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[libvirt] [PATCH] Add info about access control checks into API reference



From: "Daniel P. Berrange" <berrange redhat com>

So that app developers / admins know what access control checks
are performed for each API, this patch extends the API docs
generator to include details of the ACLs for each.

The gendispatch.pl script is extended so that it generates
a simple XML describing ACL rules, eg.

  <aclinfo>
    ...
    <api name='virConnectNumOfDomains'>
      <check object='connect' perm='search_domains'/>
      <filter object='domain' perm='getattr'/>
    </api>
    <api name='virDomainAttachDeviceFlags'>
      <check object='domain' perm='write'/>
      <check object='domain' perm='save' flags='!VIR_DOMAIN_AFFECT_CONFIG|VIR_DOMAIN_AFFECT_LIVE'/>
      <check object='domain' perm='save' flags='VIR_DOMAIN_AFFECT_CONFIG'/>
    </api>
    ...
  </aclinfo>

The newapi.xsl template loads the XML files containing the ACL
rules and generates a short block of HTML for each API describing
the parameter checks and return value filters (if any).

Signed-off-by: Daniel P. Berrange <berrange redhat com>
---
 docs/libvirt.css       | 14 +++++++++++
 docs/newapi.xsl        | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++
 src/Makefile.am        | 22 ++++++++++++++--
 src/rpc/gendispatch.pl | 59 ++++++++++++++++++++++++++++++++++++++++---
 4 files changed, 157 insertions(+), 6 deletions(-)

diff --git a/docs/libvirt.css b/docs/libvirt.css
index 8a00d12..ed67b2f 100644
--- a/docs/libvirt.css
+++ b/docs/libvirt.css
@@ -477,3 +477,17 @@ dl.variablelist > dt {
 dl.variablelist > dt:after {
     content: ": ";
 }
+
+table.acl {
+    margin: 1em;
+    border-spacing: 0px;
+    border: 1px solid #ccc;
+}
+
+table.acl tr, table.acl td {
+    padding: 0.3em;
+}
+
+table.acl thead {
+    background: #ddd;
+}
diff --git a/docs/newapi.xsl b/docs/newapi.xsl
index d5b210e..58f12eb 100644
--- a/docs/newapi.xsl
+++ b/docs/newapi.xsl
@@ -29,6 +29,69 @@
   <xsl:variable name="htmldir">html</xsl:variable>
   <xsl:variable name="href_base">../</xsl:variable>
 
+  <xsl:variable name="acls">
+    <xsl:copy-of select="document('../src/libvirt_access.xml')/aclinfo/api"/>
+  </xsl:variable>
+  <xsl:variable name="qemuacls">
+    <xsl:copy-of select="document('../src/libvirt_access_qemu.xml')/aclinfo/api"/>
+  </xsl:variable>
+  <xsl:variable name="lxcacls">
+    <xsl:copy-of select="document('../src/libvirt_access_lxc.xml')/aclinfo/api"/>
+  </xsl:variable>
+
+  <xsl:template name="aclinfo">
+    <xsl:param name="api"/>
+
+    <xsl:if test="count(exsl:node-set($acls)/api[ name=$api]/check) > 0">
+      <h5>Access control parameter checks</h5>
+      <table class="acl">
+        <thead>
+          <tr>
+            <th>Object</th>
+            <th>Permission</th>
+            <th>Condition</th>
+          </tr>
+        </thead>
+        <xsl:apply-templates select="exsl:node-set($acls)/api[ name=$api]/check" mode="acl"/>
+      </table>
+    </xsl:if>
+    <xsl:if test="count(exsl:node-set($acls)/api[ name=$api]/filter) > 0">
+      <h5>Access control return value filters</h5>
+      <table class="acl">
+        <thead>
+          <tr>
+            <th>Object</th>
+            <th>Permission</th>
+          </tr>
+        </thead>
+        <xsl:apply-templates select="exsl:node-set($acls)/api[ name=$api]/filter" mode="acl"/>
+      </table>
+    </xsl:if>
+  </xsl:template>
+
+  <xsl:template match="check" mode="acl">
+    <tr>
+      <td><xsl:value-of select="@object"/></td>
+      <td><xsl:value-of select="@perm"/></td>
+      <xsl:choose>
+        <xsl:when test="@flags">
+          <td><xsl:value-of select="@flags"/></td>
+        </xsl:when>
+        <xsl:otherwise>
+          <td>-</td>
+        </xsl:otherwise>
+      </xsl:choose>
+    </tr>
+  </xsl:template>
+
+  <xsl:template match="filter" mode="acl">
+    <tr>
+      <td><xsl:value-of select="@object"/></td>
+      <td><xsl:value-of select="@perm"/></td>
+    </tr>
+  </xsl:template>
+
+
   <xsl:template name="navbar">
     <xsl:variable name="previous" select="preceding-sibling::file[1]"/>
     <xsl:variable name="next" select="following-sibling::file[1]"/>
@@ -553,6 +616,11 @@
         </xsl:if>
       </dl>
     </xsl:if>
+    <div class="acl">
+      <xsl:call-template name="aclinfo">
+        <xsl:with-param name="api" select="$name"/>
+      </xsl:call-template>
+    </div>
   </xsl:template>
 
