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Diffstat (limited to 'lib/public_key/src/pubkey_crl.erl')
-rw-r--r-- | lib/public_key/src/pubkey_crl.erl | 701 |
1 files changed, 701 insertions, 0 deletions
diff --git a/lib/public_key/src/pubkey_crl.erl b/lib/public_key/src/pubkey_crl.erl new file mode 100644 index 0000000000..3e4c3c8b6d --- /dev/null +++ b/lib/public_key/src/pubkey_crl.erl @@ -0,0 +1,701 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2010-2012. 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% +%% + +-module(pubkey_crl). + +-include("public_key.hrl"). + +-export([validate/7, init_revokation_state/0, fresh_crl/3, verify_crl_signature/4, + is_delta_crl/1, combines/2, match_one/2]). + +-record(userstate, {dpcrls, + idp + }). + +validate(OtpCert, OtherDPCRLs, DP, {DerCRL, CRL}, {DerDeltaCRL, DeltaCRL}, + Options, RevokedState0) -> + RevokedState = + case verify_crl(OtpCert, DP, CRL, DerCRL, DeltaCRL, + DerDeltaCRL, OtherDPCRLs, Options, RevokedState0) of + {valid, Revoked, DeltaRevoked, RevokedState1, IDP} -> + TBSCert = OtpCert#'OTPCertificate'.tbsCertificate, + SerialNumber = TBSCert#'OTPTBSCertificate'.serialNumber, + CertIssuer = TBSCert#'OTPTBSCertificate'.issuer, + TBSCRL = CRL#'CertificateList'.tbsCertList, + CRLIssuer = TBSCRL#'TBSCertList'.issuer, + AltNames = subject_alt_names(TBSCert#'OTPTBSCertificate'.extensions), + revoked_status(DP, IDP, {directoryName, CRLIssuer}, + [ {directoryName, CertIssuer} | AltNames], SerialNumber, Revoked, + DeltaRevoked, RevokedState1); + {invalid, Revoked} -> + Revoked + end, + crl_status(RevokedState). + +init_revokation_state() -> + #revoke_state{reasons_mask = sets:new(), + interim_reasons_mask = sets:new(), + cert_status = unrevoked}. + +fresh_crl(_, {undefined, undefined}, _) -> + %% Typically happens when there is no delta CRL that covers a CRL + no_fresh_crl; + +fresh_crl(DP, {_, #'CertificateList'{tbsCertList = TBSCRL}} = CRL, CallBack) -> + Now = calendar:datetime_to_gregorian_seconds(calendar:universal_time()), + UpdateTime = + pubkey_cert:time_str_2_gregorian_sec(TBSCRL#'TBSCertList'.nextUpdate), + case Now >= UpdateTime of + true -> + case CallBack(DP, CRL) of + CRL -> + no_fresh_crl; + NewCRL -> + fresh_crl(DP, NewCRL, CallBack) + end; + false -> + {fresh, CRL} + end. + +is_delta_crl(#'CertificateList'{tbsCertList = TBSCRL}) -> + Extensions = TBSCRL#'TBSCertList'.crlExtensions, + case pubkey_cert:select_extension(?'id-ce-deltaCRLIndicator', + Extensions) of + undefined -> + false; + _ -> + true + end. + +combines(CRL, DeltaCRL) -> + check_crl_num(CRL, DeltaCRL) andalso + check_delta_issuer_and_scope(CRL, DeltaCRL). + +crl_status(State)-> + %% Fun argument is to enable future implementation of CRL checking + %% that does not care about all possible reasons. + crl_status(State, fun all_reasons/0). + +crl_status({skip, #revoke_state{cert_status = Status} = RevokedState}, _) -> + {undetermined, status(Status), RevokedState}; + +crl_status(#revoke_state{cert_status = unrevoked = Status, + valid_ext = false} = RevokedState, _) -> + {undetermined, Status, RevokedState}; + +crl_status(#revoke_state{cert_status = Status, + valid_ext = false}, _) -> + {finished, status(Status)}; + +crl_status(#revoke_state{reasons_mask = Mask, + cert_status = Status, + valid_ext = true} = RevokedState, Fun) -> + case is_all_reasons(Mask, Fun) of + true -> + {finished, status(Status)}; + false when (Status == unrevoked) -> + {undetermined, Status, RevokedState}; + _ -> + {finished ,status(Status)} + end. + +verify_crl(OtpCert, DP, CRL, DerCRL, DeltaCRL, DerDeltaCRL, OtherDPCRLs, + Options, State0) -> + #'CertificateList'{tbsCertList = + #'TBSCertList'{crlExtensions = Extensions, + revokedCertificates = TmpRevoked} + } = CRL, + Revoked = revoked(TmpRevoked), + IDP = issuing_distribution_point(Extensions), + + DeltaRevoked = delta_revoked(DeltaCRL), + + ValidExt = verify_extensions(Extensions) and + verify_extensions(Revoked), + + IntMask = compute_interim_reasons_mask(DP, IDP), + + RevokedState = + State0#revoke_state{interim_reasons_mask = IntMask, + valid_ext = ValidExt}, + + {Fun, AdditionalArgs} = IssuerFun = proplists:get_value(issuer_fun, Options), + + try verify_issuer_and_scope(OtpCert, DP, IDP, CRL) of + {ok, Issuer} -> + case Fun(DP, CRL, Issuer, AdditionalArgs) of + {ok, TrustedOtpCert, Path} -> + verify_mask_and_signatures(Revoked, DeltaRevoked, + RevokedState, + CRL, DerCRL, DeltaCRL, DerDeltaCRL, + IssuerFun, TrustedOtpCert, Path, OtherDPCRLs, IDP); + _ -> + {invalid, State0#revoke_state{valid_ext = ValidExt}} + end; + {error, issuer_not_found} -> + case Fun(DP, CRL, issuer_not_found, AdditionalArgs) of + {ok, TrustedOtpCert, Path} -> + verify_mask_and_signatures(Revoked, DeltaRevoked, + RevokedState, CRL, DerCRL, DeltaCRL, + DerDeltaCRL, IssuerFun, + TrustedOtpCert, Path, OtherDPCRLs, IDP); + _ -> + {invalid, {skip, State0}} + end + catch + throw:{bad_crl, invalid_issuer} -> + {invalid, {skip, State0}}; + throw:_ -> + {invalid, State0#revoke_state{valid_ext = ValidExt}} + end. + +verify_mask_and_signatures(Revoked, DeltaRevoked, RevokedState, CRL, DerCRL, DeltaCRL, DerDeltaCRL, + IssuerFun, TrustedOtpCert, Path, OtherDPCRLs, IDP) -> + + ReasonsMask = sets:union(RevokedState#revoke_state.reasons_mask, + RevokedState#revoke_state.interim_reasons_mask), + try + verify_interim_reasons_mask(RevokedState), + true = verify_crl_signatures(CRL, DerCRL, DeltaCRL, DerDeltaCRL, + TrustedOtpCert, Path, IssuerFun, OtherDPCRLs, IDP), + {valid, Revoked, DeltaRevoked, RevokedState#revoke_state{reasons_mask = ReasonsMask}, IDP} + catch + throw:_ -> + {invalid, RevokedState}; + error:{badmatch, _} -> + {invalid, RevokedState} + end. + + +verify_crl_signatures(CRL, DerCRL, DeltaCRL, DerDeltaCRL, TrustedOtpCert, Path, + IssuerFun, OtherDPCRLs, IDP) -> + try + VerifyFunAndState = + {fun(_, {bad_cert, _} = Reason, _UserState) -> + {fail, Reason}; + (_,{extension, _}, UserState) -> + {unknown, UserState}; + (_Cert, valid, UserState) -> + {valid, UserState}; + (Cert, valid_peer, UserState) -> + case verify_crl_keybit(Cert, cRLSign) of + true -> + handle_crlsigner(Cert, IssuerFun, UserState); + false -> + {fail, crl_sign_bit_not_set} + end + end, #userstate{dpcrls = OtherDPCRLs, idp = IDP}}, + + {ok, {{_,Key, KeyParams},_}} = + public_key:pkix_path_validation(TrustedOtpCert, Path, + [{verify_fun, VerifyFunAndState}]), + true = verify_crl_signature(CRL, DerCRL, Key, KeyParams), + true = verify_crl_signature(DeltaCRL, DerDeltaCRL, Key, KeyParams) + catch + error:{badmatch, _} -> + false + end. + +handle_crlsigner(OtpCert, IssuerFun, #userstate{idp = IDP} = UserState) -> + case verify_crl_keybit(OtpCert, keyCertSign) of + true -> + {valid, UserState}; + false -> + case not is_indirect_crl(IDP) andalso not public_key:pkix_is_self_signed(OtpCert) of + true -> + validate_crl_signing_cert(OtpCert, IssuerFun, UserState); + false -> + {valid, UserState} + end + end. + +validate_crl_signing_cert(_, _,#userstate{dpcrls = []} = UserState) -> + {valid, UserState}; +validate_crl_signing_cert(OtpCert, IssuerFun, #userstate{dpcrls = CRLInfo} = UserState) -> + case public_key:pkix_crls_validate(OtpCert, CRLInfo, [{issuer_fun, IssuerFun}]) of + valid -> + {valid, UserState}; + Reason -> + {fail, Reason} + end. + +delta_revoked(undefined)-> + []; +delta_revoked(#'CertificateList'{tbsCertList = + #'TBSCertList'{revokedCertificates + = DeltaRevoked}}) -> + revoked(DeltaRevoked). + +revoked(asn1_NOVALUE) -> + []; +revoked(Revoked) -> + Revoked. + +revoked_status(DP, IDP, CRLIssuer, Names, SerialNumber, Revoked, DeltaRevoked, RevokedState0) -> + DefaultIssuer0 = default_issuer(CRLIssuer, DeltaRevoked), + RevokedState1 = check_revoked(DP, IDP, DefaultIssuer0, Names, SerialNumber, DeltaRevoked, RevokedState0), + RevokedState = case RevokedState1#revoke_state.cert_status of + unrevoked when RevokedState1#revoke_state.cert_status =/= removeFromCRL -> + DefaultIssuer = default_issuer(CRLIssuer, Revoked), + check_revoked(DP, IDP, DefaultIssuer, Names, SerialNumber, + Revoked, RevokedState1); + _ -> + RevokedState1 + end, + case RevokedState#revoke_state.cert_status of + removeFromCRL -> + RevokedState#revoke_state{cert_status = unrevoked}; + _ -> + RevokedState + end. + +default_issuer(_, []) -> + undefined; +default_issuer(Default, [#'TBSCertList_revokedCertificates_SEQOF'{crlEntryExtensions = Extensions}| _]) -> + case extension_value(?'id-ce-certificateIssuer', 'GeneralNames', Extensions) of + undefined -> + [pubkey_cert_records:transform(Default, decode)]; + GeneralNames -> + gen_names(GeneralNames) + end. + +is_all_reasons(Mask, AllReasonsFun) -> + AllReasons = AllReasonsFun(), + case sets:is_subset(AllReasons, Mask) of + true -> + true; + false -> + %% As the "uspecified" reason should not + %% be explicitly used according to RFC 3280 + %% and the conformance tests have test cases + %% that should succed, and that does not specify + %% "unspecified", we tolorate that it is not included. + sets:is_subset(sets:del_element(unspecified, AllReasons), Mask) + end. + +all_reasons() -> + sets:from_list([unspecified, keyCompromise, + cACompromise, affiliationChanged, superseded, + cessationOfOperation, certificateHold, + privilegeWithdrawn, aACompromise]). + +verify_issuer_and_scope(#'OTPCertificate'{tbsCertificate = TBSCert} = Cert, + #'DistributionPoint'{cRLIssuer = DPIssuer} = DP, IDP, + #'CertificateList'{tbsCertList = TBSCRL} = CRL) + when DPIssuer =/= asn1_NOVALUE -> + CRLIssuer = pubkey_cert_records:transform(TBSCRL#'TBSCertList'.issuer, decode), + Issuer = dp_crlissuer_to_issuer(DPIssuer), + case pubkey_cert:is_issuer(Issuer, CRLIssuer) and is_indirect_crl(IDP) of + true -> + verify_scope(Cert, DP, IDP), + issuer_id(Cert, CRL); + false -> + %% otherwise verify that the CRL issuer matches the certificate issuer + verify_issuer_and_scope(Cert, DP#'DistributionPoint'{ + distributionPoint = [TBSCert#'OTPTBSCertificate'.issuer], + cRLIssuer = asn1_NOVALUE}, + IDP, CRL) + end; +verify_issuer_and_scope(#'OTPCertificate'{tbsCertificate = TBSCert}= Cert, + DP, IDP, + #'CertificateList'{tbsCertList = TBSCRL}) -> + CRLIssuer = pubkey_cert_records:transform(TBSCRL#'TBSCertList'.issuer, decode), + CertIssuer = TBSCert#'OTPTBSCertificate'.issuer, + case pubkey_cert:is_issuer(CertIssuer, CRLIssuer) of + true -> + verify_scope(Cert, DP, IDP), + issuer_id(Cert); + false -> + throw({bad_crl, invalid_issuer}) + end. + +dp_crlissuer_to_issuer(DPCRLIssuer) -> + [{directoryName, Issuer}] = pubkey_cert_records:transform(DPCRLIssuer, decode), + Issuer. + +is_indirect_crl(#'IssuingDistributionPoint'{indirectCRL = Value})-> + Value; +is_indirect_crl(_) -> + false. + +verify_scope(_,_, undefined) -> + ok; +verify_scope(#'OTPCertificate'{tbsCertificate = TBSCert}, #'DistributionPoint'{cRLIssuer = DPIssuer} = DP, IDP) -> + CertIssuer = TBSCert#'OTPTBSCertificate'.issuer, + Names = case gen_names(DPIssuer) of + [{directoryName, TNames}] -> + TNames; + Other -> + Other + end, + DPName = dp_names(DP#'DistributionPoint'.distributionPoint, Names, CertIssuer), + IDPName = dp_names(IDP#'IssuingDistributionPoint'.distributionPoint, Names, CertIssuer), + verify_scope(DPName, IDPName, Names, TBSCert, IDP). + +verify_scope(asn1_NOVALUE, _, asn1_NOVALUE, _, _) -> + throw({bad_crl, scope_error1}); +verify_scope(asn1_NOVALUE, IDPName, DPIssuerNames, TBSCert, IDP) -> + verify_dp_name(IDPName, DPIssuerNames), + verify_dp_bools(TBSCert, IDP); + +verify_scope(DPName, IDPName, _, TBSCert, IDP) -> + verify_dp_name(IDPName, DPName), + verify_dp_bools(TBSCert, IDP). + +dp_names(asn1_NOVALUE, _, _) -> + asn1_NOVALUE; +dp_names({fullName, Name}, _, _) -> + gen_names(Name); +dp_names({nameRelativeToCRLIssuer, Fragment}, asn1_NOVALUE, {rdnSequence, RelativeDestinguistNames}) -> + [{directoryName, {rdnSequence, RelativeDestinguistNames ++ + [lists:map(fun(AttrAndValue) -> + pubkey_cert_records:transform(AttrAndValue, decode) + end, Fragment)]}}]; +dp_names({nameRelativeToCRLIssuer, Fragment},{rdnSequence, RelativeDestinguistNames}, _) -> + [{directoryName, {rdnSequence, RelativeDestinguistNames ++ + [lists:map(fun(AttrAndValue) -> + pubkey_cert_records:transform(AttrAndValue, decode) + end, Fragment)]}}]; +dp_names([{rdnSequence, _}] = Name0, _,_) -> + [Name] = pubkey_cert_records:transform(Name0, decode), + [{directoryName, Name}]. + +gen_names(asn1_NOVALUE) -> + asn1_NOVALUE; +gen_names([]) -> + []; +gen_names([{NameType, Name} | Rest]) -> + [ {NameType, pubkey_cert_records:transform(Name, decode)} | gen_names(Rest)]. + +verify_dp_name(asn1_NOVALUE, _) -> + ok; + +verify_dp_name(IDPNames, DPorIssuerNames) -> + case match_one(DPorIssuerNames, IDPNames) of + true -> + ok; + false -> + throw({bad_crl, scope_error}) + end. + +match_one([], _) -> + false; +match_one([{Type, Name} | Names], CandidateNames) -> + Candidates = [NameName || {NameType, NameName} <- CandidateNames, NameType == Type], + case Candidates of + [] -> + false; + [_|_] -> case pubkey_cert:match_name(Type, Name, Candidates) of + true -> + true; + false -> + match_one(Names, CandidateNames) + end + end. + +verify_dp_bools(TBSCert, IDP) -> + BasicConstraints = + pubkey_cert:select_extension(?'id-ce-basicConstraints', + TBSCert#'OTPTBSCertificate'.extensions), + + case verify_onlyContainsUserCerts(BasicConstraints, IDP) andalso + verify_onlyContainsCACerts(BasicConstraints, IDP) andalso + verify_onlyContainsAttributeCerts(IDP) of + true -> + ok; + _ -> + throw({bad_crl, scope_error}) + end. + +verify_onlyContainsUserCerts( + #'Extension'{extnValue = #'BasicConstraints'{cA = true}}, + #'IssuingDistributionPoint'{onlyContainsUserCerts = true}) -> + false; +verify_onlyContainsUserCerts(_,_) -> + true. + +verify_onlyContainsCACerts( + #'Extension'{extnValue = #'BasicConstraints'{cA = true}}, + #'IssuingDistributionPoint'{onlyContainsCACerts = true}) -> + true; +verify_onlyContainsCACerts(_,#'IssuingDistributionPoint'{onlyContainsCACerts = true}) -> + false; +verify_onlyContainsCACerts(_,_) -> + true. + +verify_onlyContainsAttributeCerts( + #'IssuingDistributionPoint'{onlyContainsAttributeCerts = Bool}) -> + not Bool. + +check_crl_num(#'CertificateList'{tbsCertList = TBSCRL}, + #'CertificateList'{tbsCertList = TBSDeltaCRL})-> + Extensions = TBSCRL#'TBSCertList'.crlExtensions, + DeltaExtensions = TBSDeltaCRL#'TBSCertList'.crlExtensions, + + try + CRLNum = assert_extension_value(?'id-ce-cRLNumber', 'CRLNumber', Extensions), + DeltaBaseNum = assert_extension_value(?'id-ce-deltaCRLIndicator', + 'CRLNumber', DeltaExtensions), + DeltaCRLNum = assert_extension_value(?'id-ce-cRLNumber', 'CRLNumber', DeltaExtensions), + (CRLNum >= DeltaBaseNum) andalso (CRLNum < DeltaCRLNum) + catch + throw:no_extension_present -> + false + end; +check_crl_num(_,_) -> + false. + + +extension_value(Extension, ExtType, Extensions) -> + case pubkey_cert:select_extension(Extension, Extensions) of + #'Extension'{extnValue = Value} -> + public_key:der_decode(ExtType, list_to_binary(Value)); + _ -> + undefined + end. + + +assert_extension_value(Extension, ExtType, Extensions) -> + case extension_value(Extension, ExtType, Extensions) of + undefined -> + throw(no_extension_present); + Value -> + Value + end. + +check_delta_issuer_and_scope(_, undefined) -> + true; +check_delta_issuer_and_scope(#'CertificateList'{tbsCertList = TBSCRL}, + #'CertificateList'{tbsCertList = TBSDeltaCRL}) -> + case pubkey_cert:is_issuer(TBSCRL#'TBSCertList'.issuer, + TBSDeltaCRL#'TBSCertList'.issuer) of + true -> + check_delta_scope(TBSCRL, TBSDeltaCRL); + false -> + false + end. + +check_delta_scope(#'TBSCertList'{crlExtensions = Extensions}, + #'TBSCertList'{crlExtensions = DeltaExtensions})-> + IDP = issuing_distribution_point(Extensions), + DeltaIDP = issuing_distribution_point(DeltaExtensions), + + AuthKey = authority_key_identifier(Extensions), + DeltaAuthKey = authority_key_identifier(DeltaExtensions), + is_match(IDP, DeltaIDP) andalso