On 06/23/20 19:27, Philippe Mathieu-Daudé wrote:
> Since our format is consumable by the fw_cfg device,
> we can implement the FW_CFG_DATA_GENERATOR interface.
>
> Example of use to dump the cipher suites (if tracing enabled):
>
> $ qemu-system-x86_64 -S \
> -object tls-cipher-suites,id=mysuite1,priority=@SYSTEM \
> -fw_cfg name=etc/path/to/ciphers,gen_id=mysuite1 \
> -trace qcrypto\*
> 1590664444.197123:qcrypto_tls_cipher_suite_priority priority: @SYSTEM
> 1590664444.197219:qcrypto_tls_cipher_suite_info data=[0x13,0x02]
> version=TLS1.3 name=TLS_AES_256_GCM_SHA384
> 1590664444.197228:qcrypto_tls_cipher_suite_info data=[0x13,0x03]
> version=TLS1.3 name=TLS_CHACHA20_POLY1305_SHA256
> 1590664444.197233:qcrypto_tls_cipher_suite_info data=[0x13,0x01]
> version=TLS1.3 name=TLS_AES_128_GCM_SHA256
> 1590664444.197236:qcrypto_tls_cipher_suite_info data=[0x13,0x04]
> version=TLS1.3 name=TLS_AES_128_CCM_SHA256
> 1590664444.197240:qcrypto_tls_cipher_suite_info data=[0xc0,0x30]
> version=TLS1.2 name=TLS_ECDHE_RSA_AES_256_GCM_SHA384
> 1590664444.197245:qcrypto_tls_cipher_suite_info data=[0xcc,0xa8]
> version=TLS1.2 name=TLS_ECDHE_RSA_CHACHA20_POLY1305
> 1590664444.197250:qcrypto_tls_cipher_suite_info data=[0xc0,0x14]
> version=TLS1.0 name=TLS_ECDHE_RSA_AES_256_CBC_SHA1
> 1590664444.197254:qcrypto_tls_cipher_suite_info data=[0xc0,0x2f]
> version=TLS1.2 name=TLS_ECDHE_RSA_AES_128_GCM_SHA256
> 1590664444.197258:qcrypto_tls_cipher_suite_info data=[0xc0,0x13]
> version=TLS1.0 name=TLS_ECDHE_RSA_AES_128_CBC_SHA1
> 1590664444.197261:qcrypto_tls_cipher_suite_info data=[0xc0,0x2c]
> version=TLS1.2 name=TLS_ECDHE_ECDSA_AES_256_GCM_SHA384
> 1590664444.197266:qcrypto_tls_cipher_suite_info data=[0xcc,0xa9]
> version=TLS1.2 name=TLS_ECDHE_ECDSA_CHACHA20_POLY1305
> 1590664444.197270:qcrypto_tls_cipher_suite_info data=[0xc0,0xad]
> version=TLS1.2 name=TLS_ECDHE_ECDSA_AES_256_CCM
> 1590664444.197274:qcrypto_tls_cipher_suite_info data=[0xc0,0x0a]
> version=TLS1.0 name=TLS_ECDHE_ECDSA_AES_256_CBC_SHA1
> 1590664444.197278:qcrypto_tls_cipher_suite_info data=[0xc0,0x2b]
> version=TLS1.2 name=TLS_ECDHE_ECDSA_AES_128_GCM_SHA256
> 1590664444.197283:qcrypto_tls_cipher_suite_info data=[0xc0,0xac]
> version=TLS1.2 name=TLS_ECDHE_ECDSA_AES_128_CCM
> 1590664444.197287:qcrypto_tls_cipher_suite_info data=[0xc0,0x09]
> version=TLS1.0 name=TLS_ECDHE_ECDSA_AES_128_CBC_SHA1
> 1590664444.197291:qcrypto_tls_cipher_suite_info data=[0x00,0x9d]
> version=TLS1.2 name=TLS_RSA_AES_256_GCM_SHA384
> 1590664444.197296:qcrypto_tls_cipher_suite_info data=[0xc0,0x9d]
> version=TLS1.2 name=TLS_RSA_AES_256_CCM
