pkcs1: recognize explicit curve parameters
Add support for explicit curve parameters according to RFC 3279. This allows an exploitation attempt of CVE-2020-0601 to be detected through the pkcs1.specifiedCurve_element filter name. Be aware though that the certificate is encrypted in TLS 1.3, so a negative match does not imply that no exploitation has happened. While these definitions are technically not part of PKCS #1, the PKIXAlgs module is part of the pkcs1 dissector for historical reasons. It probably makes sense splitting it into a separate pkixalgs dissector, but that would result in field name changes. Defer that for now. Bug: 16340 Change-Id: Ia9d47a8337d6246f52983460580310b12e5709cf Reviewed-on: https://code.wireshark.org/review/35986 Petri-Dish: Peter Wu <peter@lekensteyn.nl> Tested-by: Petri Dish Buildbot Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
This commit is contained in:
Peter Wu
Alexis La Goutte
parent
530e243c09
commit
aaad273ec1
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@ -298,19 +298,52 @@ Digest ::= OCTET STRING
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-- Parameters and Keys for both Restricted and Unrestricted EC
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ECParameters ::= CHOICE {
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namedCurve --CURVE.&id({NamedCurve}) -- OBJECT IDENTIFIER
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-- implicitCurve NULL
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-- implicitCurve MUST NOT be used in PKIX
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-- specifiedCurve SpecifiedCurve
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-- specifiedCurve MUST NOT be used in PKIX
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-- Details for specifiedCurve can be found in [X9.62]
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-- Any future additions to this CHOICE should be coordinated
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-- with ANSI X.9.
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specifiedCurve SpecifiedECDomain, -- From RFC 3279 / SEC 1
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namedCurve OBJECT IDENTIFIER
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-- implicitlyCA NULL
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-- Wireshark note: the PKIXAlgs-2009 module from RFC 5912 only allows
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-- namedCurve to be used. This ECParameters type is however a subset of
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-- the type defined in X9.62 and RFC 3279 which additionally defines
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-- 'specified' and 'implicitlyCA'. Since the explicitly specified curve
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-- parameters were spotted in the wild as part of exploiting CVE-2020-0601,
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-- we will include it here anyway. We do not include implicitlyCA, it does
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-- not appear to be supported by OpenSSL, unlike the other two fields.
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}
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-- If you need to be able to decode ANSI X.9 parameter structures,
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-- uncomment the implicitCurve and specifiedCurve above, and also
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-- uncomment the following:
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-- (WITH COMPONENTS {namedCurve PRESENT})
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(WITH COMPONENTS {namedCurve PRESENT})
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-- ECParameters from RFC 3279, but renamed to SpecifiedECDomain (RFC 5480).
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-- Adapted from https://tools.ietf.org/html/rfc3279#page-14
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SpecifiedECDomain ::= SEQUENCE {
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version ECPVer, -- version is always 1
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fieldID FieldID, -- identifies the finite field over
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-- which the curve is defined
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curve Curve, -- coefficients a and b of the
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-- elliptic curve
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base ECPoint, -- specifies the base point P
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-- on the elliptic curve
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order INTEGER, -- the order n of the base point
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cofactor INTEGER OPTIONAL -- The integer h = #E(Fq)/n
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}
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ECPVer ::= INTEGER {ecpVer1(1)}
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FieldID ::= SEQUENCE {
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fieldType OBJECT IDENTIFIER,
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parameters ANY DEFINED BY fieldType }
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Curve ::= SEQUENCE {
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a FieldElement,
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b FieldElement,
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seed BIT STRING OPTIONAL }
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FieldElement ::= OCTET STRING
