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Diffstat (limited to 'lib/public_key/test/erl_make_certs.erl')
| -rw-r--r-- | lib/public_key/test/erl_make_certs.erl | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/lib/public_key/test/erl_make_certs.erl b/lib/public_key/test/erl_make_certs.erl new file mode 100644 index 0000000000..e28371e02b --- /dev/null +++ b/lib/public_key/test/erl_make_certs.erl @@ -0,0 +1,421 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2010. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd% +%% + +%% Create test certificates + +-module(pkey_test). +-include_lib("public_key/include/public_key.hrl"). + +-export([make_cert/1, gen_rsa/1, verify_signature/3, write_pem/3]). +-compile(export_all). + +%%-------------------------------------------------------------------- +%% @doc Create and return a der encoded certificate +%% Option Default +%% ------------------------------------------------------- +%% digest sha1 +%% validity {date(), date() + week()} +%% version 3 +%% subject [] list of the following content +%% {name, Name} +%% {email, Email} +%% {city, City} +%% {state, State} +%% {org, Org} +%% {org_unit, OrgUnit} +%% {country, Country} +%% {serial, Serial} +%% {title, Title} +%% {dnQualifer, DnQ} +%% issuer = {Issuer, IssuerKey} true (i.e. a ca cert is created) +%% (obs IssuerKey migth be {Key, Password} +%% key = KeyFile|KeyBin|rsa|dsa Subject PublicKey rsa or dsa generates key +%% +%% +%% (OBS: The generated keys are for testing only) +%% @spec ([{::atom(), ::term()}]) -> {Cert::binary(), Key::binary()} +%% @end +%%-------------------------------------------------------------------- + +make_cert(Opts) -> + SubjectPrivateKey = get_key(Opts), + {TBSCert, IssuerKey} = make_tbs(SubjectPrivateKey, Opts), + Cert = public_key:pkix_sign(TBSCert, IssuerKey), + true = verify_signature(Cert, IssuerKey, undef), %% verify that the keys where ok + {Cert, encode_key(SubjectPrivateKey)}. + +%%-------------------------------------------------------------------- +%% @doc Writes pem files in Dir with FileName ++ ".pem" and FileName ++ "_key.pem" +%% @spec (::string(), ::string(), {Cert,Key}) -> ok +%% @end +%%-------------------------------------------------------------------- +write_pem(Dir, FileName, {Cert, Key = {_,_,not_encrypted}}) when is_binary(Cert) -> + ok = der_to_pem(filename:join(Dir, FileName ++ ".pem"), + [{'Certificate', Cert, not_encrypted}]), + ok = der_to_pem(filename:join(Dir, FileName ++ "_key.pem"), [Key]). + +%%-------------------------------------------------------------------- +%% @doc Creates a rsa key (OBS: for testing only) +%% the size are in bytes +%% @spec (::integer()) -> {::atom(), ::binary(), ::opaque()} +%% @end +%%-------------------------------------------------------------------- +gen_rsa(Size) when is_integer(Size) -> + Key = gen_rsa2(Size), + {Key, encode_key(Key)}. + +%%-------------------------------------------------------------------- +%% @doc Creates a dsa key (OBS: for testing only) +%% the sizes are in bytes +%% @spec (::integer()) -> {::atom(), ::binary(), ::opaque()} +%% @end +%%-------------------------------------------------------------------- +gen_dsa(LSize,NSize) when is_integer(LSize), is_integer(NSize) -> + Key = gen_dsa2(LSize, NSize), + {Key, encode_key(Key)}. + +%%-------------------------------------------------------------------- +%% @doc Verifies cert signatures +%% @spec (::binary(), ::tuple()) -> ::boolean() +%% @end +%%-------------------------------------------------------------------- +verify_signature(DerEncodedCert, DerKey, _KeyParams) -> + Key = decode_key(DerKey), + case Key of + #'RSAPrivateKey'{modulus=Mod, publicExponent=Exp} -> + public_key:pkix_verify(DerEncodedCert, + #'RSAPublicKey'{modulus=Mod, publicExponent=Exp}); + #'DSAPrivateKey'{p=P, q=Q, g=G, y=Y} -> + public_key:pkix_verify(DerEncodedCert, {Y, #'Dss-Parms'{p=P, q=Q, g=G}}) + end. + +%%%%%%%%%%%%%%%%%%%%%%%%% Implementation %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +get_key(Opts) -> + case proplists:get_value(key, Opts) of + undefined -> make_key(rsa, Opts); + rsa -> make_key(rsa, Opts); + dsa -> make_key(dsa, Opts); + Key -> + Password = proplists:get_value(password, Opts, no_passwd), + decode_key(Key, Password) + end. + +decode_key({Key, Pw}) -> + decode_key(Key, Pw); +decode_key(Key) -> + decode_key(Key, no_passwd). + + +decode_key(#'RSAPublicKey'{} = Key,_) -> + Key; +decode_key(#'RSAPrivateKey'{} = Key,_) -> + Key; +decode_key(#'DSAPrivateKey'{} = Key,_) -> + Key; +decode_key(PemEntry = {_,_,_}, Pw) -> + public_key:pem_entry_decode(PemEntry, Pw); +decode_key(PemBin, Pw) -> + [KeyInfo] = public_key:pem_decode(PemBin), + decode_key(KeyInfo, Pw). + +encode_key(Key = #'RSAPrivateKey'{}) -> + {ok, Der} = 'OTP-PUB-KEY':encode('RSAPrivateKey', Key), + {'RSAPrivateKey', list_to_binary(Der), not_encrypted}; +encode_key(Key = #'DSAPrivateKey'{}) -> + {ok, Der} = 'OTP-PUB-KEY':encode('DSAPrivateKey', Key), + {'DSAPrivateKey', list_to_binary(Der), not_encrypted}. + +make_tbs(SubjectKey, Opts) -> + Version = list_to_atom("v"++integer_to_list(proplists:get_value(version, Opts, 3))), + + IssuerProp = proplists:get_value(issuer, Opts, true), + {Issuer, IssuerKey} = issuer(IssuerProp, Opts, SubjectKey), + + {Algo, Parameters} = sign_algorithm(IssuerKey, Opts), + + SignAlgo = #'SignatureAlgorithm'{algorithm = Algo, + parameters = Parameters}, + Subject = case IssuerProp of + true -> %% Is a Root Ca + Issuer; + _ -> + subject(proplists:get_value(subject, Opts),false) + end, + + {#'OTPTBSCertificate'{serialNumber = trunc(random:uniform()*100000000)*10000 + 1, + signature = SignAlgo, + issuer = Issuer, + validity = validity(Opts), + subject = Subject, + subjectPublicKeyInfo = publickey(SubjectKey), + version = Version, + extensions = extensions(Opts) + }, IssuerKey}. + +issuer(true, Opts, SubjectKey) -> + %% Self signed + {subject(proplists:get_value(subject, Opts), true), SubjectKey}; +issuer({Issuer, IssuerKey}, _Opts, _SubjectKey) when is_binary(Issuer) -> + {issuer_der(Issuer), decode_key(IssuerKey)}; +issuer({File, IssuerKey}, _Opts, _SubjectKey) when is_list(File) -> + {ok, [{cert, Cert, _}|_]} = public_key:pem_to_der(File), + {issuer_der(Cert), decode_key(IssuerKey)}. + +issuer_der(Issuer) -> + Decoded = public_key:pkix_decode_cert(Issuer, otp), + #'OTPCertificate'{tbsCertificate=Tbs} = Decoded, + #'OTPTBSCertificate'{subject=Subject} = Tbs, + Subject. + +subject(undefined, IsRootCA) -> + User = if IsRootCA -> "RootCA"; true -> os:getenv("USER") end, + Opts = [{email, User ++ "@erlang.org"}, + {name, User}, + {city, "Stockholm"}, + {country, "SE"}, + {org, "erlang"}, + {org_unit, "testing dep"}], + subject(Opts); +subject(Opts, _) -> + subject(Opts). + +subject(SubjectOpts) when is_list(SubjectOpts) -> + Encode = fun(Opt) -> + {Type,Value} = subject_enc(Opt), + [#'AttributeTypeAndValue'{type=Type, value=Value}] + end, + {rdnSequence, [Encode(Opt) || Opt <- SubjectOpts]}. + +%% Fill in the blanks +subject_enc({name, Name}) -> {?'id-at-commonName', {printableString, Name}}; +subject_enc({email, Email}) -> {?'id-emailAddress', Email}; +subject_enc({city, City}) -> {?'id-at-localityName', {printableString, City}}; +subject_enc({state, State}) -> {?'id-at-stateOrProvinceName', {printableString, State}}; +subject_enc({org, Org}) -> {?'id-at-organizationName', {printableString, Org}}; +subject_enc({org_unit, OrgUnit}) -> {?'id-at-organizationalUnitName', {printableString, OrgUnit}}; +subject_enc({country, Country}) -> {?'id-at-countryName', Country}; +subject_enc({serial, Serial}) -> {?'id-at-serialNumber', Serial}; +subject_enc({title, Title}) -> {?'id-at-title', {printableString, Title}}; +subject_enc({dnQualifer, DnQ}) -> {?'id-at-dnQualifier', DnQ}; +subject_enc(Other) -> Other. + + +extensions(Opts) -> + case proplists:get_value(extensions, Opts, []) of + false -> + asn1_NOVALUE; + Exts -> + lists:flatten([extension(Ext) || Ext <- default_extensions(Exts)]) + end. + +default_extensions(Exts) -> + Def = [{key_usage,undefined}, + {subject_altname, undefined}, + {issuer_altname, undefined}, + {basic_constraints, default}, + {name_constraints, undefined}, + {policy_constraints, undefined}, + {ext_key_usage, undefined}, + {inhibit_any, undefined}, + {auth_key_id, undefined}, + {subject_key_id, undefined}, + {policy_mapping, undefined}], + Filter = fun({Key, _}, D) -> lists:keydelete(Key, 1, D) end, + Exts ++ lists:foldl(Filter, Def, Exts). + +extension({_, undefined}) -> []; +extension({basic_constraints, Data}) -> + case Data of + default -> + #'Extension'{extnID = ?'id-ce-basicConstraints', + extnValue = #'BasicConstraints'{cA=true}, + critical=true}; + false -> + []; + Len when is_integer(Len) -> + #'Extension'{extnID = ?'id-ce-basicConstraints', + extnValue = #'BasicConstraints'{cA=true, pathLenConstraint=Len}, + critical=true}; + _ -> + #'Extension'{extnID = ?'id-ce-basicConstraints', + extnValue = Data} + end; +extension({Id, Data, Critical}) -> + #'Extension'{extnID = Id, extnValue = Data, critical = Critical}. + + +publickey(#'RSAPrivateKey'{modulus=N, publicExponent=E}) -> + Public = #'RSAPublicKey'{modulus=N, publicExponent=E}, + Algo = #'PublicKeyAlgorithm'{algorithm= ?rsaEncryption, parameters='NULL'}, + #'OTPSubjectPublicKeyInfo'{algorithm = Algo, + subjectPublicKey = Public}; +publickey(#'DSAPrivateKey'{p=P, q=Q, g=G, y=Y}) -> + Algo = #'PublicKeyAlgorithm'{algorithm= ?'id-dsa', + parameters=#'Dss-Parms'{p=P, q=Q, g=G}}, + #'OTPSubjectPublicKeyInfo'{algorithm = Algo, subjectPublicKey = Y}. + +validity(Opts) -> + DefFrom0 = calendar:gregorian_days_to_date(calendar:date_to_gregorian_days(date())-1), + DefTo0 = calendar:gregorian_days_to_date(calendar:date_to_gregorian_days(date())+7), + {DefFrom, DefTo} = proplists:get_value(validity, Opts, {DefFrom0, DefTo0}), + Format = fun({Y,M,D}) -> lists:flatten(io_lib:format("~w~2..0w~2..0w000000Z",[Y,M,D])) end, + #'Validity'{notBefore={generalTime, Format(DefFrom)}, + notAfter ={generalTime, Format(DefTo)}}. + +sign_algorithm(#'RSAPrivateKey'{}, Opts) -> + Type = case proplists:get_value(digest, Opts, sha1) of + sha1 -> ?'sha1WithRSAEncryption'; + sha512 -> ?'sha512WithRSAEncryption'; + sha384 -> ?'sha384WithRSAEncryption'; + sha256 -> ?'sha256WithRSAEncryption'; + md5 -> ?'md5WithRSAEncryption'; + md2 -> ?'md2WithRSAEncryption' + end, + {Type, 