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