Re: [PATCH 2/3] domain: Add optional 'tls' attribute for TCP chardev

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On 10/24/2016 08:41 AM, Pavel Hrdina wrote:
> Add an optional "tls='yes|no'" attribute for a TCP chardev.
> 
> For QEMU, this will allow for disabling the host config setting of the
> 'chardev_tls' for a domain chardev channel by setting the value to "no" or
> to attempt to use a host TLS environment when setting the value to "yes"
> when the host config 'chardev_tls' setting is disabled, but a TLS environment
> is configured via either the host config 'chardev_tls_x509_cert_dir' or
> 'default_tls_x509_cert_dir'
> 
> Alter qemuDomainSupportTLSChardevTCP to augment the decision points for
> choosing whether to try to use TLS.

The above sentence will no longer apply

> 
> Signed-off-by: John Ferlan <jferlan@xxxxxxxxxx>
> Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx>
> ---
>  docs/formatdomain.html.in                          | 28 +++++++++
>  docs/schemas/domaincommon.rng                      |  5 ++
>  src/conf/domain_conf.c                             | 22 +++++++-
>  src/conf/domain_conf.h                             |  1 +
>  src/qemu/qemu_command.c                            |  2 +-
>  src/qemu/qemu_domain.c                             | 66 ++++++++++++++++++++++
>  src/qemu/qemu_domain.h                             |  8 +++
>  src/qemu/qemu_hotplug.c                            | 12 +++-
>  src/qemu/qemu_process.c                            |  2 +
>  ...uxml2argv-serial-tcp-tlsx509-chardev-notls.args | 30 ++++++++++
>  ...muxml2argv-serial-tcp-tlsx509-chardev-notls.xml | 50 ++++++++++++++++
>  tests/qemuxml2argvtest.c                           |  3 +
>  ...xml2xmlout-serial-tcp-tlsx509-chardev-notls.xml |  1 +
>  tests/qemuxml2xmltest.c                            |  1 +
>  14 files changed, 227 insertions(+), 4 deletions(-)
>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.args
>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.xml
>  create mode 120000 tests/qemuxml2xmloutdata/qemuxml2xmlout-serial-tcp-tlsx509-chardev-notls.xml
> 
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index 9051178..0cd68a0 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -6204,6 +6204,34 @@ qemu-kvm -net nic,model=? /dev/null
>    &lt;/devices&gt;
>    ...</pre>
>  
> +    <p>
> +      <span class="since">Since 2.4.0,</span> the optional attribute
> +      <code>tls</code> can be used to control whether a chardev
> +      TCP communication channel would utilize a hypervisor configured
> +      TLS X.509 certificate environment in order to encrypt the data
> +      channel. For the QEMU hypervisor, usage of a TLS environment can
> +      be controlled on the host by the <code>chardev_tls</code> and
> +      <code>chardev_tls_x509_cert_dir</code> or
> +      <code>default_tls_x509_cert_dir</code> settings in the file
> +      /etc/libvirt/qemu.conf. If <code>chardev_tls</code> is enabled,
> +      then unless the <code>tls</code> attribute is set to "no", libvirt
> +      will use the host configured TLS environment.
> +      If <code>chardev_tls</code> is disabled, but the <code>tls</code>
> +      attribute is set to "yes", then libvirt will attempt to use the
> +      host TLS environment if either the <code>chardev_tls_x509_cert_dir</code>
> +      or <code>default_tls_x509_cert_dir</code> TLS directory structure exists.
> +    </p>
> +<pre>
> +  ...
