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>

15 files changed, 379 insertions, 209 deletions

diff --git a/crypto/asn1/a_strex.c b/crypto/asn1/a_strex.c
index 6a67bc8c33..ea4dd1c5b1 100644
--- a/crypto/asn1/a_strex.c
+++ b/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;
-}
diff --git a/crypto/include/internal/asn1_int.h b/crypto/include/internal/asn1_int.h
index fdd5f1e648..962c3c6302 100644
--- a/crypto/include/internal/asn1_int.h
+++ b/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);
diff --git a/crypto/x509v3/v3_ncons.c b/crypto/x509v3/v3_ncons.c
index 1f1996b68e..77edcd4dfb 100644
--- a/crypto/x509v3/v3_ncons.c
+++ b/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;
 }
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-----
-MIIDlTCCAn2gAwIBAgIBAjANBgkqhkiG9w0BAQsFADAXMRUwEwYDVQQDDAxUZXN0
-IE5DIENBIDEwIBcNMTYwNzA5MTQ0ODExWhgPMjExNjA3MTAxNDQ4MTFaMGgxIzAh
-BgNVBAoMGkdvb2QgTkMgVGVzdCBDZXJ0aWZpY2F0ZSAxMRUwEwYDVQQDDAx3d3cu
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-P68GDKI++WoUgM8LDfxS0KOL7A9cqcpM2L27hjyEgnqIBPHFfm9fxztBotuCTl5L
-vRlTFVjv65nn
+MIIDgTCCAmmgAwIBAgIBAjANBgkqhkiG9w0BAQsFADAXMRUwEwYDVQQDDAxUZXN0
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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
-2t27+5tYyW21+2wvcO5OE38YlOVy/5txITf/xFASUqGpsurxQuqMv+owPF5qbZVa
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+Aofm4Oj2DwX8W+81oO71/RXSfEFUjdOw0H6iRDyvWa1gqftj2/aWjV7Ifdo49thx
+EzX/9GdsRInifN6FfOfo/A==
 -----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-----
-MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDKz8F/ndKz0vuv
-BymjTUjtrWSQsnsuisR+oW8CIliNBi8yqqeNrtoa2s+e2GBC7gxDlK9IOqGo4Ulu
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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-----
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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
-Tjvi2LtIr0D/rgbtp9xOkaBGH/qKf/iRd3JcHzEAhqokoEMTiTB5HLuICQ7nUSwk
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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-----
+MIIEvwIBADANBgkqhkiG9w0BAQEFAASCBKkwggSlAgEAAoIBAQDN9WI6OyxnW+R9
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+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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+u7nhn7s=
+-----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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+YMTtYZN77nb+yY4oE6XEugQ=
+-----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/