SSL context options

SSL context optionsSSL context option listing

Description

Context options for ssl:// and tls:// transports.

Options

verify_peer boolean

Require verification of SSL certificate used.

Defaults to FALSE.

allow_self_signed boolean

Allow self-signed certificates. Requires verify_peer.

Defaults to FALSE

cafile string

Location of Certificate Authority file on local filesystem which should be used with the verify_peer context option to authenticate the identity of the remote peer.

capath string

If cafile is not specified or if the certificate is not found there, the directory pointed to by capath is searched for a suitable certificate. capath must be a correctly hashed certificate directory.

local_cert string

Path to local certificate file on filesystem. It must be a PEM encoded file which contains your certificate and private key. It can optionally contain the certificate chain of issuers.

passphrase string

Passphrase with which your local_cert file was encoded.

CN_match string

Common Name we are expecting. PHP will perform limited wildcard matching. If the Common Name does not match this, the connection attempt will fail.

verify_depth integer

Abort if the certificate chain is too deep.

Defaults to no verification.

ciphers string

Sets the list of available ciphers. The format of the string is described in » ciphers(1).

Defaults to DEFAULT.

capture_peer_cert boolean

If set to TRUE a peer_certificate context option will be created containing the peer certificate.

capture_peer_cert_chain boolean

If set to TRUE a peer_certificate_chain context option will be created containing the certificate chain.

SNI_enabled boolean

If set to TRUE server name indication will be enabled. Enabling SNI allows multiple certificates on the same IP address.

SNI_server_name string

If set, then this value will be used as server name for server name indication. If this value is not set, then the server name is guessed based on the hostname used when opening the stream.

disable_compression boolean

If set, disable TLS compression. This can help mitigate the CRIME attack vector.

Changelog

Version Description
5.4.13 Added disable_compression. Requires OpenSSL >= 1.0.0.
5.3.2 Added SNI_enabled and SNI_server_name.
5.0.0 Added capture_peer_cert, capture_peer_chain and ciphers.

Notes

Note: Because ssl:// is the underlying transport for the https:// and ftps:// wrappers, any context options which apply to ssl:// also apply to https:// and ftps://.

Note: For SNI (Server Name Indication) to be available, then PHP must be compiled with OpenSSL 0.9.8j or greater. Use the OPENSSL_TLSEXT_SERVER_NAME to determine whether SNI is supported.

Коментарии

Автор:
CN_match works contrary to intuitive thinking. I came across this when I was developing SSL server implemented in PHP. I stated (in code): 

- do not allow self signed certs (works)
- verify peer certs against CA cert (works)
- verify the client's CN against CN_match (does not work), like this:

stream_context_set_option($context, 'ssl', 'CN_match', '*.example.org');

I presumed this would match any client with CN below .example.org domain.
Unfortunately this is NOT the case. The option above does not do that.

What it really does is this:
- it takes client's CN and compares it to CN_match
- IF CLIENT's CN CONTAINS AN ASTERISK like *.example.org, then it is matched against CN_match in wildcard matching fashion

Examples to illustrate behaviour:
(CNM = server's CN_match)
(CCN = client's CN)

- CNM=host.example.org, CCN=host.example.org ---> OK
- CNM=host.example.org, CCN=*.example.org ---> OK
- CNM=.example.org, CCN=*.example.org ---> OK
- CNM=example.org, CCN=*.example.org ---> ERROR

- CNM=*.example.org, CCN=host.example.org ---> ERROR
- CNM=*.example.org, CCN=*.example.org ---> OK

According to PHP sources I believe that the same applies if you are trying to act as Client and the server contains a wildcard certificate. If you set CN_match to myserver.example.org and server presents itself with *.example.org, the connection is allowed.

Everything above applies to PHP version 5.2.12.
I will supply a patch to support CN_match starting with asterisk.
2010-02-20 13:11:10
http://php5.kiev.ua/manual/ru/context.ssl.html
I used this for Apple Push Notification Service.
Passed in a local certificate filename `cert.pem` trough local_cert option. 
Worked fine, when invoked the script directly.

But when I included/required the script from a different location, it stopped working, without any explicit error message.

