[glib-networking: 39/129] filedatabase: rework the verification of the chain
- From: Michael Catanzaro <mcatanzaro src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [glib-networking: 39/129] filedatabase: rework the verification of the chain
- Date: Sat, 2 Feb 2019 22:46:40 +0000 (UTC)
commit f6a9ac4789de69aec7ef2a4cf7581b7f87a0aaa0
Author: Ignacio Casal Quinteiro <qignacio amazon com>
Date: Sat Apr 29 11:56:46 2017 +0200
filedatabase: rework the verification of the chain
https://bugzilla.gnome.org/show_bug.cgi?id=781854
tls/openssl/gtlsfiledatabase-openssl.c | 315 ++++++++-------------------------
1 file changed, 69 insertions(+), 246 deletions(-)
---
diff --git a/tls/openssl/gtlsfiledatabase-openssl.c b/tls/openssl/gtlsfiledatabase-openssl.c
index 83aa66c..b194efb 100644
--- a/tls/openssl/gtlsfiledatabase-openssl.c
+++ b/tls/openssl/gtlsfiledatabase-openssl.c
@@ -34,6 +34,7 @@ typedef struct _GTlsFileDatabaseOpensslPrivate
{
/* read-only after construct */
gchar *anchor_filename;
+ STACK_OF(X509) *trusted;
/* protected by mutex */
GMutex mutex;
@@ -241,6 +242,9 @@ g_tls_file_database_openssl_finalize (GObject *object)
g_free (priv->anchor_filename);
priv->anchor_filename = NULL;
+ if (priv->trusted != NULL)
+ sk_X509_pop_free (priv->trusted, X509_free);
+
g_mutex_clear (&priv->mutex);
G_OBJECT_CLASS (g_tls_file_database_openssl_parent_class)->finalize (object);
@@ -267,6 +271,51 @@ g_tls_file_database_openssl_get_property (GObject *object,
}
}
+static STACK_OF(X509) *
+load_certs (const gchar *file_name)
+{
+ BIO *bio;
+ STACK_OF(X509) *certs;
+ STACK_OF(X509_INFO) *xis = NULL;
+ gint i;
+
+ bio = BIO_new_file (file_name, "rb");
+ if (bio == NULL)
+ return NULL;
+
+ xis = PEM_X509_INFO_read_bio (bio, NULL, NULL, NULL);
+
+ BIO_free (bio);
+
+ certs = sk_X509_new_null ();
+ if (certs == NULL)
+ goto end;
+
+ for (i = 0; i < sk_X509_INFO_num (xis); i++)
+ {
+ X509_INFO *xi;
+
+ xi = sk_X509_INFO_value (xis, i);
+ if (xi->x509 != NULL)
+ {
+ if (!sk_X509_push (certs, xi->x509))
+ goto end;
+ xi->x509 = NULL;
+ }
+ }
+
+end:
+ sk_X509_INFO_pop_free (xis, X509_INFO_free);
+
+ if (sk_X509_num (certs) == 0)
+ {
+ sk_X509_pop_free (certs, X509_free);
+ certs = NULL;
+ }
+
+ return certs;
+}
+
static void
g_tls_file_database_openssl_set_property (GObject *object,
guint prop_id,
@@ -275,23 +324,30 @@ g_tls_file_database_openssl_set_property (GObject *object,
{
GTlsFileDatabaseOpenssl *file_database = G_TLS_FILE_DATABASE_OPENSSL (object);
GTlsFileDatabaseOpensslPrivate *priv;
- gchar *anchor_path;
+ const gchar *anchor_path;
priv = g_tls_file_database_openssl_get_instance_private (file_database);
switch (prop_id)
{
case PROP_ANCHORS:
- anchor_path = g_value_dup_string (value);
+ anchor_path = g_value_get_string (value);
if (anchor_path && !g_path_is_absolute (anchor_path))
{
- g_warning ("The anchor file name for used with a GTlsFileDatabase "
+ g_warning ("The anchor file name used with a GTlsFileDatabase "
"must be an absolute path, and not relative: %s", anchor_path);
+ return;
}
- else
+
+ if (priv->anchor_filename)
{
- priv->anchor_filename = anchor_path;
+ g_free (priv->anchor_filename);
+ if (priv->trusted != NULL)
+ sk_X509_pop_free (priv->trusted, X509_free);
}
+
+ priv->anchor_filename = g_strdup (anchor_path);
+ priv->trusted = load_certs (anchor_path);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
@@ -468,217 +524,6 @@ g_tls_file_database_openssl_lookup_certificates_issued_by (GTlsDatabase
return issued;
}
-static gboolean
-lookup_assertion (GTlsDatabaseOpenssl *database,
- GTlsCertificateOpenssl *certificate,
- GTlsDatabaseOpensslAssertion assertion,
- const gchar *purpose,
- GSocketConnectable *identity,
- GCancellable *cancellable,
- GError **error)
-{
- GTlsFileDatabaseOpenssl *file_database = G_TLS_FILE_DATABASE_OPENSSL (database);
- GTlsFileDatabaseOpensslPrivate *priv;
- GBytes *der = NULL;
- gboolean contains;
-
- priv = g_tls_file_database_openssl_get_instance_private (file_database);
-
- if (g_cancellable_set_error_if_cancelled (cancellable, error))
- return FALSE;
-
- /* We only have anchored certificate assertions here */
- if (assertion != G_TLS_DATABASE_OPENSSL_ANCHORED_CERTIFICATE)
- return FALSE;
-
- /*
- * TODO: We should be parsing any Extended Key Usage attributes and
- * comparing them to the purpose.