'NULL'}; +sign_algorithm(#'DSAPrivateKey'{p=P, q=Q, g=G}, _Opts) -> + {?'id-dsa-with-sha1', #'Dss-Parms'{p=P, q=Q, g=G}}. + +make_key(rsa, _Opts) -> + %% (OBS: for testing only) + gen_rsa2(64); +make_key(dsa, _Opts) -> + gen_dsa2(128, 20). %% Bytes i.e. {1024, 160} + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% RSA key generation (OBS: for testing only) +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +-define(SMALL_PRIMES, [65537,97,89,83,79,73,71,67,61,59,53, + 47,43,41,37,31,29,23,19,17,13,11,7,5,3]). + +gen_rsa2(Size) -> + P = prime(Size), + Q = prime(Size), + N = P*Q, + Tot = (P - 1) * (Q - 1), + [E|_] = lists:dropwhile(fun(Candidate) -> (Tot rem Candidate) == 0 end, ?SMALL_PRIMES), + {D1,D2} = extended_gcd(E, Tot), + D = erlang:max(D1,D2), + case D < E of + true -> + gen_rsa2(Size); + false -> + {Co1,Co2} = extended_gcd(Q, P), + Co = erlang:max(Co1,Co2), + #'RSAPrivateKey'{version = 'two-prime', + modulus = N, + publicExponent = E, + privateExponent = D, + prime1 = P, + prime2 = Q, + exponent1 = D rem (P-1), + exponent2 = D rem (Q-1), + coefficient = Co + } + end. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% DSA key generation (OBS: for testing only) +%% See http://en.wikipedia.org/wiki/Digital_Signature_Algorithm +%% and the fips_186-3.pdf +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +gen_dsa2(LSize, NSize) -> + Q = prime(NSize), %% Choose N-bit prime Q + X0 = prime(LSize), + P0 = prime((LSize div 2) +1), + + %% Choose L-bit prime modulus P such that p–1 is a multiple of q. + case dsa_search(X0 div (2*Q*P0), P0, Q, 1000) of + error -> + gen_dsa2(LSize, NSize); + P -> + G = crypto:mod_exp(2, (P-1) div Q, P), % Choose G a number whose multiplicative order modulo p is q. + %% such that This may be done by setting g = h^(p–1)/q mod p, commonly h=2 is used. + + X = prime(20), %% Choose x by some random method, where 0 < x < q. + Y = crypto:mod_exp(G, X, P), %% Calculate y = g^x mod p. + + #'DSAPrivateKey'{version=0, p=P, q=Q, g=G, y=Y, x=X} + end. + +%% See fips_186-3.pdf +dsa_search(T, P0, Q, Iter) when Iter > 0 -> + P = 2*T*Q*P0 + 1, + case is_prime(crypto:mpint(P), 50) of + true -> P; + false -> dsa_search(T+1, P0, Q, Iter-1) + end; +dsa_search(_,_,_,_) -> + error. + + +%%%%%%% Crypto Math %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +prime(ByteSize) -> + Rand = odd_rand(ByteSize), + crypto:erlint(prime_odd(Rand, 0)). + +prime_odd(Rand, N) -> + case is_prime(Rand, 50) of + true -> + Rand; + false -> + NotPrime = crypto:erlint(Rand), + prime_odd(crypto:mpint(NotPrime+2), N+1) + end. + +%% see http://en.wikipedia.org/wiki/Fermat_primality_test +is_prime(_, 0) -> true; +is_prime(Candidate, Test) -> + CoPrime = odd_rand(<<0,0,0,4, 10000:32>>, Candidate), + case crypto:mod_exp(CoPrime, Candidate, Candidate) of + CoPrime -> is_prime(Candidate, Test-1); + _ -> false + end. + +odd_rand(Size) -> + Min = 1 bsl (Size*8-1), + Max = (1 bsl (Size*8))-1, + odd_rand(crypto:mpint(Min), crypto:mpint(Max)). + +odd_rand(Min,Max) -> + Rand = <<Sz:32, _/binary>> = crypto:rand_uniform(Min,Max), + BitSkip = (Sz+4)*8-1, + case Rand of + Odd = <<_:BitSkip, 1:1>> -> Odd; + Even = <<_:BitSkip, 0:1>> -> + crypto:mpint(crypto:erlint(Even)+1) + end. + +extended_gcd(A, B) -> + case A rem B of + 0 -> + {0, 1}; + N -> + {X, Y} = extended_gcd(B, N), + {Y, X-Y*(A div B)} + end. + +pem_to_der(File) -> + {ok, PemBin} = file:read_file(File), + public_key:pem_decode(PemBin). + +der_to_pem(File, Entries) -> + PemBin = public_key:pem_encode(Entries), + file:write_file(File, PemBin). |