net: add DNSSEC tool and CNAME support.

This change adds support for DNSSEC chains with CNAMEs. I.e. it's not
possible to prove records about $domain where $domain is a CNAME.

It also adds a tiny, standalone tool to run the verification code from
the command line.

BUG=none
TEST=net_unittests

http://codereview.chromium.org/3301015/show

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@58986 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 276 insertions, 28 deletions

diff --git a/net/base/dns_util.h b/net/base/dns_util.h
index 78dca47..c91587d 100644
--- a/net/base/dns_util.h
+++ b/net/base/dns_util.h
@@ -29,6 +29,7 @@ std::string TrimEndingDot(const std::string& host);
 // DNS resource record types. See
 // http://www.iana.org/assignments/dns-parameters
 
+static const uint16 kDNS_CNAME = 5;
 static const uint16 kDNS_TXT = 16;
 static const uint16 kDNS_CERT = 37;
 static const uint16 kDNS_DS = 43;
diff --git a/net/base/dnssec_chain_verifier.cc b/net/base/dnssec_chain_verifier.cc
index 711c17e..a32c683 100644
--- a/net/base/dnssec_chain_verifier.cc
+++ b/net/base/dnssec_chain_verifier.cc
@@ -146,6 +146,7 @@ DNSSECChainVerifier::DNSSECChainVerifier(const std::string& target,
       chain_(chain),
       ignore_timestamps_(false),
       valid_(false),
+      already_entered_zone_(false),
       rrtype_(0) {
 }
 
@@ -184,9 +185,13 @@ DNSSECChainVerifier::Error DNSSECChainVerifier::Verify() {
       break;
     }
 
-    err = EnterZone(next_name);
-    if (err != OK)
-      return err;
+    if (already_entered_zone_) {
+      already_entered_zone_ = false;
+    } else {
+      err = EnterZone(next_name);
+      if (err != OK)
+        return err;
+    }
   }
 
   return OK;
@@ -453,6 +458,19 @@ DNSSECChainVerifier::Error DNSSECChainVerifier::EnterZone(
   return OK;
 }
 
+// CountLabels returns the number of DNS labels in |a|, which must be in DNS,
+// length-prefixed form.
+static unsigned CountLabels(base::StringPiece a) {
+  for (unsigned c = 0;; c++) {
+    if (!a.size())
+      return c;
+    uint8 label_len = a.data()[0];
+    a.remove_prefix(1);
+    DCHECK_GE(a.size(), label_len);
+    a.remove_prefix(label_len);
+  }
+}
+
 // LeaveZone transitions out of the current zone, either by following DS
 // records to validate the entry key of the next zone, or because the final
 // resource records are given.
@@ -472,10 +490,11 @@ DNSSECChainVerifier::Error DNSSECChainVerifier::LeaveZone(
 
   if (rrtype == kDNS_DS) {
     err = ReadDSSet(&rrdatas, *next_name);
-  } else if (rrtype == kDNS_CERT) {
-    err = ReadCERTs(&rrdatas);
+  } else if (rrtype == kDNS_CERT || rrtype == kDNS_TXT) {
+    err = ReadGenericRRs(&rrdatas);
+  } else if (rrtype == kDNS_CNAME) {
+    err = ReadCNAME(&rrdatas);
   } else {
-    // TODO(agl): add CNAME support.
     return UNKNOWN_TERMINAL_RRTYPE;
   }
   if (err != OK)
@@ -491,7 +510,7 @@ DNSSECChainVerifier::Error DNSSECChainVerifier::LeaveZone(
     // 'closer' to the target than the current zone.
     if (MatchingLabels(target_, *next_name) <= current_zone_->matching_labels)
       return OFF_COURSE;
-  } else if (rrtype == kDNS_CERT) {
+  } else if (rrtype == kDNS_CERT || rrtype == kDNS_TXT) {
     // If this is the final entry in the chain then the name must match target_
     if (next_name->size() != target_.size() ||
         memcmp(next_name->data(), target_.data(), target_.size())) {
@@ -500,6 +519,28 @@ DNSSECChainVerifier::Error DNSSECChainVerifier::LeaveZone(
     rrdatas_ = rrdatas;
     valid_ = true;
     rrtype_ = rrtype;
+  } else if (rrtype == kDNS_CNAME) {
+    // A CNAME must match the current target. Then we update the current target
+    // and unwind the chain to the closest common ancestor.
+    if (next_name->size() != target_.size() ||
+        memcmp(next_name->data(), target_.data(), target_.size())) {
+      return BAD_TARGET;
+    }
+    DCHECK_EQ(1u, rrdatas.size());
+    target_ = rrdatas[0].as_string();
+    // We unwind the zones until the current zone is a (non-strict) subset of
+    // the new target.
+    while (MatchingLabels(target_, current_zone_->name) <
+           CountLabels(current_zone_->name)) {
+      Zone* prev = current_zone_->prev;
+      delete current_zone_;
+      current_zone_ = prev;
+      if (!current_zone_) {
+        NOTREACHED();
+        return BAD_DATA;
+      }
+    }
+    already_entered_zone_ = true;
   } else {
     NOTREACHED();
     return UNKNOWN_TERMINAL_RRTYPE;
@@ -581,14 +622,14 @@ DNSSECChainVerifier::Error DNSSECChainVerifier::ReadDSSet(
   return OK;
 }
 
-DNSSECChainVerifier::Error DNSSECChainVerifier::ReadCERTs(
+DNSSECChainVerifier::Error DNSSECChainVerifier::ReadGenericRRs(
     std::vector<base::StringPiece>* rrdatas) {
-  uint8 num_certs;
-  if (!U8(&num_certs))
+  uint8 num_rrs;
+  if (!U8(&num_rrs))
     return BAD_DATA;
-  rrdatas->resize(num_certs);
+  rrdatas->resize(num_rrs);
 
