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DNSSEC support in Bro
This commit is contained in:
fatema
parent
e055f9b36b
commit
ff5c11975d
18 changed files with 1096 additions and 7 deletions
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@ -3544,6 +3544,66 @@ type dns_tsig_additional: record {
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is_query: count; ##< TODO.
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is_query: count; ##< TODO.
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};
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};
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## A DNSSEC RRSIG record.
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##
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## .. bro:see:: dns_RRSIG_addl
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type dns_rrsig_additional: record {
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query: string; ##< Query.
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answer_type: count; ##< Ans type.
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type_covered: count; ## qtype covered by RRSIG RR.
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algorithm: count; ##< Algorithm.
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labels: count; ##< labels in the owner's name.
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orig_ttl: interval; ##< original TTL
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sig_exp: time; ##< Time when signed RR expires.
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sig_incep: time; ##< Time when signed.
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key_tag: count; ## key tag value
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signer_name: string; ##< Signature.
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signature: string; ##< Hash of the RRDATA
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is_query: count; ##< The RR is a query/Response.
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};
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## A DNSSEC DNSKEY record.
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##
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## .. bro:see:: dns_DNSKEY_addl
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type dns_dnskey_additional: record {
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query: string; ##< Query.
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answer_type: count; ##< Ans type.
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flags: count; ##< flags filed.
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protocol: count; ##< Protocol, should be always 3 for DNSSEC.
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algorithm: count; ##< Algorithm for Public Key.
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public_key: string; ##< Public Key
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is_query: count; ##< The RR is a query/Response.
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};
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## A DNSSEC NSEC3 record.
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##
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## .. bro:see:: dns_NSEC3_addl
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type dns_nsec3_additional: record {
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query: string; ##< Query.
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answer_type: count; ##< Ans type.
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nsec_flags: count; ##< flags field.
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nsec_hash_algo: count; ##< Hash algorithm.
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nsec_iter: count; ##< Iterations.
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nsec_salt_len: count; ##< salt length.
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nsec_salt: string; ##< Salt value
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nsec_hlen: count; ##< Hash length.
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nsec_hash: string; ##< Hash value.
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is_query: count; ##< The RR is a query/Response.
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};
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## A DNSSEC DS record.
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##
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## .. bro:see:: dns_DS_addl
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type dns_ds_additional: record {
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query: string; ##< Query.
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answer_type: count; ##< Ans type.
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key_tag: count; ##< flags filed.
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algorithm: count; ##< Algorithm for Public Key.
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digest_type: count; ##< Digest Type.
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digest_val: string; ##< Digest Value.
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is_query: count; ##< The RR is a query/Response.
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};
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# DNS answer types.
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# DNS answer types.
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#
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#
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# .. bro:see:: dns_answerr
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# .. bro:see:: dns_answerr
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@ -76,4 +76,34 @@ export {
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[254] = "C_NONE",
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[254] = "C_NONE",
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[255] = "C_ANY",
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[255] = "C_ANY",
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} &default = function(n: count): string { return fmt("qclass-%d", n); };
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} &default = function(n: count): string { return fmt("qclass-%d", n); };
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## Possible values of the algorithms used in DNSKEY, DS and RRSIG records
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const algorithms = {
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[0] = "reserved0",
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[1] = "RSA_MD5",
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[2] = "Diffie_Hellman",
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[3] = "DSA_SHA1",
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[4] = "Elliptic_Curve",
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[5] = "RSA_SHA1",
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[6] = "DSA_NSEC3_SHA1",
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[7] = "RSA_SHA1_NSEC3_SHA1",
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[8] = "RSA_SHA256",
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[10] = "RSA_SHA512",
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[12] = "GOST_R_34_10_2001",
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[13] = "ECDSA_curveP256withSHA256",
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[14] = "ECDSA_curveP384withSHA384",
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[252] = "Indirect",
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[253] = "PrivateDNS",
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[254] = "PrivateOID",
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[255] = "reserved255",
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} &default = function(n: count): string { return fmt("algorithm-%d", n); };
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const digests = {
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[0] = "reserved0",
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[1] = "SHA1",
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[2] = "SHA256",
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[3] = "GOST_R_34_11_94",
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[4] = "SHA384",
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} &default = function(n: count): string { return fmt("digest-%d", n); };
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}
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}
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@ -466,6 +466,45 @@ event dns_SRV_reply(c: connection, msg: dns_msg, ans: dns_answer, target: string
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#
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#
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# }
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# }
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event dns_RRSIG_addl(c: connection, msg: dns_msg, ans: dns_answer, rrsig: dns_rrsig_additional)
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{
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local rrsig_rec: string = fmt("RRSIG_Signer_%s", rrsig$signer_name);
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if ( rrsig$signer_name == "")
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rrsig_rec = fmt("RRSIG_Signer_<Root>");
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hook DNS::do_reply(c, msg, ans, rrsig_rec);
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}
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event dns_DNSKEY_addl(c: connection, msg: dns_msg, ans: dns_answer, dnskey: dns_dnskey_additional)
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{
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local dnskey_rec: string = fmt("DNSKEY_for_%s", ans$query);
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if (ans$query == "")
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dnskey_rec = fmt("DNSKEY_for_<Root>");
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hook DNS::do_reply(c, msg, ans, dnskey_rec);
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}
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event dns_NSEC_addl(c: connection, msg: dns_msg, ans: dns_answer, next_name: string, bitmaps: string_vec)
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{
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hook DNS::do_reply(c, msg, ans, next_name);
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}
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event dns_NSEC3_addl(c: connection, msg: dns_msg, ans: dns_answer, nsec3: dns_nsec3_additional, bitmaps: string_vec)
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{
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local nsec3_rec: string = fmt("NSEC3_for_%s", ans$query);
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if (ans$query == "")
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nsec3_rec = fmt("NSEC3_for_<Root>");
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hook DNS::do_reply(c, msg, ans, nsec3_rec);
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}
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event dns_DS_addl(c: connection, msg: dns_msg, ans: dns_answer, ds: dns_ds_additional)
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{
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local ds_rec: string = fmt("DS_for_%s", ans$query);
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if (ans$query == "")
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ds_rec = fmt("DS_for_<Root>");
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hook DNS::do_reply(c, msg, ans, ds_rec);
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}
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event dns_rejected(c: connection, msg: dns_msg, query: string, qtype: count, qclass: count) &priority=5
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event dns_rejected(c: connection, msg: dns_msg, query: string, qtype: count, qclass: count) &priority=5
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{
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{
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if ( c?$dns )
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if ( c?$dns )
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42
scripts/policy/protocols/dns/addl-dnskey.bro
Normal file
42
scripts/policy/protocols/dns/addl-dnskey.bro
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@ -0,0 +1,42 @@
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##! This script adds additional fields for the DNSKEY dns response of current
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##! query to the DNS log. It can cause severe overhead.
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@load base/protocols/dns/main
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@load base/protocols/dns/consts
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redef dns_skip_all_auth = F;
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redef dns_skip_all_addl = F;
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module DNS;
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export {
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redef record Info += {
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dnskey_flags: vector of count &log &optional;
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dnskey_algo: vector of string &log &optional;
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dnskey_proto: vector of count &log &optional;
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dnskey_pubkey: vector of string &log &optional;
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};
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}
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event dns_DNSKEY_addl(c: connection, msg: dns_msg, ans: dns_answer, dnskey: dns_dnskey_additional)
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{
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if ( c?$dns )
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{
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if ( ! c$dns?$dnskey_flags )
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c$dns$dnskey_flags = vector();
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c$dns$dnskey_flags[|c$dns$dnskey_flags|] = dnskey$flags;
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if ( ! c$dns?$dnskey_algo )
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c$dns$dnskey_algo = vector();
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c$dns$dnskey_algo[|c$dns$dnskey_algo|] = DNS::algorithms[dnskey$algorithm];
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if ( ! c$dns?$dnskey_proto )
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c$dns$dnskey_proto = vector();
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c$dns$dnskey_proto[|c$dns$dnskey_proto|] = dnskey$protocol;
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if ( ! c$dns?$dnskey_pubkey)
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c$dns$dnskey_pubkey = vector();
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c$dns$dnskey_pubkey[|c$dns$dnskey_pubkey|] = bytestring_to_hexstr(dnskey$public_key);
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}
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}
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42
scripts/policy/protocols/dns/addl-ds.bro
Normal file
42
scripts/policy/protocols/dns/addl-ds.bro
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@ -0,0 +1,42 @@
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##! This script adds additional fields for the DS dns response of current
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##! query to the DNS log. It can cause severe overhead.