   <xsl:template match="exports" mode="toc">
diff --git a/src/Makefile.am b/src/Makefile.am
index ac66ecf..277f749 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -830,6 +830,11 @@ ACCESS_DRIVER_SYM_FILES = \
 		libvirt_access_qemu.syms \
 		libvirt_access_lxc.syms
 
+ACCESS_DRIVER_API_FILES = \
+		libvirt_access.xml \
+		libvirt_access_qemu.xml \
+		libvirt_access_lxc.xml
+
 ACCESS_DRIVER_SOURCES = \
 		access/viraccessperm.h access/viraccessperm.c \
 		access/viraccessmanager.h access/viraccessmanager.c \
@@ -1496,8 +1501,8 @@ EXTRA_DIST += $(ACCESS_DRIVER_POLKIT_SOURCES)
 endif
 
 
-BUILT_SOURCES += $(ACCESS_DRIVER_GENERATED)
-CLEANFILES += $(ACCESS_DRIVER_GENERATED)
+BUILT_SOURCES += $(ACCESS_DRIVER_GENERATED) $(ACCESS_DRIVER_API_FILES)
+CLEANFILES += $(ACCESS_DRIVER_GENERATED) $(ACCESS_DRIVER_API_FILES)
 
 libvirt_access.syms: $(srcdir)/rpc/gendispatch.pl \
 			$(REMOTE_PROTOCOL) Makefile.am
@@ -1512,6 +1517,19 @@ libvirt_access_lxc.syms: $(srcdir)/rpc/gendispatch.pl \
 	$(AM_V_GEN)$(PERL) -w $(srcdir)/rpc/gendispatch.pl --mode=aclsym \
 	  lxc LXC $(LXC_PROTOCOL) > $@
 
+libvirt_access.xml: $(srcdir)/rpc/gendispatch.pl \
+			$(REMOTE_PROTOCOL) Makefile.am
+	$(AM_V_GEN)$(PERL) -w $(srcdir)/rpc/gendispatch.pl --mode=aclapi \
+	  remote REMOTE $(REMOTE_PROTOCOL) > $@
+libvirt_access_qemu.xml: $(srcdir)/rpc/gendispatch.pl \
+			$(QEMU_PROTOCOL) Makefile.am
+	$(AM_V_GEN)$(PERL) -w $(srcdir)/rpc/gendispatch.pl --mode=aclapi \
+	  qemu QEMU $(QEMU_PROTOCOL) > $@
+libvirt_access_lxc.xml: $(srcdir)/rpc/gendispatch.pl \
+			$(LXC_PROTOCOL) Makefile.am
+	$(AM_V_GEN)$(PERL) -w $(srcdir)/rpc/gendispatch.pl --mode=aclapi \
+	  lxc LXC $(LXC_PROTOCOL) > $@
+
 $(srcdir)/access/viraccessapicheck.h: $(srcdir)/rpc/gendispatch.pl \
 			$(REMOTE_PROTOCOL) Makefile.am
 	$(AM_V_GEN)$(PERL) -w $(srcdir)/rpc/gendispatch.pl --mode=aclheader \
diff --git a/src/rpc/gendispatch.pl b/src/rpc/gendispatch.pl
index 8f41771..ac0c7ab 100755
--- a/src/rpc/gendispatch.pl
+++ b/src/rpc/gendispatch.pl
@@ -41,8 +41,8 @@ my $res = GetOptions("mode=s" => \$mode);
 die "cannot parse command line options" unless $res;
 