-  for (unsigned i = 0; i < num_certs; i++) {
+  for (unsigned i = 0; i < num_rrs; i++) {
     base::StringPiece rrdata;
     if (!VariableLength16(&rrdata))
       return BAD_DATA;
@@ -598,6 +639,17 @@ DNSSECChainVerifier::Error DNSSECChainVerifier::ReadCERTs(
   return OK;
 }
 
+DNSSECChainVerifier::Error DNSSECChainVerifier::ReadCNAME(
+    std::vector<base::StringPiece>* rrdatas) {
+  base::StringPiece name;
+  if (!ReadName(&name))
+    return BAD_DATA;
+
+  rrdatas->resize(1);
+  (*rrdatas)[0] = name;
+  return OK;
+}
+
 // static
 std::map<std::string, std::string>
 DNSSECChainVerifier::ParseTLSTXTRecord(base::StringPiece rrdata) {
@@ -687,19 +739,6 @@ DNSSECChainVerifier::ParseTLSTXTRecord(base::StringPiece rrdata) {
   return ret;
 }
 
-// CountLabels returns the number of DNS labels in |a|, which must be in DNS,
-// length-prefixed form.
-static unsigned CountLabels(base::StringPiece a) {
-  for (unsigned c = 0;; c++) {
-    if (!a.size())
-      return c;
-    uint8 label_len = a.data()[0];
-    a.remove_prefix(1);
-    DCHECK_GE(a.size(), label_len);
-    a.remove_prefix(label_len);
-  }
-}
-
 // RemoveLeadingLabel removes the first label from |a|, which must be in DNS,
 // length-prefixed form.
 static void RemoveLeadingLabel(base::StringPiece* a) {
diff --git a/net/base/dnssec_chain_verifier.h b/net/base/dnssec_chain_verifier.h
index 096dea1..d896c6c 100644
--- a/net/base/dnssec_chain_verifier.h
+++ b/net/base/dnssec_chain_verifier.h
@@ -96,14 +96,17 @@ class DNSSECChainVerifier {
   Error LeaveZone(base::StringPiece* next_name);
   Error ReadDSSet(std::vector<base::StringPiece>*,
                   const base::StringPiece& next_name);
-  Error ReadCERTs(std::vector<base::StringPiece>*);
-
+  Error ReadGenericRRs(std::vector<base::StringPiece>*);
+  Error ReadCNAME(std::vector<base::StringPiece>*);
 
   Zone* current_zone_;
-  const std::string target_;
+  std::string target_;
   base::StringPiece chain_;
   bool ignore_timestamps_;
   bool valid_;
+  // already_entered_zone_ is set to true when we unwind a Zone chain and start
+  // off from a point where we have already entered a zone.
+  bool already_entered_zone_;
   uint16 rrtype_;
   std::vector<base::StringPiece> rrdatas_;
   // A list of pointers which need to be free()ed on destruction.
diff --git a/net/base/dnssec_unittest.cc b/net/base/dnssec_unittest.cc
index 4181e09..f95c771 100644
--- a/net/base/dnssec_unittest.cc
+++ b/net/base/dnssec_unittest.cc
@@ -359,6 +359,202 @@ static const unsigned char kChain[] = {
   0xeb, 0xdd, 0xe5, 0xc7, 0x1d, 0x16, 0xa2, 0x45, 0x1c,
 };
 