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-- FieldID.parameters definitions, OIDs are listed in pkcs1.cnf
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-- https://tools.ietf.org/html/rfc3279#page-21
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Prime-p ::= INTEGER -- Finite field F(p), where p is an odd prime
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-- Sec 2.1.1.1 Named Curve
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@ -14,6 +14,12 @@ DigestInfo
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#.FIELD_RENAME
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#.FN_PARS FieldID/fieldType
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FN_VARIANT = _str VAL_PTR = &actx->external.direct_reference
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#.FN_BODY FieldID/parameters
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offset = call_ber_oid_callback(actx->external.direct_reference, tvb, offset, actx->pinfo, tree, NULL);
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#.REGISTER
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DSA-Params B "1.2.840.10040.4.1" "id-dsa"
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DomainParameters B "1.2.840.10046.2.1" "dhpublicnumber"
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@ -23,11 +29,11 @@ ECParameters B "1.3.132.1.12" "id-ecDH"
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ECParameters B "1.2.840.10045.2.13" "id-ecMQV"
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RSASSA-PSS-params B "1.2.840.113549.1.1.10" "id-RSASSA-PSS"
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HashAlgorithm B "1.2.840.113549.1.1.8" "id-mgf1"
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Prime-p B "1.2.840.10045.1.1" "prime-field"
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#.NO_EMIT
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DSAPublicKey
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DHPublicKey
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ECPoint
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DSA-Sig-Value
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ECDSA-Sig-Value
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@ -45,6 +45,7 @@ static int hf_pkcs1_KEA_Params_Id_PDU = -1; /* KEA_Params_Id */
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static int hf_pkcs1_HashAlgorithm_PDU = -1; /* HashAlgorithm */
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static int hf_pkcs1_RSASSA_PSS_params_PDU = -1; /* RSASSA_PSS_params */
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static int hf_pkcs1_ECParameters_PDU = -1; /* ECParameters */
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static int hf_pkcs1_Prime_p_PDU = -1; /* Prime_p */
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static int hf_pkcs1_modulus = -1; /* INTEGER */
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static int hf_pkcs1_publicExponent = -1; /* INTEGER */
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static int hf_pkcs1_digestAlgorithm = -1; /* DigestAlgorithmIdentifier */
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@ -60,7 +61,18 @@ static int hf_pkcs1_hashAlgorithm = -1; /* HashAlgorithm */
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static int hf_pkcs1_maskGenAlgorithm = -1; /* MaskGenAlgorithm */
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static int hf_pkcs1_saltLength = -1; /* INTEGER */
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static int hf_pkcs1_trailerField = -1; /* INTEGER */
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static int hf_pkcs1_specifiedCurve = -1; /* SpecifiedECDomain */
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static int hf_pkcs1_namedCurve = -1; /* OBJECT_IDENTIFIER */
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static int hf_pkcs1_version = -1; /* ECPVer */
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static int hf_pkcs1_fieldID = -1; /* FieldID */
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static int hf_pkcs1_curve = -1; /* Curve */
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static int hf_pkcs1_base = -1; /* ECPoint */
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static int hf_pkcs1_order = -1; /* INTEGER */
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static int hf_pkcs1_cofactor = -1; /* INTEGER */
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static int hf_pkcs1_fieldType = -1; /* T_fieldType */
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static int hf_pkcs1_parameters = -1; /* T_parameters */
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static int hf_pkcs1_a = -1; /* FieldElement */
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static int hf_pkcs1_b = -1; /* FieldElement */
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static int hf_pkcs1_r = -1; /* INTEGER */
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static int hf_pkcs1_s = -1; /* INTEGER */
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@ -78,6 +90,9 @@ static gint ett_pkcs1_DomainParameters = -1;
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static gint ett_pkcs1_ValidationParams = -1;
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static gint ett_pkcs1_RSASSA_PSS_params = -1;
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static gint ett_pkcs1_ECParameters = -1;
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static gint ett_pkcs1_SpecifiedECDomain = -1;
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static gint ett_pkcs1_FieldID = -1;
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static gint ett_pkcs1_Curve = -1;