> +  &lt;devices&gt;
> +    &lt;serial type="tcp"&gt;
> +      &lt;source mode='connect' host="127.0.0.1" service="5555" tls="yes"/&gt;
> +      &lt;protocol type="raw"/&gt;
> +      &lt;target port="0"/&gt;
> +    &lt;/serial&gt;
> +  &lt;/devices&gt;
> +  ...</pre>
> +
>      <h6><a name="elementsCharUDP">UDP network console</a></h6>
>  
>      <p>
> diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
> index 3106510..e6741bb 100644
> --- a/docs/schemas/domaincommon.rng
> +++ b/docs/schemas/domaincommon.rng
> @@ -3453,6 +3453,11 @@
>              <ref name="virOnOff"/>
>            </attribute>
>          </optional>
> +        <optional>
> +          <attribute name="tls">
> +            <ref name="virYesNo"/>
> +          </attribute>
> +        </optional>
>          <zeroOrMore>
>            <ref name='devSeclabel'/>
>          </zeroOrMore>
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index 35cdbc3..6e814b3 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -1997,6 +1997,8 @@ virDomainChrSourceDefCopy(virDomainChrSourceDefPtr dest,
>  
>          if (VIR_STRDUP(dest->data.tcp.service, src->data.tcp.service) < 0)
>              return -1;
> +
> +        dest->data.tcp.haveTLS = src->data.tcp.haveTLS;
>          break;
>  
>      case VIR_DOMAIN_CHR_TYPE_UNIX:
> @@ -10039,6 +10041,7 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
>      char *master = NULL;
>      char *slave = NULL;
>      char *append = NULL;
> +    char *haveTLS = NULL;
>      int remaining = 0;
>  
>      while (cur != NULL) {
> @@ -10046,6 +10049,8 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
>              if (xmlStrEqual(cur->name, BAD_CAST "source")) {
>                  if (!mode)
>                      mode = virXMLPropString(cur, "mode");
> +                if (!haveTLS)
> +                    haveTLS = virXMLPropString(cur, "tls");
>  
>                  switch ((virDomainChrType) def->type) {
>                  case VIR_DOMAIN_CHR_TYPE_FILE:
> @@ -10222,6 +10227,15 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
>              def->data.tcp.listen = true;
>          }
>  
> +        if (haveTLS &&
> +            (def->data.tcp.haveTLS =
> +             virTristateBoolTypeFromString(haveTLS)) <= 0) {
> +            virReportError(VIR_ERR_XML_ERROR,
> +                           _("unknown chardev 'tls' setting '%s'"),
> +                           haveTLS);
> +            goto error;
> +        }
> +
>          if (!protocol)
>              def->data.tcp.protocol = VIR_DOMAIN_CHR_TCP_PROTOCOL_RAW;
>          else if ((def->data.tcp.protocol =
> @@ -10306,6 +10320,7 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
>      VIR_FREE(append);
>      VIR_FREE(logappend);
>      VIR_FREE(logfile);
> +    VIR_FREE(haveTLS);
>  
>      return remaining;
>  
> @@ -21492,7 +21507,12 @@ virDomainChrSourceDefFormat(virBufferPtr buf,
>          virBufferAsprintf(buf, "<source mode='%s' ",
>                            def->data.tcp.listen ? "bind" : "connect");
>          virBufferEscapeString(buf, "host='%s' ", def->data.tcp.host);
> -        virBufferEscapeString(buf, "service='%s'/>\n", def->data.tcp.service);
> +        virBufferEscapeString(buf, "service='%s'", def->data.tcp.service);
> +        if (def->data.tcp.haveTLS != VIR_TRISTATE_BOOL_ABSENT)
> +            virBufferAsprintf(buf, " tls='%s'",
> +                    virTristateBoolTypeToString(def->data.tcp.haveTLS));
> +        virBufferAddLit(buf, "/>\n");
> +
>          virBufferAsprintf(buf, "<protocol type='%s'/>\n",
>                            virDomainChrTcpProtocolTypeToString(
>                                def->data.tcp.protocol));
> diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
> index 7fc1141..f1da9c3 100644
> --- a/src/conf/domain_conf.h
> +++ b/src/conf/domain_conf.h
> @@ -1095,6 +1095,7 @@ struct _virDomainChrSourceDef {
>              bool listen;
>              int protocol;
>              bool tlscreds;
> +            int haveTLS; /* enum virTristateBool */
>          } tcp;
>          struct {
>              char *bindHost;
> diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
> index 5713d18..6bf6510 100644
> --- a/src/qemu/qemu_command.c
> +++ b/src/qemu/qemu_command.c
> @@ -4935,7 +4935,7 @@ qemuBuildChrChardevStr(virLogManagerPtr logManager,
>          if (dev->data.tcp.listen)
>              virBufferAdd(&buf, nowait ? ",server,nowait" : ",server", -1);
>  
> -        if (cfg->chardevTLS) {
> +        if (dev->data.tcp.haveTLS == VIR_TRISTATE_BOOL_YES) {
>              char *objalias = NULL;
>  
>              if (qemuBuildTLSx509CommandLine(cmd, cfg->chardevTLSx509certdir,
> diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
> index f11bc01..6cffff0 100644
> --- a/src/qemu/qemu_domain.c
> +++ b/src/qemu/qemu_domain.c
> @@ -6186,6 +6186,72 @@ qemuDomainPrepareChannel(virDomainChrDefPtr channel,
>  }
>  
>  
> +/* qemuProcessPrepareDomainChardevSourceTLS:
> + * @source: pointer to host interface data for char devices
> + * @cfg: driver configuration
> + *
> + * Updates host interface TLS encryption setting based on qemu.conf
> + * for char devices.  This will be presented as "tls='yes|no'" in
> + * live XML of a guest.