 die "unknown mode '$mode', expecting 'client', 'server', " .
-    "'aclheader', 'aclbody', 'aclsym' or 'debug'"
-    unless $mode =~ /^(client|server|aclheader|aclbody|aclsym|debug)$/;
+    "'aclheader', 'aclbody', 'aclsym', 'aclapi' or 'debug'"
+    unless $mode =~ /^(client|server|aclheader|aclbody|aclsym|aclapi|debug)$/;
 
 my $structprefix = shift or die "missing struct prefix argument";
 my $procprefix = shift or die "missing procedure prefix argument";
@@ -351,6 +351,13 @@ if ($mode eq "aclsym") {
 # Automatically generated by gendispatch.pl.
 # Do not edit this file.  Any changes you make will be lost.
 __EOF__
+} elsif ($mode eq "aclapi") {
+    print <<__EOF__;
+<!--
+  -  Automatically generated by gendispatch.pl.
+  -  Do not edit this file.  Any changes you make will be lost.
+  -->
+__EOF__
 } else {
     print <<__EOF__;
 /* Automatically generated by gendispatch.pl.
@@ -1641,7 +1648,8 @@ elsif ($mode eq "client") {
     }
 } elsif ($mode eq "aclheader" ||
          $mode eq "aclbody" ||
-         $mode eq "aclsym") {
+         $mode eq "aclsym" ||
+         $mode eq "aclapi") {
     my %generate = map { $_ => 1 } @autogen;
     my @keys = keys %calls;
 
@@ -1667,6 +1675,7 @@ elsif ($mode eq "client") {
         foreach my $hdr (@headers) {
             print "#include \"$hdr\"\n";
         }
+        print "\n";
     } elsif ($mode eq "aclbody") {
         my $header = shift;
         print "#include <config.h>\n";
@@ -1676,8 +1685,12 @@ elsif ($mode eq "client") {
         print "#include \"virerror.h\"\n";
         print "\n";
         print "#define VIR_FROM_THIS VIR_FROM_ACCESS\n";
+        print "\n";
+    } elsif ($mode eq "aclapi") {
+        print "<aclinfo>\n";
+    } else {
+        print "\n";
     }
-    print "\n";
 
     foreach (@keys) {
         my $call = $calls{$_};
@@ -1699,6 +1712,8 @@ elsif ($mode eq "client") {
                 print $apiname . "CheckACL;\n";
             }
             print $apiname . "EnsureACL;\n";
+        } elsif ($mode eq "aclapi") {
+            &generate_aclapi($call);
         } else {
             &generate_acl($call, $call->{acl}, "Ensure");
             if (defined $call->{aclfilter}) {
@@ -1835,5 +1850,41 @@ elsif ($mode eq "client") {
                 print "}\n\n";
             }
         }
+
+        sub generate_aclapi {
+            my $call = shift;
+
+            my $apiname = "vir" . $call->{ProcName};
+            if ($structprefix eq "qemu") {
+                $apiname =~ s/virDomain/virDomainQemu/;
+            } elsif ($structprefix eq "lxc") {
+                $apiname =~ s/virDomain/virDomainLxc/;
+            }
+
+            print "  <api name='$apiname'>\n";
+
+            my $acl = $call->{acl};
+            foreach (@{$acl}) {
+                my @bits = split /:/;
+                print "    <check object='$bits[0]' perm='$bits[1]'";
+                if (defined $bits[2]) {
+                    print " flags='$bits[2]'";
+                }
+                print "/>\n";
+            }
+
+            my $aclfilter = $call->{aclfilter};
+            foreach (@{$aclfilter}) {
+                my @bits = split /:/;
+                print "    <filter object='$bits[0]' perm='$bits[1]'/>\n";
+            }
+
+            print "  </api>\n";
+        }
+
+    }
+
+    if ($mode eq "aclapi") {
+        print "</aclinfo>\n";
     }
 }
-- 
1.8.1.4


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