[libvirt] [PATCH v8 2/5] conf: Introduce {default|chardev}_tls_x509_secret_uuid
Pavel Hrdina
phrdina at redhat.com
Fri Oct 14 14:53:44 UTC 2016
On Fri, Oct 07, 2016 at 07:00:27AM -0400, John Ferlan wrote:
> Add a new qemu.conf variables to store the UUID for the secret that could
> be used to present credentials to access the TLS chardev. Since this will
> be a server level and it's possible to use some sort of default, introduce
> both the default and chardev logic at the same time making the setting of
> the chardev check for it's own value, then if not present checking whether
> the default value had been set.
>
> The chardevTLSx509haveUUID bool will be used as the marker for whether
> the chardevTLSx509secretUUID was successfully read. In the future this
> is how it'd determined whether to add the secret object for a TLS object.
>
> Signed-off-by: John Ferlan <jferlan at redhat.com>
> ---
> src/qemu/libvirtd_qemu.aug | 2 ++
> src/qemu/qemu.conf | 24 ++++++++++++++++++++++++
> src/qemu/qemu_conf.c | 22 ++++++++++++++++++++++
> src/qemu/qemu_conf.h | 3 +++
> src/qemu/test_libvirtd_qemu.aug.in | 2 ++
> 5 files changed, 53 insertions(+)
>
> diff --git a/src/qemu/libvirtd_qemu.aug b/src/qemu/libvirtd_qemu.aug
> index 988201e..73ebeda 100644
> --- a/src/qemu/libvirtd_qemu.aug
> +++ b/src/qemu/libvirtd_qemu.aug
> @@ -29,6 +29,7 @@ module Libvirtd_qemu =
> (* Config entry grouped by function - same order as example config *)
> let default_tls_entry = str_entry "default_tls_x509_cert_dir"
> | bool_entry "default_tls_x509_verify"
> + | str_entry "default_tls_x509_secret_uuid"
>
> let vnc_entry = str_entry "vnc_listen"
> | bool_entry "vnc_auto_unix_socket"
> @@ -51,6 +52,7 @@ module Libvirtd_qemu =
> let chardev_entry = bool_entry "chardev_tls"
> | str_entry "chardev_tls_x509_cert_dir"
> | bool_entry "chardev_tls_x509_verify"
> + | str_entry "chardev_tls_x509_secret_uuid"
>
> let nogfx_entry = bool_entry "nographics_allow_host_audio"
>
> diff --git a/src/qemu/qemu.conf b/src/qemu/qemu.conf
> index e4c2aae..f136fa9 100644
> --- a/src/qemu/qemu.conf
> +++ b/src/qemu/qemu.conf
> @@ -28,6 +28,20 @@
> #
> #default_tls_x509_verify = 1
>
> +#
> +# Libvirt assumes the server-key.pem file is unencrypted by default.
> +# To use an encrypted server-key.pem file, the password to decrypt the
s/ the//
> +# the PEM file is requird. This can be provided by creating a secret
> +# object in libvirt and then uncommenting this setting to set the UUID
> +# UUID of the secret.
> +#
> +# NB This default all-zeros UUID will not work. Replace it with the
> +# output from the UUID for the TLS secret from a 'virsh secret-list'
> +# command and then uncomment the entry
> +#
> +#default_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"
> +
> +
> # VNC is configured to listen on 127.0.0.1 by default.
> # To make it listen on all public interfaces, uncomment
> # this next option.
> @@ -214,6 +228,16 @@
> #chardev_tls_x509_verify = 1
>
>
> +# Uncomment and use the following option to override the default secret
> +# uuid provided in the default_tls_x509_secret_uuid parameter.
> +#
> +# NB This default all-zeros UUID will not work. Replace it with the
> +# output from the UUID for the TLS secret from a 'virsh secret-list'
> +# command and then uncomment the entry
> +#
> +#chardev_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"
> +
> +
> # By default, if no graphical front end is configured, libvirt will disable
> # QEMU audio output since directly talking to alsa/pulseaudio may not work
> # with various security settings. If you know what you're doing, enable
> diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
> index 635fa27..c650961 100644
> --- a/src/qemu/qemu_conf.c
> +++ b/src/qemu/qemu_conf.c
> @@ -365,6 +365,7 @@ static void virQEMUDriverConfigDispose(void *obj)
> VIR_FREE(cfg->nvramDir);
>
> VIR_FREE(cfg->defaultTLSx509certdir);
> + VIR_FREE(cfg->defaultTLSx509secretUUID);
>
> VIR_FREE(cfg->vncTLSx509certdir);
> VIR_FREE(cfg->vncListen);
> @@ -377,6 +378,7 @@ static void virQEMUDriverConfigDispose(void *obj)
> VIR_FREE(cfg->spiceSASLdir);
>
> VIR_FREE(cfg->chardevTLSx509certdir);
> + VIR_FREE(cfg->chardevTLSx509secretUUID);
>
> while (cfg->nhugetlbfs) {
> cfg->nhugetlbfs--;
> @@ -424,6 +426,7 @@ int virQEMUDriverConfigLoadFile(virQEMUDriverConfigPtr cfg,
> int ret = -1;
> int rv;
> size_t i, j;
> + bool defaultTLSx509haveUUID;
> char *stdioHandler = NULL;
> char *user = NULL, *group = NULL;
> char **controllers = NULL;
> @@ -446,6 +449,12 @@ int virQEMUDriverConfigLoadFile(virQEMUDriverConfigPtr cfg,
> goto cleanup;
> if (virConfGetValueBool(conf, "default_tls_x509_verify", &cfg->defaultTLSx509verify) < 0)
> goto cleanup;
> + if ((rv = virConfGetValueString(conf, "default_tls_x509_secret_uuid",
> + &cfg->defaultTLSx509secretUUID)) < 0)
> + goto cleanup;
> + if (rv == 1)
> + defaultTLSx509haveUUID = true;
I don't see any reason to use the extra bool variable. Function
virConfGetValueString() has this logic:
-1 - we error out
0 - string was not found, value is set to NULL
1 - string was found, value is set
IOW you can just use defaultTLSx509secretUUID to detect whether there is
something configured or not. The same applies to chardevTLSx509haveUUID.
