Limit scope of CN name constraints

Don't apply DNS name constraints to the subject CN when there's a
least one DNS-ID subjectAlternativeName.

Don't apply DNS name constraints to subject CN's that are sufficiently
unlike DNS names.  Checked name must have at least two labels, with
all labels non-empty, no trailing '.' and all hyphens must be
internal in each label.  In addition to the usual LDH characters,
we also allow "_", since some sites use these for hostnames despite
all the standards.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tim Hudson <tjh@openssl.org>

12 files changed, 254 insertions, 140 deletions

diff --git a/test/certs/alt1-cert.pem b/test/certs/alt1-cert.pem
index b94d0eaf9d..d68b0e5193 100644
--- a/test/certs/alt1-cert.pem
+++ b/test/certs/alt1-cert.pem
@@ -1,22 +1,21 @@
 -----BEGIN CERTIFICATE-----
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+BG45LEZzGxz+Ad3xRdZyVi1I67v9YShoYTCpMTSxJaR0erH74g==
 -----END CERTIFICATE-----
diff --git a/test/certs/alt1-key.pem b/test/certs/alt1-key.pem
index b5d4d326c5..6df050a38f 100644
--- a/test/certs/alt1-key.pem
+++ b/test/certs/alt1-key.pem
@@ -1,28 +1,28 @@
 -----BEGIN PRIVATE KEY-----
-MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQCwL9V/EvLlKZ40
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 -----END PRIVATE KEY-----
diff --git a/test/certs/badalt6-cert.pem b/test/certs/badalt6-cert.pem
index fbe040b52c..f41568f6ee 100644
--- a/test/certs/badalt6-cert.pem
+++ b/test/certs/badalt6-cert.pem
@@ -1,22 +1,21 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/test/certs/badalt6-key.pem b/test/certs/badalt6-key.pem
index 203a4c7a00..782d69334a 100644
--- a/test/certs/badalt6-key.pem
+++ b/test/certs/badalt6-key.pem
@@ -1,28 +1,28 @@
 -----BEGIN PRIVATE KEY-----
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+m1rTfab8O+tOOGKGyzfouD2A
 -----END PRIVATE KEY-----
diff --git a/test/certs/badalt7-cert.pem b/test/certs/badalt7-cert.pem
index b515ba43d9..4fa81b3c6f 100644
--- a/test/certs/badalt7-cert.pem
+++ b/test/certs/badalt7-cert.pem
@@ -1,23 +1,22 @@
 -----BEGIN CERTIFICATE-----
-MIID1DCCArygAwIBAgIBAjANBgkqhkiG9w0BAQsFADAXMRUwEwYDVQQDDAxUZXN0
-IE5DIENBIDEwIBcNMTYwNzA5MTQ0ODExWhgPMjExNjA3MTAxNDQ4MTFaMIGmMTsw
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 -----END CERTIFICATE-----
diff --git a/test/certs/badalt7-key.pem b/test/certs/badalt7-key.pem
index 50557e8968..b453f1ff30 100644
--- a/test/certs/badalt7-key.pem
+++ b/test/certs/badalt7-key.pem
@@ -1,28 +1,28 @@
 -----BEGIN PRIVATE KEY-----
-MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDUrQclq+9LtgOP
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+iiCseyA7Kr8Axt9QhUzoi5f7
 -----END PRIVATE KEY-----
diff --git a/test/certs/badcn1-cert.pem b/test/certs/badcn1-cert.pem
new file mode 100644
index 0000000000..3b3bad658b
--- /dev/null
+++ b/test/certs/badcn1-cert.pem
@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----
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+yXZFsQ//q7ATwlcHyB81B+X16AI=
+-----END CERTIFICATE-----
diff --git a/test/certs/badcn1-key.pem b/test/certs/badcn1-key.pem
new file mode 100644
index 0000000000..dbcf4b5d44
--- /dev/null
+++ b/test/certs/badcn1-key.pem
@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
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+l3TaNvRKc2VrL0FvzV3ZP2dF3mCCbk7Iq9AqcuBZon6mdvqgNmN1eEGarBZIqAT2
+CDzaHAyZMHU3lBfUjuHeH1nba9CHenAcVkOME2h+MwKBgQDiHAnTK4ovCNmT5E9i
+03x/wPSH8FZ3Wrb1GMtNlTc7lOtB5eYIvwkaloJkNKHbUDv57V66hnYT6CyH4u45
+dPtuohtafL9mdScYqmicGLtbLLglSQpJYt4J59hffNZ30E84dKXtyDN7E5P5Z00Z
+8PbOMUy3oK6j+GMP/xRNI76RtA==
+-----END PRIVATE KEY-----
diff --git a/test/certs/goodcn1-cert.pem b/test/certs/goodcn1-cert.pem
new file mode 100644
index 0000000000..d9205e03b0
--- /dev/null
+++ b/test/certs/goodcn1-cert.pem
@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/test/certs/goodcn1-key.pem b/test/certs/goodcn1-key.pem
new file mode 100644
index 0000000000..2ad660c6db
--- /dev/null
+++ b/test/certs/goodcn1-key.pem
@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----
diff --git a/test/certs/setup.sh b/test/certs/setup.sh
index 98bac0296a..aa69de1c62 100755
--- a/test/certs/setup.sh
+++ b/test/certs/setup.sh
@@ -241,15 +241,30 @@ NC="$NC excluded;DNS:bad.ok.good.com"
 NC=$NC ./mkcert.sh genca "Test NC sub CA" ncca3-key ncca3-cert \
         ncca1-key ncca1-cert
 
-# all subjectAltNames allowed by CA1.
+# all subjectAltNames allowed by CA1.  Some CNs are not!
 