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@load base/protocols/dns/main
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@load base/protocols/dns/consts
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redef dns_skip_all_auth = F;
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redef dns_skip_all_addl = F;
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module DNS;
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export {
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redef record Info += {
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ds_key_tag: vector of count &log &optional;
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ds_algo: vector of string &log &optional;
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ds_digestType: vector of string &log &optional;
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ds_digest: vector of string &log &optional;
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};
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}
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event dns_DS_addl(c: connection, msg: dns_msg, ans: dns_answer, ds: dns_ds_additional)
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{
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if ( c?$dns )
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{
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if ( ! c$dns?$ds_key_tag )
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c$dns$ds_key_tag = vector();
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c$dns$ds_key_tag[|c$dns$ds_key_tag|] = ds$key_tag;
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if ( ! c$dns?$ds_algo )
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c$dns$ds_algo = vector();
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c$dns$ds_algo[|c$dns$ds_algo|] = DNS::algorithms[ds$algorithm];
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if ( ! c$dns?$ds_digestType )
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c$dns$ds_digestType = vector();
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c$dns$ds_digestType[|c$dns$ds_digestType|] = DNS::digests[ds$digest_type];
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if ( ! c$dns?$ds_digest)
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c$dns$ds_digest = vector();
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c$dns$ds_digest[|c$dns$ds_digest|] = bytestring_to_hexstr(ds$digest_val);
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}
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}
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76
scripts/policy/protocols/dns/addl-nsec3.bro
Normal file
76
scripts/policy/protocols/dns/addl-nsec3.bro
Normal file
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@ -0,0 +1,76 @@
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##! This script adds additional fields for the NSEC3 dns response of current
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##! query to the DNS log. It can cause severe overhead.
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@load base/protocols/dns/main
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@load base/protocols/dns/consts
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redef dns_skip_all_auth = F;
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redef dns_skip_all_addl = F;
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module DNS;
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export {
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redef record Info += {
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nsec_flags: vector of count &log &optional;
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nsec_hash_algo: vector of count &log &optional;
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nsec_iter: vector of count &log &optional;
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nsec_salt_len: vector of count &log &optional;
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nsec_salt: vector of string &log &optional;
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nsec_hlen: vector of count &log &optional;
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nsec_hash: vector of string &log &optional;
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nsec_bitmaps: vector of string &log &optional;
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};
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}
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event dns_NSEC3_addl(c: connection, msg: dns_msg, ans: dns_answer, nsec3: dns_nsec3_additional, bitmaps: string_vec)
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{
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if ( c?$dns )
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{
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if ( ! c$dns?$nsec_flags )
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c$dns$nsec_flags = vector();
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c$dns$nsec_flags[|c$dns$nsec_flags|] = nsec3$nsec_flags;
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if ( ! c$dns?$nsec_hash_algo )
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c$dns$nsec_hash_algo = vector();
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c$dns$nsec_hash_algo[|c$dns$nsec_hash_algo|] = nsec3$nsec_hash_algo;
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if ( ! c$dns?$nsec_iter )
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c$dns$nsec_iter = vector();
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c$dns$nsec_iter[|c$dns$nsec_iter|] = nsec3$nsec_iter;
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if ( ! c$dns?$nsec_salt_len)
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c$dns$nsec_salt_len = vector();
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c$dns$nsec_salt_len[|c$dns$nsec_salt_len|] = nsec3$nsec_salt_len;
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if ( ! c$dns?$nsec_salt)
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c$dns$nsec_salt = vector();
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c$dns$nsec_salt[|c$dns$nsec_salt|] = bytestring_to_hexstr(nsec3$nsec_salt);
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if ( ! c$dns?$nsec_hlen)
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c$dns$nsec_hlen = vector();
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c$dns$nsec_hlen[|c$dns$nsec_hlen|] = nsec3$nsec_hlen;
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if ( ! c$dns?$nsec_hash)
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c$dns$nsec_hash = vector();
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c$dns$nsec_hash[|c$dns$nsec_hash|] = bytestring_to_hexstr(nsec3$nsec_hash);
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if ( ! c$dns?$nsec_bitmaps)
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c$dns$nsec_bitmaps = vector();
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if ( |bitmaps| != 0)
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{