+// kCNAMEChain is a chain which proves that www.dnssec-exp.org is a CNAME to
+// dnssec-exp.org and then proves a TXT record on dnssec-exp.org.
+static const unsigned char kCNAMEChain[] = {
+  0x4a, 0x5c, 0x01, 0x01, 0x10, 0x08, 0x00, 0x00, 0x01, 0x51, 0x80, 0x4c, 0x8e,
+  0xba, 0xff, 0x4c, 0x7a, 0xf4, 0x80, 0x4a, 0x5c, 0x6d, 0xe6, 0xa7, 0xaa, 0x97,
+  0xca, 0x48, 0x4a, 0x49, 0xbb, 0xff, 0x91, 0x1a, 0xd8, 0xc2, 0x55, 0x0d, 0x80,
+  0x1c, 0x83, 0x41, 0x2b, 0x89, 0x70, 0x87, 0xd9, 0x3a, 0x23, 0x9f, 0xdc, 0xa4,
+  0xb6, 0x0c, 0xe3, 0x3a, 0x5a, 0xbe, 0xfc, 0x2b, 0xcb, 0xb7, 0x14, 0xbd, 0xbf,
+  0x43, 0xaa, 0x03, 0x34, 0xe8, 0x84, 0x18, 0x2e, 0x95, 0x0e, 0x77, 0xb1, 0xe2,
+  0x74, 0x86, 0xd8, 0xc3, 0x9c, 0xdc, 0x00, 0x80, 0x8c, 0x92, 0xfc, 0x92, 0xfe,
+  0x25, 0xe3, 0x6d, 0x94, 0xe5, 0xc4, 0x08, 0x18, 0xf7, 0xc2, 0x96, 0xde, 0x8c,
+  0x85, 0x73, 0x22, 0x0d, 0x03, 0x7a, 0xe0, 0xa9, 0x51, 0x27, 0x24, 0xbc, 0xf8,
+  0xbf, 0x63, 0x52, 0xef, 0xbd, 0xb8, 0x07, 0xe8, 0xf6, 0xaa, 0x3d, 0x02, 0x28,
+  0xfe, 0x44, 0xd4, 0xe4, 0x04, 0x10, 0x61, 0x95, 0x6c, 0x87, 0x06, 0x2a, 0x5c,
+  0xdb, 0x67, 0x0d, 0xac, 0x1a, 0x02, 0x2e, 0x66, 0x35, 0x08, 0x28, 0x29, 0x24,
+  0x8e, 0xad, 0x4c, 0x3b, 0x6a, 0x99, 0x88, 0xd6, 0x32, 0xa6, 0x7d, 0xc3, 0x0c,
+  0x3d, 0xbc, 0x0b, 0xff, 0x86, 0x8d, 0xc6, 0x50, 0x8b, 0xad, 0x1f, 0x1f, 0xf7,
+  0x06, 0xc5, 0x9e, 0x0c, 0x6f, 0xbb, 0x3c, 0x02, 0x5c, 0x67, 0xa7, 0xaf, 0x53,
+  0x63, 0x5a, 0xae, 0x99, 0x47, 0x93, 0x61, 0xc8, 0x4f, 0xfb, 0x03, 0xec, 0xfe,
+  0xa3, 0xc1, 0xee, 0x45, 0xf8, 0x56, 0x73, 0x88, 0xf4, 0x14, 0x6d, 0x96, 0x7c,
+  0xdc, 0x88, 0x01, 0x99, 0x04, 0x18, 0x3d, 0x42, 0x56, 0x57, 0x54, 0xd7, 0xed,
+  0xf8, 0x6b, 0x46, 0xff, 0x01, 0xe6, 0x1a, 0x75, 0x37, 0xd4, 0xf6, 0xb2, 0x57,
+  0x61, 0x6b, 0xbf, 0x24, 0x99, 0x6d, 0xcd, 0x63, 0xc6, 0x45, 0xd0, 0x0a, 0x93,
+  0x5c, 0xbb, 0xd3, 0x36, 0xac, 0xfa, 0x57, 0x51, 0xa0, 0xcf, 0x32, 0x0e, 0xb3,
+  0x57, 0xf3, 0x02, 0x77, 0x02, 0x00, 0x88, 0x01, 0x00, 0x03, 0x08, 0x03, 0x01,
+  0x00, 0x01, 0xbd, 0x60, 0x70, 0x38, 0x41, 0x94, 0x7f, 0xfd, 0x32, 0x58, 0x14,
+  0xc5, 0x2d, 0x22, 0x93, 0x67, 0x70, 0x63, 0xf2, 0x62, 0x04, 0x8a, 0x55, 0xf8,
+  0x48, 0x4a, 0x65, 0x5e, 0xcb, 0x71, 0xcc, 0x4d, 0x73, 0xa4, 0x25, 0x8f, 0x8e,
+  0xbb, 0x42, 0x31, 0xd0, 0xdc, 0x58, 0x26, 0xda, 0x2d, 0x8b, 0x13, 0xdc, 0x3a,
+  0x2e, 0xa3, 0xc5, 0x0d, 0x29, 0xe0, 0xe6, 0xa5, 0x6a, 0xd4, 0xe6, 0x05, 0xc9,
+  0x30, 0x6d, 0xdc, 0x34, 0x29, 0xa6, 0xa0, 0xe7, 0x00, 0xfa, 0xe2, 0x4f, 0x05,
+  0xb9, 0xa8, 0x84, 0x0d, 0x0c, 0xd1, 0x6f, 0xdf, 0x8c, 0xa8, 0xeb, 0x7b, 0x00,
+  0x74, 0x17, 0x94, 0xe0, 0x6f, 0x6d, 0xbf, 0xb7, 0x73, 0x4f, 0x9b, 0x0f, 0xc8,
+  0x08, 0x26, 0x56, 0x1e, 0x47, 0x0c, 0x27, 0xbe, 0xe9, 0x73, 0x36, 0xf8, 0x87,
