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-rw-r--r--crypto/Makefile.objs1
-rw-r--r--crypto/tls-cipher-suites.c126
-rw-r--r--crypto/trace-events5
-rw-r--r--docs/specs/fw_cfg.txt13
-rw-r--r--hw/nvram/fw_cfg.c35
-rw-r--r--include/crypto/tls-cipher-suites.h39
-rw-r--r--include/hw/nvram/fw_cfg.h43
-rw-r--r--qemu-options.hx37
-rw-r--r--softmmu/vl.c37
9 files changed, 326 insertions, 10 deletions
diff --git a/crypto/Makefile.objs b/crypto/Makefile.objs
index 707c02ad37..f1965b1a68 100644
--- a/crypto/Makefile.objs
+++ b/crypto/Makefile.objs
@@ -13,6 +13,7 @@ crypto-obj-y += cipher.o
crypto-obj-$(CONFIG_AF_ALG) += afalg.o
crypto-obj-$(CONFIG_AF_ALG) += cipher-afalg.o
crypto-obj-$(CONFIG_AF_ALG) += hash-afalg.o
+crypto-obj-$(CONFIG_GNUTLS) += tls-cipher-suites.o
crypto-obj-y += tlscreds.o
crypto-obj-y += tlscredsanon.o
crypto-obj-y += tlscredspsk.o
diff --git a/crypto/tls-cipher-suites.c b/crypto/tls-cipher-suites.c
new file mode 100644
index 0000000000..0d305b684b
--- /dev/null
+++ b/crypto/tls-cipher-suites.c
@@ -0,0 +1,126 @@
+/*
+ * QEMU TLS Cipher Suites
+ *
+ * Copyright (c) 2018-2020 Red Hat, Inc.
+ *
+ * Author: Philippe Mathieu-Daudé <philmd@redhat.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qom/object_interfaces.h"
+#include "crypto/tlscreds.h"
+#include "crypto/tls-cipher-suites.h"
+#include "hw/nvram/fw_cfg.h"
+#include "trace.h"
+
+/*
+ * IANA registered TLS ciphers:
+ * https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-4
+ */
+typedef struct {
+ uint8_t data[2];
+} QEMU_PACKED IANA_TLS_CIPHER;
+
+GByteArray *qcrypto_tls_cipher_suites_get_data(QCryptoTLSCipherSuites *obj,
+ Error **errp)
+{
+ QCryptoTLSCreds *creds = QCRYPTO_TLS_CREDS(obj);
+ gnutls_priority_t pcache;
+ GByteArray *byte_array;
+ const char *err;
+ size_t i;
+ int ret;
+
+ trace_qcrypto_tls_cipher_suite_priority(creds->priority);
+ ret = gnutls_priority_init(&pcache, creds->priority, &err);
+ if (ret < 0) {
+ error_setg(errp, "Syntax error using priority '%s': %s",
+ creds->priority, gnutls_strerror(ret));
+ return NULL;
+ }
+
+ byte_array = g_byte_array_new();
+
+ for (i = 0;; i++) {
+ int ret;
+ unsigned idx;
+ const char *name;
+ IANA_TLS_CIPHER cipher;
+ gnutls_protocol_t protocol;
+ const char *version;
+
+ ret = gnutls_priority_get_cipher_suite_index(pcache, i, &idx);
+ if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
+ break;
+ }
+ if (ret == GNUTLS_E_UNKNOWN_CIPHER_SUITE) {
+ continue;
+ }
+
+ name = gnutls_cipher_suite_info(idx, (unsigned char *)&cipher,
+ NULL, NULL, NULL, &protocol);
+ if (name == NULL) {
+ continue;
+ }
+
+ version = gnutls_protocol_get_name(protocol);
+ g_byte_array_append(byte_array, cipher.data, 2);
+ trace_qcrypto_tls_cipher_suite_info(cipher.data[0],
+ cipher.data[1],
+ version, name);
+ }
+ trace_qcrypto_tls_cipher_suite_count(byte_array->len);
+ gnutls_priority_deinit(pcache);
+
+ return byte_array;
+}
+
+static void qcrypto_tls_cipher_suites_complete(UserCreatable *uc,
+ Error **errp)
+{
+ QCryptoTLSCreds *creds = QCRYPTO_TLS_CREDS(uc);
+
+ if (!creds->priority) {
+ error_setg(errp, "'priority' property is not set");
+ return;
+ }
+}
+