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static gint ett_pkcs1_DSA_Sig_Value = -1;
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static gint ett_pkcs1_ECDSA_Sig_Value = -1;
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@ -255,6 +270,111 @@ dissect_pkcs1_RSASSA_PSS_params(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, in
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static int
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dissect_pkcs1_ECPoint(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
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offset = dissect_ber_octet_string(implicit_tag, actx, tree, tvb, offset, hf_index,
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NULL);
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return offset;
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}
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static const value_string pkcs1_ECPVer_vals[] = {
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{ 1, "ecpVer1" },
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{ 0, NULL }
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};
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static int
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dissect_pkcs1_ECPVer(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
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offset = dissect_ber_integer(implicit_tag, actx, tree, tvb, offset, hf_index,
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NULL);
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return offset;
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}
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static int
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dissect_pkcs1_T_fieldType(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
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offset = dissect_ber_object_identifier_str(implicit_tag, actx, tree, tvb, offset, hf_index, &actx->external.direct_reference);
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return offset;
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}
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static int
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dissect_pkcs1_T_parameters(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
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#line 21 "./asn1/pkcs1/pkcs1.cnf"
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offset = call_ber_oid_callback(actx->external.direct_reference, tvb, offset, actx->pinfo, tree, NULL);
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return offset;
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}
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static const ber_sequence_t FieldID_sequence[] = {
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{ &hf_pkcs1_fieldType , BER_CLASS_UNI, BER_UNI_TAG_OID, BER_FLAGS_NOOWNTAG, dissect_pkcs1_T_fieldType },
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{ &hf_pkcs1_parameters , BER_CLASS_ANY, 0, BER_FLAGS_NOOWNTAG, dissect_pkcs1_T_parameters },
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{ NULL, 0, 0, 0, NULL }
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};
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static int
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dissect_pkcs1_FieldID(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
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offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,
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FieldID_sequence, hf_index, ett_pkcs1_FieldID);
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return offset;
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}
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static int
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dissect_pkcs1_FieldElement(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
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offset = dissect_ber_octet_string(implicit_tag, actx, tree, tvb, offset, hf_index,
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NULL);
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return offset;
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}
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static const ber_sequence_t Curve_sequence[] = {
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{ &hf_pkcs1_a , BER_CLASS_UNI, BER_UNI_TAG_OCTETSTRING, BER_FLAGS_NOOWNTAG, dissect_pkcs1_FieldElement },
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{ &hf_pkcs1_b , BER_CLASS_UNI, BER_UNI_TAG_OCTETSTRING, BER_FLAGS_NOOWNTAG, dissect_pkcs1_FieldElement },
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{ &hf_pkcs1_seed , BER_CLASS_UNI, BER_UNI_TAG_BITSTRING, BER_FLAGS_OPTIONAL|BER_FLAGS_NOOWNTAG, dissect_pkcs1_BIT_STRING },
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{ NULL, 0, 0, 0, NULL }
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};
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static int
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dissect_pkcs1_Curve(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
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offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,
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Curve_sequence, hf_index, ett_pkcs1_Curve);
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return offset;
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}
