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[libvirt] [PATCH 2/4] security, apparmor: add (Set|Restore)InputLabel

Christian Ehrhardt posted 4 patches 7 years, 3 months ago
There is a newer version of this series
[libvirt] [PATCH 2/4] security, apparmor: add (Set|Restore)InputLabel
Posted by Christian Ehrhardt 7 years, 3 months ago 
d8116b5a "security: Introduce functions for input device hot(un)plug"
implemented the code (Set|Restore)InputLabel for several security modules,
this patch adds an AppArmor implementation for it as well.

That fixes hot-plugging event input devices by generating a rule for the
path that needs to be accessed.

Example hot adding:
  <input type='passthrough' bus='virtio'>
     <source evdev='/dev/input/event0' />
  </input>
Creates now:
  "/dev/input/event0" rwk,

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
---
 src/security/security_apparmor.c | 51 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/src/security/security_apparmor.c b/src/security/security_apparmor.c
index 4ae1e3d..7924b9a 100644
--- a/src/security/security_apparmor.c
+++ b/src/security/security_apparmor.c
@@ -765,6 +765,54 @@ AppArmorRestoreMemoryLabel(virSecurityManagerPtr mgr,
 
 /* Called when hotplugging */
 static int
+AppArmorSetInputLabel(virSecurityManagerPtr mgr,
+                      virDomainDefPtr def,
+                      virDomainInputDefPtr input)
+{
+    virSecurityLabelDefPtr secdef;
+
+    secdef = virDomainDefGetSecurityLabelDef(def, SECURITY_APPARMOR_NAME);
+    if (!secdef || !secdef->relabel)
+        return 0;
+
+    switch ((virDomainInputType) input->type) {
+    case VIR_DOMAIN_INPUT_TYPE_PASSTHROUGH:
+        if (!virFileExists(input->source.evdev)) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("%s: \'%s\' does not exist"),
+                           __func__, input->source.evdev);
+            return -1;
+        }
+        return reload_profile(mgr, def, input->source.evdev, true);
+        break;
+
+    case VIR_DOMAIN_INPUT_TYPE_MOUSE:
+    case VIR_DOMAIN_INPUT_TYPE_TABLET:
+    case VIR_DOMAIN_INPUT_TYPE_KBD:
+    case VIR_DOMAIN_INPUT_TYPE_LAST:
+        break;
+    }
+
+    return 0;
+}
+
+
+static int
+AppArmorRestoreInputLabel(virSecurityManagerPtr mgr,
+                          virDomainDefPtr def,
+                          virDomainInputDefPtr input ATTRIBUTE_UNUSED)
+{
+    virSecurityLabelDefPtr secdef =
+        virDomainDefGetSecurityLabelDef(def, SECURITY_APPARMOR_NAME);
+
+    if (!secdef || !secdef->relabel)
+        return 0;
+
+    return reload_profile(mgr, def, NULL, false);
+}
+
+/* Called when hotplugging */
+static int
 AppArmorSetSecurityImageLabel(virSecurityManagerPtr mgr,
                               virDomainDefPtr def,
                               virStorageSourcePtr src)
@@ -1165,6 +1213,9 @@ virSecurityDriver virAppArmorSecurityDriver = {
     .domainSetSecurityMemoryLabel       = AppArmorSetMemoryLabel,
     .domainRestoreSecurityMemoryLabel   = AppArmorRestoreMemoryLabel,
 
+    .domainSetSecurityInputLabel        = AppArmorSetInputLabel,
+    .domainRestoreSecurityInputLabel    = AppArmorRestoreInputLabel,
+
     .domainSetSecurityDaemonSocketLabel = AppArmorSetSecurityDaemonSocketLabel,
     .domainSetSecuritySocketLabel       = AppArmorSetSecuritySocketLabel,
     .domainClearSecuritySocketLabel     = AppArmorClearSecuritySocketLabel,
-- 
2.7.4