+static GByteArray *qcrypto_tls_cipher_suites_fw_cfg_gen_data(Object *obj,
+ Error **errp)
+{
+ return qcrypto_tls_cipher_suites_get_data(QCRYPTO_TLS_CIPHER_SUITES(obj),
+ errp);
+}
+
+static void qcrypto_tls_cipher_suites_class_init(ObjectClass *oc, void *data)
+{
+ UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
+ FWCfgDataGeneratorClass *fwgc = FW_CFG_DATA_GENERATOR_CLASS(oc);
+
+ ucc->complete = qcrypto_tls_cipher_suites_complete;
+ fwgc->get_data = qcrypto_tls_cipher_suites_fw_cfg_gen_data;
+}
+
+static const TypeInfo qcrypto_tls_cipher_suites_info = {
+ .parent = TYPE_QCRYPTO_TLS_CREDS,
+ .name = TYPE_QCRYPTO_TLS_CIPHER_SUITES,
+ .instance_size = sizeof(QCryptoTLSCreds),
+ .class_size = sizeof(QCryptoTLSCredsClass),
+ .class_init = qcrypto_tls_cipher_suites_class_init,
+ .interfaces = (InterfaceInfo[]) {
+ { TYPE_USER_CREATABLE },
+ { TYPE_FW_CFG_DATA_GENERATOR_INTERFACE },
+ { }
+ }
+};
+
+static void qcrypto_tls_cipher_suites_register_types(void)
+{
+ type_register_static(&qcrypto_tls_cipher_suites_info);
+}
+
+type_init(qcrypto_tls_cipher_suites_register_types);
diff --git a/crypto/trace-events b/crypto/trace-events
index 9e594d30e8..798b6067ab 100644
--- a/crypto/trace-events
+++ b/crypto/trace-events
@@ -21,3 +21,8 @@ qcrypto_tls_creds_x509_load_cert_list(void *creds, const char *file) "TLS creds
# tlssession.c
qcrypto_tls_session_new(void *session, void *creds, const char *hostname, const char *authzid, int endpoint) "TLS session new session=%p creds=%p hostname=%s authzid=%s endpoint=%d"
qcrypto_tls_session_check_creds(void *session, const char *status) "TLS session check creds session=%p status=%s"
+
+# tls-cipher-suites.c
+qcrypto_tls_cipher_suite_priority(const char *name) "priority: %s"
+qcrypto_tls_cipher_suite_info(uint8_t data0, uint8_t data1, const char *version, const char *name) "data=[0x%02x,0x%02x] version=%s name=%s"
+qcrypto_tls_cipher_suite_count(unsigned count) "count: %u"
diff --git a/docs/specs/fw_cfg.txt b/docs/specs/fw_cfg.txt
index 8f1ebc66fa..3e6d586f66 100644
--- a/docs/specs/fw_cfg.txt
+++ b/docs/specs/fw_cfg.txt
@@ -219,7 +219,7 @@ To check the result, read the "control" field:
= Externally Provided Items =
-As of v2.4, "file" fw_cfg items (i.e., items with selector keys above
+Since v2.4, "file" fw_cfg items (i.e., items with selector keys above
FW_CFG_FILE_FIRST, and with a corresponding entry in the fw_cfg file
directory structure) may be inserted via the QEMU command line, using
the following syntax:
@@ -230,6 +230,13 @@ Or
-fw_cfg [name=]<item_name>,string=<string>
+Since v5.1, QEMU allows some objects to generate fw_cfg-specific content,
+the content is then associated with a "file" item using the 'gen_id' option
+in the command line, using the following syntax:
+
+ -object <generator-type>,id=<generated_id>,[generator-specific-options] \
+ -fw_cfg [name=]<item_name>,gen_id=<generated_id>
+
See QEMU man page for more documentation.
Using item_name with plain ASCII characters only is recommended.
@@ -251,4 +258,8 @@ Prefix "opt/org.qemu/" is reserved for QEMU itself.
Use of names not beginning with "opt/" is potentially dangerous and
entirely unsupported. QEMU will warn if you try.
