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: NMatt Caswell <matt@openssl.org>
Reviewed-by: NTim Hudson <tjh@openssl.org>

crypto/asn1/a_strex.c

@@ -624,53 +624,3 @@ int ASN1_STRING_to_UTF8(unsigned char **out, const ASN1_STRING *in)
     *out = stmp.data;
     return stmp.length;
 }
-
-/* Return 1 if host is a valid hostname and 0 otherwise */
-int asn1_valid_host(const ASN1_STRING *host)
-{
-    int hostlen = host->length;
-    const unsigned char *hostptr = host->data;
-    int type = host->type;
-    int i;
-    signed char width = -1;
-    unsigned short chflags = 0, prevchflags;
-
-    if (type > 0 && type < 31)
-        width = tag2nbyte[type];
-    if (width == -1 || hostlen == 0)
-        return 0;
-    /* Treat UTF8String as width 1 as any MSB set is invalid */
-    if (width == 0)
-        width = 1;
-    for (i = 0 ; i < hostlen; i+= width) {
-        prevchflags = chflags;
-        /* Value must be <= 0x7F: check upper bytes are all zeroes */
-        if (width == 4) {
-            if (*hostptr++ != 0 || *hostptr++ != 0 || *hostptr++ != 0)
-                return 0;
-        } else if (width == 2) {
-            if (*hostptr++ != 0)
-                return 0;
-        }
-        if (*hostptr > 0x7f)
-            return 0;
-        chflags = char_type[*hostptr++];
-        if (!(chflags & (CHARTYPE_HOST_ANY | CHARTYPE_HOST_WILD))) {
-            /* Nothing else allowed at start or end of string */
-            if (i == 0 || i == hostlen - 1)
-                return 0;
-            /* Otherwise invalid if not dot or hyphen */
-            if (!(chflags & (CHARTYPE_HOST_DOT | CHARTYPE_HOST_HYPHEN)))
-                return 0;
-            /*
-             * If previous is dot or hyphen then illegal unless both
-             * are hyphens: as .- -. .. are all illegal
-             */
-            if (prevchflags & (CHARTYPE_HOST_DOT | CHARTYPE_HOST_HYPHEN)
-                && ((prevchflags & CHARTYPE_HOST_DOT)
-                    || (chflags & CHARTYPE_HOST_DOT)))
-                return 0;
-        }
-    }
-    return 1;
-}

crypto/include/internal/asn1_int.h

@@ -107,5 +107,4 @@ struct asn1_pctx_st {
     unsigned long str_flags;
 } /* ASN1_PCTX */ ;
 
-int asn1_valid_host(const ASN1_STRING *host);
 int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);

crypto/x509v3/v3_ncons.c

@@ -297,48 +297,155 @@ int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
 
 }
 
+static int cn2dnsid(ASN1_STRING *cn, unsigned char **dnsid, size_t *idlen)
+{
+    int utf8_length;    /* Return type of ASN1_STRING_to_UTF8 */
+    int i;
+    unsigned char *utf8_value;
+    int isdnsname = 0;
+
+    /* Don't leave outputs uninitialized */
+    *dnsid = NULL;
+    *idlen = 0;
+
+    /*-
+     * Per RFC 6125, DNS-IDs representing internationalized domain names appear
+     * in certificates in A-label encoded form:
+     *
+     *   https://tools.ietf.org/html/rfc6125#section-6.4.2
+     *
+     * The same applies to CNs which are intended to represent DNS names.
+     * However, while in the SAN DNS-IDs are IA5Strings, as CNs they may be
+     * needlessly encoded in 16-bit Unicode.  We perform a conversion to UTF-8
+     * to ensure that we get an ASCII representation of any CNs that are
+     * representable as ASCII, but just not encoded as ASCII.  The UTF-8 form
+     * may contain some non-ASCII octets, and that's fine, such CNs are not
+     * valid legacy DNS names.
+     *
+     * Note, 'int' is the return type of ASN1_STRING_to_UTF8() so that's what
+     * we must use for 'utf8_length'.
+     */
+    if ((utf8_length = ASN1_STRING_to_UTF8(&utf8_value, cn)) < 0)
+        return X509_V_ERR_OUT_OF_MEM;
+
+    /*
+     * Some certificates have had names that include a *trailing* NUL byte.
+     * Remove these harmless NUL characters. They would otherwise yield false
+     * alarms with the following embedded NUL check.
+     */
+    while (utf8_length > 0 && utf8_value[utf8_length - 1] == '\0')
+        --utf8_length;
+
+    /* Reject *embedded* NULs */
+    if ((size_t)utf8_length != strlen((char *)utf8_value))
+        return X509_V_ERR_UNSPECIFIED;
+
+    /*
+     * XXX: Deviation from strict DNS name syntax, also check names with '_'
+     * Check DNS name syntax, any '-' or '.' must be internal,
+     * and on either side of each '.' we can't have a '-' or '.'.
+     *
+     * If the name has just one label, we don't consider it a DNS name.  This
+     * means that "CN=sometld" cannot be precluded by DNS name constraints, but
+     * that is not a problem.
+     */
+    for (i = 0; i < utf8_length; ++i) {
+        unsigned char c = utf8_value[i];
+
+        if ((c >= 'a' && c <= 'z')
+            || (c >= 'A' && c <= 'Z')
+            || (c >= '0' && c <= '9')
+            || c == '_')
+            continue;
+
+        /* Dot and hyphen cannot be first or last. */
+        if (i > 0 && i < utf8_length - 1) {
+            if (c == '-')
+                continue;
+            /*
+             * Next to a dot the preceding and following characters must not be
+             * another dot or a hyphen.  Otherwise, record that the name is
+             * plausible, since it has two or more labels.
+             */
+            if (c == '.'
+                && utf8_value[i + 1] != '.'
+                && utf8_value[i - 1] != '-'
+                && utf8_value[i + 1] != '-') {
+                isdnsname = 1;
+                continue;
+            }
+        }
+        isdnsname = 0;
+        break;
+    }
+
+    if (isdnsname) {
+        *dnsid = utf8_value;
+        *idlen = (size_t)utf8_length;
+        return X509_V_OK;
+    }
+    OPENSSL_free(utf8_value);
+    return X509_V_OK;
+}
+
+/*
+ * Check CN against DNS-ID name constraints, provided no DNS-ID
+ * subjectAlternativeName values are present in the certificate.
+ */
 int NAME_CONSTRAINTS_check_CN(X509 *x, NAME_CONSTRAINTS *nc)
 {
     int r, i;
+    GENERAL_NAMES *gens = NULL;
     X509_NAME *nm;
-
     ASN1_STRING stmp;
     GENERAL_NAME gntmp;
+
     stmp.flags = 0;
     stmp.type = V_ASN1_IA5STRING;
     gntmp.type = GEN_DNS;
     gntmp.d.dNSName = &stmp;
 
