GTlsCertificate: GIO Reference Manual

## GTlsCertificate GTlsCertificate — TLS certificate |

## Functions

GTlsCertificate * | g_tls_certificate_new_from_pem ()
GTlsCertificate * | g_tls_certificate_new_from_pkcs12 ()
GTlsCertificate * | g_tls_certificate_new_from_file ()
GTlsCertificate * | g_tls_certificate_new_from_file_with_password ()
GTlsCertificate * | g_tls_certificate_new_from_files ()
GTlsCertificate * | g_tls_certificate_new_from_pkcs11_uris ()
GList * | g_tls_certificate_list_new_from_file ()
GPtrArray * | g_tls_certificate_get_dns_names ()
GPtrArray * | g_tls_certificate_get_ip_addresses ()
GTlsCertificate * | g_tls_certificate_get_issuer ()
gchar * | g_tls_certificate_get_issuer_name ()
GDateTime * | g_tls_certificate_get_not_valid_before ()
GDateTime * | g_tls_certificate_get_not_valid_after ()
gchar * | g_tls_certificate_get_subject_name ()
GTlsCertificateFlags | g_tls_certificate_verify ()
gboolean | g_tls_certificate_is_same ()

## Properties

GByteArray * | certificate | Read / Write / Construct Only
char * | certificate-pem | Read / Write / Construct Only
GPtrArray * | dns-names | Read
GPtrArray * | ip-addresses | Read
GTlsCertificate * | issuer | Read / Write / Construct Only
char * | issuer-name | Read
GDateTime * | not-valid-after | Read
GDateTime * | not-valid-before | Read
char * | password | Write / Construct Only
char * | pkcs11-uri | Read / Write / Construct Only
GByteArray * | pkcs12-data | Write / Construct Only
GByteArray * | private-key | Read / Write / Construct Only
char * | private-key-pem | Read / Write / Construct Only
char * | private-key-pkcs11-uri | Read / Write / Construct Only
char * | subject-name | Read

## Types and Values

| GTlsCertificate

## Object Hierarchy

        GObject
        ╰── GTlsCertificate

## Includes

    #include <gio/gio.h>

## Description

A certificate used for TLS authentication and encryption. This can represent either a certificate only (eg, the certificate received by a client from a server), or the combination of a certificate and a private key (which is needed when acting as a GTlsServerConnection).

## Functions

### g_tls_certificate_new_from_pem ()

    GTlsCertificate *
    g_tls_certificate_new_from_pem (const gchar *data,
                                    gssize length,
                                    GError **error);

Creates a GTlsCertificate from the PEM-encoded data in `data` . If `data` includes both a certificate and a private key, then the returned certificate will include the private key data as well. (See the “private-key-pem” property for information about supported formats.)

The returned certificate will be the first certificate found in `data` . As of GLib 2.44, if `data` contains more certificates it will try to load a certificate chain. All certificates will be verified in the order found (top-level certificate should be the last one in the file) and the “issuer” property of each certificate will be set accordingly if the verification succeeds. If any certificate in the chain cannot be verified, the first certificate in the file will still be returned.

#### Parameters

data | PEM-encoded certificate data |
length | the length of `data` , or -1 if it's 0-terminated. |
error | GError for error reporting, or `NULL` to ignore. |

#### Returns

the new certificate, or `NULL` if `data` is invalid

Since: 2.28

### g_tls_certificate_new_from_pkcs12 ()

    GTlsCertificate *
    g_tls_certificate_new_from_pkcs12 (const guint8 *data,
                                       gsize length,
                                       const gchar *password,
                                       GError **error);

Creates a GTlsCertificate from the data in `data` . It must contain a certificate and matching private key.

If extra certificates are included they will be verified as a chain and the “issuer” property will be set. All other data will be ignored.

You can pass as single password for all of the data which will be used both for the PKCS 12 container as well as encrypted private keys. If decryption fails it will error with `G_TLS_ERROR_BAD_CERTIFICATE_PASSWORD`.

This constructor requires support in the current GTlsBackend. If support is missing it will error with `G_IO_ERROR_NOT_SUPPORTED`.