+Use of names not beginning with "opt/" is tolerated with 'gen_id' (that
+is, the warning is suppressed), but you must know exactly what you're
+doing.
+
All externally provided fw_cfg items are read-only to the guest.
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index 0408a31f8e..694722b212 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -1032,6 +1032,35 @@ void *fw_cfg_modify_file(FWCfgState *s, const char *filename,
return NULL;
}
+void fw_cfg_add_from_generator(FWCfgState *s, const char *filename,
+ const char *gen_id, Error **errp)
+{
+ FWCfgDataGeneratorClass *klass;
+ Error *local_err = NULL;
+ GByteArray *array;
+ Object *obj;
+ gsize size;
+
+ obj = object_resolve_path_component(object_get_objects_root(), gen_id);
+ if (!obj) {
+ error_setg(errp, "Cannot find object ID '%s'", gen_id);
+ return;
+ }
+ if (!object_dynamic_cast(obj, TYPE_FW_CFG_DATA_GENERATOR_INTERFACE)) {
+ error_setg(errp, "Object ID '%s' is not a '%s' subclass",
+ gen_id, TYPE_FW_CFG_DATA_GENERATOR_INTERFACE);
+ return;
+ }
+ klass = FW_CFG_DATA_GENERATOR_GET_CLASS(obj);
+ array = klass->get_data(obj, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+ size = array->len;
+ fw_cfg_add_file(s, filename, g_byte_array_free(array, TRUE), size);
+}
+
static void fw_cfg_machine_reset(void *opaque)
{
MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
@@ -1333,12 +1362,18 @@ static const TypeInfo fw_cfg_mem_info = {
.class_init = fw_cfg_mem_class_init,
};
+static const TypeInfo fw_cfg_data_generator_interface_info = {
+ .parent = TYPE_INTERFACE,
+ .name = TYPE_FW_CFG_DATA_GENERATOR_INTERFACE,
+ .class_size = sizeof(FWCfgDataGeneratorClass),
+};
static void fw_cfg_register_types(void)
{
type_register_static(&fw_cfg_info);
type_register_static(&fw_cfg_io_info);
type_register_static(&fw_cfg_mem_info);
+ type_register_static(&fw_cfg_data_generator_interface_info);
}
type_init(fw_cfg_register_types)
diff --git a/include/crypto/tls-cipher-suites.h b/include/crypto/tls-cipher-suites.h
new file mode 100644
index 0000000000..28b3a73ce1
--- /dev/null
+++ b/include/crypto/tls-cipher-suites.h
@@ -0,0 +1,39 @@
+/*
+ * QEMU TLS Cipher Suites Registry (RFC8447)
+ *
+ * Copyright (c) 2018-2020 Red Hat, Inc.
+ *
+ * Author: Philippe Mathieu-Daudé <philmd@redhat.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef QCRYPTO_TLSCIPHERSUITES_H
+#define QCRYPTO_TLSCIPHERSUITES_H
+
+#include "qom/object.h"
+#include "crypto/tlscreds.h"
+
+#define TYPE_QCRYPTO_TLS_CIPHER_SUITES "tls-cipher-suites"
+#define QCRYPTO_TLS_CIPHER_SUITES(obj) \
+ OBJECT_CHECK(QCryptoTLSCipherSuites, (obj), TYPE_QCRYPTO_TLS_CIPHER_SUITES)
+
+typedef struct QCryptoTLSCipherSuites {
+ /* <private> */
+ QCryptoTLSCreds parent_obj;
+ /* <public> */
+} QCryptoTLSCipherSuites;
+
+/**
+ * qcrypto_tls_cipher_suites_get_data:
+ * @obj: pointer to a TLS cipher suites object
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Returns: reference to a byte array containing the data.
+ * The caller should release the reference when no longer
+ * required.
