GPG signature verification results: OSTree API references

GPG signature verification results

GPG signature verification results — Inspect detached GPG signatures

Functions

guint	ostree_gpg_verify_result_count_all ()
guint	ostree_gpg_verify_result_count_valid ()
gboolean	ostree_gpg_verify_result_lookup ()
GVariant *	ostree_gpg_verify_result_get ()
GVariant *	ostree_gpg_verify_result_get_all ()
void	ostree_gpg_verify_result_describe ()
void	ostree_gpg_verify_result_describe_variant ()
gboolean	ostree_gpg_verify_result_require_valid_signature ()

Types and Values

enum	OstreeGpgError
typedef	OstreeGpgVerifyResult
enum	OstreeGpgSignatureAttr
enum	OstreeGpgSignatureFormatFlags

Description

OstreeGpgVerifyResult contains verification details for GPG signatures read from a detached OstreeRepo metadata object.

Use ostree_gpg_verify_result_count_all() and ostree_gpg_verify_result_count_valid() to quickly check overall signature validity.

Use ostree_gpg_verify_result_lookup() to find a signature by the key ID or fingerprint of the signing key.

For more in-depth inspection, such as presenting signature details to the user, pass an array of attribute values to ostree_gpg_verify_result_get() or get all signature details with ostree_gpg_verify_result_get_all().

Functions

ostree_gpg_verify_result_count_all ()

guint
ostree_gpg_verify_result_count_all (OstreeGpgVerifyResult *result);

Counts all the signatures in result .

Parameters

result

an OstreeGpgVerifyResult

Returns

signature count

ostree_gpg_verify_result_count_valid ()

guint
ostree_gpg_verify_result_count_valid (OstreeGpgVerifyResult *result);

Counts only the valid signatures in result .

Parameters

result

an OstreeGpgVerifyResult

Returns

valid signature count

ostree_gpg_verify_result_lookup ()

gboolean
ostree_gpg_verify_result_lookup (OstreeGpgVerifyResult *result,
                                 const gchar *key_id,
                                 guint *out_signature_index);

Searches result for a signature signed by key_id . If a match is found, the function returns TRUE and sets out_signature_index so that further signature details can be obtained through ostree_gpg_verify_result_get(). If no match is found, the function returns FALSE and leaves out_signature_index unchanged.

Parameters

result	an OstreeGpgVerifyResult
key_id	a GPG key ID or fingerprint
out_signature_index	return location for the index of the signature signed by `key_id` , or `NULL`.	[out]

Returns

TRUE on success, FALSE on failure

ostree_gpg_verify_result_get ()

GVariant *
ostree_gpg_verify_result_get (OstreeGpgVerifyResult *result,
                              guint signature_index,
                              OstreeGpgSignatureAttr *attrs,
                              guint n_attrs);

Builds a GVariant tuple of requested attributes for the GPG signature at signature_index in result . See the OstreeGpgSignatureAttr description for the GVariantType of each available attribute.

It is a programmer error to request an invalid OstreeGpgSignatureAttr or an invalid signature_index . Use ostree_gpg_verify_result_count_all() to find the number of signatures in result .

Parameters

result	an OstreeGpgVerifyResult
signature_index	which signature to get attributes from
attrs	Array of requested attributes.	[array length=n_attrs]
n_attrs	Length of the `attrs` array

Returns

a new, floating, GVariant tuple

ostree_gpg_verify_result_get_all ()

GVariant *
ostree_gpg_verify_result_get_all (OstreeGpgVerifyResult *result,
                                  guint signature_index);

Builds a GVariant tuple of all available attributes for the GPG signature at signature_index in result .

The child values in the returned GVariant tuple are ordered to match the OstreeGpgSignatureAttr enumeration, which means the enum values can be used as index values in functions like g_variant_get_child(). See the OstreeGpgSignatureAttr description for the GVariantType of each available attribute.

The OstreeGpgSignatureAttr enumeration may be extended in the future with new attributes, which would affect the GVariant tuple returned by this function. While the position and type of current child values in the GVariant tuple will not change, to avoid backward-compatibility issues please do not depend on the tuple's overall size or type signature.

It is a programmer error to request an invalid signature_index . Use ostree_gpg_verify_result_count_all() to find the number of signatures in result .

Parameters

result	an OstreeGpgVerifyResult
signature_index	which signature to get attributes from

Returns

a new, floating, GVariant tuple

ostree_gpg_verify_result_describe ()

void
ostree_gpg_verify_result_describe (OstreeGpgVerifyResult *result,
                                   guint signature_index,
                                   GString *output_buffer,
                                   const gchar *line_prefix,
                                   OstreeGpgSignatureFormatFlags flags);

Appends a brief, human-readable description of the GPG signature at signature_index in result to the output_buffer . The description spans multiple lines. A line_prefix string, if given, will precede each line of the description.

The flags argument is reserved for future variations to the description format. Currently must be 0.

It is a programmer error to request an invalid signature_index . Use ostree_gpg_verify_result_count_all() to find the number of signatures in result .

Parameters

result	an OstreeGpgVerifyResult
signature_index	which signature to describe
output_buffer	a GString to hold the description
line_prefix	optional line prefix string.	[allow-none]
flags	flags to adjust the description format

ostree_gpg_verify_result_describe_variant ()

void
ostree_gpg_verify_result_describe_variant
                               (GVariant *variant,
                                GString *output_buffer,
                                const gchar *line_prefix,
                                OstreeGpgSignatureFormatFlags flags);

Similar to ostree_gpg_verify_result_describe() but takes a GVariant of all attributes for a GPG signature instead of an OstreeGpgVerifyResult and signature index.

