You need to sign in or sign up before continuing.
identity.js 7.24 KB
Newer Older
nittaya chompoosan's avatar
nittaya chompoosan committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277
// Copyright 2017 Joyent, Inc.

module.exports = Identity;

var assert = require('assert-plus');
var algs = require('./algs');
var crypto = require('crypto');
var Fingerprint = require('./fingerprint');
var Signature = require('./signature');
var errs = require('./errors');
var util = require('util');
var utils = require('./utils');
var asn1 = require('asn1');

/*JSSTYLED*/
var DNS_NAME_RE = /^([*]|[a-z0-9][a-z0-9\-]{0,62})(?:\.([*]|[a-z0-9][a-z0-9\-]{0,62}))*$/i;

var oids = {};
oids.cn = '2.5.4.3';
oids.o = '2.5.4.10';
oids.ou = '2.5.4.11';
oids.l = '2.5.4.7';
oids.s = '2.5.4.8';
oids.c = '2.5.4.6';
oids.sn = '2.5.4.4';
oids.dc = '0.9.2342.19200300.100.1.25';
oids.uid = '0.9.2342.19200300.100.1.1';
oids.mail = '0.9.2342.19200300.100.1.3';

var unoids = {};
Object.keys(oids).forEach(function (k) {
	unoids[oids[k]] = k;
});

function Identity(opts) {
	var self = this;
	assert.object(opts, 'options');
	assert.arrayOfObject(opts.components, 'options.components');
	this.components = opts.components;
	this.componentLookup = {};
	this.components.forEach(function (c) {
		if (c.name && !c.oid)
			c.oid = oids[c.name];
		if (c.oid && !c.name)
			c.name = unoids[c.oid];
		if (self.componentLookup[c.name] === undefined)
			self.componentLookup[c.name] = [];
		self.componentLookup[c.name].push(c);
	});
	if (this.componentLookup.cn && this.componentLookup.cn.length > 0) {
		this.cn = this.componentLookup.cn[0].value;
	}
	assert.optionalString(opts.type, 'options.type');
	if (opts.type === undefined) {
		if (this.components.length === 1 &&
		    this.componentLookup.cn &&
		    this.componentLookup.cn.length === 1 &&
		    this.componentLookup.cn[0].value.match(DNS_NAME_RE)) {
			this.type = 'host';
			this.hostname = this.componentLookup.cn[0].value;

		} else if (this.componentLookup.dc &&
		    this.components.length === this.componentLookup.dc.length) {
			this.type = 'host';
			this.hostname = this.componentLookup.dc.map(
			    function (c) {
				return (c.value);
			}).join('.');

		} else if (this.componentLookup.uid &&
		    this.components.length ===
		    this.componentLookup.uid.length) {
			this.type = 'user';
			this.uid = this.componentLookup.uid[0].value;

		} else if (this.componentLookup.cn &&
		    this.componentLookup.cn.length === 1 &&
		    this.componentLookup.cn[0].value.match(DNS_NAME_RE)) {
			this.type = 'host';
			this.hostname = this.componentLookup.cn[0].value;

		} else if (this.componentLookup.uid &&
		    this.componentLookup.uid.length === 1) {
			this.type = 'user';
			this.uid = this.componentLookup.uid[0].value;

		} else if (this.componentLookup.mail &&
		    this.componentLookup.mail.length === 1) {
			this.type = 'email';
			this.email = this.componentLookup.mail[0].value;

		} else if (this.componentLookup.cn &&
		    this.componentLookup.cn.length === 1) {
			this.type = 'user';
			this.uid = this.componentLookup.cn[0].value;

		} else {
			this.type = 'unknown';
		}
	} else {
		this.type = opts.type;
		if (this.type === 'host')
			this.hostname = opts.hostname;
		else if (this.type === 'user')
			this.uid = opts.uid;
		else if (this.type === 'email')
			this.email = opts.email;
		else
			throw (new Error('Unknown type ' + this.type));
	}
}

Identity.prototype.toString = function () {
	return (this.components.map(function (c) {
		return (c.name.toUpperCase() + '=' + c.value);
	}).join(', '));
};

/*
 * These are from X.680 -- PrintableString allowed chars are in section 37.4
 * table 8. Spec for IA5Strings is "1,6 + SPACE + DEL" where 1 refers to
 * ISO IR #001 (standard ASCII control characters) and 6 refers to ISO IR #006
 * (the basic ASCII character set).
 */
/* JSSTYLED */
var NOT_PRINTABLE = /[^a-zA-Z0-9 '(),+.\/:=?-]/;
/* JSSTYLED */
var NOT_IA5 = /[^\x00-\x7f]/;

