X509: add tests for purpose code signing in verify application

Correct configuration according to CA Browser forum:
  KU: critical,digitalSignature
  XKU: codeSiging

Note: I did not find any other document formally defining the requirements
for code signing certificates.

Some combinations are explicitly forbidden, some flags can be ignored

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18567)

8 files changed, 127 insertions, 2 deletions

diff --git a/test/certs/ee-codesign-anyextkeyusage.pem b/test/certs/ee-codesign-anyextkeyusage.pem
new file mode 100644
index 0000000000..1523f60784
--- /dev/null
+++ b/test/certs/ee-codesign-anyextkeyusage.pem
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDGzCCAgOgAwIBAgIBAjANBgkqhkiG9w0BAQsFADANMQswCQYDVQQDDAJDQTAg
+Fw0yMjA2MTUxNjM0MDNaGA8yMTIyMDYxNjE2MzQwM1owGTEXMBUGA1UEAwwOc2Vy
+dmVyLmV4YW1wbGUwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCo/4lY
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+PGkczOapAXRJRm7pRzI5m3lj07ITwdWiliu9Uv8KRKxkOunmSIGVBkeNMf7gGBiA
+1k4+o8wcWcQZmsP6RxEvSm6k5610oHi0z0CVgijghw==
+-----END CERTIFICATE-----
diff --git a/test/certs/ee-codesign-crlsign.pem b/test/certs/ee-codesign-crlsign.pem
new file mode 100644
index 0000000000..f604f99ceb
--- /dev/null
+++ b/test/certs/ee-codesign-crlsign.pem
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDFTCCAf2gAwIBAgIBAjANBgkqhkiG9w0BAQsFADANMQswCQYDVQQDDAJDQTAg
+Fw0yMjA2MTUxNjA1NDFaGA8yMTIyMDYxNjE2MDU0MVowGTEXMBUGA1UEAwwOc2Vy
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+j/ijMGyZOZXH4KkNCGxROyw0iHB7nZ5IdXLbpDDycJkixmmUBNjBh5huxgfzwGHT
+ePW/iHQzvEzUWZJf3cx9GKRj5z2lJf9tPA==
+-----END CERTIFICATE-----
diff --git a/test/certs/ee-codesign-keycertsign.pem b/test/certs/ee-codesign-keycertsign.pem
new file mode 100644
index 0000000000..8ba53eca1f
--- /dev/null
+++ b/test/certs/ee-codesign-keycertsign.pem
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDFTCCAf2gAwIBAgIBAjANBgkqhkiG9w0BAQsFADANMQswCQYDVQQDDAJDQTAg
+Fw0yMjA2MTUxNjA1NDFaGA8yMTIyMDYxNjE2MDU0MVowGTEXMBUGA1UEAwwOc2Vy
+dmVyLmV4YW1wbGUwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCo/4lY
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+xcyOAvRACEO3AlOLlKO00VjYfSc4zyf40LSme/DQOz9CWaAjOdpjF/AlWK5lHyB4
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+DY/MqhvkZNTfHfvI9+jmiUG3+dpcDmrjL/IgtBlZjFTKroOdXVjMj0j1oUvhSjWB
+s1OhZ5bfbu9ZfwqQ0FqW3vzmJFENHxZmXg==
+-----END CERTIFICATE-----
diff --git a/test/certs/ee-codesign-noncritical.pem b/test/certs/ee-codesign-noncritical.pem
new file mode 100644
index 0000000000..f15aafdb5b
--- /dev/null
+++ b/test/certs/ee-codesign-noncritical.pem
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDEjCCAfqgAwIBAgIBAjANBgkqhkiG9w0BAQsFADANMQswCQYDVQQDDAJDQTAg
+Fw0yMjA2MTUxNDI0MDBaGA8yMTIyMDYxNjE0MjQwMFowGTEXMBUGA1UEAwwOc2Vy
+dmVyLmV4YW1wbGUwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCo/4lY
+YYWu3tssD9Vz++K3qBt6dWAr1H08c3a1rt6TL38kkG3JHPSKOM2fooAWVsu0LLuT
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+fIS0GL+9Pb/nm8b4UCcJDcNBut/TQnDZR5DysgrXCh0dXBFH5XZCczetbw4pW87I
+vIgtz2if2ZzhbxAfWRBCa7razHVNIQ==
+-----END CERTIFICATE-----
diff --git a/test/certs/ee-codesign-serverauth.pem b/test/certs/ee-codesign-serverauth.pem
new file mode 100644
index 0000000000..c1aececd36
--- /dev/null
+++ b/test/certs/ee-codesign-serverauth.pem
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDHzCCAgegAwIBAgIBAjANBgkqhkiG9w0BAQsFADANMQswCQYDVQQDDAJDQTAg
+Fw0yMjA2MTUxNjA1NDFaGA8yMTIyMDYxNjE2MDU0MVowGTEXMBUGA1UEAwwOc2Vy
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+NjNoFebf6p842zU9EH8tF/m+CkCPAHpGOsrc1+bf77jpmX4=
+-----END CERTIFICATE-----
diff --git a/test/certs/ee-codesign.pem b/test/certs/ee-codesign.pem
new file mode 100644
index 0000000000..230126eb9e
--- /dev/null
+++ b/test/certs/ee-codesign.pem
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDFTCCAf2gAwIBAgIBAjANBgkqhkiG9w0BAQsFADANMQswCQYDVQQDDAJDQTAg
+Fw0yMjA2MTUxNDIyMDZaGA8yMTIyMDYxNjE0MjIwNlowGTEXMBUGA1UEAwwOc2Vy
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+3sSdH6Ucc1agUAlQQWjXoPTcSEkti4kJaQ==
+-----END CERTIFICATE-----
diff --git a/test/certs/mkcert.sh b/test/certs/mkcert.sh
index c3f7ac14b5..88e8740037 100755
--- a/test/certs/mkcert.sh
+++ b/test/certs/mkcert.sh
@@ -233,12 +233,14 @@ geneealt() {
 genee() {
     local OPTIND=1
     local purpose=serverAuth
+    local ku=
 