The variant MUST have been created by ostree_gpg_verify_result_get_all().

Parameters

variant	a GVariant from `ostree_gpg_verify_result_get_all()`
output_buffer	a GString to hold the description
line_prefix	optional line prefix string.	[allow-none]
flags	flags to adjust the description format

ostree_gpg_verify_result_require_valid_signature ()

gboolean
ostree_gpg_verify_result_require_valid_signature
                               (OstreeGpgVerifyResult *result,
                                GError **error);

Checks if the result contains at least one signature from the trusted keyring. You can call this function immediately after ostree_repo_verify_summary() or ostree_repo_verify_commit_ext() - it will handle the NULL result and filled error too.

Parameters

result	an OstreeGpgVerifyResult.	[nullable]
error	A GError

Returns

TRUE if result was not NULL and had at least one signature from trusted keyring, otherwise FALSE

Since: 2016.6

Types and Values

enum OstreeGpgError

Errors returned by signature creation and verification operations in OSTree. These may be returned by any API which creates or verifies signatures.

Members

OSTREE_GPG_ERROR_NO_SIGNATURE	A signature was expected, but not found.
OSTREE_GPG_ERROR_INVALID_SIGNATURE	A signature was malformed.
OSTREE_GPG_ERROR_MISSING_KEY	A signature was found, but was created with a key not in the configured keyrings.
OSTREE_GPG_ERROR_EXPIRED_SIGNATURE	A signature was expired. Since: 2020.1.
OSTREE_GPG_ERROR_EXPIRED_KEY	A signature was found, but the key used to sign it has expired. Since: 2020.1.
OSTREE_GPG_ERROR_REVOKED_KEY	A signature was found, but the key used to sign it has been revoked. Since: 2020.1.

Since: 2017.10

OstreeGpgVerifyResult

typedef struct OstreeGpgVerifyResult OstreeGpgVerifyResult;

Private instance structure.

enum OstreeGpgSignatureAttr

Signature attributes available from an OstreeGpgVerifyResult. The attribute's GVariantType is shown in brackets.

Members

OSTREE_GPG_SIGNATURE_ATTR_VALID	[G_VARIANT_TYPE_BOOLEAN] Is the signature valid?
OSTREE_GPG_SIGNATURE_ATTR_SIG_EXPIRED	[G_VARIANT_TYPE_BOOLEAN] Has the signature expired?
OSTREE_GPG_SIGNATURE_ATTR_KEY_EXPIRED	[G_VARIANT_TYPE_BOOLEAN] Has the signing key expired?
OSTREE_GPG_SIGNATURE_ATTR_KEY_REVOKED	[G_VARIANT_TYPE_BOOLEAN] Has the signing key been revoked?
OSTREE_GPG_SIGNATURE_ATTR_KEY_MISSING	[G_VARIANT_TYPE_BOOLEAN] Is the signing key missing?
OSTREE_GPG_SIGNATURE_ATTR_FINGERPRINT	[G_VARIANT_TYPE_STRING] Fingerprint of the signing key
OSTREE_GPG_SIGNATURE_ATTR_TIMESTAMP	[G_VARIANT_TYPE_INT64] Signature creation Unix timestamp
OSTREE_GPG_SIGNATURE_ATTR_EXP_TIMESTAMP	[G_VARIANT_TYPE_INT64] Signature expiration Unix timestamp (0 if no expiration)
OSTREE_GPG_SIGNATURE_ATTR_PUBKEY_ALGO_NAME	[G_VARIANT_TYPE_STRING] Name of the public key algorithm used to create the signature
OSTREE_GPG_SIGNATURE_ATTR_HASH_ALGO_NAME	[G_VARIANT_TYPE_STRING] Name of the hash algorithm used to create the signature
OSTREE_GPG_SIGNATURE_ATTR_USER_NAME	[G_VARIANT_TYPE_STRING] The name of the signing key's primary user
OSTREE_GPG_SIGNATURE_ATTR_USER_EMAIL	[G_VARIANT_TYPE_STRING] The email address of the signing key's primary user
OSTREE_GPG_SIGNATURE_ATTR_FINGERPRINT_PRIMARY	[G_VARIANT_TYPE_STRING] Fingerprint of the signing key's primary key (will be the same as OSTREE_GPG_SIGNATURE_ATTR_FINGERPRINT if the the signature is already from the primary key rather than a subkey, and will be the empty string if the key is missing.)
OSTREE_GPG_SIGNATURE_ATTR_KEY_EXP_TIMESTAMP	[G_VARIANT_TYPE_INT64] Key expiration Unix timestamp (0 if no expiration or if the key is missing)
OSTREE_GPG_SIGNATURE_ATTR_KEY_EXP_TIMESTAMP_PRIMARY	[G_VARIANT_TYPE_INT64] Key expiration Unix timestamp of the signing key's primary key (will be the same as OSTREE_GPG_SIGNATURE_ATTR_KEY_EXP_TIMESTAMP if the signing key is the primary key and 0 if no expiration or if the key is missing)

enum OstreeGpgSignatureFormatFlags

Formatting flags for ostree_gpg_verify_result_describe(). Currently there's only one possible output format, but this enumeration allows for future variations.

Members

OSTREE_GPG_SIGNATURE_FORMAT_DEFAULT

Use the default output format