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local bitmap_strings: string = "";
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for ( i in bitmaps )
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{
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if ( i > 0 )
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bitmap_strings += " ";
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bitmap_strings += fmt("bitmap %d %s", |bitmaps[i]|, bitmaps[i]);
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}
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c$dns$nsec_bitmaps[|c$dns$nsec_bitmaps|] = bitmap_strings;
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}
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}
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}
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64
scripts/policy/protocols/dns/addl-rrsig.bro
Normal file
64
scripts/policy/protocols/dns/addl-rrsig.bro
Normal file
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@ -0,0 +1,64 @@
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##! This script adds additional fields corresponding to the RRSIG record responses for the current
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##! query to the DNS log. It can cause severe overhead.
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@load base/protocols/dns/main
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@load base/protocols/dns/consts
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module DNS;
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export {
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redef record Info += {
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rrsig_type_covered: vector of string &log &optional;
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rrsig_orig_ttl: vector of interval &log &optional;
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rrsig_key_tag: vector of count &log &optional;
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rrsig_algo: vector of string &log &optional;
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rrsig_labels: vector of count &log &optional;
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rrsig_signer_name: vector of string &log &optional;
|
||||||
|
rrsig_signature: vector of string &log &optional;
|
||||||
|
rrsig_sig_exp: vector of time &log &optional;
|
||||||
|
rrsig_sig_inc: vector of time &log &optional;
|
||||||
|
};
|
||||||
|
}
|
||||||
|
|
||||||
|
event dns_RRSIG_addl(c: connection, msg: dns_msg, ans: dns_answer, rrsig: dns_rrsig_additional)
|
||||||
|
{
|
||||||
|
if ( c?$dns )
|
||||||
|
{
|
||||||
|
if ( ! c$dns?$rrsig_type_covered )
|
||||||
|
c$dns$rrsig_type_covered = vector();
|
||||||
|
c$dns$rrsig_type_covered[|c$dns$rrsig_type_covered|] = DNS::query_types[rrsig$type_covered];
|
||||||
|
|
||||||
|
if ( ! c$dns?$rrsig_orig_ttl )
|
||||||
|
c$dns$rrsig_orig_ttl = vector();
|
||||||
|
c$dns$rrsig_orig_ttl[|c$dns$rrsig_orig_ttl|] = rrsig$orig_ttl;
|
||||||
|
|
||||||
|
if ( ! c$dns?$rrsig_key_tag )
|
||||||
|
c$dns$rrsig_key_tag = vector();
|
||||||
|
c$dns$rrsig_key_tag[|c$dns$rrsig_key_tag|] = rrsig$key_tag;
|
||||||
|
|
||||||
|
if ( ! c$dns?$rrsig_algo )
|
||||||
|
c$dns$rrsig_algo = vector();
|
||||||
|
c$dns$rrsig_algo[|c$dns$rrsig_algo|] = DNS::algorithms[rrsig$algorithm];
|
||||||
|
|
||||||
|
if ( ! c$dns?$rrsig_labels )
|
||||||
|
c$dns$rrsig_labels = vector();
|
||||||
|
c$dns$rrsig_labels[|c$dns$rrsig_labels|] = rrsig$labels;
|
||||||
|
|
||||||
|
if ( ! c$dns?$rrsig_signer_name )
|
||||||
|
c$dns$rrsig_signer_name = vector();
|
||||||
|
c$dns$rrsig_signer_name[|c$dns$rrsig_signer_name|] = rrsig$signer_name;
|
||||||
|
|
||||||
|
if ( ! c$dns?$rrsig_signature )
|
||||||
|
c$dns$rrsig_signature = vector();
|
||||||
|
c$dns$rrsig_signature[|c$dns$rrsig_signature|] = bytestring_to_hexstr(rrsig$signature);
|
||||||
|
|
||||||
|
if ( ! c$dns?$rrsig_sig_exp )
|
||||||
|
c$dns$rrsig_sig_exp = vector();
|
||||||
|
c$dns$rrsig_sig_exp[|c$dns$rrsig_sig_exp|] = rrsig$sig_exp;
|
||||||
|
|
||||||
|
if ( ! c$dns?$rrsig_sig_inc )
|
||||||
|
c$dns$rrsig_sig_inc = vector();
|
||||||
|
c$dns$rrsig_sig_inc[|c$dns$rrsig_sig_inc|] = rrsig$sig_incep;
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
|
@ -115,6 +115,10 @@ RecordType* dns_answer;
|
||||||
RecordType* dns_soa;
|
RecordType* dns_soa;
|
||||||
RecordType* dns_edns_additional;
|
RecordType* dns_edns_additional;
|
||||||
RecordType* dns_tsig_additional;
|
RecordType* dns_tsig_additional;
|
||||||
|
RecordType* dns_rrsig_additional;
|
||||||
|
RecordType* dns_dnskey_additional;
|
||||||
|
RecordType* dns_nsec3_additional;
|
||||||
|
RecordType* dns_ds_additional;
|
||||||
TableVal* dns_skip_auth;
|
TableVal* dns_skip_auth;
|
||||||
TableVal* dns_skip_addl;
|
TableVal* dns_skip_addl;
|
||||||
int dns_skip_all_auth;
|
int dns_skip_all_auth;
|
||||||
|
|
@ -430,7 +434,14 @@ void init_net_var()
|
||||||
internal_type("dns_edns_additional")->AsRecordType();
|
internal_type("dns_edns_additional")->AsRecordType();
|
||||||
dns_tsig_additional =
|
dns_tsig_additional =
|
||||||
internal_type("dns_tsig_additional")->AsRecordType();
|
internal_type("dns_tsig_additional")->AsRecordType();
|
||||||
|
dns_rrsig_additional =
|
||||||
|
internal_type("dns_rrsig_additional")->AsRecordType();
|
||||||
|
dns_dnskey_additional =
|
||||||
|
internal_type("dns_dnskey_additional")->AsRecordType();
|
||||||
|
dns_nsec3_additional =
|
||||||
|
internal_type("dns_nsec3_additional")->AsRecordType();
|
||||||
|
dns_ds_additional =
|
||||||
|
internal_type("dns_ds_additional")->AsRecordType();
|
||||||
dns_skip_auth = internal_val("dns_skip_auth")->AsTableVal();
|
dns_skip_auth = internal_val("dns_skip_auth")->AsTableVal();
|
||||||
dns_skip_addl = internal_val("dns_skip_addl")->AsTableVal();
|
dns_skip_addl = internal_val("dns_skip_addl")->AsTableVal();
|
||||||
dns_skip_all_auth = opt_internal_int("dns_skip_all_auth");
|
dns_skip_all_auth = opt_internal_int("dns_skip_all_auth");
|
||||||
|
|
|
||||||
|
|
@ -118,6 +118,10 @@ extern RecordType* dns_answer;
|
||||||
extern RecordType* dns_soa;
|
extern RecordType* dns_soa;
|
||||||
extern RecordType* dns_edns_additional;
|
extern RecordType* dns_edns_additional;
|
||||||
extern RecordType* dns_tsig_additional;
|
extern RecordType* dns_tsig_additional;
|
||||||
|
extern RecordType* dns_rrsig_additional;
|
||||||
|
extern RecordType* dns_dnskey_additional;
|
||||||
|
extern RecordType* dns_nsec3_additional;
|
||||||
|
extern RecordType* dns_ds_additional;
|
||||||
extern TableVal* dns_skip_auth;
|
extern TableVal* dns_skip_auth;
|
||||||
extern TableVal* dns_skip_addl;
|
extern TableVal* dns_skip_addl;
|
||||||
extern int dns_skip_all_auth;
|
extern int dns_skip_all_auth;
|
||||||
|
|
|
||||||
|
|
@ -312,6 +312,26 @@ int DNS_Interpreter::ParseAnswer(DNS_MsgInfo* msg,
|
||||||
status = ParseRR_TSIG(msg, data, len, rdlength, msg_start);
|
status = ParseRR_TSIG(msg, data, len, rdlength, msg_start);
|
||||||