+ */
+GByteArray *qcrypto_tls_cipher_suites_get_data(QCryptoTLSCipherSuites *obj,
+ Error **errp);
+
+#endif /* QCRYPTO_TLSCIPHERSUITES_H */
diff --git a/include/hw/nvram/fw_cfg.h b/include/hw/nvram/fw_cfg.h
index 25d9307018..11feae3177 100644
--- a/include/hw/nvram/fw_cfg.h
+++ b/include/hw/nvram/fw_cfg.h
@@ -9,11 +9,36 @@
#define TYPE_FW_CFG "fw_cfg"
#define TYPE_FW_CFG_IO "fw_cfg_io"
#define TYPE_FW_CFG_MEM "fw_cfg_mem"
+#define TYPE_FW_CFG_DATA_GENERATOR_INTERFACE "fw_cfg-data-generator"
#define FW_CFG(obj) OBJECT_CHECK(FWCfgState, (obj), TYPE_FW_CFG)
#define FW_CFG_IO(obj) OBJECT_CHECK(FWCfgIoState, (obj), TYPE_FW_CFG_IO)
#define FW_CFG_MEM(obj) OBJECT_CHECK(FWCfgMemState, (obj), TYPE_FW_CFG_MEM)
+#define FW_CFG_DATA_GENERATOR_CLASS(class) \
+ OBJECT_CLASS_CHECK(FWCfgDataGeneratorClass, (class), \
+ TYPE_FW_CFG_DATA_GENERATOR_INTERFACE)
+#define FW_CFG_DATA_GENERATOR_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(FWCfgDataGeneratorClass, (obj), \
+ TYPE_FW_CFG_DATA_GENERATOR_INTERFACE)
+
+typedef struct FWCfgDataGeneratorClass {
+ /*< private >*/
+ InterfaceClass parent_class;
+ /*< public >*/
+
+ /**
+ * get_data:
+ * @obj: the object implementing this interface
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Returns: reference to a byte array containing the data.
+ * The caller should release the reference when no longer
+ * required.
+ */
+ GByteArray *(*get_data)(Object *obj, Error **errp);
+} FWCfgDataGeneratorClass;
+
typedef struct fw_cfg_file FWCfgFile;
#define FW_CFG_ORDER_OVERRIDE_VGA 70
@@ -263,6 +288,24 @@ void fw_cfg_add_file_callback(FWCfgState *s, const char *filename,
void *fw_cfg_modify_file(FWCfgState *s, const char *filename, void *data,
size_t len);
+/**
+ * fw_cfg_add_from_generator:
+ * @s: fw_cfg device being modified
+ * @filename: name of new fw_cfg file item
+ * @gen_id: name of object implementing FW_CFG_DATA_GENERATOR interface
+ * @errp: pointer to a NULL initialized error object
+ *
+ * Add a new NAMED fw_cfg item with the content generated from the
+ * @gen_id object. The data generated by the @gen_id object is copied
+ * into the data structure of the fw_cfg device.
+ * The next available (unused) selector key starting at FW_CFG_FILE_FIRST
+ * will be used; also, a new entry will be added to the file directory
+ * structure residing at key value FW_CFG_FILE_DIR, containing the item name,
+ * data size, and assigned selector key value.
+ */
+void fw_cfg_add_from_generator(FWCfgState *s, const char *filename,
+ const char *gen_id, Error **errp);
+
FWCfgState *fw_cfg_init_io_dma(uint32_t iobase, uint32_t dma_iobase,
AddressSpace *dma_as);
FWCfgState *fw_cfg_init_io(uint32_t iobase);
diff --git a/qemu-options.hx b/qemu-options.hx
index fa1b19de4c..c6edb4047b 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4579,6 +4579,43 @@ SRST
string as described at
https://gnutls.org/manual/html_node/Priority-Strings.html.
+ ``-object tls-cipher-suites,id=id,priority=priority``
+ Creates a TLS cipher suites object, which can be used to control
+ the TLS cipher/protocol algorithms that applications are permitted
+ to use.
+
+ The ``id`` parameter is a unique ID which frontends will use to
+ access the ordered list of permitted TLS cipher suites from the
+ host.
+
+ The ``priority`` parameter allows to override the global default
+ priority used by gnutls. This can be useful if the system
+ administrator needs to use a weaker set of crypto priorities for
+ QEMU without potentially forcing the weakness onto all
+ applications. Or conversely if one wants wants a stronger
+ default for QEMU than for all other applications, they can do
+ this through this parameter. Its format is a gnutls priority
+ string as described at
+ https://gnutls.org/manual/html_node/Priority-Strings.html.
+
+ An example of use of this object is to control UEFI HTTPS Boot.