+  0xa5, 0xd7, 0xe9, 0x14, 0x28, 0x27, 0xa5, 0xf0, 0x87, 0x32, 0xd7, 0xd8, 0x51,
+  0x00, 0x00, 0x03, 0x6f, 0x72, 0x67, 0x00, 0x00, 0x2b, 0x00, 0x90, 0x08, 0x01,
+  0x00, 0x02, 0xa3, 0x00, 0x4c, 0x90, 0x0c, 0x80, 0x4c, 0x86, 0xc3, 0xf0, 0xa1,
+  0x20, 0x10, 0x1a, 0xab, 0x3c, 0x50, 0xae, 0x3f, 0x7f, 0x49, 0x4a, 0x3f, 0xfc,
+  0xf1, 0xfb, 0x5c, 0x63, 0x76, 0x7f, 0x60, 0xf8, 0x0e, 0x08, 0x30, 0x23, 0xb1,
+  0xe7, 0xa9, 0xbc, 0x23, 0xa4, 0x1a, 0xaf, 0xc5, 0x99, 0x3e, 0x85, 0x1f, 0x0b,
+  0xf3, 0x7f, 0x04, 0x12, 0x5b, 0x7e, 0x26, 0xb1, 0x87, 0xa0, 0x4c, 0xd9, 0xaf,
+  0xf0, 0x30, 0xeb, 0x88, 0xb0, 0xf6, 0x88, 0xb5, 0x10, 0xb7, 0xc9, 0xa8, 0xc8,
+  0xc0, 0xc0, 0x26, 0x69, 0x16, 0x90, 0xec, 0xec, 0x53, 0xf2, 0xc4, 0x24, 0x7c,
+  0x24, 0xc0, 0x67, 0x09, 0x29, 0x4b, 0xcc, 0x80, 0x92, 0xe5, 0xd9, 0xc4, 0xa3,
+  0x18, 0x0b, 0x16, 0x65, 0xc2, 0x11, 0x7a, 0x3b, 0xb1, 0xc0, 0xaf, 0x0b, 0x93,
+  0xe6, 0x7b, 0x76, 0x25, 0x18, 0x7a, 0x1e, 0x8e, 0x4f, 0x50, 0xf2, 0xb4, 0xda,
+  0x72, 0x72, 0x44, 0x3a, 0x18, 0xf9, 0xed, 0x72, 0x05, 0x19, 0x77, 0x34, 0x02,
+  0x01, 0x00, 0x00, 0x02, 0x00, 0x00, 0x02, 0x01, 0x10, 0x07, 0x01, 0x00, 0x00,
+  0x03, 0x84, 0x4c, 0x90, 0xea, 0x0d, 0x4c, 0x7e, 0x66, 0xfd, 0x53, 0x76, 0x37,
+  0x11, 0x28, 0x49, 0x49, 0xa9, 0xaa, 0x7e, 0xe7, 0xc6, 0x2b, 0x0f, 0x0e, 0x76,
+  0xb7, 0xa6, 0x15, 0x4d, 0xcf, 0x95, 0x9e, 0x5b, 0x25, 0x5a, 0x52, 0xcc, 0x62,
+  0xd7, 0x31, 0x2b, 0x6a, 0x35, 0xf7, 0x9f, 0x5b, 0xc1, 0x5e, 0xba, 0xc1, 0x53,
+  0x98, 0x3e, 0xc8, 0x6c, 0x21, 0x6f, 0xf1, 0x93, 0xb6, 0xb7, 0x6e, 0x65, 0x04,
+  0x30, 0xe2, 0x0c, 0x6d, 0xa5, 0xdd, 0x15, 0xd4, 0x01, 0xb8, 0xd3, 0x9b, 0xd2,
+  0x86, 0x38, 0x24, 0x6f, 0xed, 0x03, 0x47, 0xb4, 0x9e, 0x0b, 0x1a, 0xe3, 0x16,
+  0x7d, 0x20, 0x68, 0x50, 0xe5, 0xb1, 0x2c, 0xae, 0x14, 0xc0, 0xdc, 0x09, 0x31,
+  0x6d, 0xa0, 0x4e, 0x55, 0xdc, 0x65, 0xbe, 0xe5, 0x89, 0xe4, 0x35, 0x57, 0x3e,
+  0x2b, 0xda, 0x06, 0x8d, 0xef, 0xc8, 0xdf, 0xf9, 0xf6, 0xc3, 0x09, 0x39, 0xc7,
+  0x83, 0xe9, 0xe0, 0xf0, 0x2e, 0xad, 0x21, 0x56, 0x8b, 0x60, 0xf9, 0x84, 0x53,
+  0xac, 0x1e, 0x84, 0x42, 0x7a, 0xfa, 0xa1, 0xbd, 0x86, 0x61, 0x12, 0xd0, 0x70,
+  0xdc, 0x54, 0x50, 0x0e, 0xbe, 0x1a, 0x47, 0xe4, 0x38, 0x96, 0xb4, 0xe7, 0x3c,
+  0x26, 0xae, 0x1d, 0x7e, 0x37, 0x28, 0xf5, 0x54, 0xe6, 0x94, 0x63, 0x30, 0x42,
+  0x7e, 0x52, 0xb2, 0x8b, 0xda, 0x96, 0x44, 0x0c, 0xa4, 0xda, 0x33, 0x28, 0x77,
+  0x02, 0xdf, 0xcf, 0xa0, 0xc7, 0x14, 0x2b, 0x68, 0xbb, 0x5d, 0x1b, 0x7e, 0x32,
+  0x5c, 0xf2, 0x0e, 0xcb, 0x1b, 0xe1, 0x6d, 0x1c, 0xb8, 0x96, 0xbf, 0x0d, 0x1a,
+  0xcc, 0x0f, 0x2f, 0xfd, 0x25, 0xff, 0x33, 0x3d, 0x89, 0x6d, 0x27, 0x9e, 0xe0,
+  0xb9, 0x5a, 0x72, 0xbb, 0x2f, 0xe5, 0x95, 0xbb, 0x40, 0xb6, 0x4c, 0x11, 0x6c,
+  0x80, 0xb6, 0x9e, 0xa9, 0xd9, 0x31, 0x61, 0xb9, 0x69, 0x9c, 0xf2, 0xe8, 0xc5,