break;
|
break;
|
||||||
|
|
||||||
|
case TYPE_RRSIG:
|
||||||
|
status = ParseRR_RRSIG(msg, data, len, rdlength, msg_start);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case TYPE_DNSKEY:
|
||||||
|
status = ParseRR_DNSKEY(msg, data, len, rdlength, msg_start);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case TYPE_NSEC:
|
||||||
|
status = ParseRR_NSEC(msg, data, len, rdlength, msg_start);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case TYPE_NSEC3:
|
||||||
|
status = ParseRR_NSEC3(msg, data, len, rdlength, msg_start);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case TYPE_DS:
|
||||||
|
status = ParseRR_DS(msg, data, len, rdlength, msg_start);
|
||||||
|
break;
|
||||||
|
|
||||||
default:
|
default:
|
||||||
|
|
||||||
if ( dns_unknown_reply && ! msg->skip_event )
|
if ( dns_unknown_reply && ! msg->skip_event )
|
||||||
|
|
@ -724,6 +744,20 @@ void DNS_Interpreter::ExtractOctets(const u_char*& data, int& len,
|
||||||
len -= dlen;
|
len -= dlen;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
void DNS_Interpreter::ExtractStream(const u_char*& data, int& len,
|
||||||
|
BroString** p, int siglen)
|
||||||
|
{
|
||||||
|
|
||||||
|
int dlen = min(len, siglen); // Len in bytes of the algorithm use
|
||||||
|
|
||||||
|
if ( p )
|
||||||
|
*p = new BroString(data, dlen, 0);
|
||||||
|
|
||||||
|
data += dlen;
|
||||||
|
len -= dlen;
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
int DNS_Interpreter::ParseRR_TSIG(DNS_MsgInfo* msg,
|
int DNS_Interpreter::ParseRR_TSIG(DNS_MsgInfo* msg,
|
||||||
const u_char*& data, int& len, int rdlength,
|
const u_char*& data, int& len, int rdlength,
|
||||||
const u_char* msg_start)
|
const u_char* msg_start)
|
||||||
|
|
@ -769,6 +803,418 @@ int DNS_Interpreter::ParseRR_TSIG(DNS_MsgInfo* msg,
|
||||||
return 1;
|
return 1;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
int DNS_Interpreter::ParseRR_RRSIG(DNS_MsgInfo* msg,
|
||||||
|
const u_char*& data, int& len, int rdlength,
|
||||||
|
const u_char* msg_start)
|
||||||
|
{
|
||||||
|
|
||||||
|
unsigned int type_covered = ExtractShort(data, len);
|
||||||
|
// split the two bytes for algo and labels extraction
|
||||||
|
uint32 algo_lab = ExtractShort(data, len);
|
||||||
|
unsigned int algo = (algo_lab >> 8) & 0xff;
|
||||||
|
unsigned int lab = algo_lab & 0xff;
|
||||||
|
|
||||||
|
uint32 orig_ttl = ExtractLong(data, len);
|
||||||
|
uint32 sign_exp = ExtractLong(data, len);
|
||||||
|
uint32 sign_incp = ExtractLong(data, len);
|
||||||
|
unsigned int key_tag = ExtractShort(data, len);
|
||||||
|
|
||||||
|
//implement signer's name with the msg_start offset
|
||||||
|
const u_char* data_start = data;
|
||||||
|
u_char name[513];
|
||||||
|
int name_len = sizeof(name) - 1;
|
||||||
|
|
||||||
|
u_char* name_end = ExtractName(data, len, name, name_len, msg_start);
|
||||||
|
if ( ! name_end )
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
int sig_len = rdlength - ((data - data_start) + 18);
|
||||||
|
DNSSEC_Algo dsa = DNSSEC_Algo(algo);
|
||||||
|
BroString* sign;
|
||||||
|
|
||||||
|
switch ( dsa ) {
|
||||||
|
|
||||||
|
case RSA_MD5:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
analyzer->Weird("DNSSEC_RRSIG_NotRecommended_ZoneSignAlgo", fmt("%d", algo));
|
||||||
|
break;
|
||||||
|
|
||||||
|
case Diffie_Hellman:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case DSA_SHA1:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case Elliptic_Curve:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case RSA_SHA1:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case DSA_NSEC3_SHA1:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case RSA_SHA1_NSEC3_SHA1:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case RSA_SHA256:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case RSA_SHA512:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case GOST_R_34_10_2001:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case ECDSA_curveP256withSHA256:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case ECDSA_curveP384withSHA384:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case Indirect:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
analyzer->Weird("DNSSEC_RRSIG_Indirect_ZoneSignAlgo", fmt("%d", algo));
|
||||||
|
break;
|
||||||
|
|
||||||
|
case PrivateDNS:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
analyzer->Weird("DNSSEC_RRSIG_PrivateDNS_ZoneSignAlgo", fmt("%d", algo));
|
||||||
|
break;
|
||||||
|
|
||||||
|
case PrivateOID:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
analyzer->Weird("DNSSEC_RRSIG_PrivateOID_ZoneSignAlgo", fmt("%d", algo));
|
||||||
|
break;
|
||||||
|
|
||||||
|
default:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
analyzer->Weird("DNSSEC_RRSIG_unknown_ZoneSignAlgo", fmt("%d", algo));
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
msg->rrsig = new RRSIG_DATA;
|
||||||
|
msg->rrsig->type_covered = type_covered;
|
||||||
|
msg->rrsig->orig_ttl = orig_ttl;
|
||||||
|
msg->rrsig->sig_exp = sign_exp;
|
||||||
|
msg->rrsig->sig_incep = sign_incp;
|
||||||
|
msg->rrsig->key_tag = key_tag;
|
||||||
|
msg->rrsig->algorithm = algo;
|
||||||
|
msg->rrsig->labels = lab;
|
||||||
|
msg->rrsig->signer_name = new BroString(name, name_end - name, 1);
|
||||||
|
msg->rrsig->signature = sign;
|
||||||
|
|
||||||
|
val_list* vl = new val_list;
|
||||||
|
|
||||||
|
vl->append(analyzer->BuildConnVal());
|
||||||
|
vl->append(msg->BuildHdrVal());
|
||||||
|
vl->append(msg->BuildAnswerVal());
|
||||||
|
vl->append(msg->BuildRRSIG_Val());
|
||||||
|
|
||||||
|
analyzer->ConnectionEvent(dns_RRSIG_addl, vl);
|
||||||
|
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
int DNS_Interpreter::ParseRR_DNSKEY(DNS_MsgInfo* msg,
|
||||||
|
const u_char*& data, int& len, int rdlength,
|
||||||
|
const u_char* msg_start)
|
||||||
|
{
|
||||||
|
|
||||||
|
unsigned int dflags = ExtractShort(data, len);
|
||||||
|
// split the two bytes for protocol and algorithm extraction
|
||||||
|
uint32 proto_algo = ExtractShort(data, len);
|
||||||
|
unsigned int dprotocol = (proto_algo >> 8) & 0xff;
|
||||||
|
unsigned int dalgorithm = proto_algo & 0xff;
|
||||||
|
|
||||||
|
if (dflags != 256 and dflags != 257 and dflags != 0)
|
||||||
|
analyzer->Weird("DNSSEC_DNSKEY_Invalid_Flag", fmt("%d", dflags));
|
||||||
|
|
||||||
|
if ( dprotocol != 3 )
|
||||||
|
analyzer->Weird("DNSSEC_DNSKEY_Invalid_Protocol", fmt("%d", dprotocol));
|
||||||
|
|
||||||
|
//Evaluating the size of remaining bytes for Public Key
|
||||||
|
int sig_len = rdlength - 4;
|
||||||
|
DNSSEC_Algo dsa = DNSSEC_Algo(dalgorithm);
|
||||||
|
BroString* sign;
|
||||||
|
|
||||||
|
switch ( dsa ) {
|
||||||
|
|
||||||
|
case RSA_MD5:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
analyzer->Weird("DNSSEC_DNSKEY_NotRecommended_ZoneSignAlgo", fmt("%d", dalgorithm));
|
||||||
|
break;
|
||||||
|
|
||||||
|