+    gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
+    if (gens != NULL) {
+        for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
+            GENERAL_NAME *gen = sk_GENERAL_NAME_value(gens, i);
+
+            if (gen->type == GEN_DNS) {
+                GENERAL_NAMES_free(gens);
+                return X509_V_OK;
+            }
+        }
+        GENERAL_NAMES_free(gens);
+    }
+
     nm = X509_get_subject_name(x);
 
     /* Process any commonName attributes in subject name */
 
     for (i = -1;;) {
         X509_NAME_ENTRY *ne;
-        ASN1_STRING *hn;
+        ASN1_STRING *cn;
+        unsigned char *idval;
+        size_t idlen;
 
         i = X509_NAME_get_index_by_NID(nm, NID_commonName, i);
         if (i == -1)
             break;
         ne = X509_NAME_get_entry(nm, i);
-        hn = X509_NAME_ENTRY_get_data(ne);
-        /* Only process attributes that look like host names */
-        if (asn1_valid_host(hn)) {
-            unsigned char *h;
-            int hlen = ASN1_STRING_to_UTF8(&h, hn);
-            if (hlen <= 0)
-                return X509_V_ERR_OUT_OF_MEM;
+        cn = X509_NAME_ENTRY_get_data(ne);
 
-            stmp.length = hlen;
-            stmp.data = h;
-
-            r = nc_match(&gntmp, nc);
-
-            OPENSSL_free(h);
+        /* Only process attributes that look like host names */
+        if ((r = cn2dnsid(cn, &idval, &idlen)) != X509_V_OK)
+            return r;
+        if (idlen == 0)
+            continue;
 
-            if (r != X509_V_OK)
-                    return r;
-        }
+        stmp.length = idlen;
+        stmp.data = idval;
+        r = nc_match(&gntmp, nc);
+        OPENSSL_free(idval);
+        if (r != X509_V_OK)
+            return r;
     }
     return X509_V_OK;
 }

test/certs/alt1-cert.pem

 -----BEGIN CERTIFICATE-----
-MIIDlTCCAn2gAwIBAgIBAjANBgkqhkiG9w0BAQsFADAXMRUwEwYDVQQDDAxUZXN0
-IE5DIENBIDEwIBcNMTYwNzA5MTQ0ODExWhgPMjExNjA3MTAxNDQ4MTFaMGgxIzAh
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-vRlTFVjv65nn
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 -----END CERTIFICATE-----

test/certs/alt1-key.pem

 -----BEGIN PRIVATE KEY-----
-MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQCwL9V/EvLlKZ40
-2t27+5tYyW21+2wvcO5OE38YlOVy/5txITf/xFASUqGpsurxQuqMv+owPF5qbZVa
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+EzX/9GdsRInifN6FfOfo/A==
 -----END PRIVATE KEY-----

