secret: Introduce virSecretGetSecretString

Commit id 'fb2bd208' essentially copied the qemuGetSecretString
creating an libxlGetSecretString.  Rather than have multiple copies
of the same code, create src/secret/secret_util.{c,h} files and
place the common function in there.

Modify the the build in order to build the module as a library
which is then pulled in by both the qemu and libxl drivers for
usage from both qemu_command.c and libxl_conf.c

po/POTFILES.in

@@ -155,6 +155,7 @@ src/rpc/virnetserverservice.c
 src/rpc/virnetsshsession.c
 src/rpc/virnettlscontext.c
 src/secret/secret_driver.c
+src/secret/secret_util.c
 src/security/security_apparmor.c
 src/security/security_dac.c
 src/security/security_driver.c

src/Makefile.am

@@ -936,6 +936,9 @@ INTERFACE_DRIVER_SOURCES +=					\
 endif WITH_UDEV
 endif WITH_INTERFACE
 
+SECRET_UTIL_SOURCES =						\
+		secret/secret_util.h secret/secret_util.c
+
 SECRET_DRIVER_SOURCES =						\
 		secret/secret_driver.h secret/secret_driver.c
 
@@ -1123,6 +1126,12 @@ libvirt_cpu_la_CFLAGS = \
 		-I$(srcdir)/conf $(AM_CFLAGS)
 libvirt_cpu_la_SOURCES = $(CPU_SOURCES)
 
+noinst_LTLIBRARIES += libvirt_secret.la
+libvirt_la_BUILT_LIBADD += libvirt_secret.la
+libvirt_secret_la_CFLAGS = $(AM_CFLAGS)
+libvirt_secret_la_LDFLAGS = $(AM_LDFLAGS)
+libvirt_secret_la_SOURCES = $(SECRET_UTIL_SOURCES)
+
 if WITH_VMX
 noinst_LTLIBRARIES += libvirt_vmx.la
 libvirt_la_BUILT_LIBADD += libvirt_vmx.la
@@ -1303,10 +1312,13 @@ libvirt_driver_libxl_impl_la_CFLAGS = 		\
 		$(LIBXL_CFLAGS)			\
 		-I$(srcdir)/access	\
 		-I$(srcdir)/conf	\
+		-I$(srcdir)/secret      \
 		-I$(srcdir)/xenconfig	\
 		$(AM_CFLAGS)
 libvirt_driver_libxl_impl_la_LDFLAGS = $(AM_LDFLAGS)
-libvirt_driver_libxl_impl_la_LIBADD = $(LIBXL_LIBS) libvirt_xenconfig.la
+libvirt_driver_libxl_impl_la_LIBADD = $(LIBXL_LIBS) \
+				      libvirt_xenconfig.la \
+				      libvirt_secret.la
 libvirt_driver_libxl_impl_la_SOURCES = $(LIBXL_DRIVER_SOURCES)
 
 conf_DATA += libxl/libxl.conf
@@ -1337,12 +1349,14 @@ libvirt_driver_qemu_impl_la_CFLAGS = \
 		$(LIBNL_CFLAGS) \
 		-I$(srcdir)/access \
 		-I$(srcdir)/conf \
+		-I$(srcdir)/secret \
 		$(AM_CFLAGS)
 libvirt_driver_qemu_impl_la_LDFLAGS = $(AM_LDFLAGS)
 libvirt_driver_qemu_impl_la_LIBADD = $(CAPNG_LIBS) \
                                 $(GNUTLS_LIBS) \
 				$(LIBNL_LIBS) \
 				$(LIBXML_LIBS) \
+				libvirt_secret.la \
 				$(NULL)
 libvirt_driver_qemu_impl_la_SOURCES = $(QEMU_DRIVER_SOURCES)
 
@@ -1873,6 +1887,7 @@ EXTRA_DIST +=							\
 		$(SECURITY_DRIVER_SELINUX_SOURCES)		\
 		$(SECURITY_DRIVER_APPARMOR_SOURCES)		\
 		$(SECRET_DRIVER_SOURCES)			\
+		$(SECRET_UTIL_SOURCES)				\
 		$(VBOX_DRIVER_EXTRA_DIST)			\
 		$(VMWARE_DRIVER_SOURCES)			\
 		$(XENCONFIG_SOURCES)				\

src/libvirt_private.syms

@@ -1038,6 +1038,10 @@ nodeGetThreadsPerSubcore;
 nodeSetMemoryParameters;
 