Resolved by passed in the full path for the file `<FullPathTo>cert.pem`.
2014-01-31 14:06:08
http://php5.kiev.ua/manual/ru/context.ssl.html
There is also a crypto_type context. In older versions this was crypto_method. This is referenced on function.stream-socket-enable-crypto
2016-09-05 16:48:40
http://php5.kiev.ua/manual/ru/context.ssl.html
Автор:
It appears that "allow_self_signed" does not and cannot apply to the local_cert option.

The stunnel verify=4 option, which verifies but ignores a CA, has no analog in these settings, which is unfortunate.

Even more perplexingly, while the "openssl verify -CAfile" is successful, PHP appears unable to use the new ca/crt pair in any configuration.

I did actually link my PHP against a copy of LibreSSL 2.3.8, but PHP oddly is unable to use TLS1.1 or 1.2. It does, however, enable EC secp521r1 (of which my native OpenSSL 0.9.8e is incapable).
2016-12-02 21:28:14
http://php5.kiev.ua/manual/ru/context.ssl.html
Автор:
I am unable to load a PEM that was generated with the stunnel tools. However, I am able to use PHP calls to generate a working PEM that is recognized both by stunnel and php, as outlined here:

http://www.devdungeon.com/content/how-use-ssl-sockets-php

This code fragment is now working for me, and with stunnel verify=4, both sides confirm the fingerprint. Oddly, if "tls://" is set below, then TLSv1 is forced, but using "ssl://" allows TLSv1.2:

$stream_context = stream_context_create([ 'ssl' => [
'local_cert'        => '/path/to/key.pem',
'peer_fingerprint'  => openssl_x509_fingerprint(file_get_contents('/path/to/key.crt')),
'verify_peer'       => false,
'verify_peer_name'  => false,
'allow_self_signed' => true,
'verify_depth'      => 0 ]]);

$fp = stream_socket_client('ssl://ssl.server.com:12345',
   $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $stream_context);
fwrite($fp, "foo bar\n");
while($line = fgets($fp, 8192)) echo $line;
2016-12-05 21:53:46
http://php5.kiev.ua/manual/ru/context.ssl.html
If you want to validate the server against a local certificate, which you already saved, to further validate the target server, you have to use a fullchain.pem. Then the verify_peer option will work. So just get the server certificate, and search the root CA's pem's and copy everything into a single file. For example:

My certificate has the "GeoTrust TLS RSA CA G1" certificate in the chain, so you google that string. Go to the official digicert Geotrust page and download the "GeoTrustTLSRSACAG1.crt" certificate. Then you can use the following command to convert it into the pem format:
openssl x509 -inform DER -in GeoTrustTLSRSACAG1.crt -out GeoTrustTLSRSACAG1.crt.pem -outform PEM
2018-11-09 15:09:05
http://php5.kiev.ua/manual/ru/context.ssl.html
i usually download root CA certificate from https://curl.haxx.se/docs/caextract.html then put it as 'cafile' and it work almost all of the time.

the only problem i'v ever found is when the server does not properly sending intermediete CA certificate, then, you must add it manually to the file.
2020-01-13 11:21:38
http://php5.kiev.ua/manual/ru/context.ssl.html
recommended use "ssl://" transport.

in php 5.5 ~ 7.1
ssl:// transport = ssl_v2|ssl_v3|tls_v1.0|tls_v1.1|tls_v1.2
tls:// transport = tls_v1.0

after 7.2 ssl:// and tls:// transports is same
php 7.2 ~ 7.3 = tls_v1.0|tls_v1.1|tls_v1.2
php 7.4 ~ 8.1 = tls_v1.0|tls_v1.1|tls_v1.2|tls_v1.3
2022-04-19 06:41:48
http://php5.kiev.ua/manual/ru/context.ssl.html
Enable SNI (Server Name Indication):
PEM must be contains certificate and private key.
<?php
$context 
stream_context_create([
   
'ssl' => [
       
'SNI_enabled' => true,
       
'SNI_server_certs' => [
           
'host1.com' => '/path/host1.com.pem',
           
'host2.com' => '/path/host2.com.pem',
        ],
    ]
]);
?>
2022-12-09 18:52:49
http://php5.kiev.ua/manual/ru/context.ssl.html

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