Other parsing failures will error with `G_TLS_ERROR_BAD_CERTIFICATE`.

#### Parameters

data | DER-encoded PKCS 12 format certificate data. | [array length=length]
length | the length of `data` |
password | optional password for encrypted certificate data. | [nullable]
error | GError for error reporting, or `NULL` to ignore. |

#### Returns

the new certificate, or `NULL` if `data` is invalid

Since: 2.72

### g_tls_certificate_new_from_file ()

    GTlsCertificate *
    g_tls_certificate_new_from_file (const gchar *file,
                                     GError **error);

Creates a GTlsCertificate from the data in `file` .

As of 2.72, if the filename ends in `.p12` or `.pfx` the data is loaded by `g_tls_certificate_new_from_pkcs12()` otherwise it is loaded by `g_tls_certificate_new_from_pem()`. See those functions for exact details.

If `file` cannot be read or parsed, the function will return `NULL` and set `error` .

#### Parameters

file | file containing a certificate to import. | [type filename]
error | GError for error reporting, or `NULL` to ignore |

#### Returns

the new certificate, or `NULL` on error

Since: 2.28

### g_tls_certificate_new_from_file_with_password ()

    GTlsCertificate *
    g_tls_certificate_new_from_file_with_password
                                   (const gchar *file,
                                    const gchar *password,
                                    GError **error);

Creates a GTlsCertificate from the data in `file` .

If `file` cannot be read or parsed, the function will return `NULL` and set `error` .

Any unknown file types will error with `G_IO_ERROR_NOT_SUPPORTED`. Currently only `.p12` and `.pfx` files are supported. See `g_tls_certificate_new_from_pkcs12()` for more details.

#### Parameters

file | file containing a certificate to import. | [type filename]
password | password for PKCS 12 files. | [not nullable]
error | GError for error reporting, or `NULL` to ignore |

#### Returns

the new certificate, or `NULL` on error

Since: 2.72

### g_tls_certificate_new_from_files ()

    GTlsCertificate *
    g_tls_certificate_new_from_files (const gchar *cert_file,
                                      const gchar *key_file,
                                      GError **error);

Creates a GTlsCertificate from the PEM-encoded data in `cert_file` and `key_file` . The returned certificate will be the first certificate found in `cert_file` . As of GLib 2.44, if `cert_file` contains more certificates it will try to load a certificate chain. All certificates will be verified in the order found (top-level certificate should be the last one in the file) and the “issuer” property of each certificate will be set accordingly if the verification succeeds. If any certificate in the chain cannot be verified, the first certificate in the file will still be returned.

If either file cannot be read or parsed, the function will return `NULL` and set `error` . Otherwise, this behaves like `g_tls_certificate_new_from_pem()`.

#### Parameters

cert_file | file containing one or more PEM-encoded certificates to import. | [type filename]
key_file | file containing a PEM-encoded private key to import. | [type filename]
error | GError for error reporting, or `NULL` to ignore. |

#### Returns

the new certificate, or `NULL` on error

Since: 2.28

### g_tls_certificate_new_from_pkcs11_uris ()

    GTlsCertificate *
    g_tls_certificate_new_from_pkcs11_uris
                                   (const gchar *pkcs11_uri,
                                    const gchar *private_key_pkcs11_uri,
                                    GError **error);

Creates a GTlsCertificate from a PKCS #11 URI.

An example `pkcs11_uri` would be `pkcs11:model=Model;manufacturer=Manufacture;serial=1;token=My%20Client%20Certificate;id=%01`

Where the token’s layout is:

    1
    2
    3
    4
    5
    6
    7
    8
    9
    Object 0:
      URL: pkcs11:model=Model;manufacturer=Manufacture;serial=1;token=My%20Client%20Certificate;id=%01;object=private%20key;type=private
      Type: Private key (RSA-2048)
      ID: 01

    Object 1:
      URL: pkcs11:model=Model;manufacturer=Manufacture;serial=1;token=My%20Client%20Certificate;id=%01;object=Certificate%20for%20Authentication;type=cert
      Type: X.509 Certificate (RSA-2048)
      ID: 01

In this case the certificate and private key would both be detected and used as expected. `pkcs_uri` may also just reference an X.509 certificate object and then optionally `private_key_pkcs11_uri` allows using a private key exposed under a different URI.