 
+# secret/secret_util.h
+virSecretGetSecretString;
+
+
 # security/security_driver.h
 virSecurityDriverLookup;
 

src/libxl/libxl_conf.c

@@ -46,7 +46,7 @@
 #include "libxl_conf.h"
 #include "libxl_utils.h"
 #include "virstoragefile.h"
-#include "base64.h"
+#include "secret_util.h"
 
 
 #define VIR_FROM_THIS VIR_FROM_LIBXL
@@ -935,76 +935,6 @@ libxlDomainGetEmulatorType(const virDomainDef *def)
     return ret;
 }
 
-static char *
-libxlGetSecretString(virConnectPtr conn,
-                     const char *scheme,
-                     bool encoded,
-                     virStorageAuthDefPtr authdef,
-                     virSecretUsageType secretUsageType)
-{
-    size_t secret_size;
-    virSecretPtr sec = NULL;
-    char *secret = NULL;
-    char uuidStr[VIR_UUID_STRING_BUFLEN];
-
-    /* look up secret */
-    switch (authdef->secretType) {
-    case VIR_STORAGE_SECRET_TYPE_UUID:
-        sec = virSecretLookupByUUID(conn, authdef->secret.uuid);
-        virUUIDFormat(authdef->secret.uuid, uuidStr);
-        break;
-    case VIR_STORAGE_SECRET_TYPE_USAGE:
-        sec = virSecretLookupByUsage(conn, secretUsageType,
-                                     authdef->secret.usage);
-        break;
-    }
-
-    if (!sec) {
-        if (authdef->secretType == VIR_STORAGE_SECRET_TYPE_UUID) {
-            virReportError(VIR_ERR_NO_SECRET,
-                           _("%s no secret matches uuid '%s'"),
-                           scheme, uuidStr);
-        } else {
-            virReportError(VIR_ERR_NO_SECRET,
-                           _("%s no secret matches usage value '%s'"),
-                           scheme, authdef->secret.usage);
-        }
-        goto cleanup;
-    }
-
-    secret = (char *)conn->secretDriver->secretGetValue(sec, &secret_size, 0,
-                                                        VIR_SECRET_GET_VALUE_INTERNAL_CALL);
-    if (!secret) {
-        if (authdef->secretType == VIR_STORAGE_SECRET_TYPE_UUID) {
-            virReportError(VIR_ERR_INTERNAL_ERROR,
-                           _("could not get value of the secret for "
-                             "username '%s' using uuid '%s'"),
-                           authdef->username, uuidStr);
-        } else {
-            virReportError(VIR_ERR_INTERNAL_ERROR,
-                           _("could not get value of the secret for "
-                             "username '%s' using usage value '%s'"),
-                           authdef->username, authdef->secret.usage);
-        }
-        goto cleanup;
-    }
-
-    if (encoded) {
-        char *base64 = NULL;
-
-        base64_encode_alloc(secret, secret_size, &base64);
-        VIR_FREE(secret);
-        if (!base64) {
-            virReportOOMError();
-            goto cleanup;
-        }
-        secret = base64;
-    }
-
- cleanup:
-    virObjectUnref(sec);
-    return secret;
-}
 
 static char *
 libxlMakeNetworkDiskSrcStr(virStorageSourcePtr src,
@@ -1100,11 +1030,11 @@ libxlMakeNetworkDiskSrc(virStorageSourcePtr src, char **srcstr)
         if (!(conn = virConnectOpen("xen:///system")))
             goto cleanup;
 
-        if (!(secret = libxlGetSecretString(conn,
-                                            protocol,
-                                            true,
-                                            src->auth,
-                                            VIR_SECRET_USAGE_TYPE_CEPH)))
+        if (!(secret = virSecretGetSecretString(conn,
+                                                protocol,
+                                                true,
+                                                src->auth,
+                                                VIR_SECRET_USAGE_TYPE_CEPH)))
             goto cleanup;
     }
 

src/qemu/qemu_command.c

@@ -50,7 +50,7 @@
 #include "secret_conf.h"
 #include "network/bridge_driver.h"
 #include "virnetdevtap.h"
-#include "base64.h"
+#include "secret_util.h"
 #include "device_conf.h"
 #include "virstoragefile.h"
 #include "virtpm.h"
@@ -552,77 +552,6 @@ qemuSafeSerialParamValue(const char *value)
     return 0;
 }
 