> +
> if (virConfGetValueBool(conf, "vnc_auto_unix_socket", &cfg->vncAutoUnixSocket) < 0)
> goto cleanup;
> if (virConfGetValueBool(conf, "vnc_tls", &cfg->vncTLS) < 0)
> @@ -513,6 +522,19 @@ int virQEMUDriverConfigLoadFile(virQEMUDriverConfigPtr cfg,
> goto cleanup;
> if (rv == 0)
> cfg->chardevTLSx509verify = cfg->defaultTLSx509verify;
> + if ((rv = virConfGetValueString(conf, "chardev_tls_x509_secret_uuid",
> + &cfg->chardevTLSx509secretUUID)) < 0)
> + goto cleanup;
> + if (rv == 1) {
> + cfg->chardevTLSx509haveUUID = true;
> + } else {
> + if (defaultTLSx509haveUUID) {
> + if (VIR_STRDUP(cfg->chardevTLSx509secretUUID,
> + cfg->defaultTLSx509secretUUID) < 0)
> + goto cleanup;
> + cfg->chardevTLSx509haveUUID = true;
> + }
Copying the defaultTLSx509secretUUID should be done only in case rv == 0,
otherwise we need to call goto cleanup;
Pavel
> + }
>
> if (virConfGetValueUInt(conf, "remote_websocket_port_min", &cfg->webSocketPortMin) < 0)
> goto cleanup;
> diff --git a/src/qemu/qemu_conf.h b/src/qemu/qemu_conf.h
> index d32689a..a7b01c9 100644
> --- a/src/qemu/qemu_conf.h
> +++ b/src/qemu/qemu_conf.h
> @@ -111,6 +111,7 @@ struct _virQEMUDriverConfig {
>
> char *defaultTLSx509certdir;
> bool defaultTLSx509verify;
> + char *defaultTLSx509secretUUID;
>
> bool vncAutoUnixSocket;
> bool vncTLS;
> @@ -132,6 +133,8 @@ struct _virQEMUDriverConfig {
> bool chardevTLS;
> char *chardevTLSx509certdir;
> bool chardevTLSx509verify;
> + bool chardevTLSx509haveUUID;
> + char *chardevTLSx509secretUUID;
>
> unsigned int remotePortMin;
> unsigned int remotePortMax;
> diff --git a/src/qemu/test_libvirtd_qemu.aug.in b/src/qemu/test_libvirtd_qemu.aug.in
> index cd162ae..805fa0e 100644
> --- a/src/qemu/test_libvirtd_qemu.aug.in
> +++ b/src/qemu/test_libvirtd_qemu.aug.in
> @@ -4,6 +4,7 @@ module Test_libvirtd_qemu =
> test Libvirtd_qemu.lns get conf =
> { "default_tls_x509_cert_dir" = "/etc/pki/qemu" }
> { "default_tls_x509_verify" = "1" }
> +{ "default_tls_x509_secret_uuid" = "00000000-0000-0000-0000-000000000000" }
> { "vnc_listen" = "0.0.0.0" }
> { "vnc_auto_unix_socket" = "1" }
> { "vnc_tls" = "1" }
> @@ -23,6 +24,7 @@ module Test_libvirtd_qemu =
> { "chardev_tls" = "1" }
> { "chardev_tls_x509_cert_dir" = "/etc/pki/libvirt-chardev" }
> { "chardev_tls_x509_verify" = "1" }
> +{ "chardev_tls_x509_secret_uuid" = "00000000-0000-0000-0000-000000000000" }
> { "nographics_allow_host_audio" = "1" }
> { "remote_display_port_min" = "5900" }
> { "remote_display_port_max" = "65535" }
> --
> 2.7.4
>
> --
> libvir-list mailing list
> libvir-list at redhat.com
> https://www.redhat.com/mailman/listinfo/libvir-list
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