Note that the private key is not accessed until usage and may fail or require a PIN later.

#### Parameters

pkcs11_uri | A PKCS #11 URI |
private_key_pkcs11_uri | A PKCS #11 URI. | [nullable]
error | GError for error reporting, or `NULL` to ignore. |

#### Returns

the new certificate, or `NULL` on error.

[transfer full]

Since: 2.68

### g_tls_certificate_list_new_from_file ()

    GList *
    g_tls_certificate_list_new_from_file (const gchar *file,
                                          GError **error);

Creates one or more GTlsCertificates from the PEM-encoded data in `file` . If `file` cannot be read or parsed, the function will return `NULL` and set `error` . If `file` does not contain any PEM-encoded certificates, this will return an empty list and not set `error` .

#### Parameters

file | file containing PEM-encoded certificates to import. | [type filename]
error | GError for error reporting, or `NULL` to ignore. |

#### Returns

a GList containing GTlsCertificate objects. You must free the list and its contents when you are done with it.

[element-type Gio.TlsCertificate][transfer full]

Since: 2.28

### g_tls_certificate_get_dns_names ()

    GPtrArray *
    g_tls_certificate_get_dns_names (GTlsCertificate *cert);

Gets the value of “dns-names”.

#### Parameters

cert | a GTlsCertificate |

#### Returns

A GPtrArray of GBytes elements, or `NULL` if it's not available.

[nullable][element-type GBytes][transfer container]

Since: 2.70

### g_tls_certificate_get_ip_addresses ()

    GPtrArray *
    g_tls_certificate_get_ip_addresses (GTlsCertificate *cert);

Gets the value of “ip-addresses”.

#### Parameters

cert | a GTlsCertificate |

#### Returns

A GPtrArray of GInetAddress elements, or `NULL` if it's not available.

[nullable][element-type GInetAddress][transfer container]

Since: 2.70

### g_tls_certificate_get_issuer ()

    GTlsCertificate *
    g_tls_certificate_get_issuer (GTlsCertificate *cert);

Gets the GTlsCertificate representing `cert` 's issuer, if known

#### Parameters

cert | a GTlsCertificate |

#### Returns

The certificate of `cert` 's issuer, or `NULL` if `cert` is self-signed or signed with an unknown certificate.

[nullable][transfer none]

Since: 2.28

### g_tls_certificate_get_issuer_name ()

    gchar *
    g_tls_certificate_get_issuer_name (GTlsCertificate *cert);

Returns the issuer name from the certificate.

#### Parameters

cert | a GTlsCertificate |

#### Returns

The issuer name, or `NULL` if it's not available.

[nullable][transfer full]

Since: 2.70

### g_tls_certificate_get_not_valid_before ()

    GDateTime *
    g_tls_certificate_get_not_valid_before
                                   (GTlsCertificate *cert);

Returns the time at which the certificate became or will become valid.

#### Parameters

cert | a GTlsCertificate |

#### Returns

The not-valid-before date, or `NULL` if it's not available.

[nullable][transfer full]

Since: 2.70

### g_tls_certificate_get_not_valid_after ()

    GDateTime *
    g_tls_certificate_get_not_valid_after (GTlsCertificate *cert);

Returns the time at which the certificate became or will become invalid.

#### Parameters

cert | a GTlsCertificate |

#### Returns

The not-valid-after date, or `NULL` if it's not available.

[nullable][transfer full]

Since: 2.70

### g_tls_certificate_get_subject_name ()

    gchar *
    g_tls_certificate_get_subject_name (GTlsCertificate *cert);

Returns the subject name from the certificate.

#### Parameters

cert | a GTlsCertificate |

#### Returns

The subject name, or `NULL` if it's not available.

[nullable][transfer full]

Since: 2.70

### g_tls_certificate_verify ()

    GTlsCertificateFlags
    g_tls_certificate_verify (GTlsCertificate *cert,
                              GSocketConnectable *identity,
                              GTlsCertificate *trusted_ca);

This verifies `cert` and returns a set of GTlsCertificateFlags indicating any problems found with it. This can be used to verify a certificate outside the context of making a connection, or to check a certificate against a CA that is not part of the system CA database.