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Re: [libvirt] [PATCH 2/4] security, apparmor: add (Set|Restore)InputLabel
Posted by Jamie Strandboge 7 years, 3 months ago 
On Tue, 2018-03-20 at 13:08 +0100, Christian Ehrhardt wrote:
> d8116b5a "security: Introduce functions for input device hot(un)plug"
> implemented the code (Set|Restore)InputLabel for several security
> modules,
> this patch adds an AppArmor implementation for it as well.
> 
> That fixes hot-plugging event input devices by generating a rule for
> the
> path that needs to be accessed.
> 
> Example hot adding:
>   <input type='passthrough' bus='virtio'>
>      <source evdev='/dev/input/event0' />
>   </input>
> Creates now:
>   "/dev/input/event0" rwk,
> 
> Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
> ---
>  src/security/security_apparmor.c | 51
> ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 51 insertions(+)
> 
> diff --git a/src/security/security_apparmor.c
> b/src/security/security_apparmor.c
> index 4ae1e3d..7924b9a 100644
> --- a/src/security/security_apparmor.c
> +++ b/src/security/security_apparmor.c
> @@ -765,6 +765,54 @@ AppArmorRestoreMemoryLabel(virSecurityManagerPtr
> mgr,
>  
>  /* Called when hotplugging */
>  static int
> +AppArmorSetInputLabel(virSecurityManagerPtr mgr,
> +                      virDomainDefPtr def,
> +                      virDomainInputDefPtr input)
> +{
> +    virSecurityLabelDefPtr secdef;
> +
> +    secdef = virDomainDefGetSecurityLabelDef(def,
> SECURITY_APPARMOR_NAME);
> +    if (!secdef || !secdef->relabel)
> +        return 0;
> +
> +    switch ((virDomainInputType) input->type) {
> +    case VIR_DOMAIN_INPUT_TYPE_PASSTHROUGH:
> +        if (!virFileExists(input->source.evdev)) {
> +            virReportError(VIR_ERR_INTERNAL_ERROR,
> +                           _("%s: \'%s\' does not exist"),
> +                           __func__, input->source.evdev);
> +            return -1;
> +        }
> +        return reload_profile(mgr, def, input->source.evdev, true);
> +        break;
> +
> +    case VIR_DOMAIN_INPUT_TYPE_MOUSE:
> +    case VIR_DOMAIN_INPUT_TYPE_TABLET:
> +    case VIR_DOMAIN_INPUT_TYPE_KBD:
> +    case VIR_DOMAIN_INPUT_TYPE_LAST:
> +        break;
> +    }
> +
> +    return 0;
> +}
> +
> +
> +static int
> +AppArmorRestoreInputLabel(virSecurityManagerPtr mgr,
> +                          virDomainDefPtr def,
> +                          virDomainInputDefPtr input
> ATTRIBUTE_UNUSED)
> +{
> +    virSecurityLabelDefPtr secdef =
> +        virDomainDefGetSecurityLabelDef(def,
> SECURITY_APPARMOR_NAME);
> +
> +    if (!secdef || !secdef->relabel)
> +        return 0;
> +
> +    return reload_profile(mgr, def, NULL, false);
> +}
> +
> +/* Called when hotplugging */
> +static int
>  AppArmorSetSecurityImageLabel(virSecurityManagerPtr mgr,
>                                virDomainDefPtr def,
>                                virStorageSourcePtr src)
> @@ -1165,6 +1213,9 @@ virSecurityDriver virAppArmorSecurityDriver = {
>      .domainSetSecurityMemoryLabel       = AppArmorSetMemoryLabel,
>      .domainRestoreSecurityMemoryLabel   =
> AppArmorRestoreMemoryLabel,
>  
> +    .domainSetSecurityInputLabel        = AppArmorSetInputLabel,
> +    .domainRestoreSecurityInputLabel    = AppArmorRestoreInputLabel,
> +
>      .domainSetSecurityDaemonSocketLabel =
> AppArmorSetSecurityDaemonSocketLabel,
>      .domainSetSecuritySocketLabel       =
> AppArmorSetSecuritySocketLabel,
>      .domainClearSecuritySocketLabel     =
> AppArmorClearSecuritySocketLabel,

Same comments on this as for '[PATCH 1/4] security, apparmor: add
(Set|Restore)MemoryLabel'.

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