> + */
> +void
> +qemuDomainPrepareChardevSourceTLS(virDomainChrSourceDefPtr source,
> +                                  virQEMUDriverConfigPtr cfg)
> +{
> +    if (source->type == VIR_DOMAIN_CHR_TYPE_TCP) {
> +        if (source->data.tcp.haveTLS == VIR_TRISTATE_BOOL_ABSENT) {
> +            if (cfg->chardevTLS)
> +                source->data.tcp.haveTLS = VIR_TRISTATE_BOOL_YES;
> +            else
> +                source->data.tcp.haveTLS = VIR_TRISTATE_BOOL_NO;
> +        }
> +    }
> +}
> +
> +
> +/* qemuProcessPrepareDomainChardevSource:
> + * @def: live domain definition
> + * @driver: qemu driver
> + *
> + * Iterate through all devices that use virDomainChrSourceDefPtr as host
> + * interface part.
> + */
> +void
> +qemuDomainPrepareChardevSource(virDomainDefPtr def,
> +                               virQEMUDriverPtr driver)
> +{
> +    size_t i;
> +    virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
> +
> +    for (i = 0; i < def->nserials; i++)
> +        qemuDomainPrepareChardevSourceTLS(def->serials[i]->source, cfg);
> +
> +    for (i = 0; i < def->nparallels; i++)
> +        qemuDomainPrepareChardevSourceTLS(def->parallels[i]->source, cfg);
> +
> +    for (i = 0; i < def->nchannels; i++)
> +        qemuDomainPrepareChardevSourceTLS(def->channels[i]->source, cfg);
> +
> +    for (i = 0; i < def->nconsoles; i++)
> +        qemuDomainPrepareChardevSourceTLS(def->consoles[i]->source, cfg);

I suppose these work, but in a way do open code the
virDomainChrDefForeach...   IDC either way

ACK w/ the commit message adjusted

> +
> +    for (i = 0; i < def->nrngs; i++)
> +        if (def->rngs[i]->backend == VIR_DOMAIN_RNG_BACKEND_EGD)
> +            qemuDomainPrepareChardevSourceTLS(def->rngs[i]->source.chardev, cfg);
> +
> +    for (i = 0; i < def->nsmartcards; i++)
> +        if (def->smartcards[i]->type == VIR_DOMAIN_SMARTCARD_TYPE_PASSTHROUGH)
> +            qemuDomainPrepareChardevSourceTLS(def->smartcards[i]->data.passthru,
> +                                              cfg);
> +
> +    for (i = 0; i < def->nredirdevs; i++)
> +        qemuDomainPrepareChardevSourceTLS(def->redirdevs[i]->source, cfg);
> +
> +    virObjectUnref(cfg);
> +}
> +
> +
> +
>  int
>  qemuDomainPrepareShmemChardev(virDomainShmemDefPtr shmem)
>  {
> diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
> index 29125a2..4f9bf82 100644
> --- a/src/qemu/qemu_domain.h
> +++ b/src/qemu/qemu_domain.h
> @@ -739,6 +739,14 @@ int qemuDomainPrepareChannel(virDomainChrDefPtr chr,
>                               const char *domainChannelTargetDir)
>      ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
>  
> +void qemuDomainPrepareChardevSourceTLS(virDomainChrSourceDefPtr source,
> +                                       virQEMUDriverConfigPtr cfg)
> +    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
> +
> +void qemuDomainPrepareChardevSource(virDomainDefPtr def,
> +                                    virQEMUDriverPtr driver)
> +    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
> +
>  int qemuDomainPrepareShmemChardev(virDomainShmemDefPtr shmem)
>      ATTRIBUTE_NONNULL(1);
>  
> diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
> index 706b736..cf69945 100644
> --- a/src/qemu/qemu_hotplug.c
> +++ b/src/qemu/qemu_hotplug.c
> @@ -1482,7 +1482,8 @@ qemuDomainGetChardevTLSObjects(virQEMUDriverConfigPtr cfg,
>                                 virJSONValuePtr *tlsProps,
>                                 char **tlsAlias)
>  {
