auto.js (3434B)
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 utils = require('../utils'); 11 var Key = require('../key'); 12 var PrivateKey = require('../private-key'); 13 14 var pem = require('./pem'); 15 var ssh = require('./ssh'); 16 var rfc4253 = require('./rfc4253'); 17 var dnssec = require('./dnssec'); 18 var putty = require('./putty'); 19 20 var DNSSEC_PRIVKEY_HEADER_PREFIX = 'Private-key-format: v1'; 21 22 function read(buf, options) { 23 if (typeof (buf) === 'string') { 24 if (buf.trim().match(/^[-]+[ ]*BEGIN/)) 25 return (pem.read(buf, options)); 26 if (buf.match(/^\s*ssh-[a-z]/)) 27 return (ssh.read(buf, options)); 28 if (buf.match(/^\s*ecdsa-/)) 29 return (ssh.read(buf, options)); 30 if (buf.match(/^putty-user-key-file-2:/i)) 31 return (putty.read(buf, options)); 32 if (findDNSSECHeader(buf)) 33 return (dnssec.read(buf, options)); 34 buf = Buffer.from(buf, 'binary'); 35 } else { 36 assert.buffer(buf); 37 if (findPEMHeader(buf)) 38 return (pem.read(buf, options)); 39 if (findSSHHeader(buf)) 40 return (ssh.read(buf, options)); 41 if (findPuTTYHeader(buf)) 42 return (putty.read(buf, options)); 43 if (findDNSSECHeader(buf)) 44 return (dnssec.read(buf, options)); 45 } 46 if (buf.readUInt32BE(0) < buf.length) 47 return (rfc4253.read(buf, options)); 48 throw (new Error('Failed to auto-detect format of key')); 49 } 50 51 function findPuTTYHeader(buf) { 52 var offset = 0; 53 while (offset < buf.length && 54 (buf[offset] === 32 || buf[offset] === 10 || buf[offset] === 9)) 55 ++offset; 56 if (offset + 22 <= buf.length && 57 buf.slice(offset, offset + 22).toString('ascii').toLowerCase() === 58 'putty-user-key-file-2:') 59 return (true); 60 return (false); 61 } 62 63 function findSSHHeader(buf) { 64 var offset = 0; 65 while (offset < buf.length && 66 (buf[offset] === 32 || buf[offset] === 10 || buf[offset] === 9)) 67 ++offset; 68 if (offset + 4 <= buf.length && 69 buf.slice(offset, offset + 4).toString('ascii') === 'ssh-') 70 return (true); 71 if (offset + 6 <= buf.length && 72 buf.slice(offset, offset + 6).toString('ascii') === 'ecdsa-') 73 return (true); 74 return (false); 75 } 76 77 function findPEMHeader(buf) { 78 var offset = 0; 79 while (offset < buf.length && 80 (buf[offset] === 32 || buf[offset] === 10)) 81 ++offset; 82 if (buf[offset] !== 45) 83 return (false); 84 while (offset < buf.length && 85 (buf[offset] === 45)) 86 ++offset; 87 while (offset < buf.length && 88 (buf[offset] === 32)) 89 ++offset; 90 if (offset + 5 > buf.length || 91 buf.slice(offset, offset + 5).toString('ascii') !== 'BEGIN') 92 return (false); 93 return (true); 94 } 95 96 function findDNSSECHeader(buf) { 97 // private case first 98 if (buf.length <= DNSSEC_PRIVKEY_HEADER_PREFIX.length) 99 return (false); 100 var headerCheck = buf.slice(0, DNSSEC_PRIVKEY_HEADER_PREFIX.length); 101 if (headerCheck.toString('ascii') === DNSSEC_PRIVKEY_HEADER_PREFIX) 102 return (true); 103 104 // public-key RFC3110 ? 105 // 'domain.com. IN KEY ...' or 'domain.com. IN DNSKEY ...' 106 // skip any comment-lines 107 if (typeof (buf) !== 'string') { 108 buf = buf.toString('ascii'); 109 } 110 var lines = buf.split('\n'); 111 var line = 0; 112 /* JSSTYLED */ 113 while (lines[line].match(/^\;/)) 114 line++; 115 if (lines[line].toString('ascii').match(/\. IN KEY /)) 116 return (true); 117 if (lines[line].toString('ascii').match(/\. IN DNSKEY /)) 118 return (true); 119 return (false); 120 } 121 122 function write(key, options) { 123 throw (new Error('"auto" format cannot be used for writing')); 124 }