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static const ber_sequence_t SpecifiedECDomain_sequence[] = {
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{ &hf_pkcs1_version , BER_CLASS_UNI, BER_UNI_TAG_INTEGER, BER_FLAGS_NOOWNTAG, dissect_pkcs1_ECPVer },
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{ &hf_pkcs1_fieldID , BER_CLASS_UNI, BER_UNI_TAG_SEQUENCE, BER_FLAGS_NOOWNTAG, dissect_pkcs1_FieldID },
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{ &hf_pkcs1_curve , BER_CLASS_UNI, BER_UNI_TAG_SEQUENCE, BER_FLAGS_NOOWNTAG, dissect_pkcs1_Curve },
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{ &hf_pkcs1_base , BER_CLASS_UNI, BER_UNI_TAG_OCTETSTRING, BER_FLAGS_NOOWNTAG, dissect_pkcs1_ECPoint },
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{ &hf_pkcs1_order , BER_CLASS_UNI, BER_UNI_TAG_INTEGER, BER_FLAGS_NOOWNTAG, dissect_pkcs1_INTEGER },
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{ &hf_pkcs1_cofactor , BER_CLASS_UNI, BER_UNI_TAG_INTEGER, BER_FLAGS_OPTIONAL|BER_FLAGS_NOOWNTAG, dissect_pkcs1_INTEGER },
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{ NULL, 0, 0, 0, NULL }
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};
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static int
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dissect_pkcs1_SpecifiedECDomain(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
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offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,
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SpecifiedECDomain_sequence, hf_index, ett_pkcs1_SpecifiedECDomain);
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return offset;
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}
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static int
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dissect_pkcs1_OBJECT_IDENTIFIER(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
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@ -265,12 +385,14 @@ dissect_pkcs1_OBJECT_IDENTIFIER(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, in
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static const value_string pkcs1_ECParameters_vals[] = {
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{ 0, "namedCurve" },
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{ 0, "specifiedCurve" },
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{ 1, "namedCurve" },
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{ 0, NULL }
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};
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static const ber_choice_t ECParameters_choice[] = {
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{ 0, &hf_pkcs1_namedCurve , BER_CLASS_UNI, BER_UNI_TAG_OID, BER_FLAGS_NOOWNTAG, dissect_pkcs1_OBJECT_IDENTIFIER },
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{ 0, &hf_pkcs1_specifiedCurve, BER_CLASS_UNI, BER_UNI_TAG_SEQUENCE, BER_FLAGS_NOOWNTAG, dissect_pkcs1_SpecifiedECDomain },
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{ 1, &hf_pkcs1_namedCurve , BER_CLASS_UNI, BER_UNI_TAG_OID, BER_FLAGS_NOOWNTAG, dissect_pkcs1_OBJECT_IDENTIFIER },
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{ 0, NULL, 0, 0, 0, NULL }
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};
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@ -285,6 +407,16 @@ dissect_pkcs1_ECParameters(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int off
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static int
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dissect_pkcs1_Prime_p(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
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offset = dissect_ber_integer(implicit_tag, actx, tree, tvb, offset, hf_index,
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NULL);
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return offset;
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}
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/*--- PDUs ---*/
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static int dissect_DSA_Params_PDU(tvbuff_t *tvb _U_, packet_info *pinfo _U_, proto_tree *tree _U_, void *data _U_) {
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@ -329,6 +461,13 @@ static int dissect_ECParameters_PDU(tvbuff_t *tvb _U_, packet_info *pinfo _U_, p
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offset = dissect_pkcs1_ECParameters(FALSE, tvb, offset, &asn1_ctx, tree, hf_pkcs1_ECParameters_PDU);
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return offset;
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}
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static int dissect_Prime_p_PDU(tvbuff_t *tvb _U_, packet_info *pinfo _U_, proto_tree *tree _U_, void *data _U_) {
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int offset = 0;
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asn1_ctx_t asn1_ctx;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
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offset = dissect_pkcs1_Prime_p(FALSE, tvb, offset, &asn1_ctx, tree, hf_pkcs1_Prime_p_PDU);
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return offset;
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}
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/*--- End of included file: packet-pkcs1-fn.c ---*/
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@ -366,6 +505,10 @@ void proto_register_pkcs1(void) {
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{ "ECParameters", "pkcs1.ECParameters",
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FT_UINT32, BASE_DEC, VALS(pkcs1_ECParameters_vals), 0,