> -    if (dev->type != VIR_DOMAIN_CHR_TYPE_TCP || !cfg->chardevTLS)
> +    if (dev->type != VIR_DOMAIN_CHR_TYPE_TCP ||
> +        dev->data.tcp.haveTLS != VIR_TRISTATE_BOOL_YES)
>          return 0;
>  
>      if (qemuBuildTLSx509BackendProps(cfg->chardevTLSx509certdir,
> @@ -1517,6 +1518,8 @@ int qemuDomainAttachRedirdevDevice(virQEMUDriverPtr driver,
>      char *tlsAlias = NULL;
>      virErrorPtr orig_err;
>  
> +    qemuDomainPrepareChardevSourceTLS(redirdev->source, cfg);
> +
>      if (qemuAssignDeviceRedirdevAlias(def, redirdev, -1) < 0)
>          goto cleanup;
>  
> @@ -1771,6 +1774,8 @@ int qemuDomainAttachChrDevice(virQEMUDriverPtr driver,
>          qemuDomainPrepareChannel(chr, priv->channelTargetDir) < 0)
>          goto cleanup;
>  
> +    qemuDomainPrepareChardevSourceTLS(dev, cfg);
> +
>      if (qemuAssignDeviceChrAlias(vmdef, chr, -1) < 0)
>          goto cleanup;
>  
> @@ -1901,6 +1906,9 @@ qemuDomainAttachRNGDevice(virQEMUDriverPtr driver,
>              goto cleanup;
>      }
>  
> +    if (rng->backend == VIR_DOMAIN_RNG_BACKEND_EGD)
> +        qemuDomainPrepareChardevSourceTLS(rng->source.chardev, cfg);
> +
>      /* build required metadata */
>      if (!(devstr = qemuBuildRNGDevStr(vm->def, rng, priv->qemuCaps)))
>          goto cleanup;
> @@ -4476,7 +4484,7 @@ int qemuDomainDetachChrDevice(virQEMUDriverPtr driver,
>          goto cleanup;
>  
>      if (tmpChr->source->type == VIR_DOMAIN_CHR_TYPE_TCP &&
> -        cfg->chardevTLS &&
> +        tmpChr->source->data.tcp.haveTLS == VIR_TRISTATE_BOOL_YES &&
>          !(objAlias = qemuAliasTLSObjFromChardevAlias(charAlias)))
>          goto cleanup;
>  
> diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
> index a1e2896..33b78b1 100644
> --- a/src/qemu/qemu_process.c
> +++ b/src/qemu/qemu_process.c
> @@ -5167,6 +5167,8 @@ qemuProcessPrepareDomain(virConnectPtr conn,
>              goto cleanup;
>      }
>  
> +    qemuDomainPrepareChardevSource(vm->def, driver);
> +
>      if (VIR_ALLOC(priv->monConfig) < 0)
>          goto cleanup;
>  
> diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.args b/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.args
> new file mode 100644
> index 0000000..cac0d85
> --- /dev/null
> +++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.args
> @@ -0,0 +1,30 @@
> +LC_ALL=C \
> +PATH=/bin \
> +HOME=/home/test \
> +USER=test \
> +LOGNAME=test \
> +QEMU_AUDIO_DRV=none \
> +/usr/bin/qemu \
> +-name QEMUGuest1 \
> +-S \
> +-M pc \
> +-m 214 \
> +-smp 1,sockets=1,cores=1,threads=1 \
> +-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
> +-nographic \
> +-nodefconfig \
> +-nodefaults \
> +-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
> +server,nowait \
> +-mon chardev=charmonitor,id=monitor,mode=readline \
> +-no-acpi \
> +-boot c \
> +-usb \
> +-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
> +-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
> +-chardev udp,id=charserial0,host=127.0.0.1,port=2222,localaddr=127.0.0.1,\
> +localport=1111 \
> +-device isa-serial,chardev=charserial0,id=serial0 \
> +-chardev socket,id=charserial1,host=127.0.0.1,port=5555 \
> +-device isa-serial,chardev=charserial1,id=serial1 \
> +-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
> diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.xml
> new file mode 100644
> index 0000000..debc69b
> --- /dev/null
> +++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.xml
> @@ -0,0 +1,50 @@
> +<domain type='qemu'>