+  0xa0, 0xfd, 0x07, 0x59, 0x87, 0x38, 0xff, 0x25, 0x04, 0x00, 0x88, 0x01, 0x00,
+  0x03, 0x07, 0x03, 0x01, 0x00, 0x01, 0x80, 0x97, 0x87, 0xf6, 0x40, 0x06, 0x2f,
+  0x24, 0x88, 0x92, 0x03, 0x5d, 0x89, 0xb2, 0x52, 0x51, 0xf3, 0x0b, 0x40, 0x87,
+  0x78, 0x1c, 0xea, 0x72, 0x9c, 0x99, 0x00, 0x88, 0xc2, 0xed, 0xd2, 0xb5, 0xc2,
+  0x44, 0x58, 0x55, 0xc5, 0x2f, 0x22, 0x5a, 0x53, 0x3a, 0x99, 0xce, 0x55, 0x57,
+  0xdc, 0x0b, 0x73, 0xf2, 0xf5, 0x48, 0xbf, 0xc7, 0x8e, 0x6a, 0x29, 0xbd, 0x0b,
+  0xca, 0xdb, 0xca, 0xed, 0x66, 0x00, 0x7b, 0x75, 0xb2, 0x38, 0xec, 0x24, 0xe6,
+  0x49, 0x70, 0x22, 0xa4, 0x42, 0xff, 0x4a, 0x78, 0x96, 0xe6, 0x9f, 0x6d, 0xdd,
+  0xb2, 0x85, 0x13, 0x05, 0xee, 0xab, 0x8e, 0x05, 0x5a, 0x98, 0xac, 0xba, 0x07,
+  0xc2, 0xff, 0x22, 0xf4, 0xba, 0xd5, 0xfa, 0xbf, 0x1d, 0x84, 0x1e, 0xeb, 0x5e,
+  0xff, 0xe5, 0x91, 0x34, 0x88, 0xea, 0x61, 0x19, 0xb2, 0x0e, 0x6b, 0x0d, 0xf7,
+  0x9e, 0xf1, 0x8c, 0xb5, 0x00, 0x88, 0x01, 0x00, 0x03, 0x07, 0x03, 0x01, 0x00,
+  0x01, 0xc9, 0x06, 0x00, 0x53, 0x45, 0x4a, 0x0b, 0xb8, 0xe2, 0xb0, 0x4e, 0x29,
+  0xc8, 0x19, 0xb4, 0xa3, 0x63, 0x27, 0xe2, 0xcd, 0xc7, 0xc7, 0x6d, 0x60, 0x31,
+  0xeb, 0xc0, 0x82, 0x5f, 0x44, 0x14, 0x96, 0x60, 0x4e, 0xc8, 0x62, 0xf4, 0xcc,
+  0xb9, 0x99, 0x7a, 0x19, 0xf0, 0xaf, 0x34, 0xd9, 0x63, 0xca, 0x40, 0xe3, 0x7b,
+  0xb6, 0xbc, 0xfa, 0x40, 0x08, 0x1d, 0xe7, 0xc3, 0xa4, 0xd2, 0x73, 0x3a, 0x32,
+  0xf2, 0xa4, 0x4c, 0x3c, 0x4f, 0xd6, 0x52, 0x52, 0xc8, 0x6d, 0xa5, 0xf6, 0xd9,
+  0x4d, 0x0c, 0xfd, 0xb4, 0x93, 0x8b, 0x61, 0x72, 0xdb, 0x6e, 0x5f, 0x2d, 0xd9,
+  0x2d, 0xab, 0x18, 0x2f, 0x87, 0x2d, 0xbf, 0x8d, 0x42, 0x37, 0x93, 0x41, 0x18,
+  0xf6, 0x93, 0x97, 0xda, 0x27, 0x31, 0xdc, 0xda, 0xec, 0x21, 0x16, 0x61, 0xe1,
+  0xe0, 0x7a, 0x53, 0x26, 0x82, 0xc7, 0x62, 0x99, 0x18, 0x81, 0x6a, 0x65, 0x01,
+  0x08, 0x01, 0x01, 0x03, 0x07, 0x03, 0x01, 0x00, 0x01, 0x8a, 0x58, 0x7e, 0x3d,
+  0xda, 0x69, 0x1c, 0xf3, 0x93, 0x15, 0x90, 0xa8, 0xc7, 0x65, 0xed, 0x81, 0x31,
+  0x63, 0xcd, 0x4d, 0x75, 0x84, 0xaf, 0xfa, 0xa6, 0xb2, 0xb9, 0x90, 0xe8, 0x76,
+  0x76, 0x7d, 0x20, 0xc8, 0x74, 0x6f, 0x03, 0x1c, 0x61, 0xa5, 0x54, 0x77, 0x33,
+  0x40, 0x6d, 0x57, 0x89, 0xf2, 0x07, 0x7a, 0x8e, 0xad, 0x6c, 0x47, 0x75, 0x6f,
+  0x3f, 0xf4, 0x91, 0xdf, 0xa9, 0xa6, 0x1a, 0xcb, 0x1b, 0x57, 0x85, 0x1d, 0x97,
+  0x93, 0x91, 0x0e, 0xda, 0xa2, 0x64, 0xfd, 0x93, 0x0c, 0xd0, 0xc7, 0xc4, 0x49,
+  0xca, 0x29, 0x35, 0xfe, 0x8d, 0x67, 0xf2, 0xb5, 0x97, 0x93, 0xed, 0xdd, 0xc0,
+  0x6d, 0x2c, 0xc1, 0x28, 0x2d, 0x2f, 0xee, 0xe6, 0x6b, 0x33, 0xa3, 0x36, 0x7a,
+  0x82, 0x67, 0x97, 0xa8, 0x9d, 0xeb, 0xaa, 0xc4, 0x52, 0x64, 0x02, 0xda, 0x9f,
+  0x43, 0xae, 0xb0, 0xe0, 0xf4, 0x5e, 0xad, 0x5c, 0x2f, 0x42, 0x0f, 0xfc, 0xc2,
+  0xef, 0xfc, 0xbe, 0x04, 0xd3, 0x69, 0x88, 0xe7, 0x67, 0x33, 0x90, 0xd7, 0x93,
