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JavaScript generic ASN.1 parser (mirror)
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139// ASN.1 RFC definitions matcher// Copyright (c) 2023-2024 Lapo Luchini <lapo@lapo.it>
// Permission to use, copy, modify, and/or distribute this software for any// purpose with or without fee is hereby granted, provided that the above// copyright notice and this permission notice appear in all copies.// // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
import { rfcdef } from './rfcdef.js';
function translate(def, tn, stats) { if (def?.type == 'tag' && !def.explicit) // def.type = def.content[0].type; def = def.content[0].type; if (def?.definedBy) try { // hope current OIDs contain the type name (will need to parse from RFC itself) def = Defs.searchType(firstUpper(stats.defs[def.definedBy][1])); } catch (e) { /*ignore*/ } while (def?.type == 'defined' || def?.type?.type == 'defined') { const name = def?.type?.type ? def.type.name : def.name; def = Object.assign({}, def); def.type = Defs.searchType(name).type; } if (def?.type?.name == 'CHOICE') { for (let c of def.type.content) { if (tn != c.type.name && tn != c.name) c = translate(c); if (tn == c.type.name || tn == c.name) { def = Object.assign({}, def); def.type = c.type.name ? c.type : c; break; } } } const id = def?.id; if (id) def = Object.assign({}, def, { id }); return def ?? { type: {} };}
function firstUpper(s) { return s[0].toUpperCase() + s.slice(1);}
export class Defs {
static moduleAndType(mod, name) { return Object.assign({ module: { oid: mod.oid, name: mod.name, source: mod.source } }, mod.types[name]); }
static searchType(name) { for (const mod of Object.values(rfcdef)) if (name in mod.types) { // console.log(name + ' found in ' + r.name); // return r.types[name]; return Defs.moduleAndType(mod, name); } throw new Error('Type not found: ' + name); }
static match(value, def, stats = { total: 0, recognized: 0, defs: {} }) { value.def = {}; let tn = value.typeName().replaceAll('_', ' '); def = translate(def, tn, stats); ++stats.total; if (def?.type) { // if (def.id || def.name) ++stats.recognized; if (tn == def.type.name || tn == def.name || def.name == 'ANY') ++stats.recognized; else if (def.name) def = Object.assign({ mismatch: 1 }, def); value.def = def; } if (value.sub !== null) { if (def?.type?.type) def = def.type; let j = def?.content ? 0 : -1; for (const subval of value.sub) { let type; if (j >= 0) { if (def.typeOf) type = def.content[0]; else { let tn = subval.typeName().replaceAll('_', ' '); for (;;) { type = def.content[j++]; if (!type || typeof type != 'object') break; if (type?.type?.type) type = type.type; if (type.type == 'defined') { let t2 = translate(type, tn); if (t2.type.name == tn) break; // exact match if (t2.type.name == 'ANY') break; // good enough } if (type.name == tn) break; // exact match if (type.name == 'ANY') break; // good enough if (!('optional' in type || 'default' in type)) break; } if (type?.type == 'builtin' || type?.type == 'defined') { let v = subval.content(); if (typeof v == 'string') v = v.split(/\n/); stats.defs[type.id] = v; } else if (type?.definedBy && stats.defs?.[type.definedBy]?.[1]) { // hope current OIDs contain the type name (will need to parse from RFC itself) try { type = Defs.searchType(firstUpper(stats.defs[type.definedBy][1])); } catch (e) { /*ignore*/ } } } } Defs.match(subval, type, stats); } } return stats; }
}
Defs.RFC = rfcdef;
Defs.commonTypes = [ [ 'X.509 certificate', '1.3.6.1.5.5.7.0.18', 'Certificate' ], [ 'X.509 public key info', '1.3.6.1.5.5.7.0.18', 'SubjectPublicKeyInfo' ], [ 'CMS / PKCS#7 envelope', '1.2.840.113549.1.9.16.0.14', 'ContentInfo' ], [ 'PKCS#1 RSA private key', '1.2.840.113549.1.1.0.1', 'RSAPrivateKey' ], [ 'PKCS#8 encrypted private key', '1.2.840.113549.1.8.1.1', 'EncryptedPrivateKeyInfo' ], [ 'PKCS#8 private key', '1.2.840.113549.1.8.1.1', 'PrivateKeyInfo' ], [ 'PKCS#10 certification request', '1.2.840.113549.1.10.1.1', 'CertificationRequest' ], [ 'CMP PKI Message', '1.3.6.1.5.5.7.0.16', 'PKIMessage' ],].map(arr => ({ description: arr[0], ...Defs.moduleAndType(rfcdef[arr[1]], arr[2]) }));