> +  <name>QEMUGuest1</name>
> +  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
> +  <memory unit='KiB'>219136</memory>
> +  <currentMemory unit='KiB'>219136</currentMemory>
> +  <vcpu placement='static'>1</vcpu>
> +  <os>
> +    <type arch='i686' machine='pc'>hvm</type>
> +    <boot dev='hd'/>
> +  </os>
> +  <clock offset='utc'/>
> +  <on_poweroff>destroy</on_poweroff>
> +  <on_reboot>restart</on_reboot>
> +  <on_crash>destroy</on_crash>
> +  <devices>
> +    <emulator>/usr/bin/qemu</emulator>
> +    <disk type='block' device='disk'>
> +      <source dev='/dev/HostVG/QEMUGuest1'/>
> +      <target dev='hda' bus='ide'/>
> +      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> +    </disk>
> +    <controller type='usb' index='0'>
> +      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
> +    </controller>
> +    <controller type='ide' index='0'>
> +      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
> +    </controller>
> +    <controller type='pci' index='0' model='pci-root'/>
> +    <serial type='udp'>
> +      <source mode='bind' host='127.0.0.1' service='1111'/>
> +      <source mode='connect' host='127.0.0.1' service='2222'/>
> +      <target port='0'/>
> +    </serial>
> +    <serial type='tcp'>
> +      <source mode='connect' host='127.0.0.1' service='5555' tls='no'/>
> +      <protocol type='raw'/>
> +      <target port='0'/>
> +    </serial>
> +    <console type='udp'>
> +      <source mode='bind' host='127.0.0.1' service='1111'/>
> +      <source mode='connect' host='127.0.0.1' service='2222'/>
> +      <target type='serial' port='0'/>
> +    </console>
> +    <input type='mouse' bus='ps2'/>
> +    <input type='keyboard' bus='ps2'/>
> +    <memballoon model='virtio'>
> +      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
> +    </memballoon>
> +  </devices>
> +</domain>
> diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
> index 3e9f825..52d85fa 100644
> --- a/tests/qemuxml2argvtest.c
> +++ b/tests/qemuxml2argvtest.c
> @@ -1167,6 +1167,9 @@ mymain(void)
>              QEMU_CAPS_CHARDEV, QEMU_CAPS_NODEFCONFIG,
>              QEMU_CAPS_OBJECT_TLS_CREDS_X509);
>      driver.config->chardevTLSx509verify = 0;
> +    DO_TEST("serial-tcp-tlsx509-chardev-notls",
> +            QEMU_CAPS_CHARDEV, QEMU_CAPS_NODEFCONFIG,
> +            QEMU_CAPS_OBJECT_TLS_CREDS_X509);
>      driver.config->chardevTLS = 0;
>      VIR_FREE(driver.config->chardevTLSx509certdir);
>      DO_TEST("serial-many-chardev",
> diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-serial-tcp-tlsx509-chardev-notls.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-serial-tcp-tlsx509-chardev-notls.xml
> new file mode 120000
> index 0000000..26484c9
> --- /dev/null
> +++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-serial-tcp-tlsx509-chardev-notls.xml
> @@ -0,0 +1 @@
> +../qemuxml2argvdata/qemuxml2argv-serial-tcp-tlsx509-chardev-notls.xml
> \ No newline at end of file
> diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
> index 95c0bf2..64da80a 100644
> --- a/tests/qemuxml2xmltest.c
> +++ b/tests/qemuxml2xmltest.c
> @@ -534,6 +534,7 @@ mymain(void)
>      DO_TEST("serial-udp", NONE);
>      DO_TEST("serial-tcp-telnet", NONE);
>      DO_TEST("serial-tcp-tlsx509-chardev", NONE);
> +    DO_TEST("serial-tcp-tlsx509-chardev-notls", NONE);
>      DO_TEST("serial-many", NONE);
>      DO_TEST("serial-spiceport", NONE);
>      DO_TEST("serial-spiceport-nospice", NONE);
> 

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