case Diffie_Hellman:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case DSA_SHA1:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case Elliptic_Curve:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case RSA_SHA1:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case DSA_NSEC3_SHA1:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case RSA_SHA1_NSEC3_SHA1:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case RSA_SHA256:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case RSA_SHA512:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case GOST_R_34_10_2001:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case ECDSA_curveP256withSHA256:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case ECDSA_curveP384withSHA384:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case Indirect:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
analyzer->Weird("DNSSEC_DNSKEY_Indirect_ZoneSignAlgo", fmt("%d", dalgorithm));
|
||||||
|
break;
|
||||||
|
|
||||||
|
case PrivateDNS:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
analyzer->Weird("DNSSEC_DNSKEY_PrivateDNS_ZoneSignAlgo", fmt("%d", dalgorithm));
|
||||||
|
break;
|
||||||
|
|
||||||
|
case PrivateOID:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
analyzer->Weird("DNSSEC_DNSKEY_PrivateOID_ZoneSignAlgo", fmt("%d", dalgorithm));
|
||||||
|
break;
|
||||||
|
|
||||||
|
default:
|
||||||
|
ExtractStream(data, len, &sign, sig_len);
|
||||||
|
analyzer->Weird("DNSSEC_DNSKEY_unknown_ZoneSignAlgo", fmt("%d", dalgorithm));
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
msg->dnskey = new DNSKEY_DATA;
|
||||||
|
msg->dnskey->dflags = dflags;
|
||||||
|
msg->dnskey->dprotocol = dprotocol;
|
||||||
|
msg->dnskey->dalgorithm = dalgorithm;
|
||||||
|
msg->dnskey->public_key = sign;
|
||||||
|
|
||||||
|
val_list* vl = new val_list;
|
||||||
|
|
||||||
|
vl->append(analyzer->BuildConnVal());
|
||||||
|
vl->append(msg->BuildHdrVal());
|
||||||
|
vl->append(msg->BuildAnswerVal());
|
||||||
|
vl->append(msg->BuildDNSKEY_Val());
|
||||||
|
|
||||||
|
analyzer->ConnectionEvent(dns_DNSKEY_addl, vl);
|
||||||
|
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
int DNS_Interpreter::ParseRR_NSEC(DNS_MsgInfo* msg,
|
||||||
|
const u_char*& data, int& len, int rdlength,
|
||||||
|
const u_char* msg_start)
|
||||||
|
{
|
||||||
|
|
||||||
|
const u_char* data_start = data;
|
||||||
|
u_char name[513];
|
||||||
|
int name_len = sizeof(name) - 1;
|
||||||
|
|
||||||
|
u_char* name_end = ExtractName(data, len, name, name_len, msg_start);
|
||||||
|
if ( ! name_end )
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
int typebitmaps_len = rdlength - (data - data_start);
|
||||||
|
|
||||||
|
VectorVal* char_strings = new VectorVal(string_vec);
|
||||||
|
|
||||||
|
while (typebitmaps_len > 0)
|
||||||
|
{
|
||||||
|
BroString* bitmap;
|
||||||
|
uint32 block_bmlen = ExtractShort(data, len);
|
||||||
|
unsigned int win_blck = ( block_bmlen >> 8) & 0xff;
|
||||||
|
unsigned int bmlen = block_bmlen & 0xff;
|
||||||
|
if (bmlen == 0)
|
||||||
|
{
|
||||||
|
analyzer->Weird("DNSSEC_NSEC_bitmapLen0", fmt("%d", win_blck));
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
ExtractStream(data, len, &bitmap, bmlen);
|
||||||
|
|
||||||
|
char_strings->Assign(char_strings->Size(), new StringVal(bitmap));
|
||||||
|
typebitmaps_len = typebitmaps_len - (2 + bmlen);
|
||||||
|
}
|
||||||
|
|
||||||
|
val_list* vl = new val_list;
|
||||||
|
|
||||||
|
vl->append(analyzer->BuildConnVal());
|
||||||
|
vl->append(msg->BuildHdrVal());
|
||||||
|
vl->append(msg->BuildAnswerVal());
|
||||||
|
vl->append(new StringVal(new BroString(name, name_end - name, 1)));
|
||||||
|
vl->append(char_strings);
|
||||||
|
|
||||||
|
analyzer->ConnectionEvent(dns_NSEC_addl, vl);
|
||||||
|
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
int DNS_Interpreter::ParseRR_NSEC3(DNS_MsgInfo* msg,
|
||||||
|
const u_char*& data, int& len, int rdlength,
|
||||||
|
const u_char* msg_start)
|
||||||
|
{
|
||||||
|
const u_char* data_start = data;
|
||||||
|
uint32 halgo_flags = ExtractShort(data, len);
|
||||||
|
unsigned int hash_algo = ( halgo_flags >> 8) & 0xff;
|
||||||
|
unsigned int nsec_flags = halgo_flags & 0xff;
|
||||||
|
unsigned int iter = ExtractShort(data,len);
|
||||||
|
|
||||||
|
uint8 salt_len = data[0];
|
||||||
|
++data;
|
||||||
|
--len;
|
||||||
|
|
||||||
|
BroString* salt_val;
|
||||||
|
ExtractStream(data, len, &salt_val, static_cast<int>(salt_len));
|
||||||
|
|
||||||
|
uint8 hash_len = data[0];
|
||||||
|
++data;
|
||||||
|
--len;
|
||||||
|
|
||||||
|
BroString* hash_val;
|
||||||
|
ExtractStream(data, len, &hash_val, static_cast<int>(hash_len));
|
||||||
|
|
||||||
|
int typebitmaps_len = rdlength - (data - data_start);
|
||||||
|
|
||||||
|
VectorVal* char_strings = new VectorVal(string_vec);
|
||||||
|
|
||||||
|
while (typebitmaps_len > 0)
|
||||||
|
{
|
||||||
|
BroString* bitmap;
|
||||||
|
uint32 block_bmlen = ExtractShort(data, len);
|
||||||
|
unsigned int win_blck = ( block_bmlen >> 8) & 0xff;
|
||||||
|
unsigned int bmlen = block_bmlen & 0xff;
|
||||||
|
if (bmlen == 0)
|
||||||
|
{
|
||||||
|
analyzer->Weird("DNSSEC_NSEC_bitmapLen0", fmt("%d", win_blck));
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
ExtractStream(data, len, &bitmap, bmlen);
|
||||||
|
|
||||||
|
char_strings->Assign(char_strings->Size(), new StringVal(bitmap));
|
||||||
|
typebitmaps_len = typebitmaps_len - (2 + bmlen);
|
||||||
|
}
|
||||||
|
|
||||||
|
msg->nsec3 = new NSEC3_DATA;
|
||||||
|
msg->nsec3->nsec_flags = nsec_flags;
|
||||||
|
msg->nsec3->nsec_hash_algo = hash_algo;
|
||||||
|
msg->nsec3->nsec_iter = iter;
|
||||||
|
msg->nsec3->nsec_salt_len = salt_len;
|
||||||
|
msg->nsec3->nsec_salt = salt_val;
|
||||||
|
msg->nsec3->nsec_hlen = hash_len;
|
||||||
|
msg->nsec3->nsec_hash = hash_val;
|
||||||
|
|
||||||
|
val_list* vl = new val_list;
|
||||||
|
|
||||||
|
vl->append(analyzer->BuildConnVal());
|
||||||
|
vl->append(msg->BuildHdrVal());
|
||||||
|
vl->append(msg->BuildAnswerVal());
|
||||||
|
vl->append(msg->BuildNSEC3_Val());
|
||||||
|
vl->append(char_strings);
|
||||||
|
|
||||||
|
analyzer->ConnectionEvent(dns_NSEC3_addl, vl);
|
||||||
|
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
int DNS_Interpreter::ParseRR_DS(DNS_MsgInfo* msg,
|
||||||
|
const u_char*& data, int& len, int rdlength,
|
||||||
|
const u_char* msg_start)
|
||||||
|
{
|
||||||
|
|
||||||
|
unsigned int ds_key_tag = ExtractShort(data, len);
|
||||||
|
// split the two bytes for algorithm and digest type extraction
|
||||||
|
uint32 ds_algo_dtype = ExtractShort(data, len);
|
||||||
|
unsigned int ds_algo = ( ds_algo_dtype >> 8) & 0xff;
|
||||||
|
unsigned int ds_dtype = ds_algo_dtype & 0xff;
|
||||||
|
|
||||||
|
int digest_len = rdlength - 4;
|
||||||
|
DNSSEC_Digest ds_digest_type = DNSSEC_Digest(ds_dtype);
|
||||||
|
BroString* ds_digest;
|
||||||
|
|
||||||
|
switch ( ds_digest_type ) {
|
||||||
|
|
||||||
|
case SHA1:
|
||||||
|
ExtractStream(data, len, &ds_digest, digest_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case SHA256:
|
||||||
|
ExtractStream(data, len, &ds_digest, digest_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case GOST_R_34_11_94:
|
||||||
|
ExtractStream(data, len, &ds_digest, digest_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case SHA384:
|
||||||
|
ExtractStream(data, len, &ds_digest, digest_len);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case reserved0:
|
||||||
|
ExtractStream(data, len, &ds_digest, digest_len);
|
||||||
|
analyzer->Weird("DNSSEC_DS_ResrevedDigestType", fmt("%d", ds_dtype));
|
||||||
|
break;
|
||||||
|
|
||||||
|
default:
|
||||||
|
ExtractStream(data, len, &ds_digest, digest_len);
|
||||||
|
analyzer->Weird("DNSSEC_DS_unknown_DigestType", fmt("%d", ds_dtype));
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
msg->ds = new DS_DATA;
|
||||||
|
msg->ds->key_tag = ds_key_tag;
|
||||||
|
msg->ds->algorithm = ds_algo;
|
||||||
|
msg->ds->digest_type = ds_dtype;
|
||||||
|
msg->ds->digest_val = ds_digest;
|
||||||
|
|
||||||
|
val_list* vl = new val_list;
|
||||||
|
|
||||||
|
vl->append(analyzer->BuildConnVal());
|
||||||
|
vl->append(msg->BuildHdrVal());
|
||||||
|
vl->append(msg->BuildAnswerVal());
|
||||||
|
vl->append(msg->BuildDS_Val());
|
||||||
|
|
||||||
|
analyzer->ConnectionEvent(dns_DS_addl, vl);
|
||||||
|
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
int DNS_Interpreter::ParseRR_A(DNS_MsgInfo* msg,
|
int DNS_Interpreter::ParseRR_A(DNS_MsgInfo* msg,
|
||||||
const u_char*& data, int& len, int rdlength)
|
const u_char*& data, int& len, int rdlength)
|
||||||
{
|
{
|
||||||
|
|
@ -1003,6 +1449,10 @@ DNS_MsgInfo::DNS_MsgInfo(DNS_RawMsgHdr* hdr, int arg_is_query)
|
||||||
answer_type = DNS_QUESTION;
|
answer_type = DNS_QUESTION;
|
||||||
skip_event = 0;
|
skip_event = 0;
|
||||||
tsig = 0;
|
tsig = 0;
|
||||||
|
rrsig = 0;
|
||||||
|
dnskey = 0;
|
||||||
|
nsec3 = 0;
|
||||||
|
ds = 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
DNS_MsgInfo::~DNS_MsgInfo()
|
DNS_MsgInfo::~DNS_MsgInfo()
|
||||||
|
|
@ -1063,7 +1513,7 @@ Val* DNS_MsgInfo::BuildEDNS_Val()
|
||||||
|
|
||||||
// Need to break the TTL field into three components:
|
// Need to break the TTL field into three components:
|
||||||
// initial: [------------- ttl (32) ---------------------]
|
// initial: [------------- ttl (32) ---------------------]
|
||||||
// after: [DO][ ext rcode (7)][ver # (8)][ Z field (16)]
|
// after: [ ext rcode (8)][ver # (8)][ Z field (16) ]
|
||||||
|
|
||||||
unsigned int ercode = (ttl >> 24) & 0xff;
|
unsigned int ercode = (ttl >> 24) & 0xff;
|
||||||
unsigned int version = (ttl >> 16) & 0xff;
|
unsigned int version = (ttl >> 16) & 0xff;
|
||||||
|
|
@ -1104,6 +1554,90 @@ Val* DNS_MsgInfo::BuildTSIG_Val()
|
||||||
return r;
|
return r;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
Val* DNS_MsgInfo::BuildRRSIG_Val()
|
||||||
|
{
|
||||||
|
RecordVal* r = new RecordVal(dns_rrsig_additional);
|
||||||
|
|
||||||
|
Ref(query_name);
|
||||||
|
r->Assign(0, query_name);
|
||||||
|
r->Assign(1, new Val(int(answer_type), TYPE_COUNT));
|
||||||
|
r->Assign(2, new Val(rrsig->type_covered, TYPE_COUNT));
|
||||||
|
r->Assign(3, new Val(rrsig->algorithm, TYPE_COUNT));
|
||||||
|
r->Assign(4, new Val(rrsig->labels, TYPE_COUNT));
|
||||||
|
r->Assign(5, new IntervalVal(double(rrsig->orig_ttl), Seconds));
|
||||||
|
r->Assign(6, new Val(double(rrsig->sig_exp), TYPE_TIME));
|
||||||
|
r->Assign(7, new Val(double(rrsig->sig_incep), TYPE_TIME));
|
||||||
|
r->Assign(8, new Val(rrsig->key_tag, TYPE_COUNT));
|
||||||
|
r->Assign(9, new StringVal(rrsig->signer_name));
|
||||||
|
r->Assign(10, new StringVal(rrsig->signature));
|
||||||
|
r->Assign(11, new Val(is_query, TYPE_COUNT));
|
||||||
|
|
||||||
|
delete rrsig;
|
||||||
|
rrsig = 0;
|
||||||
|
|
||||||
|
return r;
|
||||||
|
}
|
||||||
|
|
||||||
|
Val* DNS_MsgInfo::BuildDNSKEY_Val()
|
||||||
|
{
|
||||||
|
RecordVal* r = new RecordVal(dns_dnskey_additional);
|
||||||
|
|
||||||
|
Ref(query_name);
|
||||||
|
r->Assign(0, query_name);
|
||||||
|
r->Assign(1, new Val(int(answer_type), TYPE_COUNT));
|
||||||
|
r->Assign(2, new Val(dnskey->dflags, TYPE_COUNT));
|
||||||
|
r->Assign(3, new Val(dnskey->dprotocol, TYPE_COUNT));
|
||||||
|
r->Assign(4, new Val(dnskey->dalgorithm, TYPE_COUNT));
|
||||||
|
r->Assign(5, new StringVal(dnskey->public_key));
|
||||||
|
r->Assign(6, new Val(is_query, TYPE_COUNT));
|
||||||
|
|
||||||
|
delete dnskey;
|
||||||
|
dnskey = 0;
|
||||||
|
|
||||||
|
return r;
|
||||||
|
}
|
||||||
|
|
||||||
|
Val* DNS_MsgInfo::BuildNSEC3_Val()
|
||||||
|
{
|
||||||
|
RecordVal* r = new RecordVal(dns_nsec3_additional);
|
||||||
|
|
||||||
|
Ref(query_name);
|
||||||
|
r->Assign(0, query_name);
|
||||||
|
r->Assign(1, new Val(int(answer_type), TYPE_COUNT));
|
||||||
|
r->Assign(2, new Val(nsec3->nsec_flags, TYPE_COUNT));
|
||||||
|
r->Assign(3, new Val(nsec3->nsec_hash_algo, TYPE_COUNT));
|
||||||
|
r->Assign(4, new Val(nsec3->nsec_iter, TYPE_COUNT));
|
||||||
|
r->Assign(5, new Val(nsec3->nsec_salt_len, TYPE_COUNT));
|
||||||
|
r->Assign(6, new StringVal(nsec3->nsec_salt));
|
||||||
|
r->Assign(7, new Val(nsec3->nsec_hlen, TYPE_COUNT));
|
||||||
|
r->Assign(8, new StringVal(nsec3->nsec_hash));
|
||||||
|
r->Assign(9, new Val(is_query, TYPE_COUNT));
|
||||||
|
|
||||||
|
delete nsec3;
|
||||||
|
nsec3 = 0;
|
||||||
|
|
||||||
|
return r;
|
||||||
|
}
|
||||||
|
|
||||||
|
Val* DNS_MsgInfo::BuildDS_Val()
|
||||||
|
{
|
||||||
|
RecordVal* r = new RecordVal(dns_ds_additional);
|
||||||
|
|
||||||
|
Ref(query_name);
|
||||||
|
r->Assign(0, query_name);
|
||||||
|
r->Assign(1, new Val(int(answer_type), TYPE_COUNT));
|
||||||
|
r->Assign(2, new Val(ds->key_tag, TYPE_COUNT));
|
||||||
|
r->Assign(3, new Val(ds->algorithm, TYPE_COUNT));
|
||||||
|
r->Assign(4, new Val(ds->digest_type, TYPE_COUNT));
|
||||||
|
r->Assign(5, new StringVal(ds->digest_val));
|
||||||
|
r->Assign(6, new Val(is_query, TYPE_COUNT));
|
||||||
|
|
||||||
|
delete ds;
|
||||||
|
ds = 0;
|
||||||
|
|
||||||
|
return r;
|
||||||
|
}
|
||||||
|
|
||||||
Contents_DNS::Contents_DNS(Connection* conn, bool orig,
|
Contents_DNS::Contents_DNS(Connection* conn, bool orig,
|
||||||
DNS_Interpreter* arg_interp)
|
DNS_Interpreter* arg_interp)
|
||||||
: tcp::TCP_SupportAnalyzer("CONTENTS_DNS", conn, orig)
|
: tcp::TCP_SupportAnalyzer("CONTENTS_DNS", conn, orig)
|
||||||
|
|
|
||||||
|
|
@ -57,7 +57,12 @@ typedef enum {
|
||||||
TYPE_TKEY = 249, ///< Transaction Key (RFC 2930)
|
TYPE_TKEY = 249, ///< Transaction Key (RFC 2930)
|
||||||
TYPE_TSIG = 250, ///< Transaction Signature (RFC 2845)
|
TYPE_TSIG = 250, ///< Transaction Signature (RFC 2845)
|
||||||
TYPE_CAA = 257, ///< Certification Authority Authorization (RFC 6844)
|
TYPE_CAA = 257, ///< Certification Authority Authorization (RFC 6844)
|
||||||
|
// DNSSEC RR's
|
||||||
|
TYPE_RRSIG = 46, ///< RR Signature record type (RFC4043)
|
||||||
|
TYPE_NSEC = 47, ///< Next Secure record (RFC4043)
|
||||||
|
TYPE_DNSKEY = 48, ///< DNS Key record (RFC 4034)
|
||||||
|
TYPE_DS = 43, ///< Delegation signer (RFC 4034)
|
||||||
|
TYPE_NSEC3 = 50,
|
||||||
// The following are only valid in queries.
|
// The following are only valid in queries.
