openssl.cnf. Addition to the '[ req ]' config settings you need a '[ ca ]' section [1]. A basic configuration example can be found here [2]. Similar to your 'req' config a 'subjectAltName' must be added. For a self signed I recommend setting 'basicConstraints' [3] as well. Similar to openssl_csr_new you have to define the 'config' parameter for openssl_csr_sign. IMHO this bug can be closed. I hope it clear that the certificate not automatically inherits all the x509 extensions from the CSR. This would be very dangerous. Especially if someone could trick a CA to generate a certificate with the basicConstraints=CA:TRUE, which is comparable to an intermediate certificate. [1] https://github.com/openssl/openssl/blob/2cc7acd273bc39f1360aed52400d18bb65b88a95/apps/openssl.cnf#L36 [2] https://www.openssl.org/docs/manmaster/apps/ca.html#EXAMPLES [3] https://www.openssl.org/docs/manmaster/apps/x509v3_config.html#Basic-Constraints Previous Comments: ------------------------------------------------------------------------ [2015-12-07 12:37:07] jimmmaaay at hotmail dot com Description: ------------ When creating a new CSR and self-signing it. The SAN (Subject Alternative Name) is not included . --- From manual page: http://www.php.net/function.openssl-csr-sign --- Test script: --------------- $certificate_key_private_resource=openssl_pkey_new(["digest_alg"=>"sha256","private_key_bits"=>2048,"private_key_type"=>OPENSSL_KEYTYPE_RSA]); $csr=openssl_csr_new(["countryName"=>'CA',"stateOrProvinceName"=>'State',"localityName"=>'City',"organizationName"=>'Company','organizationalUnitName'=>'Unit',"commonName"=>'example.org',"emailAddress"=>'email@email.com'],$certificate_key_private_resource,['config'=>'CUSTOM_CONFIG_FILE_PATH']); $sscert=openssl_csr_sign($csr,null,$certificate_key_private_resource,365);openssl_x509_export($sscert,$c,false); echo $c; ---------------------------- OPENSSL CUSTOM CONFIG FILE ---------------------------- [ req ] default_bits = 2048 default_keyfile = privkey.pem distinguished_name = req_distinguished_name req_extensions = req_ext [ req_distinguished_name ] countryName = Country Name (2 letter code) countryName_default = US stateOrProvinceName = State or Province Name (full name) stateOrProvinceName_default = Illinois localityName = Locality Name (eg, city) localityName_default = Chicago organizationName = Organization Name (eg, company) organizationName_default = Example, Co. commonName = Common Name (eg, YOUR name) commonName_max = 64 [ req_ext ] subjectAltName = @alt_names [alt_names] DNS.1 = exmaple.org DNS.2 = www.example.org ---------------------------- OPENSSL CUSTOM CONFIG FILE END ---------------------------- Expected result: ---------------- outputted cert should contain Subject Alternative Name Actual result: -------------- outputted cert does not contain Subject Alternative Name ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=71050&edit=1