Hướng dẫn php ssl certificate

[PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8]

openssl_csr_new — Generates a CSR

Description

Note: You need to have a valid openssl.cnf installed for this function to operate correctly. See the notes under the installation section for more information.

Parameters

The Distinguished Name or subject fields to be used in the certificate.

private_key should be set to a private key that was previously generated by openssl_pkey_new[] [or otherwise obtained from the other openssl_pkey family of functions]. The corresponding public portion of the key will be used to sign the CSR.

By default, the information in your system openssl.conf is used to initialize the request; you can specify a configuration file section by setting the config_section_section key of options. You can also specify an alternative openssl configuration file by setting the value of the config key to the path of the file you want to use. The following keys, if present in options behave as their equivalents in the openssl.conf, as listed in the table below.

extra_attributes is used to specify additional configuration options for the CSR. Both distinguished_names and extra_attributes are associative arrays whose keys are converted to OIDs and applied to the relevant part of the request.

Return Values

Returns the CSR or false on failure.

Changelog

Examples

Example #1 Creating a self-signed certificate

Example #2 Creating a self-signed ECC certificate [as of PHP 7.1.0]

See Also

• openssl_csr_sign[] - Sign a CSR with another certificate [or itself] and generate a certificate

Anonymous ¶

7 years ago

For those of you using Debian-based systems, the openssl configuration file is at: /etc/ssl/openssl.cnf

The_Lost_One ¶

12 years ago

Not sure whether the "bug" [undocumented behavior] I encountered is common to other people, but this comment might save hours of painful debug:
If you can't generate a new private key using openssl_pkey_new[] or openssl_csr_new[], your script hangs during the call of these functions and in case you specified a "private_key_bits" parameter, ensure that you cast the variable to an int. Took me ages to notice that.

james at kirk dot com ¶

7 years ago

When in doubt, read the source code to PHP!

$configargs is fairly opaque as to what is going on behind the scenes.  That is, until you actually look at php_openssl_parse_config[] in '/ext/openssl/openssl.c':

    SET_OPTIONAL_STRING_ARG["digest_alg", req->digest_name,
        CONF_get_string[req->req_config, req->section_name, "default_md"]];
    SET_OPTIONAL_STRING_ARG["x509_extensions", req->extensions_section,
        CONF_get_string[req->req_config, req->section_name, "x509_extensions"]];
    SET_OPTIONAL_STRING_ARG["req_extensions", req->request_extensions_section,
        CONF_get_string[req->req_config, req->section_name, "req_extensions"]];
    SET_OPTIONAL_LONG_ARG["private_key_bits", req->priv_key_bits,
        CONF_get_number[req->req_config, req->section_name, "default_bits"]];

    SET_OPTIONAL_LONG_ARG["private_key_type", req->priv_key_type, OPENSSL_KEYTYPE_DEFAULT];

Here we can see that SET_OPTIONAL_STRING_ARG[] is called for most inputs but for 'private_key_bits' SET_OPTIONAL_LONG_ARG[] is called.  Both calls are C macros that expand to code that enforces the expected input type.  The generated code ignores the input without warning/notice if an unexpected type is used and just uses the default from the configuration file.  This is why using a string with 'private_key_bits' will result in unexpected behavior.

Further inspection of the earlier initialization in the same function:

    SET_OPTIONAL_STRING_ARG["config", req->config_filename, default_ssl_conf_filename];
    SET_OPTIONAL_STRING_ARG["config_section_name", req->section_name, "req"];
    req->global_config = CONF_load[NULL, default_ssl_conf_filename, NULL];
    req->req_config = CONF_load[NULL, req->config_filename, NULL];

    if [req->req_config == NULL] {
        return FAILURE;
    }

And elsewhere in another function:

    /* default to 'openssl.cnf' if no environment variable is set */
    if [config_filename == NULL] {
        snprintf[default_ssl_conf_filename, sizeof[default_ssl_conf_filename], "%s/%s",
                X509_get_default_cert_area[],
                "openssl.cnf"];
    } else {
        strlcpy[default_ssl_conf_filename, config_filename, sizeof[default_ssl_conf_filename]];
    }

Reveals that 'config' in $configargs is an override for any default setting elsewhere.  This actually negates the comment in the documentation that says "Note: You need to have a valid openssl.cnf installed for this function to operate correctly. See the notes under the installation section for more information."  A more correct sentence would be "Note:  You need to either have a valid openssl.cnf set up or use $configargs to point at a valid openssl.cnf file for this function to operate correctly."

All of that goes to show that looking at the PHP source code is the only real way to figure out what is actually happening.  Doing so saves time and effort.

main ATT jokester DOTT fr ¶

14 years ago

To set the "basicConstraints" to  "critical,CA:TRUE", you have to define configargs, but in the openssl_csr_sign[] function !

That's my example of code to sign a "child" certificate :

$CAcrt = "file://ca.crt";
$CAkey = array["file://ca.key", "myPassWord"];

$clientKeys = openssl_pkey_new[];
$dn = array[
    "countryName" => "FR",
    "stateOrProvinceName" => "Finistere",
    "localityName" => "Plouzane",
    "organizationName" => "Ecole Nationale d'Ingenieurs de Brest",
    "organizationalUnitName" => "Enib Students",
    "commonName" => "www.enib.fr",
    "emailAddress" => ""
];
$csr = openssl_csr_new[$dn, $clientPrivKey];

$configArgs = array["x509_extensions" => "v3_req"];
$cert = openssl_csr_sign[$csr, $CAcrt, $CAkey, 100, $configArgs];

openssl_x509_export_to_file[$cert, "childCert.crt"];

Then if you want to add some more options, you can edit the "/etc/ssl/openssl.cnf" ssl config' file [debian path], and add these after the [ v3_req ] tag.

alex at nodex dot co dot uk ¶

7 years ago

In the PHP example above it uses "UK" as the country name which is incorrect, the country name must be "GB"

Richard Lynch ¶

9 years ago

There appears to be no openssl_csr_free function.

At least not here.

If it's in the source, one might be able to just call it.

If it's not in the source, it probably should be.

Anonymous ¶

17 years ago

If you get the error:

error:0D11A086:asn1 encoding routines:ASN1_mbstring_copy:string too short

then look at your key:value pairs in the $dn [distinguished name] array.

If you have one value [like "organizationalUnitName" = ""] set to an empty string, it will throw the above error.

Fix the error by either eliminating that array element from $dn completely, or using a space " " instead of an empty string.

robertliu AT wiscore DOT com ¶

17 years ago

I am using PHP-4.3.11.
The type of configargs--private_key_bits is a INTEGER, not a string.
An example of configration:


dankybastard at hotmail ¶

17 years ago

As you probably guessed from the example, the documentation is misinforming.  openssl_csr_new returns a CSR resource or FALSE on failure.

mixed openssl_csr_new [assoc_array dn, resource_privkey, [...]]

@operator ¶

5 years ago

One command to create modern certificate request with 4 SAN subdomain.
According to RFC you can change CN [common name] and subjectAltName. When cert validated searching in CN and subjectAltName.

openssl req -new -nodes -config