|
||||||
TYPE_AXFR = 252,
|
TYPE_AXFR = 252,
|
||||||
TYPE_ALL = 255,
|
TYPE_ALL = 255,
|
||||||
|
|
@ -75,6 +80,33 @@ typedef enum {
|
||||||
DNS_ADDITIONAL,
|
DNS_ADDITIONAL,
|
||||||
} DNS_AnswerType;
|
} DNS_AnswerType;
|
||||||
|
|
||||||
|
typedef enum {
|
||||||
|
reserved0 = 0,
|
||||||
|
RSA_MD5 = 1, ///< [RFC2537] NOT RECOMMENDED
|
||||||
|
Diffie_Hellman = 2, ///< [RFC2539]
|
||||||
|
DSA_SHA1 = 3, ///< [RFC2536] OPTIONAL
|
||||||
|
Elliptic_Curve = 4,
|
||||||
|
RSA_SHA1 = 5, ///< [RFC3110] MANDATORY
|
||||||
|
DSA_NSEC3_SHA1 = 6,
|
||||||
|
RSA_SHA1_NSEC3_SHA1 = 7,
|
||||||
|
RSA_SHA256 = 8,
|
||||||
|
RSA_SHA512 = 10,
|
||||||
|
GOST_R_34_10_2001 = 12,
|
||||||
|
ECDSA_curveP256withSHA256 = 13,
|
||||||
|
ECDSA_curveP384withSHA384 =14,
|
||||||
|
Indirect = 252, ///<
|
||||||
|
PrivateDNS = 253, ///< OPTIONAL
|
||||||
|
PrivateOID = 254, ///< OPTIONAL
|
||||||
|
reserved255 = 255,
|
||||||
|
} DNSSEC_Algo;
|
||||||
|
|
||||||
|
typedef enum {
|
||||||
|
reserved = 0,
|
||||||
|
SHA1 = 1, ///< [RFC3110] MANDATORY
|
||||||
|
SHA256 = 2,
|
||||||
|
GOST_R_34_11_94 = 3,
|
||||||
|
SHA384 = 4,
|
||||||
|
} DNSSEC_Digest;
|
||||||
|
|
||||||
struct DNS_RawMsgHdr {
|
struct DNS_RawMsgHdr {
|
||||||
unsigned short id;
|
unsigned short id;
|
||||||
|
|
@ -105,6 +137,42 @@ struct TSIG_DATA {
|
||||||
unsigned short rr_error;
|
unsigned short rr_error;
|
||||||
};
|
};
|
||||||
|
|
||||||
|
struct RRSIG_DATA {
|
||||||
|
unsigned short type_covered; // 16 : ExtractShort(data, len)
|
||||||
|
unsigned short algorithm; // 8
|
||||||
|
unsigned short labels; // 8
|
||||||
|
uint32 orig_ttl; // 32
|
||||||
|
unsigned long sig_exp; // 32
|
||||||
|
unsigned long sig_incep; // 32
|
||||||
|
unsigned short key_tag; //16
|
||||||
|
BroString* signer_name;
|
||||||
|
BroString* signature;
|
||||||
|
};
|
||||||
|
|
||||||
|
struct DNSKEY_DATA {
|
||||||
|
unsigned short dflags; // 16 : ExtractShort(data, len)
|
||||||
|
unsigned short dalgorithm; // 8
|
||||||
|
unsigned short dprotocol; // 8
|
||||||
|
BroString* public_key; // Variable lenght Public Key
|
||||||
|
};
|
||||||
|
|
||||||
|
struct NSEC3_DATA {
|
||||||
|
unsigned short nsec_flags;
|
||||||
|
unsigned short nsec_hash_algo;
|
||||||
|
unsigned short nsec_iter;
|
||||||
|
unsigned short nsec_salt_len;
|
||||||
|
BroString* nsec_salt;
|
||||||
|
unsigned short nsec_hlen;
|
||||||
|
BroString* nsec_hash;
|
||||||
|
};
|
||||||
|
|
||||||
|
struct DS_DATA {
|
||||||
|
unsigned short key_tag; // 16 : ExtractShort(data, len)
|
||||||
|
unsigned short algorithm; // 8
|
||||||
|
unsigned short digest_type; // 8
|
||||||
|
BroString* digest_val; // Variable lenght Digest of DNSKEY RR
|
||||||
|
};
|
||||||
|
|
||||||
class DNS_MsgInfo {
|
class DNS_MsgInfo {
|
||||||
public:
|
public:
|
||||||
DNS_MsgInfo(DNS_RawMsgHdr* hdr, int is_query);
|
DNS_MsgInfo(DNS_RawMsgHdr* hdr, int is_query);
|
||||||
|
|
@ -114,6 +182,10 @@ public:
|
||||||
Val* BuildAnswerVal();
|
Val* BuildAnswerVal();
|
||||||
Val* BuildEDNS_Val();
|
Val* BuildEDNS_Val();
|
||||||
Val* BuildTSIG_Val();
|
Val* BuildTSIG_Val();
|
||||||
|
Val* BuildRRSIG_Val();
|
||||||
|
Val* BuildDNSKEY_Val();
|
||||||
|
Val* BuildNSEC3_Val();
|
||||||
|
Val* BuildDS_Val();
|
||||||
|
|
||||||
int id;
|
int id;
|
||||||
int opcode; ///< query type, see DNS_Opcode
|
int opcode; ///< query type, see DNS_Opcode
|
||||||
|
|
@ -143,9 +215,14 @@ public:
|
||||||
///< for forward lookups
|
///< for forward lookups
|
||||||
|
|
||||||
// More values for spesific DNS types.
|
// More values for spesific DNS types.
|
||||||
// struct EDNS_ADDITIONAL* edns;
|
//struct EDNS_ADDITIONAL* edns;
|
||||||
|
//DNSSEC_Algo dnssec_algo;
|
||||||
struct TSIG_DATA* tsig;
|
struct TSIG_DATA* tsig;
|
||||||
|
struct RRSIG_DATA* rrsig;
|
||||||
|
struct DNSKEY_DATA* dnskey;
|
||||||
|
struct NSEC3_DATA* nsec3;
|
||||||
|
struct DS_DATA* ds;
|
||||||
|
|
||||||
};
|
};
|
||||||
|
|
||||||
|
|
||||||
|
|
@ -183,6 +260,8 @@ protected:
|
||||||
uint32 ExtractLong(const u_char*& data, int& len);
|
uint32 ExtractLong(const u_char*& data, int& len);
|
||||||
void ExtractOctets(const u_char*& data, int& len, BroString** p);
|
void ExtractOctets(const u_char*& data, int& len, BroString** p);
|
||||||
|
|
||||||
|
void ExtractStream(const u_char*& data, int& len, BroString** p, int sig_len);
|
||||||
|
|
||||||
int ParseRR_Name(DNS_MsgInfo* msg,
|
int ParseRR_Name(DNS_MsgInfo* msg,
|
||||||
const u_char*& data, int& len, int rdlength,
|
const u_char*& data, int& len, int rdlength,
|
||||||
const u_char* msg_start);
|
const u_char* msg_start);
|
||||||
|
|
@ -218,7 +297,21 @@ protected:
|
||||||
int ParseRR_TSIG(DNS_MsgInfo* msg,
|
int ParseRR_TSIG(DNS_MsgInfo* msg,
|
||||||
const u_char*& data, int& len, int rdlength,
|
const u_char*& data, int& len, int rdlength,
|
||||||
const u_char* msg_start);
|
const u_char* msg_start);
|
||||||
|
int ParseRR_RRSIG(DNS_MsgInfo* msg,
|
||||||
|
const u_char*& data, int& len, int rdlength,
|
||||||
|
const u_char* msg_start);
|
||||||
|
int ParseRR_DNSKEY(DNS_MsgInfo* msg,
|
||||||
|
const u_char*& data, int& len, int rdlength,
|
||||||
|
const u_char* msg_start);
|
||||||
|
int ParseRR_NSEC(DNS_MsgInfo* msg,
|
||||||
|
const u_char*& data, int& len, int rdlength,
|
||||||
|
const u_char* msg_start);
|
||||||
|
int ParseRR_NSEC3(DNS_MsgInfo* msg,
|
||||||
|
const u_char*& data, int& len, int rdlength,
|
||||||
|
const u_char* msg_start);
|
||||||
|
int ParseRR_DS(DNS_MsgInfo* msg,
|
||||||
|
const u_char*& data, int& len, int rdlength,
|
||||||
|
const u_char* msg_start);
|
||||||
void SendReplyOrRejectEvent(DNS_MsgInfo* msg, EventHandlerPtr event,
|
void SendReplyOrRejectEvent(DNS_MsgInfo* msg, EventHandlerPtr event,
|
||||||
const u_char*& data, int& len,
|
const u_char*& data, int& len,
|
||||||
BroString* question_name);
|
BroString* question_name);
|
||||||
|
|
@ -270,7 +363,6 @@ public:
|
||||||
void Done() override;
|
void Done() override;
|
||||||
void ConnectionClosed(tcp::TCP_Endpoint* endpoint,
|
void ConnectionClosed(tcp::TCP_Endpoint* endpoint,
|
||||||
tcp::TCP_Endpoint* peer, int gen_event) override;
|
tcp::TCP_Endpoint* peer, int gen_event) override;
|
||||||
|
|
||||||
void ExpireTimer(double t);
|
void ExpireTimer(double t);
|
||||||
|
|
||||||
static analyzer::Analyzer* Instantiate(Connection* conn)
|
static analyzer::Analyzer* Instantiate(Connection* conn)
|
||||||
|
|
|
||||||
|
|
@ -493,6 +493,69 @@ event dns_EDNS_addl%(c: connection, msg: dns_msg, ans: dns_edns_additional%);
|
||||||
## dns_skip_addl dns_skip_all_addl dns_skip_all_auth dns_skip_auth
|
## dns_skip_addl dns_skip_all_addl dns_skip_all_auth dns_skip_auth
|
||||||
event dns_TSIG_addl%(c: connection, msg: dns_msg, ans: dns_tsig_additional%);
|
event dns_TSIG_addl%(c: connection, msg: dns_msg, ans: dns_tsig_additional%);
