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doc: describe certificate object properties
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PR-URL: #24358
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
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@sam-github @rvagg
sam-github authored and rvagg committed Nov 28, 2018
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128 changes: 69 additions & 59 deletions doc/api/tls.md
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Expand Up @@ -638,44 +638,84 @@ added: v0.11.4

* `detailed` {boolean} Include the full certificate chain if `true`, otherwise
include just the peer's certificate.
* Returns: {Object}
* Returns: {Object} A certificate object.

Returns an object representing the peer's certificate. The returned object has
some properties corresponding to the fields of the certificate.
Returns an object representing the peer's certificate. If the peer does not
provide a certificate, an empty object will be returned. If the socket has been
destroyed, `null` will be returned.

If the full certificate chain was requested, each certificate will include an
`issuerCertificate` property containing an object representing its issuer's
certificate.

#### Certificate Object

A certificate object has properties corresponding to the fields of the
certificate.

* `raw` {Buffer} The DER encoded X.509 certificate data.
* `subject` {Object} The certificate subject, described in terms of
Country (`C:`), StateOrProvince (`ST`), Locality (`L`), Organization (`O`),
OrganizationalUnit (`OU`), and CommonName (`CN`). The CommonName is typically
a DNS name with TLS certificates. Example:
`{C: 'UK', ST: 'BC', L: 'Metro', O: 'Node Fans', OU: 'Docs', CN: 'example.com'}`.
* `issuer` {Object} The certificate issuer, described in the same terms as the
`subject`.
* `valid_from` {string} The date-time the certificate is valid from.
* `valid_to` {string} The date-time the certificate is valid to.
* `serialNumber` {string} The certificate serial number, as a hex string.
Example: `'B9B0D332A1AA5635'`.
* `fingerprint` {string} The SHA-1 digest of the DER encoded certificate. It is
returned as a `:` separated hexadecimal string. Example: `'2A:7A:C2:DD:...'`.
* `fingerprint256` {string} The SHA-256 digest of the DER encoded certificate.
It is returned as a `:` separated hexadecimal string. Example:
`'2A:7A:C2:DD:...'`.
* `ext_key_usage` {Array} (Optional) The extended key usage, a set of OIDs.
* `subjectaltname` {Array} (Optional) An array of names for the subject, an
alternative to the `subject` names.
* `infoAccess` {Array} (Optional) An array describing the AuthorityInfoAccess,
used with OCSP.
* `issuerCert` {Object} (Optional) The issuer certificate object. For
self-signed certificates, this may be a circular reference.

The certificate may contain information about the public key, depending on
the key type.

For RSA keys, the following properties may be defined:
* `exponent` {string} The RSA exponent, as a string in hexadecimal number
notation. Example: `'0x010001'`.
* `modulus` {string} The RSA modulus, as a hexadecimal string. Example:
`'B56CE45CB7...'`.
* `pubkey` {Buffer} The public key.


```text
{ subject:
{ C: 'UK',
ST: 'Acknack Ltd',
L: 'Rhys Jones',
O: 'node.js',
OU: 'Test TLS Certificate',
CN: 'localhost' },
{ OU: [ 'Domain Control Validated', 'PositiveSSL Wildcard' ],
CN: '*.nodejs.org' },
issuer:
{ C: 'UK',
ST: 'Acknack Ltd',
L: 'Rhys Jones',
O: 'node.js',
OU: 'Test TLS Certificate',
CN: 'localhost' },
issuerCertificate:
{ ... another certificate, possibly with an .issuerCertificate ... },
raw: < RAW DER buffer >,
pubkey: < RAW DER buffer >,
valid_from: 'Nov 11 09:52:22 2009 GMT',
valid_to: 'Nov 6 09:52:22 2029 GMT',
fingerprint: '2A:7A:C2:DD:E5:F9:CC:53:72:35:99:7A:02:5A:71:38:52:EC:8A:DF',
fingerprint256: '2A:7A:C2:DD:E5:F9:CC:53:72:35:99:7A:02:5A:71:38:52:EC:8A:DF:00:11:22:33:44:55:66:77:88:99:AA:BB',
serialNumber: 'B9B0D332A1AA5635' }
{ C: 'GB',
ST: 'Greater Manchester',
L: 'Salford',
O: 'COMODO CA Limited',
CN: 'COMODO RSA Domain Validation Secure Server CA' },
subjectaltname: 'DNS:*.nodejs.org, DNS:nodejs.org',
infoAccess:
{ 'CA Issuers - URI':
[ 'http://crt.comodoca.com/COMODORSADomainValidationSecureServerCA.crt' ],
'OCSP - URI': [ 'http://ocsp.comodoca.com' ] },
modulus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
exponent: '0x10001',
pubkey: <Buffer ... >,
valid_from: 'Aug 14 00:00:00 2017 GMT',
valid_to: 'Nov 20 23:59:59 2019 GMT',
fingerprint: '01:02:59:D9:C3:D2:0D:08:F7:82:4E:44:A4:B4:53:C5:E2:3A:87:4D',
fingerprint256: '69:AE:1A:6A:D4:3D:C6:C1:1B:EA:C6:23:DE:BA:2A:14:62:62:93:5C:7A:EA:06:41:9B:0B:BC:87:CE:48:4E:02',
ext_key_usage: [ '1.3.6.1.5.5.7.3.1', '1.3.6.1.5.5.7.3.2' ],
serialNumber: '66593D57F20CBC573E433381B5FEC280',
raw: <Buffer ... > }
```