-    while getopts p: o
+    while getopts p:k: o
     do
         case $o in
         p) purpose="$OPTARG";;
-        *) echo "Usage: $0 genee [-p EKU] cn keyname certname cakeyname cacertname" >&2
+        k) ku="keyUsage = $OPTARG";;
+        *) echo "Usage: $0 genee [-k KU] [-p EKU] cn keyname certname cakeyname cacertname" >&2
            return 1;;
         esac
     done
@@ -254,6 +256,7 @@ genee() {
 	    "subjectKeyIdentifier = hash" \
 	    "authorityKeyIdentifier = keyid, issuer" \
 	    "basicConstraints = CA:false" \
+            "$ku" \
 	    "extendedKeyUsage = $purpose" \
 	    "subjectAltName = @alts" "DNS=${cn}")
     csr=$(req "$key" "CN = $cn") || return 1
diff --git a/test/certs/setup.sh b/test/certs/setup.sh
index 64cff0293b..8bdb1c5efb 100755
--- a/test/certs/setup.sh
+++ b/test/certs/setup.sh
@@ -185,6 +185,14 @@ openssl x509 -in ee-client.pem -trustout \
 ./mkcert.sh genee -p timeStamping server.example ee-key ee-timestampsign-rfc3161-noncritxku ca-key ca-cert
 ./mkcert.sh genee -p critical,timeStamping -k digitalSignature server.example ee-key ee-timestampsign-rfc3161-digsig ca-key ca-cert
 
+# code signing certificate
+./mkcert.sh genee -p codeSigning -k critical,digitalSignature server.example ee-key ee-codesign ca-key ca-cert
+./mkcert.sh genee -p codeSigning,serverAuth -k critical,digitalSignature server.example ee-key ee-codesign-serverauth ca-key ca-cert
+./mkcert.sh genee -p codeSigning,2.5.29.37.0 -k critical,digitalSignature server.example ee-key ee-codesign-anyextkeyusage ca-key ca-cert
+./mkcert.sh genee -p codeSigning -k critical,digitalSignature,cRLSign server.example ee-key ee-codesign-crlsign ca-key ca-cert
+./mkcert.sh genee -p codeSigning -k critical,digitalSignature,keyCertSign server.example ee-key ee-codesign-keycertsign ca-key ca-cert
+./mkcert.sh genee -p codeSigning -k digitalSignature server.example ee-key ee-codesign-noncritical ca-key ca-cert
+
 # Leaf cert security level variants
 # MD5 issuer signature
 OPENSSL_SIGALG=md5 \