+  0xb1, 0xe1, 0x66, 0x6e, 0xeb, 0x6b, 0xd1, 0x3b, 0x96, 0xd2, 0xf5, 0xde, 0x1d,
+  0xa6, 0xc7, 0xb9, 0x04, 0x81, 0x4f, 0x1e, 0xea, 0x7a, 0x49, 0x94, 0x2a, 0x17,
+  0x8e, 0xb6, 0x88, 0x06, 0x05, 0x03, 0xb6, 0x16, 0x2c, 0xe3, 0xc5, 0xbf, 0xb1,
+  0xd4, 0xc3, 0x2e, 0xee, 0xcd, 0xe7, 0xda, 0xe3, 0x08, 0x6f, 0x9b, 0xa6, 0x29,
+  0x7e, 0x73, 0xca, 0x19, 0xf5, 0xfe, 0xcd, 0x47, 0x7a, 0xa6, 0x49, 0x3a, 0x53,
+  0x3f, 0x59, 0xbc, 0xe9, 0x1a, 0x94, 0x42, 0x75, 0x44, 0xae, 0x27, 0xeb, 0x1f,
+  0xc2, 0xa3, 0x0e, 0xa2, 0xfe, 0xdf, 0x0c, 0xd4, 0x74, 0x5e, 0x40, 0x0a, 0x46,
+  0x30, 0xb7, 0x55, 0xe1, 0x3d, 0x53, 0xd4, 0xfb, 0x04, 0x88, 0x97, 0x36, 0xda,
+  0x01, 0x03, 0x78, 0xf4, 0xf5, 0x01, 0x08, 0x01, 0x01, 0x03, 0x07, 0x03, 0x01,
+  0x00, 0x01, 0x94, 0xe3, 0x6c, 0x83, 0xb9, 0x90, 0x8a, 0x71, 0x59, 0x4b, 0x72,
+  0x5d, 0xcf, 0x1a, 0xbe, 0xc2, 0xb2, 0x1c, 0x82, 0x19, 0xf8, 0xb8, 0xc2, 0xd8,
+  0x3b, 0xfc, 0x9d, 0xa3, 0xbe, 0x4f, 0x3e, 0x97, 0xd9, 0xfa, 0xb3, 0x0c, 0x2d,
+  0x5b, 0x76, 0xae, 0xc7, 0x95, 0x9c, 0x2d, 0x91, 0xaa, 0x93, 0x90, 0xc5, 0x55,
+  0x27, 0xef, 0x20, 0x13, 0xd1, 0x48, 0xad, 0xe1, 0x89, 0xe1, 0xcf, 0x06, 0xd4,
+  0x67, 0x5b, 0x8d, 0x08, 0x1b, 0x3f, 0x53, 0xb2, 0x60, 0x81, 0xbb, 0x38, 0x74,
+  0xdc, 0xe2, 0x1b, 0xf9, 0x4f, 0x63, 0x65, 0xc9, 0x6a, 0xfa, 0x93, 0xa4, 0x05,
+  0xcf, 0xdf, 0x10, 0xe3, 0x3c, 0x05, 0x20, 0x64, 0xc5, 0x56, 0xfc, 0x01, 0x86,
+  0x6a, 0xcc, 0x0d, 0x8b, 0x0e, 0x4e, 0xd5, 0xda, 0x90, 0xae, 0x90, 0xc0, 0x7a,
+  0x2f, 0x03, 0x5f, 0xbc, 0xdc, 0x1b, 0x14, 0x00, 0x2c, 0x65, 0x89, 0xda, 0x70,
+  0x07, 0x48, 0x50, 0x69, 0xc6, 0xc3, 0xeb, 0x1f, 0x88, 0xd9, 0x10, 0x83, 0xcd,
+  0x8b, 0x93, 0xce, 0x3e, 0xb8, 0x26, 0xfd, 0x3f, 0xf5, 0x7b, 0x17, 0xe8, 0x06,
+  0x15, 0xdd, 0xe6, 0xdc, 0x82, 0x7e, 0x21, 0x2f, 0x58, 0xc8, 0x47, 0x67, 0x89,
+  0x63, 0x25, 0xe5, 0xac, 0x0a, 0x16, 0xc5, 0xdc, 0xf1, 0x71, 0x6f, 0xff, 0xe7,
+  0x27, 0x8b, 0xe5, 0x15, 0x56, 0xba, 0x14, 0x71, 0x7a, 0x39, 0xa7, 0x49, 0x59,
+  0xc2, 0xbb, 0x19, 0x1f, 0x4b, 0x80, 0x10, 0xe3, 0xce, 0x4a, 0x1f, 0x6b, 0x69,
+  0x75, 0xb5, 0x9c, 0x0a, 0x8a, 0x4b, 0x25, 0x9b, 0x3a, 0xb7, 0x0f, 0x2a, 0xde,
+  0x35, 0x9c, 0xa5, 0x31, 0xb3, 0x76, 0x1f, 0xef, 0xdf, 0x17, 0x58, 0x7c, 0xda,
+  0x50, 0x35, 0xc3, 0xc8, 0x98, 0x59, 0x71, 0x02, 0xe9, 0xf7, 0x06, 0xd3, 0x91,
+  0x3c, 0x0d, 0xab, 0xf2, 0xd8, 0xba, 0x30, 0xda, 0x09, 0x10, 0x75, 0x0a, 0x64,
+  0x6e, 0x73, 0x73, 0x65, 0x63, 0x2d, 0x65, 0x78, 0x70, 0x03, 0x6f, 0x72, 0x67,
+  0x00, 0x00, 0x2b, 0x00, 0x90, 0x07, 0x02, 0x00, 0x01, 0x51, 0x80, 0x4c, 0x90,
+  0xea, 0x0d, 0x4c, 0x7e, 0x66, 0xfd, 0x93, 0xb4, 0x39, 0xee, 0x27, 0x29, 0x54,
+  0x9e, 0x57, 0x41, 0x12, 0x60, 0x19, 0xf6, 0x3f, 0xa6, 0xba, 0xd6, 0x41, 0x98,
+  0x57, 0xec, 0x30, 0x9e, 0x96, 0x08, 0x8c, 0x13, 0xa9, 0x76, 0x95, 0x74, 0xcd,
