qemu: Fix access to auto-generated socket paths

We are automatically generating some socket paths for domains, but all
those paths end up in a directory that's the same for multiple domains.
The problem is that multiple domains can each run with different
seclabels (users, selinux contexts, etc.).  The idea here is to create a
per-domain directory labelled in a way that each domain can access its
own unix sockets.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1146886

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>

src/qemu/qemu_command.c

@@ -8051,7 +8051,7 @@ qemuBuildGraphicsVNCCommandLine(virQEMUDriverConfigPtr cfg,
     if (graphics->data.vnc.socket || cfg->vncAutoUnixSocket) {
         if (!graphics->data.vnc.socket &&
             virAsprintf(&graphics->data.vnc.socket,
-                        "%s/%s.vnc", cfg->libDir, def->name) == -1)
+                        "%s/domain-%s/vnc.sock", cfg->libDir, def->name) == -1)
             goto error;
 
         virBufferAsprintf(&opt, "unix:%s", graphics->data.vnc.socket);

src/qemu/qemu_domain.c

@@ -1307,16 +1307,12 @@ qemuDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
             goto cleanup;
         }
 
-        if (dev->data.chr->target.name) {
-            if (virAsprintf(&dev->data.chr->source.data.nix.path, "%s/%s.%s",
-                            cfg->channelTargetDir,
-                            def->name, dev->data.chr->target.name) < 0)
-                goto cleanup;
-        } else {
-            if (virAsprintf(&dev->data.chr->source.data.nix.path, "%s/%s",
-                            cfg->channelTargetDir, def->name) < 0)
-                goto cleanup;
-        }
+        if (virAsprintf(&dev->data.chr->source.data.nix.path,
+                        "%s/domain-%s/%s",
+                        cfg->channelTargetDir, def->name,
+                        dev->data.chr->target.name ? dev->data.chr->target.name
+                        : "unknown.sock") < 0)
+            goto cleanup;
 
         dev->data.chr->source.data.nix.listen = true;
     }

src/qemu/qemu_process.c

@@ -46,6 +46,7 @@
 
 #include "cpu/cpu.h"
 #include "datatypes.h"
+#include "dirname.h"
 #include "virlog.h"
 #include "virerror.h"
 #include "viralloc.h"
@@ -3265,7 +3266,7 @@ qemuProcessPrepareMonitorChr(virQEMUDriverConfigPtr cfg,
     monConfig->type = VIR_DOMAIN_CHR_TYPE_UNIX;
     monConfig->data.nix.listen = true;
 
-    if (virAsprintf(&monConfig->data.nix.path, "%s/%s.monitor",
+    if (virAsprintf(&monConfig->data.nix.path, "%s/domain-%s/monitor.sock",
                     cfg->libDir, vm) < 0)
         return -1;
     return 0;
@@ -4389,6 +4390,7 @@ int qemuProcessStart(virConnectPtr conn,
     unsigned int hostdev_flags = 0;
     size_t nnicindexes = 0;
     int *nicindexes = NULL;
+    char *tmppath = NULL, *tmpdirpath = NULL;
 
     VIR_DEBUG("vm=%p name=%s id=%d asyncJob=%d migrateFrom=%s stdin_fd=%d "
               "stdin_path=%s snapshot=%p vmop=%d flags=0x%x",
@@ -4725,6 +4727,44 @@ int qemuProcessStart(virConnectPtr conn,
                                      &nnicindexes, &nicindexes)))
         goto cleanup;
 
+
+    /*
+     * Create all per-domain directories in order to make sure domain
+     * with any possible seclabels can access it.
+     */
+    if (virAsprintf(&tmppath, "%s/domain-%s", cfg->libDir, vm->def->name) < 0)
+        goto cleanup;
+
+    if (virFileMakePath(tmppath) < 0)
+        goto cleanup;
+
+    if (!(tmpdirpath = mdir_name(tmppath)))
+        goto cleanup;
+
+    if (virSecurityManagerDomainSetDirLabel(driver->securityManager,
+                                            vm->def, tmpdirpath) < 0)
+        goto cleanup;
+
+    VIR_FREE(tmppath);
+    VIR_FREE(tmpdirpath);
+
+    if (virAsprintf(&tmppath, "%s/domain-%s",
+                    cfg->channelTargetDir, vm->def->name) < 0)
+        goto cleanup;
+
+    if (virFileMakePath(tmppath) < 0)
+        goto cleanup;
+
+    if (!(tmpdirpath = mdir_name(tmppath)))
+        goto cleanup;
+
+    if (virSecurityManagerDomainSetDirLabel(driver->securityManager,
+                                            vm->def, tmpdirpath) < 0)
+        goto cleanup;
+
+    VIR_FREE(tmpdirpath);
+    VIR_FREE(tmppath);
+
     /* now that we know it is about to start call the hook if present */
     if (virHookPresent(VIR_HOOK_DRIVER_QEMU)) {
         char *xml = qemuDomainDefFormatXML(driver, vm->def, 0);
@@ -5078,6 +5118,8 @@ int qemuProcessStart(virConnectPtr conn,
     /* We jump here if we failed to start the VM for any reason, or
      * if we failed to initialize the now running VM. kill it off and
      * pretend we never started it */
+    VIR_FREE(tmppath);
+    VIR_FREE(tmpdirpath);
     VIR_FREE(nodeset);
     virCommandFree(cmd);
     VIR_FORCE_CLOSE(logfile);
@@ -5140,6 +5182,7 @@ void qemuProcessStop(virQEMUDriverPtr driver,
     size_t i;
     int logfile = -1;
     char *timestamp;
+    char *tmppath = NULL;
     char ebuf[1024];
     virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
 
@@ -5230,6 +5273,18 @@ void qemuProcessStop(virQEMUDriverPtr driver,
         priv->monConfig = NULL;
     }
 
+    ignore_value(virAsprintf(&tmppath, "%s/domain-%s",
+                             cfg->libDir, vm->def->name));
+    if (tmppath)
+        virFileDeleteTree(tmppath);
+    VIR_FREE(tmppath);
+
+    ignore_value(virAsprintf(&tmppath, "%s/domain-%s",
+                             cfg->channelTargetDir, vm->def->name));
+    if (tmppath)
+        virFileDeleteTree(tmppath);
+    VIR_FREE(tmppath);
+
     ignore_value(virDomainChrDefForeach(vm->def,
                                         false,
                                         qemuProcessCleanupChardevDevice,

tests/qemuxml2argvdata/qemuxml2argv-channel-virtio-unix.args

@@ -9,11 +9,12 @@ LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
 -usb \
 -hda /dev/HostVG/QEMUGuest1 \
 -chardev socket,id=charchannel0,path=\
-/tmp/QEMUGuest1.org.qemu.guest_agent.0,server,nowait \
+/tmp/domain-QEMUGuest1/org.qemu.guest_agent.0,server,nowait \
 -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,\
 name=org.qemu.guest_agent.0 \
--chardev socket,id=charchannel1,path=/tmp/QEMUGuest1,server,nowait \
+-chardev \
+socket,id=charchannel1,path=/tmp/domain-QEMUGuest1/unknown.sock,server,nowait \
 -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1 \
--chardev socket,id=charchannel2,path=/tmp/QEMUGuest1.ble,server,nowait \
+-chardev socket,id=charchannel2,path=/tmp/domain-QEMUGuest1/ble,server,nowait \
 -device virtserialport,bus=virtio-serial0.0,nr=3,chardev=charchannel2,id=channel2,\
 name=ble