If `cert` is valid, `G_TLS_CERTIFICATE_NO_FLAGS` is returned.

If `identity` is not `NULL`, `cert` 's name(s) will be compared against it, and `G_TLS_CERTIFICATE_BAD_IDENTITY` will be set in the return value if it does not match. If `identity` is `NULL`, that bit will never be set in the return value.

If `trusted_ca` is not `NULL`, then `cert` (or one of the certificates in its chain) must be signed by it, or else `G_TLS_CERTIFICATE_UNKNOWN_CA` will be set in the return value. If `trusted_ca` is `NULL`, that bit will never be set in the return value.

GLib guarantees that if certificate verification fails, at least one error will be set in the return value, but it does not guarantee that all possible errors will be set. Accordingly, you may not safely decide to ignore any particular type of error. For example, it would be incorrect to mask `G_TLS_CERTIFICATE_EXPIRED` if you want to allow expired certificates, because this could potentially be the only error flag set even if other problems exist with the certificate.

Because TLS session context is not used, GTlsCertificate may not perform as many checks on the certificates as GTlsConnection would. For example, certificate constraints may not be honored, and revocation checks may not be performed. The best way to verify TLS certificates used by a TLS connection is to let GTlsConnection handle the verification.

#### Parameters

cert | a GTlsCertificate |
identity | the expected peer identity. | [nullable]
trusted_ca | the certificate of a trusted authority. | [nullable]

#### Returns

the appropriate GTlsCertificateFlags

Since: 2.28

### g_tls_certificate_is_same ()

    gboolean
    g_tls_certificate_is_same (GTlsCertificate *cert_one,
                               GTlsCertificate *cert_two);

Check if two GTlsCertificate objects represent the same certificate. The raw DER byte data of the two certificates are checked for equality. This has the effect that two certificates may compare equal even if their “issuer”, “private-key”, or “private-key-pem” properties differ.

#### Parameters

cert_one | first certificate to compare |
cert_two | second certificate to compare |

#### Returns

whether the same or not

Since: 2.34

## Types and Values

### GTlsCertificate

    typedef struct _GTlsCertificate GTlsCertificate;

Abstract base class for TLS certificate types.

Since: 2.28

## Property Details

### The `“certificate”` property

      “certificate”              GByteArray *

The DER (binary) encoded representation of the certificate. This property and the “certificate-pem” property represent the same data, just in different forms.

Owner: GTlsCertificate

Flags: Read / Write / Construct Only

Since: 2.28

### The `“certificate-pem”` property

      “certificate-pem”          char *

The PEM (ASCII) encoded representation of the certificate. This property and the “certificate” property represent the same data, just in different forms.

Owner: GTlsCertificate

Flags: Read / Write / Construct Only

Default value: NULL

Since: 2.28

### The `“dns-names”` property

      “dns-names”                GPtrArray *

The DNS names from the certificate's Subject Alternative Names (SANs), `NULL` if unavailable.

[transfer container]

Owner: GTlsCertificate

Flags: Read

Since: 2.70

### The `“ip-addresses”` property

      “ip-addresses”             GPtrArray *

The IP addresses from the certificate's Subject Alternative Names (SANs), `NULL` if unavailable.

[transfer container]

Owner: GTlsCertificate

Flags: Read

Since: 2.70

### The `“issuer”` property

      “issuer”                   GTlsCertificate *

A GTlsCertificate representing the entity that issued this certificate. If `NULL`, this means that the certificate is either self-signed, or else the certificate of the issuer is not available.

Beware the issuer certificate may not be the same as the certificate that would actually be used to construct a valid certification path during certificate verification. RFC 4158 explains why an issuer certificate cannot be naively assumed to be part of the the certification path (though GLib's TLS backends may not follow the path building strategies outlined in this RFC). Due to the complexity of certification path building, GLib does not provide any way to know which certification path will actually be used. Accordingly, this property cannot be used to make security-related decisions. Only GLib itself should make security decisions about TLS certificates.

