[6a3a178] | 1 | // Copyright 2018 Joyent, Inc.
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| 2 |
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| 3 | module.exports = {
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| 4 | read: read,
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| 5 | write: write
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| 6 | };
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| 7 |
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| 8 | var assert = require('assert-plus');
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| 9 | var Buffer = require('safer-buffer').Buffer;
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| 10 | var rfc4253 = require('./rfc4253');
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| 11 | var Key = require('../key');
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| 12 |
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| 13 | var errors = require('../errors');
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| 14 |
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| 15 | function read(buf, options) {
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| 16 | var lines = buf.toString('ascii').split(/[\r\n]+/);
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| 17 | var found = false;
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| 18 | var parts;
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| 19 | var si = 0;
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| 20 | while (si < lines.length) {
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| 21 | parts = splitHeader(lines[si++]);
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| 22 | if (parts &&
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| 23 | parts[0].toLowerCase() === 'putty-user-key-file-2') {
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| 24 | found = true;
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| 25 | break;
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| 26 | }
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| 27 | }
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| 28 | if (!found) {
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| 29 | throw (new Error('No PuTTY format first line found'));
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| 30 | }
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| 31 | var alg = parts[1];
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| 32 |
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| 33 | parts = splitHeader(lines[si++]);
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| 34 | assert.equal(parts[0].toLowerCase(), 'encryption');
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| 35 |
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| 36 | parts = splitHeader(lines[si++]);
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| 37 | assert.equal(parts[0].toLowerCase(), 'comment');
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| 38 | var comment = parts[1];
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| 39 |
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| 40 | parts = splitHeader(lines[si++]);
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| 41 | assert.equal(parts[0].toLowerCase(), 'public-lines');
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| 42 | var publicLines = parseInt(parts[1], 10);
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| 43 | if (!isFinite(publicLines) || publicLines < 0 ||
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| 44 | publicLines > lines.length) {
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| 45 | throw (new Error('Invalid public-lines count'));
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| 46 | }
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| 47 |
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| 48 | var publicBuf = Buffer.from(
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| 49 | lines.slice(si, si + publicLines).join(''), 'base64');
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| 50 | var keyType = rfc4253.algToKeyType(alg);
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| 51 | var key = rfc4253.read(publicBuf);
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| 52 | if (key.type !== keyType) {
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| 53 | throw (new Error('Outer key algorithm mismatch'));
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| 54 | }
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| 55 | key.comment = comment;
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| 56 | return (key);
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| 57 | }
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| 58 |
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| 59 | function splitHeader(line) {
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| 60 | var idx = line.indexOf(':');
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| 61 | if (idx === -1)
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| 62 | return (null);
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| 63 | var header = line.slice(0, idx);
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| 64 | ++idx;
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| 65 | while (line[idx] === ' ')
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| 66 | ++idx;
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| 67 | var rest = line.slice(idx);
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| 68 | return ([header, rest]);
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| 69 | }
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| 70 |
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| 71 | function write(key, options) {
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| 72 | assert.object(key);
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| 73 | if (!Key.isKey(key))
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| 74 | throw (new Error('Must be a public key'));
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| 75 |
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| 76 | var alg = rfc4253.keyTypeToAlg(key);
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| 77 | var buf = rfc4253.write(key);
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| 78 | var comment = key.comment || '';
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| 79 |
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| 80 | var b64 = buf.toString('base64');
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| 81 | var lines = wrap(b64, 64);
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| 82 |
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| 83 | lines.unshift('Public-Lines: ' + lines.length);
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| 84 | lines.unshift('Comment: ' + comment);
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| 85 | lines.unshift('Encryption: none');
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| 86 | lines.unshift('PuTTY-User-Key-File-2: ' + alg);
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| 87 |
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| 88 | return (Buffer.from(lines.join('\n') + '\n'));
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| 89 | }
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| 90 |
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| 91 | function wrap(txt, len) {
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| 92 | var lines = [];
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| 93 | var pos = 0;
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| 94 | while (pos < txt.length) {
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| 95 | lines.push(txt.slice(pos, pos + 64));
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| 96 | pos += 64;
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| 97 | }
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| 98 | return (lines);
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| 99 | }
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