+ The tls-cipher-suites object exposes the ordered list of permitted
+ TLS cipher suites from the host side to the guest firmware, via
+ fw_cfg. The list is represented as an array of IANA_TLS_CIPHER
+ objects. The firmware uses the IANA_TLS_CIPHER array for configuring
+ guest-side TLS.
+
+ In the following example, the priority at which the host-side policy
+ is retrieved is given by the ``priority`` property.
+ Given that QEMU uses GNUTLS, ``priority=@SYSTEM`` may be used to
+ refer to /etc/crypto-policies/back-ends/gnutls.config.
+
+ .. parsed-literal::
+
+ # |qemu_system| \
+ -object tls-cipher-suites,id=mysuite0,priority=@SYSTEM \
+ -fw_cfg name=etc/edk2/https/ciphers,gen_id=mysuite0
+
``-object filter-buffer,id=id,netdev=netdevid,interval=t[,queue=all|rx|tx][,status=on|off][,position=head|tail|id=<id>][,insert=behind|before]``
Interval t can't be 0, this filter batches the packet delivery:
all packets arriving in a given interval on netdev netdevid are
diff --git a/softmmu/vl.c b/softmmu/vl.c
index 3f58ffd4dc..f3ff5d06ca 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -489,6 +489,11 @@ static QemuOptsList qemu_fw_cfg_opts = {
.name = "string",
.type = QEMU_OPT_STRING,
.help = "Sets content of the blob to be inserted from a string",
+ }, {
+ .name = "gen_id",
+ .type = QEMU_OPT_STRING,
+ .help = "Sets id of the object generating the fw_cfg blob "
+ "to be inserted",
},
{ /* end of list */ }
},
@@ -2020,7 +2025,7 @@ static int parse_fw_cfg(void *opaque, QemuOpts *opts, Error **errp)
{
gchar *buf;
size_t size;
- const char *name, *file, *str;
+ const char *name, *file, *str, *gen_id;
FWCfgState *fw_cfg = (FWCfgState *) opaque;
if (fw_cfg == NULL) {
@@ -2030,14 +2035,13 @@ static int parse_fw_cfg(void *opaque, QemuOpts *opts, Error **errp)
name = qemu_opt_get(opts, "name");
file = qemu_opt_get(opts, "file");
str = qemu_opt_get(opts, "string");
+ gen_id = qemu_opt_get(opts, "gen_id");
- /* we need name and either a file or the content string */
- if (!(nonempty_str(name) && (nonempty_str(file) || nonempty_str(str)))) {
- error_setg(errp, "invalid argument(s)");
- return -1;
- }
- if (nonempty_str(file) && nonempty_str(str)) {
- error_setg(errp, "file and string are mutually exclusive");
+ /* we need the name, and exactly one of: file, content string, gen_id */
+ if (!nonempty_str(name) ||
+ nonempty_str(file) + nonempty_str(str) + nonempty_str(gen_id) != 1) {
+ error_setg(errp, "name, plus exactly one of file,"
+ " string and gen_id, are needed");
return -1;
}
if (strlen(name) > FW_CFG_MAX_FILE_PATH - 1) {
@@ -2045,13 +2049,28 @@ static int parse_fw_cfg(void *opaque, QemuOpts *opts, Error **errp)
FW_CFG_MAX_FILE_PATH - 1);
return -1;
}
- if (strncmp(name, "opt/", 4) != 0) {
+ if (nonempty_str(gen_id)) {
+ /*
+ * In this particular case where the content is populated
+ * internally, the "etc/" namespace protection is relaxed,
+ * so do not emit a warning.
+ */
+ } else if (strncmp(name, "opt/", 4) != 0) {
warn_report("externally provided fw_cfg item names "
"should be prefixed with \"opt/\"");
}
if (nonempty_str(str)) {
size = strlen(str); /* NUL terminator NOT included in fw_cfg blob */
buf = g_memdup(str, size);
+ } else if (nonempty_str(gen_id)) {
+ Error *local_err = NULL;
+
+ fw_cfg_add_from_generator(fw_cfg, name, gen_id, errp);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return -1;
+ }
+ return 0;
} else {
GError *err = NULL;
if (!g_file_get_contents(file, &buf, &size, &err)) {
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-01 09:39:37 +0000