+  0xcd, 0x2e, 0xa6, 0x22, 0x21, 0x44, 0x3f, 0x13, 0xdf, 0x7a, 0x33, 0xf1, 0x8c,
+  0x4c, 0xf9, 0xa3, 0x6d, 0x50, 0x38, 0xfa, 0x71, 0x7b, 0x7a, 0xfe, 0x54, 0xa9,
+  0x44, 0x81, 0x8c, 0xd5, 0x04, 0x9e, 0x46, 0x89, 0xda, 0x26, 0x43, 0x40, 0xf6,
+  0xd7, 0x23, 0x48, 0x07, 0x0e, 0x48, 0x2e, 0x19, 0x0d, 0x41, 0x27, 0x85, 0x75,
+  0x1e, 0xa0, 0xa9, 0xad, 0x39, 0xaf, 0x8d, 0xc1, 0xed, 0xc5, 0x93, 0x73, 0x05,
+  0x09, 0x7a, 0x8f, 0xf0, 0x97, 0xc3, 0x98, 0xab, 0xcc, 0x7c, 0xbf, 0x48, 0xef,
+  0xea, 0x34, 0xf3, 0xe6, 0x5d, 0x8d, 0x1b, 0xbe, 0x43, 0x97, 0x56, 0x4e, 0x60,
+  0x9f, 0xdd, 0x1b, 0xf5, 0x15, 0x6c, 0x01, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x01, 0x00, 0xa8, 0x01, 0x00, 0x03, 0x05, 0x03, 0x01, 0x00, 0x01, 0xd0, 0x0a,
+  0x64, 0x8e, 0xb5, 0x90, 0x0b, 0x75, 0xc2, 0xeb, 0x52, 0x5f, 0xa4, 0xcb, 0xeb,
+  0x1d, 0x77, 0x8d, 0x84, 0x2c, 0xef, 0xb6, 0x88, 0xd4, 0x7c, 0x50, 0x4c, 0x52,
+  0x7b, 0x9d, 0x37, 0x31, 0x36, 0xb2, 0x5b, 0x6c, 0x47, 0xb4, 0x21, 0x80, 0x61,
+  0x46, 0xfa, 0x5b, 0x44, 0x50, 0x91, 0x9d, 0xf8, 0xc1, 0x78, 0x00, 0x78, 0x29,
+  0xfe, 0xe2, 0x08, 0x65, 0xf8, 0xc9, 0xdf, 0x69, 0x0b, 0x59, 0x6b, 0xf4, 0x93,
+  0x9f, 0x8b, 0x25, 0x0b, 0x6b, 0x93, 0x12, 0x06, 0x57, 0xc8, 0x04, 0x9d, 0x3f,
+  0x33, 0xbd, 0x2b, 0x35, 0x54, 0xb9, 0x98, 0x75, 0xe4, 0xb0, 0x49, 0x3c, 0x29,
+  0xc1, 0xfb, 0x74, 0xbc, 0x91, 0x82, 0x9e, 0xc5, 0x61, 0xa6, 0x16, 0xe1, 0xf0,
+  0x8f, 0xe9, 0xe1, 0x23, 0x55, 0x5e, 0xfb, 0xf1, 0xcc, 0x8a, 0x75, 0x5d, 0xf2,
+  0x86, 0x89, 0x0a, 0x29, 0xcb, 0xca, 0x33, 0xde, 0x9d, 0x74, 0x43, 0x0d, 0xde,
+  0x67, 0xde, 0x71, 0x0f, 0x7f, 0xa3, 0xbb, 0x22, 0x82, 0x81, 0x66, 0xd1, 0xbd,
+  0x49, 0x0d, 0x89, 0x45, 0xd7, 0x18, 0xcf, 0x98, 0x2c, 0x19, 0xaf, 0x63, 0x16,
+  0x20, 0x91, 0x03, 0x77, 0x77, 0x77, 0x0a, 0x64, 0x6e, 0x73, 0x73, 0x65, 0x63,
+  0x2d, 0x65, 0x78, 0x70, 0x03, 0x6f, 0x72, 0x67, 0x00, 0x00, 0x05, 0x00, 0xb0,
+  0x05, 0x03, 0x00, 0x00, 0x00, 0x3c, 0x4c, 0xae, 0xeb, 0xfc, 0x4c, 0x87, 0x59,
+  0xf6, 0x83, 0x7f, 0x01, 0x90, 0xde, 0x40, 0xa3, 0x42, 0x73, 0x59, 0xb7, 0xc7,
+  0x3a, 0xe1, 0x01, 0xae, 0x5c, 0x0f, 0xd4, 0x22, 0x9d, 0xb5, 0x88, 0xb8, 0xbb,
+  0x14, 0x95, 0x7f, 0xfa, 0xa7, 0xff, 0x48, 0x30, 0x90, 0x4c, 0x1b, 0x71, 0x33,
+  0x1c, 0x36, 0xbc, 0xaf, 0xae, 0x1d, 0x97, 0xec, 0xee, 0x71, 0xb8, 0xb1, 0x2a,
+  0x19, 0xd7, 0xf3, 0x25, 0x78, 0x94, 0x59, 0x54, 0xbb, 0x2b, 0xac, 0xe6, 0x3c,
+  0x3e, 0x7e, 0x43, 0x7c, 0x2d, 0xc0, 0x72, 0x58, 0xe8, 0x4a, 0xa2, 0xed, 0x1f,
+  0x39, 0x5f, 0x6a, 0x98, 0x62, 0xd0, 0xfc, 0x6e, 0xbe, 0x01, 0x1f, 0xa0, 0x39,
+  0xf2, 0xb4, 0x4d, 0x33, 0x9b, 0x4d, 0xe3, 0x81, 0x65, 0x77, 0x80, 0x3d, 0x2c,
+  0x44, 0xee, 0x1a, 0x65, 0xf7, 0x25, 0x68, 0x95, 0x3f, 0xa1, 0x22, 0xd5, 0x9d,
+  0x59, 0x7e, 0xa7, 0xa6, 0xf2, 0x7e, 0x4d, 0x47, 0x8b, 0x98, 0x4a, 0x0d, 0x16,