test/certs/badalt6-cert.pem

 -----BEGIN CERTIFICATE-----
-MIIDljCCAn6gAwIBAgIBAjANBgkqhkiG9w0BAQsFADAXMRUwEwYDVQQDDAxUZXN0
-IE5DIENBIDEwIBcNMTYwNzA5MTQ0ODExWhgPMjExNjA3MTAxNDQ4MTFaMGkxIjAg
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 BgNVBAoMGUJhZCBOQyBUZXN0IENlcnRpZmljYXRlIDYxFzAVBgNVBAMMDm90aGVy
 Lmdvb2Qub3JnMRMwEQYDVQQDDApKb2UgQmxvZ2dzMRUwEwYDVQQDDAxhbnkuZ29v
-ZC5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDKz8F/ndKz0vuv
-BymjTUjtrWSQsnsuisR+oW8CIliNBi8yqqeNrtoa2s+e2GBC7gxDlK9IOqGo4Ulu
-9jY5On6RysrFWLpK97I7EP9cg63alH+NRFEwczRzErHtYx54yiBjcovcCVeTtdnd
-7/P4T8hIGy6QjdW68lzwnN/I9x11NWoipIKvAOGXz0L/WaPPWZ0GJFlBqEX//O3+
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-GH32QmEN5o5jZQ==
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+e2TXTNpdkn3l+ZK2FYdf7s8fytoe+6o92dN+fA==
 -----END CERTIFICATE-----

test/certs/badalt6-key.pem

 -----BEGIN PRIVATE KEY-----
-MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDKz8F/ndKz0vuv
-BymjTUjtrWSQsnsuisR+oW8CIliNBi8yqqeNrtoa2s+e2GBC7gxDlK9IOqGo4Ulu
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-/pu9qkNFGfYMFwsBUd8pp8zMnv552CCIgalBBFr1hy9q47HBaJPaF2/CjZJmsqkp
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-R1UfsJugW9Yetsqd9WB6q3ln
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+m1rTfab8O+tOOGKGyzfouD2A
 -----END PRIVATE KEY-----

test/certs/badalt7-cert.pem

 -----BEGIN CERTIFICATE-----
-MIID1DCCArygAwIBAgIBAjANBgkqhkiG9w0BAQsFADAXMRUwEwYDVQQDDAxUZXN0
-IE5DIENBIDEwIBcNMTYwNzA5MTQ0ODExWhgPMjExNjA3MTAxNDQ4MTFaMIGmMTsw
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 eQAuAGcAbwBvAGQALgBjAG8AbTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoC
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 -----END CERTIFICATE-----

test/certs/badalt7-key.pem

 -----BEGIN PRIVATE KEY-----
-MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDUrQclq+9LtgOP
-Tjvi2LtIr0D/rgbtp9xOkaBGH/qKf/iRd3JcHzEAhqokoEMTiTB5HLuICQ7nUSwk
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-uK51JiJiscIHPSrszi6SwMw/Wr1qTxh7ZArCxbIsPxCWH1HXgl3O7c/VoV2czpP3
-3yznK6KzAgMBAAECggEADjQ0Kv7tr3fLixGljEP/Vh5mT+02hz7TxueQ9b4DBKcB
-We3JVH+8zRUxXdraP/7EnwIdQDuipC5WrWb3mC4VI64h8hZ8Z1gQyEAC83XfC1RF
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-GSu0UXqBVn1Q+u6CUAkh5jA9fpyM5sp9+t5FuwjO+ITHfiNFoD/LCeMUfYVDF7O2
-uCLTsN+7gTGpKMnfL/rg9exrsfDdsmbQe4BhrUFBsYfKgBlBraL0QGD+25qgU8CS
-CQ6toGCCAQKBgQDCYJskwRoObPXW4AsAN1qnaRtTkjrY2O6SaGSiV7bhByMD0WiF
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-J7xiMrNRS4xscifTeHgxfbh5dgsfw8bsQwaxvPpSl5ytCfWWXqOs+K2wWQKBgBM4
-Mher8PNQg7FgcILExJipRgyI7zID4ZwNTK/nW86KrZstHx9k2IRslraUkdGnhMM3
-t671HRsEVhn+h/bUhulp3nzDGZffEH+odocW8QvpYWcYtdha/xQi18mltgC//Q3x
-s+m0yqtnJzONt57p3d99M1x9d2BaFXf9A6B68BQBAoGBAOatu9+wGaIEB//fpaQt
-mnsS2XBJco5gHTjOegCSNe3gQQsB5mhTEekOeMzJ8WLTMVXQVCXx9/8HxKoycbq8
-M/7ScH1iT/wJTkSsjyeycUgH31GPeRvmo9YU2PsW3NN6ZyNpxWJFdcPYHAzZqJeA
-cZtQWiEyaf026DdR8YBYn6tf
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+Iy6n6hCaAYIzuWJ85mGJAEhb8apdmqK7bzmXK3UpAoGBALdOvJfqbF0YlHbdQCVi
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+AKGXEBGMMthAlptC4BcOAEs9cYeWGLAoYk8jpNmXvXjhGqvzhPO2YrX5xy46dVOG
+iiCseyA7Kr8Axt9QhUzoi5f7
 -----END PRIVATE KEY-----

test/certs/badcn1-cert.pem

+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

test/certs/badcn1-key.pem

+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----

test/certs/goodcn1-cert.pem

+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

test/certs/goodcn1-key.pem

+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----

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"
 

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");