Owner: GTlsCertificate

Flags: Read / Write / Construct Only

Since: 2.28

### The `“issuer-name”` property

      “issuer-name”              char *

The issuer from the certificate, `NULL` if unavailable.

[nullable]

Owner: GTlsCertificate

Flags: Read

Default value: NULL

Since: 2.70

### The `“not-valid-after”` property

      “not-valid-after”          GDateTime *

The time at which this cert is no longer valid, `NULL` if unavailable.

[nullable]

Owner: GTlsCertificate

Flags: Read

Since: 2.70

### The `“not-valid-before”` property

      “not-valid-before”         GDateTime *

The time at which this cert is considered to be valid, `NULL` if unavailable.

[nullable]

Owner: GTlsCertificate

Flags: Read

Since: 2.70

### The `“password”` property

      “password”                 char *

An optional password used when constructed with GTlsCertificate:pkcs12-data.

[nullable]

Owner: GTlsCertificate

Flags: Write / Construct Only

Default value: NULL

Since: 2.72

### The `“pkcs11-uri”` property

      “pkcs11-uri”               char *

A URI referencing the PKCS #11 objects containing an X.509 certificate and optionally a private key.

If `NULL`, the certificate is either not backed by PKCS #11 or the GTlsBackend does not support PKCS #11.

[nullable]

Owner: GTlsCertificate

Flags: Read / Write / Construct Only

Default value: NULL

Since: 2.68

### The `“pkcs12-data”` property

      “pkcs12-data”              GByteArray *

The PKCS 12 formatted data used to construct the object.

See also: `g_tls_certificate_new_from_pkcs12()`

[nullable]

Owner: GTlsCertificate

Flags: Write / Construct Only

Since: 2.72

### The `“private-key”` property

      “private-key”              GByteArray *

The DER (binary) encoded representation of the certificate's private key, in either PKCS #1 format or unencrypted PKCS #8 format. PKCS #8 format is supported since 2.32; earlier releases only support PKCS #1. You can use the `openssl rsa` tool to convert PKCS #8 keys to PKCS #1.

This property (or the “private-key-pem” property) can be set when constructing a key (for example, from a file). Since GLib 2.70, it is now also readable; however, be aware that if the private key is backed by a PKCS #11 URI – for example, if it is stored on a smartcard – then this property will be `NULL`. If so, the private key must be referenced via its PKCS #11 URI, “private-key-pkcs11-uri”. You must check both properties to see if the certificate really has a private key. When this property is read, the output format will be unencrypted PKCS #8.

[nullable]

Owner: GTlsCertificate

Flags: Read / Write / Construct Only

Since: 2.28

### The `“private-key-pem”` property

      “private-key-pem”          char *

The PEM (ASCII) encoded representation of the certificate's private key in either PKCS #1 format ("`BEGIN RSA PRIVATE KEY`") or unencrypted PKCS #8 format ("`BEGIN PRIVATE KEY`"). PKCS #8 format is supported since 2.32; earlier releases only support PKCS #1. You can use the `openssl rsa` tool to convert PKCS #8 keys to PKCS #1.

This property (or the “private-key” property) can be set when constructing a key (for example, from a file). Since GLib 2.70, it is now also readable; however, be aware that if the private key is backed by a PKCS #11 URI - for example, if it is stored on a smartcard - then this property will be `NULL`. If so, the private key must be referenced via its PKCS #11 URI, “private-key-pkcs11-uri”. You must check both properties to see if the certificate really has a private key. When this property is read, the output format will be unencrypted PKCS #8.

[nullable]

Owner: GTlsCertificate

Flags: Read / Write / Construct Only

Default value: NULL

Since: 2.28

### The `“private-key-pkcs11-uri”` property

      “private-key-pkcs11-uri”   char *

A URI referencing a PKCS #11 object containing a private key.

[nullable]

Owner: GTlsCertificate

Flags: Read / Write / Construct Only

Default value: NULL

Since: 2.68

### The `“subject-name”` property

      “subject-name”             char *

The subject from the cert, `NULL` if unavailable.

[nullable]

Owner: GTlsCertificate

Flags: Read

Default value: NULL

Since: 2.70

## See Also

GTlsConnection