is_match(AuthKey, DeltaAuthKey). + +is_match(X, X) -> + true; +is_match(_,_) -> + false. + +compute_interim_reasons_mask(#'DistributionPoint'{reasons = asn1_NOVALUE}, + #'IssuingDistributionPoint'{onlySomeReasons = + asn1_NOVALUE}) -> + all_reasons(); +compute_interim_reasons_mask(#'DistributionPoint'{reasons = asn1_NOVALUE}, + undefined) -> + all_reasons(); + +compute_interim_reasons_mask(#'DistributionPoint'{reasons = asn1_NOVALUE}, + #'IssuingDistributionPoint'{onlySomeReasons = + IDPReasons}) -> + sets:from_list(IDPReasons); +compute_interim_reasons_mask(#'DistributionPoint'{reasons = DPReasons}, + #'IssuingDistributionPoint'{onlySomeReasons = + asn1_NOVALUE}) -> + sets:from_list(DPReasons); +compute_interim_reasons_mask(#'DistributionPoint'{reasons = DPReasons}, + undefined) -> + sets:from_list(DPReasons); +compute_interim_reasons_mask(#'DistributionPoint'{reasons = DPReasons}, + #'IssuingDistributionPoint'{onlySomeReasons = + IDPReasons}) -> + sets:intersection(sets:from_list(DPReasons), sets:from_list(IDPReasons)). + +verify_interim_reasons_mask(#revoke_state{reasons_mask = Mask, + interim_reasons_mask = IntMask}) -> + case sets:fold(fun(Element, Acc) -> + case sets:is_element(Element, Mask) of + true -> + Acc; + false -> + true + end + end, false, IntMask) of + true -> + ok; + false -> + throw({bad_crl, mask_error}) + end. + +verify_crl_signature(undefined, undefined, _,_) -> + true; +verify_crl_signature(CRL, DerCRL, Key, KeyParams) -> + {DigestType, PlainText, Signature} = extract_crl_verify_data(CRL, DerCRL), + case Key of + #'RSAPublicKey'{} -> + public_key:verify(PlainText, DigestType, Signature, Key); + _ -> + public_key:verify(PlainText, DigestType, Signature, + {Key, KeyParams}) + end. +extract_crl_verify_data(CRL, DerCRL) -> + {0, Signature} = CRL#'CertificateList'.signature, + #'AlgorithmIdentifier'{algorithm = SigAlg} = + CRL#'CertificateList'.signatureAlgorithm, + PlainText = encoded_tbs_crl(DerCRL), + DigestType = pubkey_cert:digest_type(SigAlg), + {DigestType, PlainText, Signature}. + +encoded_tbs_crl(CRL) -> + {ok, PKIXCRL} = + 'OTP-PUB-KEY':decode_TBSCertList_exclusive(CRL), + {'CertificateList', + {'CertificateList_tbsCertList', EncodedTBSCertList}, _, _} = PKIXCRL, + EncodedTBSCertList. + +check_revoked(_,_,_,_,_,[], State) -> + State; +check_revoked(#'DistributionPoint'{cRLIssuer = DPIssuer} = DP, IDP, DefaultIssuer0, Names, SerialNr, + [#'TBSCertList_revokedCertificates_SEQOF'{userCertificate = + SerialNr, + crlEntryExtensions = + Extensions}| Rest], + State) -> + Reason = revoked_reason(Extensions), + case (DPIssuer =/= asn1_NOVALUE) and is_indirect_crl(IDP) of + true -> + handle_indirect_crl_check(DP, IDP, DefaultIssuer0, Names, SerialNr, Extensions, Reason, Rest, State); + false -> + State#revoke_state{cert_status = Reason} + end; + +check_revoked(DP, IDP, DefaultIssuer0, Names, SerialNr, + [#'TBSCertList_revokedCertificates_SEQOF'{crlEntryExtensions = + Extensions}| Rest], State) -> + DefaultIssuer = case extension_value(?'id-ce-certificateIssuer', 'GeneralNames', Extensions) of + undefined -> + DefaultIssuer0; + GeneralNames -> + gen_names(GeneralNames) + end, + check_revoked(DP, IDP, DefaultIssuer, Names, SerialNr, Rest, State). + +handle_indirect_crl_check(DP, IDP, DefaultIssuer0, Names, SerialNr, Extensions, Reason, Rest, State) -> + case check_crl_issuer_extension(Names, Extensions, DefaultIssuer0) of + {true, _} -> + State#revoke_state{cert_status = Reason}; + {false, DefaultIssuer} -> + check_revoked(DP, IDP, DefaultIssuer, Names, SerialNr, Rest, State) + end. + +check_crl_issuer_extension(Names, Extensions, Default0) -> + case extension_value(?'id-ce-certificateIssuer', 'GeneralNames', Extensions) of + undefined -> + {match_one(Default0, Names), Default0}; + GeneralNames -> + Default = gen_names(GeneralNames), + {match_one(Default, Names), Default} + end. + +revoked_reason(Extensions) -> + case extension_value(?'id-ce-cRLReasons', 'CRLReason', Extensions) of + undefined -> + unspecified; + Value -> + Value + end. + +verify_crl_keybit(#'OTPCertificate'{tbsCertificate = TBS}, Bit) -> + case pubkey_cert:select_extension( ?'id-ce-keyUsage', + TBS#'OTPTBSCertificate'.extensions) of + #'Extension'{extnID = ?'id-ce-keyUsage', + extnValue = KeyUse} -> + lists:member(Bit, KeyUse); + _ -> + true + end. + +issuer_id(Cert, #'CertificateList'{tbsCertList = TBSCRL}) -> + Extensions = + pubkey_cert:extensions_list(TBSCRL#'TBSCertList'.crlExtensions), + case authority_key_identifier(Extensions) of + undefined -> + issuer_id(Cert); + #'AuthorityKeyIdentifier'{authorityCertIssuer = asn1_NOVALUE, + authorityCertSerialNumber = asn1_NOVALUE} -> + issuer_id(Cert); + #'AuthorityKeyIdentifier'{authorityCertIssuer = Issuer, + authorityCertSerialNumber = Nr} -> + {ok, {Nr, Issuer}} + end. + +issuer_id(#'OTPCertificate'{} = Cert) -> + case public_key:pkix_is_self_signed(Cert) of + true -> + public_key:pkix_issuer_id(Cert, self); + false -> + public_key:pkix_issuer_id(Cert, other) + end. + +status(unrevoked) -> + unrevoked; +status(Reason) -> + {revoked, Reason}. + +verify_extensions([#'TBSCertList_revokedCertificates_SEQOF'{crlEntryExtensions = Ext} | Rest]) -> + verify_extensions(pubkey_cert:extensions_list(Ext)) and verify_extensions(Rest); +verify_extensions([]) -> + true; +verify_extensions([#'Extension'{critical = true, extnID = Id} | Rest]) -> + case lists:member(Id, [?'id-ce-authorityKeyIdentifier', + ?'id-ce-issuerAltName', + ?'id-ce-cRLNumber', + ?'id-ce-certificateIssuer', + ?'id-ce-deltaCRLIndicator', + ?'id-ce-issuingDistributionPoint', + ?'id-ce-freshestCRL']) of + true -> + verify_extensions(Rest); + false -> + false + end; +verify_extensions([_Ext | Rest]) -> + verify_extensions(Rest). + +issuing_distribution_point(Extensions) -> + Enc = extension_value(?'id-ce-issuingDistributionPoint', + 'IssuingDistributionPoint', Extensions), + pubkey_cert_records:transform(Enc, decode). + +authority_key_identifier(Extensions) -> + Enc = extension_value(?'id-ce-authorityKeyIdentifier', + 'AuthorityKeyIdentifier', Extensions), + pubkey_cert_records:transform(Enc, decode). + +subject_alt_names(Extensions) -> + Enc = extension_value(?'id-ce-subjectAltName', + 'GeneralNames', Extensions), + case Enc of + undefined -> + []; + _ -> + pubkey_cert_records:transform(Enc, decode) + end. |