From b40f05a835ecd5ff30e7f87a89837eee059bfadc Mon Sep 17 00:00:00 2001 From: "agl@chromium.org" Date: Thu, 9 Sep 2010 20:13:23 +0000 Subject: 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 --- net/base/dns_util.h | 1 + net/base/dnssec_chain_verifier.cc | 89 ++++++++++++----- net/base/dnssec_chain_verifier.h | 9 +- net/base/dnssec_unittest.cc | 205 ++++++++++++++++++++++++++++++++++++++ 4 files changed, 276 insertions(+), 28 deletions(-) (limited to 'net/base') 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* 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* rrdatas) { + base::StringPiece name; + if (!ReadName(&name)) + return BAD_DATA; + + rrdatas->resize(1); + (*rrdatas)[0] = name; + return OK; +} + // static std::map 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*, const base::StringPiece& next_name); - Error ReadCERTs(std::vector*); - + Error ReadGenericRRs(std::vector*); + Error ReadCNAME(std::vector*); 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 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, 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chain(reinterpret_cast(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(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)]; -- cgit v1.1