- */
-
- der = g_tls_certificate_openssl_get_bytes (certificate);
-
- g_mutex_lock (&priv->mutex);
- contains = g_hash_table_lookup (priv->complete, der) ? TRUE : FALSE;
- g_mutex_unlock (&priv->mutex);
-
- g_bytes_unref (der);
-
- if (g_cancellable_set_error_if_cancelled (cancellable, error))
- return FALSE;
-
- /* All certificates in our file are anchored certificates */
- return contains;
-}
-
-static gboolean
-is_self_signed (GTlsCertificateOpenssl *certificate)
-{
- X509 *cert;
- X509_STORE *store;
- X509_STORE_CTX *csc;
- STACK_OF(X509) *trusted;
- gboolean ret = FALSE;
-
- store = X509_STORE_new ();
- csc = X509_STORE_CTX_new ();
- cert = g_tls_certificate_openssl_get_cert (certificate);
-
- if (!X509_STORE_CTX_init(csc, store, cert, NULL))
- goto end;
-
- trusted = sk_X509_new_null ();
- sk_X509_push (trusted, cert);
-
- X509_STORE_CTX_trusted_stack (csc, trusted);
- X509_STORE_CTX_set_flags (csc, X509_V_FLAG_CHECK_SS_SIGNATURE);
-
- ret = X509_verify_cert (csc) > 0;
- sk_X509_free (trusted);
-
-end:
- X509_STORE_CTX_cleanup (csc);
- X509_STORE_free (store);
-
- return ret;
-}
-
-static gint
-build_certificate_chain (GTlsDatabaseOpenssl *openssl,
- GTlsCertificateOpenssl *chain,
- const gchar *purpose,
- GSocketConnectable *identity,
- GTlsInteraction *interaction,
- GTlsDatabaseVerifyFlags flags,
- GCancellable *cancellable,
- GTlsCertificateOpenssl **anchor,
- GError **error)
-{
-
- GTlsCertificateOpenssl *certificate;
- GTlsCertificateOpenssl *previous;
- GTlsCertificate *issuer;
- gboolean certificate_is_from_db;
-
- g_assert (anchor);
- g_assert (chain);
- g_assert (purpose);
- g_assert (error);
- g_assert (!*error);
-
- /*
- * Remember that the first certificate never changes in the chain.
- * When we find a self-signed, pinned or anchored certificate, all
- * issuers are truncated from the chain.
- */
-
- *anchor = NULL;
- previous = NULL;
- certificate = chain;
- certificate_is_from_db = FALSE;
-
- /* First check for pinned certificate */
- if (lookup_assertion (openssl, certificate,
- G_TLS_DATABASE_OPENSSL_PINNED_CERTIFICATE,
- purpose, identity, cancellable, error))
- {
- g_tls_certificate_openssl_set_issuer (certificate, NULL);
- return STATUS_PINNED;
- }
- else if (*error)
- {
- return STATUS_FAILURE;
- }
-
- for (;;)
- {
- if (g_cancellable_set_error_if_cancelled (cancellable, error))
- return STATUS_FAILURE;
-
- /* Look up whether this certificate is an anchor */
- if (lookup_assertion (openssl, certificate,
- G_TLS_DATABASE_OPENSSL_ANCHORED_CERTIFICATE,
- purpose, identity, cancellable, error))
- {
- g_tls_certificate_openssl_set_issuer (certificate, NULL);
- *anchor = certificate;
- return STATUS_ANCHORED;
- }
- else if (*error)
- {
- return STATUS_FAILURE;
- }
-
- /* Is it self-signed? */
- if (is_self_signed (certificate))
- {
- /*
- * Since at this point we would fail with 'self-signed', can we replace
- * this certificate with one from the database and do better?