+  0xa1, 0x78, 0x12, 0xc7, 0x90, 0xe2, 0xe9, 0x6d, 0xe6, 0x89, 0xf3, 0xa1, 0xc4,
+  0x30, 0xbd, 0xe8, 0xf9, 0x75, 0xc6, 0x49, 0x9e, 0x5f, 0x9c, 0x1e, 0x23, 0xb5,
+  0x0e, 0x82, 0x70, 0x8e, 0xb3, 0x0d, 0x1c, 0x0a, 0x64, 0x6e, 0x73, 0x73, 0x65,
+  0x63, 0x2d, 0x65, 0x78, 0x70, 0x03, 0x6f, 0x72, 0x67, 0x00, 0x0a, 0x64, 0x6e,
+  0x73, 0x73, 0x65, 0x63, 0x2d, 0x65, 0x78, 0x70, 0x03, 0x6f, 0x72, 0x67, 0x00,
+  0x00, 0x10, 0x00, 0xb0, 0x05, 0x02, 0x00, 0x00, 0x00, 0x3c, 0x4c, 0xae, 0xf6,
+  0xe5, 0x4c, 0x87, 0x5e, 0xd9, 0x83, 0x7f, 0x2a, 0x88, 0x85, 0xb8, 0xf1, 0x73,
+  0x93, 0xe3, 0x85, 0xee, 0xc8, 0x93, 0x34, 0x2d, 0xd2, 0x47, 0x2d, 0x86, 0xe5,
+  0xc6, 0x18, 0x69, 0x94, 0x94, 0x7a, 0x2d, 0x7e, 0xa2, 0x57, 0xf1, 0x75, 0x3e,
+  0x51, 0xbf, 0xaa, 0xed, 0xdd, 0xf8, 0x1a, 0xb9, 0x1e, 0x86, 0x6f, 0x7f, 0xe9,
+  0xdc, 0xad, 0x83, 0xda, 0x7d, 0xcd, 0x2d, 0x4d, 0x9b, 0xe3, 0x66, 0x92, 0xb9,
+  0x21, 0x96, 0xbf, 0xea, 0x70, 0x55, 0xbf, 0xb3, 0xb0, 0x85, 0x90, 0x72, 0x5f,
+  0x09, 0xd1, 0x7c, 0x49, 0x25, 0x07, 0x79, 0x34, 0x48, 0xe7, 0x1c, 0xaa, 0x53,
+  0x33, 0xcb, 0x62, 0xb9, 0x9f, 0x42, 0x6e, 0x36, 0x00, 0x31, 0xab, 0x9f, 0xcc,
+  0xf5, 0xa9, 0x02, 0x2f, 0x75, 0x4c, 0xf1, 0xd6, 0x86, 0x3a, 0x7f, 0x08, 0xe4,
+  0x72, 0x7d, 0x34, 0xe0, 0x40, 0x76, 0xd1, 0xf0, 0xe3, 0x98, 0x37, 0xe7, 0x93,
+  0x94, 0x57, 0x95, 0x6c, 0xde, 0x9e, 0x17, 0x57, 0x3a, 0x78, 0xe9, 0x8b, 0x57,
+  0x7f, 0x74, 0xe2, 0xaf, 0xf8, 0xaf, 0x11, 0x64, 0xa9, 0xe9, 0xdb, 0xb2, 0x58,
+  0xda, 0x7c, 0xfe, 0x3f, 0x52, 0x06, 0x39, 0xfc, 0xdd, 0x1c, 0x1c, 0x01, 0x00,
+  0x3a, 0x39, 0x76, 0x3d, 0x74, 0x6c, 0x73, 0x31, 0x20, 0x68, 0x61, 0x3d, 0x73,
+  0x68, 0x61, 0x31, 0x20, 0x68, 0x3d, 0x31, 0x30, 0x39, 0x63, 0x38, 0x31, 0x34,
+  0x36, 0x33, 0x30, 0x34, 0x64, 0x65, 0x37, 0x63, 0x34, 0x63, 0x38, 0x37, 0x30,
+  0x35, 0x62, 0x63, 0x63, 0x31, 0x64, 0x38, 0x61, 0x32, 0x63, 0x32, 0x33, 0x37,
+  0x66, 0x30, 0x35, 0x35, 0x38, 0x64, 0x37,
+};
+
 TEST(DNSSECChainVerifierTest, TestChain) {
   base::StringPiece chain(reinterpret_cast<const char*>(kChain),
                           sizeof(kChain));
@@ -384,6 +580,15 @@ TEST(DNSSECChainVerifierTest, BadTarget) {
   ASSERT_EQ(net::DNSSECChainVerifier::BAD_TARGET, verifier.Verify());
 }
 
+TEST(DNSSECChainVerifierTest, TestCNAMEChain) {
+  base::StringPiece chain(reinterpret_cast<const char*>(kCNAMEChain),
+                          sizeof(kCNAMEChain));
+  net::DNSSECChainVerifier verifier(FromDNSName("www.dnssec-exp.org"), chain);
+  verifier.IgnoreTimestamps();
+  ASSERT_EQ(net::DNSSECChainVerifier::OK, verifier.Verify());
+  ASSERT_EQ(net::kDNS_TXT, verifier.rrtype());
+}
+
 // This is too slow to run all the time.
 TEST(DNSSECChainVerifierTest, DISABLED_Fuzz) {
   uint8 copy[sizeof(kChain)];