> 1590664444.197300:qcrypto_tls_cipher_suite_info data=[0x00,0x35]
> version=TLS1.0 name=TLS_RSA_AES_256_CBC_SHA1
> 1590664444.197304:qcrypto_tls_cipher_suite_info data=[0x00,0x9c]
> version=TLS1.2 name=TLS_RSA_AES_128_GCM_SHA256
> 1590664444.197308:qcrypto_tls_cipher_suite_info data=[0xc0,0x9c]
> version=TLS1.2 name=TLS_RSA_AES_128_CCM
> 1590664444.197312:qcrypto_tls_cipher_suite_info data=[0x00,0x2f]
> version=TLS1.0 name=TLS_RSA_AES_128_CBC_SHA1
> 1590664444.197316:qcrypto_tls_cipher_suite_info data=[0x00,0x9f]
> version=TLS1.2 name=TLS_DHE_RSA_AES_256_GCM_SHA384
> 1590664444.197320:qcrypto_tls_cipher_suite_info data=[0xcc,0xaa]
> version=TLS1.2 name=TLS_DHE_RSA_CHACHA20_POLY1305
> 1590664444.197325:qcrypto_tls_cipher_suite_info data=[0xc0,0x9f]
> version=TLS1.2 name=TLS_DHE_RSA_AES_256_CCM
> 1590664444.197329:qcrypto_tls_cipher_suite_info data=[0x00,0x39]
> version=TLS1.0 name=TLS_DHE_RSA_AES_256_CBC_SHA1
> 1590664444.197333:qcrypto_tls_cipher_suite_info data=[0x00,0x9e]
> version=TLS1.2 name=TLS_DHE_RSA_AES_128_GCM_SHA256
> 1590664444.197337:qcrypto_tls_cipher_suite_info data=[0xc0,0x9e]
> version=TLS1.2 name=TLS_DHE_RSA_AES_128_CCM
> 1590664444.197341:qcrypto_tls_cipher_suite_info data=[0x00,0x33]
> version=TLS1.0 name=TLS_DHE_RSA_AES_128_CBC_SHA1
> 1590664444.197345:qcrypto_tls_cipher_suite_count count: 29
>
> Signed-off-by: Philippe Mathieu-Daudé <phi...@redhat.com>
> ---
> v10: Removed Laszlo Acked-by due to logical changes
> ---
> crypto/tls-cipher-suites.c | 11 +++++++++++
> qemu-options.hx | 18 ++++++++++++++++++
> 2 files changed, 29 insertions(+)
>
> diff --git a/crypto/tls-cipher-suites.c b/crypto/tls-cipher-suites.c
> index 5b403f86c9..b3dba00010 100644
> --- a/crypto/tls-cipher-suites.c
> +++ b/crypto/tls-cipher-suites.c
> @@ -13,6 +13,7 @@
> #include "qom/object_interfaces.h"
> #include "crypto/tlscreds.h"
> #include "crypto/tls-cipher-suites.h"
> +#include "hw/nvram/fw_cfg.h"
> #include "trace.h"
>
> /*
> @@ -88,11 +89,20 @@ static void
> qcrypto_tls_cipher_suites_complete(UserCreatable *uc,
> }
> }
>
> +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 = {
> @@ -103,6 +113,7 @@ static const TypeInfo qcrypto_tls_cipher_suites_info = {
> .class_init = qcrypto_tls_cipher_suites_class_init,
> .interfaces = (InterfaceInfo[]) {
> { TYPE_USER_CREATABLE },
> + { TYPE_FW_CFG_DATA_GENERATOR_INTERFACE },
> { }
> }
> };
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 4f519f35fd..ce54c7359c 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -4585,6 +4585,24 @@ SRST
> 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
>
Acked-by: Laszlo Ersek <ler...@redhat.com>