- */
- if (previous && !certificate_is_from_db)
- {
- issuer = g_tls_database_lookup_certificate_issuer (G_TLS_DATABASE (openssl),
- G_TLS_CERTIFICATE (previous),
- interaction,
- G_TLS_DATABASE_LOOKUP_NONE,
- cancellable, error);
- if (*error)
- {
- return STATUS_FAILURE;
- }
- else if (issuer)
- {
- /* Replaced with certificate in the db, restart step again with this certificate */
- g_return_val_if_fail (G_IS_TLS_CERTIFICATE_OPENSSL (issuer), STATUS_FAILURE);
- g_tls_certificate_openssl_set_issuer (previous, G_TLS_CERTIFICATE_OPENSSL (issuer));
- certificate = G_TLS_CERTIFICATE_OPENSSL (issuer);
- certificate_is_from_db = TRUE;
- g_object_unref (issuer);
- continue;
- }
- }
-
- g_tls_certificate_openssl_set_issuer (certificate, NULL);
- return STATUS_SELFSIGNED;
- }
-
- previous = certificate;
-
- /* Bring over the next certificate in the chain */
- issuer = g_tls_certificate_get_issuer (G_TLS_CERTIFICATE (certificate));
- if (issuer)
- {
- g_return_val_if_fail (G_IS_TLS_CERTIFICATE_OPENSSL (issuer), STATUS_FAILURE);
- certificate = G_TLS_CERTIFICATE_OPENSSL (issuer);
- certificate_is_from_db = FALSE;
- }
-
- /* Search for the next certificate in chain */
- else
- {
- issuer = g_tls_database_lookup_certificate_issuer (G_TLS_DATABASE (openssl),
- G_TLS_CERTIFICATE (certificate),
- interaction,
- G_TLS_DATABASE_LOOKUP_NONE,
- cancellable, error);
- if (*error)
- return STATUS_FAILURE;
- else if (!issuer)
- return STATUS_INCOMPLETE;
-
- /* Found a certificate in chain, use for next step */
- g_return_val_if_fail (G_IS_TLS_CERTIFICATE_OPENSSL (issuer), STATUS_FAILURE);
- g_tls_certificate_openssl_set_issuer (certificate, G_TLS_CERTIFICATE_OPENSSL (issuer));
- certificate = G_TLS_CERTIFICATE_OPENSSL (issuer);
- certificate_is_from_db = TRUE;
- g_object_unref (issuer);
- }
- }
-
- g_assert_not_reached ();
-}
-
static GTlsCertificateFlags
double_check_before_after_dates (GTlsCertificateOpenssl *chain)
{
@@ -731,36 +576,20 @@ g_tls_file_database_openssl_verify_chain (GTlsDatabase *database,
GCancellable *cancellable,
GError **error)
{
- GTlsDatabaseOpenssl *openssl;
- GTlsCertificateOpenssl *anchor;
- STACK_OF(X509) *certs, *anchors;
+ GTlsFileDatabaseOpenssl *file_database;
+ GTlsFileDatabaseOpensslPrivate *priv;
+ STACK_OF(X509) *certs;
X509_STORE *store;
X509_STORE_CTX *csc;
X509 *x;
- gint status;
GTlsCertificateFlags result = 0;
- GError *err = NULL;
g_return_val_if_fail (G_IS_TLS_CERTIFICATE_OPENSSL (chain),
G_TLS_CERTIFICATE_GENERIC_ERROR);
- openssl = G_TLS_DATABASE_OPENSSL (database);
- anchor = NULL;
+ file_database = G_TLS_FILE_DATABASE_OPENSSL (database);
- status = build_certificate_chain (openssl, G_TLS_CERTIFICATE_OPENSSL (chain), purpose,
- identity, interaction, flags, cancellable, &anchor, &err);
- if (status == STATUS_FAILURE)
- {
- g_propagate_error (error, err);
- return G_TLS_CERTIFICATE_GENERIC_ERROR;
- }
-
- /*
- * A pinned certificate is verified on its own, without any further
- * verification.
- */
- if (status == STATUS_PINNED)
- return 0;
+ priv = g_tls_file_database_openssl_get_instance_private (file_database);
if (g_cancellable_set_error_if_cancelled (cancellable, error))
return G_TLS_CERTIFICATE_GENERIC_ERROR;
@@ -771,7 +600,7 @@ g_tls_file_database_openssl_verify_chain (GTlsDatabase *database,
csc = X509_STORE_CTX_new ();
x = g_tls_certificate_openssl_get_cert (G_TLS_CERTIFICATE_OPENSSL (chain));
- if (!X509_STORE_CTX_init(csc, store, x, certs))
+ if (!X509_STORE_CTX_init (csc, store, x, certs))
{
X509_STORE_CTX_cleanup (csc);
X509_STORE_free (store);
@@ -779,14 +608,10 @@ g_tls_file_database_openssl_verify_chain (GTlsDatabase *database,
return G_TLS_CERTIFICATE_GENERIC_ERROR;
}
- if (anchor)
+ if (priv->trusted)
{
- g_assert (g_tls_certificate_get_issuer (G_TLS_CERTIFICATE (anchor)) == NULL);
- anchors = convert_certificate_chain_to_openssl (G_TLS_CERTIFICATE_OPENSSL (anchor));
- X509_STORE_CTX_trusted_stack (csc, anchors);
+ X509_STORE_CTX_trusted_stack (csc, priv->trusted);
}
- else
- anchors = NULL;
if (X509_verify_cert (csc) <= 0)
result = g_tls_certificate_openssl_convert_error (X509_STORE_CTX_get_error (csc));
@@ -794,8 +619,6 @@ g_tls_file_database_openssl_verify_chain (GTlsDatabase *database,
X509_STORE_CTX_cleanup (csc);
X509_STORE_free (store);
sk_X509_free (certs);
- if (anchors)
- sk_X509_free (anchors);
if (g_cancellable_set_error_if_cancelled (cancellable, error))
return G_TLS_CERTIFICATE_GENERIC_ERROR;
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