If the peer does not provide a certificate, an empty object will be returned.
If the socket has been destroyed, `null` will be returned.

### tlsSocket.getPeerFinished()
<!-- YAML
added: v9.9.0
Expand Down Expand Up @@ -830,8 +870,7 @@ added: v0.8.4

* `hostname` {string} The host name or IP address to verify the certificate
against.
* `cert` {Object} An object representing the peer's certificate. The returned
object has some properties corresponding to the fields of the certificate.
* `cert` {Object} A [certificate object][] representing the peer's certificate.
* Returns: {Error|undefined}

Verifies the certificate `cert` is issued to `hostname`.
Expand All @@ -847,36 +886,6 @@ the checks done with additional verification.
This function is only called if the certificate passed all other checks, such as
being issued by trusted CA (`options.ca`).

The cert object contains the parsed certificate and will have a structure
similar to:

```text
{ subject:
{ OU: [ 'Domain Control Validated', 'PositiveSSL Wildcard' ],
CN: '*.nodejs.org' },
issuer:
{ C: 'GB',
ST: 'Greater Manchester',
L: 'Salford',
O: 'COMODO CA Limited',
CN: 'COMODO RSA Domain Validation Secure Server CA' },
subjectaltname: 'DNS:*.nodejs.org, DNS:nodejs.org',
infoAccess:
{ 'CA Issuers - URI':
[ 'http://crt.comodoca.com/COMODORSADomainValidationSecureServerCA.crt' ],
'OCSP - URI': [ 'http://ocsp.comodoca.com' ] },
modulus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
exponent: '0x10001',
pubkey: <Buffer ... >,
valid_from: 'Aug 14 00:00:00 2017 GMT',
valid_to: 'Nov 20 23:59:59 2019 GMT',
fingerprint: '01:02:59:D9:C3:D2:0D:08:F7:82:4E:44:A4:B4:53:C5:E2:3A:87:4D',
fingerprint256: '69:AE:1A:6A:D4:3D:C6:C1:1B:EA:C6:23:DE:BA:2A:14:62:62:93:5C:7A:EA:06:41:9B:0B:BC:87:CE:48:4E:02',
ext_key_usage: [ '1.3.6.1.5.5.7.3.1', '1.3.6.1.5.5.7.3.2' ],
serialNumber: '66593D57F20CBC573E433381B5FEC280',
raw: <Buffer ... > }
```

## tls.connect(options[, callback])
<!-- YAML
added: v0.11.3
Expand Down Expand Up @@ -1396,5 +1405,6 @@ where `secureSocket` has the same API as `pair.cleartext`.
[TLS Session Tickets]: https://www.ietf.org/rfc/rfc5077.txt
[TLS recommendations]: https://wiki.mozilla.org/Security/Server_Side_TLS
[asn1.js]: https://www.npmjs.com/package/asn1.js
[certificate object]: #tls_certificate_object
[modifying the default cipher suite]: #tls_modifying_the_default_tls_cipher_suite
[specific attacks affecting larger AES key sizes]: https://www.schneier.com/blog/archives/2009/07/another_new_aes.html

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