 ./mkcert.sh req alt1-key "O = Good NC Test Certificate 1" \
-    "1.CN=www.good.org" "2.CN=Joe Bloggs" "3.CN=any.good.com" | \
+    "1.CN=www.example.net" "2.CN=Joe Bloggs" | \
     ./mkcert.sh geneealt alt1-key alt1-cert ncca1-key ncca1-cert \
     "DNS.1 = www.good.org" "DNS.2 = any.good.com" \
     "email.1 = good@good.org" "email.2 = any@good.com" \
     "IP = 127.0.0.1" "IP = 192.168.0.1"
 
+# all DNS-like CNs allowed by CA1, no DNS SANs.
+
+./mkcert.sh req goodcn1-key "O = Good NC Test Certificate 1" \
+    "1.CN=www.good.org" "2.CN=any.good.com" \
+    "3.CN=not..dns" "4.CN=not@dns" "5.CN=not-.dns" "6.CN=not.dns." | \
+    ./mkcert.sh geneealt goodcn1-key goodcn1-cert ncca1-key ncca1-cert \
+    "IP = 127.0.0.1" "IP = 192.168.0.1"
+
+# Some DNS-like CNs not permitted by CA1, no DNS SANs.
+
+./mkcert.sh req badcn1-key "O = Good NC Test Certificate 1" \
+    "1.CN=www.good.org" "3.CN=bad.net" | \
+    ./mkcert.sh geneealt badcn1-key badcn1-cert ncca1-key ncca1-cert \
+    "IP = 127.0.0.1" "IP = 192.168.0.1"
+
 # no subjectAltNames excluded by CA2.
 
 ./mkcert.sh req alt2-key "O = Good NC Test Certificate 2" | \
@@ -293,19 +308,17 @@ NC=$NC ./mkcert.sh genca "Test NC sub CA" ncca3-key ncca3-cert \
     "email.1 = good@good.org" "email.2 = any@good.com" \
     "IP = 127.0.0.2"
 
-# all subject alt names OK but subject CN not allowed by CA1.
+# No DNS-ID SANs and subject CN not allowed by CA1.
 ./mkcert.sh req badalt6-key "O = Bad NC Test Certificate 6" \
     "1.CN=other.good.org" "2.CN=Joe Bloggs" "3.CN=any.good.com" | \
     ./mkcert.sh geneealt badalt6-key badalt6-cert ncca1-key ncca1-cert \
-    "DNS.1 = www.good.org" "DNS.2 = any.good.com" \
     "email.1 = good@good.org" "email.2 = any@good.com" \
     "IP = 127.0.0.1" "IP = 192.168.0.1"
 
-# all subject alt names OK but subject CN not allowed by CA1, BMPSTRING
+# No DNS-ID SANS and subject CN not allowed by CA1, BMPSTRING
 REQMASK=MASK:0x800 ./mkcert.sh req badalt7-key "O = Bad NC Test Certificate 7" \
     "1.CN=other.good.org" "2.CN=Joe Bloggs" "3.CN=any.good.com" | \
     ./mkcert.sh geneealt badalt7-key badalt7-cert ncca1-key ncca1-cert \
-    "DNS.1 = www.good.org" "DNS.2 = any.good.com" \
     "email.1 = good@good.org" "email.2 = any@good.com" \
     "IP = 127.0.0.1" "IP = 192.168.0.1"
 
diff --git a/test/recipes/25-test_verify.t b/test/recipes/25-test_verify.t
index a196129233..a85fe0f97e 100644
--- a/test/recipes/25-test_verify.t
+++ b/test/recipes/25-test_verify.t
@@ -27,7 +27,7 @@ sub verify {
     run(app([@args]));
 }
 
-plan tests => 132;
+plan tests => 134;
 
 # Canonical success
 ok(verify("ee-cert", "sslserver", ["root-cert"], ["ca-cert"]),
@@ -300,6 +300,12 @@ ok(verify("alt2-cert", "sslserver", ["root-cert"], ["ncca2-cert"], ),
 ok(verify("alt3-cert", "sslserver", ["root-cert"], ["ncca1-cert", "ncca3-cert"], ),
    "Name Constraints nested test all permitted");
 
+ok(verify("goodcn1-cert", "sslserver", ["root-cert"], ["ncca1-cert"], ),
+   "Name Constraints CNs permitted");
+
+ok(!verify("badcn1-cert", "sslserver", ["root-cert"], ["ncca1-cert"], ),
+   "Name Constraints CNs not permitted");
+
 ok(!verify("badalt1-cert", "sslserver", ["root-cert"], ["ncca1-cert"], ),
    "Name Constraints hostname not permitted");