|
||||||
|
|
||||||
|
## Generated for DNS replies of type *RRSIG*. For replies with multiple answers,
|
||||||
|
## an individual event of the corresponding type is raised for each.
|
||||||
|
##
|
||||||
|
## c: The connection, which may be UDP or TCP depending on the type of the
|
||||||
|
## transport-layer session being analyzed.
|
||||||
|
##
|
||||||
|
## msg: The parsed DNS message header.
|
||||||
|
##
|
||||||
|
## ans: The type-independent part of the parsed answer record.
|
||||||
|
## rrsig: The parsed RRSIG reply.
|
||||||
|
event dns_RRSIG_addl%(c: connection, msg: dns_msg, ans: dns_answer, rrsig: dns_rrsig_additional%);
|
||||||
|
|
||||||
|
## Generated for DNS replies of type *DNSKEY*. For replies with multiple answers,
|
||||||
|
## an individual event of the corresponding type is raised for each.
|
||||||
|
##
|
||||||
|
## c: The connection, which may be UDP or TCP depending on the type of the
|
||||||
|
## transport-layer session being analyzed.
|
||||||
|
##
|
||||||
|
## msg: The parsed DNS message header.
|
||||||
|
##
|
||||||
|
## ans: The type-independent part of the parsed answer record.
|
||||||
|
## dnskey: The parsed DNSKEY reply.
|
||||||
|
event dns_DNSKEY_addl%(c: connection, msg: dns_msg, ans: dns_answer, dnskey: dns_dnskey_additional%);
|
||||||
|
|
||||||
|
## Generated for DNS replies of type *NSEC*. For replies with multiple answers,
|
||||||
|
## an individual event of the corresponding type is raised for each.
|
||||||
|
##
|
||||||
|
## c: The connection, which may be UDP or TCP depending on the type of the
|
||||||
|
## transport-layer session being analyzed.
|
||||||
|
##
|
||||||
|
## msg: The parsed DNS message header.
|
||||||
|
##
|
||||||
|
## ans: The type-independent part of the parsed answer record.
|
||||||
|
## next_name: The parsed next secure domain name.
|
||||||
|
## bitmaps: vector of strings in hex for the bit maps present.
|
||||||
|
event dns_NSEC_addl%(c: connection, msg: dns_msg, ans: dns_answer, next_name: string, bitmaps: string_vec%);
|
||||||
|
|
||||||
|
## Generated for DNS replies of type *NSEC3*. For replies with multiple answers,
|
||||||
|
## an individual event of the corresponding type is raised for each.
|
||||||
|
##
|
||||||
|
## c: The connection, which may be UDP or TCP depending on the type of the
|
||||||
|
## transport-layer session being analyzed.
|
||||||
|
##
|
||||||
|
## msg: The parsed DNS message header.
|
||||||
|
##
|
||||||
|
## ans: The type-independent part of the parsed answer record.
|
||||||
|
## nsec3: The parsed RDATA of Nsec3 reply.
|
||||||
|
## bitmaps: vector of strings in hex for the bit maps present.
|
||||||
|
event dns_NSEC3_addl%(c: connection, msg: dns_msg, ans: dns_answer, nsec3: dns_nsec3_additional, bitmaps: string_vec%);
|
||||||
|
|
||||||
|
## Generated for DNS replies of type *DS*. For replies with multiple answers,
|
||||||
|
## an individual event of the corresponding type is raised for each.
|
||||||
|
##
|
||||||
|
## c: The connection, which may be UDP or TCP depending on the type of the
|
||||||
|
## transport-layer session being analyzed.
|
||||||
|
##
|
||||||
|
## msg: The parsed DNS message header.
|
||||||
|
##
|
||||||
|
## ans: The type-independent part of the parsed answer record.
|
||||||
|
## ds: The parsed RDATA of DS reply.
|
||||||
|
##
|
||||||
|
event dns_DS_addl%(c: connection, msg: dns_msg, ans: dns_answer, ds: dns_ds_additional%);
|
||||||
|
|
||||||
## Generated at the end of processing a DNS packet. This event is the last
|
## Generated at the end of processing a DNS packet. This event is the last
|
||||||
## ``dns_*`` event that will be raised for a DNS query/reply and signals that
|
## ``dns_*`` event that will be raised for a DNS query/reply and signals that
|
||||||
## all resource records have been passed on.
|
## all resource records have been passed on.
|
||||||
|
|
|
||||||
|
|
@ -0,0 +1,13 @@
|
||||||
|
#separator \x09
|
||||||
|
#set_separator ,
|
||||||
|
#empty_field (empty)
|
||||||
|
#unset_field -
|
||||||
|
#path dns
|
||||||
|
#open 2018-09-05-15-35-13
|
||||||
|
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p proto trans_id rtt query qclass qclass_name qtype qtype_name rcode rcode_name AA TC RD RA Z answers TTLs rejected
|
||||||
|
#types time string addr port addr port enum count interval string count string count string count string bool bool bool bool count vector[string] vector[interval] bool
|
||||||
|
1533309955.393636 ClEkJM2Vm5giqnMf4h 35.184.172.191 10267 128.175.13.16 53 udp 17129 0.003405 virgo.sas.upenn.edu 1 C_INTERNET 1 A 0 NOERROR T F F F 1 128.91.234.142,RRSIG_Signer_upenn.edu 30.000000,30.000000 F
|
||||||
|
1533309959.571738 C4J4Th3PJpwUYZZ6gc 35.184.172.191 50056 128.175.13.16 53 udp 26222 0.003363 virgo.sas.upenn.edu 1 C_INTERNET 1 A 0 NOERROR T F F F 1 128.91.234.142,RRSIG_Signer_upenn.edu 30.000000,30.000000 F
|
||||||
|
1533309959.968589 CtPZjS20MLrsMUOJi2 35.184.172.191 39975 128.175.13.16 53 udp 27118 0.003748 workfamily.sas.upenn.edu 1 C_INTERNET 1 A 0 NOERROR T F F F 1 quasar.sas.upenn.edu,RRSIG_Signer_upenn.edu,128.91.234.145,RRSIG_Signer_upenn.edu 900.000000,900.000000,30.000000,30.000000 F
|
||||||
|
1533309950.391966 CHhAvVGS1DHFjwGM9 35.184.172.191 5386 128.175.13.16 53 udp 62809 - virgo.sas.upenn.edu 1 C_INTERNET 1 A - - F F F F 1 - - F
|
||||||
|
#close 2018-09-05-15-35-13
|
||||||
|
|
@ -0,0 +1,11 @@
|
||||||
|
#separator \x09
|
||||||
|
#set_separator ,
|
||||||
|
#empty_field (empty)
|
||||||
|
#unset_field -
|
||||||
|
#path dns
|
||||||
|
#open 2018-09-05-15-51-18
|
||||||
|
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p proto trans_id rtt query qclass qclass_name qtype qtype_name rcode rcode_name AA TC RD RA Z answers TTLs rejected auth addl
|
||||||
|
#types time string addr port addr port enum count interval string count string count string count string bool bool bool bool count vector[string] vector[interval] bool set[string] set[string]
|
||||||
|
1533310046.924340 CHhAvVGS1DHFjwGM9 35.184.172.191 57073 128.175.13.16 53 udp 130 - dla.library.upenn.edu 1 C_INTERNET 28 AAAA 0 NOERROR F F F F 1 - - F dlxssvr.library.upenn.edu,assailants.net.isc.upenn.edu,RRSIG_Signer_upenn.edu -
|
||||||
|
1533310049.812056 ClEkJM2Vm5giqnMf4h 35.184.172.191 50693 128.175.13.16 53 udp 51063 0.001515 www.upenn.edu 1 C_INTERNET 1 A 0 NOERROR T F F F 1 www.upenn.edgekey.net,RRSIG_Signer_upenn.edu 300.000000,300.000000 F - -
|
||||||
|
#close 2018-09-05-15-51-18
|
||||||
BIN
testing/btest/Traces/nsec-test.trace
Normal file
BIN
testing/btest/Traces/nsec-test.trace
Normal file
Binary file not shown.
BIN
testing/btest/Traces/rrsig.trace
Normal file
BIN
testing/btest/Traces/rrsig.trace
Normal file
Binary file not shown.
4
testing/btest/scripts/base/protocols/dns/rrsig-test.bro
Normal file
4
testing/btest/scripts/base/protocols/dns/rrsig-test.bro
Normal file
|
|
@ -0,0 +1,4 @@
|
||||||
|
# This tests the case where the queries and responses include DNSSEC RRs.
|
||||||
|
#
|
||||||
|
# @TEST-EXEC: bro -r $TRACES/rrsig.trace
|
||||||
|
# @TEST-EXEC: btest-diff dns.log
|
||||||
|
|
@ -0,0 +1,4 @@
|
||||||
|
# @TEST-EXEC: bro -r $TRACES/nsec-test.trace %INPUT
|
||||||
|
# @TEST-EXEC: btest-diff dns.log
|
||||||
|
|
||||||
|
@load protocols/dns/auth-addl
|
||||||
Loading…
Add table
Add a link
Reference in a new issue