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NULL, HFILL }},
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{ &hf_pkcs1_Prime_p_PDU,
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{ "Prime-p", "pkcs1.Prime_p",
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FT_INT32, BASE_DEC, NULL, 0,
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NULL, HFILL }},
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{ &hf_pkcs1_modulus,
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{ "modulus", "pkcs1.modulus",
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FT_BYTES, BASE_NONE, NULL, 0,
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@ -426,10 +569,54 @@ void proto_register_pkcs1(void) {
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{ "trailerField", "pkcs1.trailerField",
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FT_INT32, BASE_DEC, NULL, 0,
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"INTEGER", HFILL }},
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{ &hf_pkcs1_specifiedCurve,
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{ "specifiedCurve", "pkcs1.specifiedCurve_element",
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FT_NONE, BASE_NONE, NULL, 0,
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"SpecifiedECDomain", HFILL }},
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{ &hf_pkcs1_namedCurve,
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{ "namedCurve", "pkcs1.namedCurve",
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FT_OID, BASE_NONE, NULL, 0,
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"OBJECT_IDENTIFIER", HFILL }},
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{ &hf_pkcs1_version,
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{ "version", "pkcs1.version",
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FT_INT32, BASE_DEC, VALS(pkcs1_ECPVer_vals), 0,
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"ECPVer", HFILL }},
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{ &hf_pkcs1_fieldID,
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{ "fieldID", "pkcs1.fieldID_element",
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FT_NONE, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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{ &hf_pkcs1_curve,
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{ "curve", "pkcs1.curve_element",
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FT_NONE, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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{ &hf_pkcs1_base,
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{ "base", "pkcs1.base",
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FT_BYTES, BASE_NONE, NULL, 0,
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"ECPoint", HFILL }},
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{ &hf_pkcs1_order,
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{ "order", "pkcs1.order",
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FT_INT32, BASE_DEC, NULL, 0,
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"INTEGER", HFILL }},
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{ &hf_pkcs1_cofactor,
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{ "cofactor", "pkcs1.cofactor",
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FT_INT32, BASE_DEC, NULL, 0,
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"INTEGER", HFILL }},
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{ &hf_pkcs1_fieldType,
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{ "fieldType", "pkcs1.fieldType",
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FT_OID, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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{ &hf_pkcs1_parameters,
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{ "parameters", "pkcs1.parameters_element",
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FT_NONE, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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{ &hf_pkcs1_a,
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{ "a", "pkcs1.a",
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FT_BYTES, BASE_NONE, NULL, 0,
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"FieldElement", HFILL }},
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{ &hf_pkcs1_b,
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{ "b", "pkcs1.b",
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FT_BYTES, BASE_NONE, NULL, 0,
|
||||
"FieldElement", HFILL }},
|
||||
{ &hf_pkcs1_r,
|
||||
{ "r", "pkcs1.r",
|
||||
FT_INT32, BASE_DEC, NULL, 0,
|
||||
|
|
@ -455,6 +642,9 @@ void proto_register_pkcs1(void) {
|
|||
&ett_pkcs1_ValidationParams,
|
||||
&ett_pkcs1_RSASSA_PSS_params,
|
||||
&ett_pkcs1_ECParameters,
|
||||
&ett_pkcs1_SpecifiedECDomain,
|
||||
&ett_pkcs1_FieldID,
|
||||
&ett_pkcs1_Curve,
|
||||
&ett_pkcs1_DSA_Sig_Value,
|
||||
&ett_pkcs1_ECDSA_Sig_Value,
|
||||
|
||||
|
|
@ -485,6 +675,7 @@ void proto_reg_handoff_pkcs1(void) {
|
|||
register_ber_oid_dissector("1.2.840.10045.2.13", dissect_ECParameters_PDU, proto_pkcs1, "id-ecMQV");
|
||||
register_ber_oid_dissector("1.2.840.113549.1.1.10", dissect_RSASSA_PSS_params_PDU, proto_pkcs1, "id-RSASSA-PSS");
|
||||
register_ber_oid_dissector("1.2.840.113549.1.1.8", dissect_HashAlgorithm_PDU, proto_pkcs1, "id-mgf1");
|
||||
register_ber_oid_dissector("1.2.840.10045.1.1", dissect_Prime_p_PDU, proto_pkcs1, "prime-field");
|
||||
|
||||
|
||||
/*--- End of included file: packet-pkcs1-dis-tab.c ---*/
|
||||
|
|
|
|||
Loading…
Reference in New Issue