Identity.prototype.toAsn1 = function (der, tag) {
	der.startSequence(tag);
	this.components.forEach(function (c) {
		der.startSequence(asn1.Ber.Constructor | asn1.Ber.Set);
		der.startSequence();
		der.writeOID(c.oid);
		/*
		 * If we fit in a PrintableString, use that. Otherwise use an
		 * IA5String or UTF8String.
		 */
		if (c.value.match(NOT_IA5)) {
			var v = new Buffer(c.value, 'utf8');
			der.writeBuffer(v, asn1.Ber.Utf8String);
		} else if (c.value.match(NOT_PRINTABLE)) {
			der.writeString(c.value, asn1.Ber.IA5String);
		} else {
			der.writeString(c.value, asn1.Ber.PrintableString);
		}
		der.endSequence();
		der.endSequence();
	});
	der.endSequence();
};

function globMatch(a, b) {
	if (a === '**' || b === '**')
		return (true);
	var aParts = a.split('.');
	var bParts = b.split('.');
	if (aParts.length !== bParts.length)
		return (false);
	for (var i = 0; i < aParts.length; ++i) {
		if (aParts[i] === '*' || bParts[i] === '*')
			continue;
		if (aParts[i] !== bParts[i])
			return (false);
	}
	return (true);
}

Identity.prototype.equals = function (other) {
	if (!Identity.isIdentity(other, [1, 0]))
		return (false);
	if (other.components.length !== this.components.length)
		return (false);
	for (var i = 0; i < this.components.length; ++i) {
		if (this.components[i].oid !== other.components[i].oid)
			return (false);
		if (!globMatch(this.components[i].value,
		    other.components[i].value)) {
			return (false);
		}
	}
	return (true);
};

Identity.forHost = function (hostname) {
	assert.string(hostname, 'hostname');
	return (new Identity({
		type: 'host',
		hostname: hostname,
		components: [ { name: 'cn', value: hostname } ]
	}));
};

Identity.forUser = function (uid) {
	assert.string(uid, 'uid');
	return (new Identity({
		type: 'user',
		uid: uid,
		components: [ { name: 'uid', value: uid } ]
	}));
};

Identity.forEmail = function (email) {
	assert.string(email, 'email');
	return (new Identity({
		type: 'email',
		email: email,
		components: [ { name: 'mail', value: email } ]
	}));
};

Identity.parseDN = function (dn) {
	assert.string(dn, 'dn');
	var parts = dn.split(',');
	var cmps = parts.map(function (c) {
		c = c.trim();
		var eqPos = c.indexOf('=');
		var name = c.slice(0, eqPos).toLowerCase();
		var value = c.slice(eqPos + 1);
		return ({ name: name, value: value });
	});
	return (new Identity({ components: cmps }));
};

Identity.parseAsn1 = function (der, top) {
	var components = [];
	der.readSequence(top);
	var end = der.offset + der.length;
	while (der.offset < end) {
		der.readSequence(asn1.Ber.Constructor | asn1.Ber.Set);
		var after = der.offset + der.length;
		der.readSequence();
		var oid = der.readOID();
		var type = der.peek();
		var value;
		switch (type) {
		case asn1.Ber.PrintableString:
		case asn1.Ber.IA5String:
		case asn1.Ber.OctetString:
		case asn1.Ber.T61String:
			value = der.readString(type);
			break;
		case asn1.Ber.Utf8String:
			value = der.readString(type, true);
			value = value.toString('utf8');
			break;
		case asn1.Ber.CharacterString:
		case asn1.Ber.BMPString:
			value = der.readString(type, true);
			value = value.toString('utf16le');
			break;
		default:
			throw (new Error('Unknown asn1 type ' + type));
		}
		components.push({ oid: oid, value: value });
		der._offset = after;
	}
	der._offset = end;
	return (new Identity({
		components: components
	}));
};

Identity.isIdentity = function (obj, ver) {
	return (utils.isCompatible(obj, Identity, ver));
};

/*
 * API versions for Identity:
 * [1,0] -- initial ver
 */
Identity.prototype._sshpkApiVersion = [1, 0];

Identity._oldVersionDetect = function (obj) {
	return ([1, 0]);
};