-static char *
-qemuGetSecretString(virConnectPtr conn,
-                    const char *scheme,
-                    bool encoded,
-                    virStorageAuthDefPtr authdef,
-                    virSecretUsageType secretUsageType)
-{
-    size_t secret_size;
-    virSecretPtr sec = NULL;
-    char *secret = NULL;
-    char uuidStr[VIR_UUID_STRING_BUFLEN];
-
-    /* look up secret */
-    switch (authdef->secretType) {
-    case VIR_STORAGE_SECRET_TYPE_UUID:
-        sec = virSecretLookupByUUID(conn, authdef->secret.uuid);
-        virUUIDFormat(authdef->secret.uuid, uuidStr);
-        break;
-    case VIR_STORAGE_SECRET_TYPE_USAGE:
-        sec = virSecretLookupByUsage(conn, secretUsageType,
-                                     authdef->secret.usage);
-        break;
-    }
-
-    if (!sec) {
-        if (authdef->secretType == VIR_STORAGE_SECRET_TYPE_UUID) {
-            virReportError(VIR_ERR_NO_SECRET,
-                           _("%s no secret matches uuid '%s'"),
-                           scheme, uuidStr);
-        } else {
-            virReportError(VIR_ERR_NO_SECRET,
-                           _("%s no secret matches usage value '%s'"),
-                           scheme, authdef->secret.usage);
-        }
-        goto cleanup;
-    }
-
-    secret = (char *)conn->secretDriver->secretGetValue(sec, &secret_size, 0,
-                                                        VIR_SECRET_GET_VALUE_INTERNAL_CALL);
-    if (!secret) {
-        if (authdef->secretType == VIR_STORAGE_SECRET_TYPE_UUID) {
-            virReportError(VIR_ERR_INTERNAL_ERROR,
-                           _("could not get value of the secret for "
-                             "username '%s' using uuid '%s'"),
-                           authdef->username, uuidStr);
-        } else {
-            virReportError(VIR_ERR_INTERNAL_ERROR,
-                           _("could not get value of the secret for "
-                             "username '%s' using usage value '%s'"),
-                           authdef->username, authdef->secret.usage);
-        }
-        goto cleanup;
-    }
-
-    if (encoded) {
-        char *base64 = NULL;
-
-        base64_encode_alloc(secret, secret_size, &base64);
-        VIR_FREE(secret);
-        if (!base64) {
-            virReportOOMError();
-            goto cleanup;
-        }
-        secret = base64;
-    }
-
- cleanup:
-    virObjectUnref(sec);
-    return secret;
-}
-
 
 static int
 qemuNetworkDriveGetPort(int protocol,
@@ -933,11 +862,11 @@ qemuGetDriveSourceString(virStorageSourcePtr src,
                 secretType = VIR_SECRET_USAGE_TYPE_CEPH;
             }
 
-            if (!(secret = qemuGetSecretString(conn,
-                                               protocol,
-                                               encode,
-                                               src->auth,
-                                               secretType)))
+            if (!(secret = virSecretGetSecretString(conn,
+                                                    protocol,
+                                                    encode,
+                                                    src->auth,
+                                                    secretType)))
                 goto cleanup;
         }
     }
@@ -4525,8 +4454,8 @@ qemuBuildSCSIiSCSIHostdevDrvStr(virConnectPtr conn,
         int secretType = VIR_SECRET_USAGE_TYPE_ISCSI;
 
         username = iscsisrc->auth->username;
-        if (!(secret = qemuGetSecretString(conn, protocol, encode,
-                                           iscsisrc->auth, secretType)))
+        if (!(secret = virSecretGetSecretString(conn, protocol, encode,
+                                                iscsisrc->auth, secretType)))
             goto cleanup;
     }
 

src/secret/secret_util.c

+/*
+ * secret_util.c: secret related utility functions
+ *
+ * Copyright (C) 2016 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <config.h>
+
+#include "secret_util.h"
+#include "viralloc.h"
+#include "virerror.h"
+#include "virlog.h"
+#include "virobject.h"
+#include "viruuid.h"
+#include "base64.h"
+#include "datatypes.h"
+
+#define VIR_FROM_THIS VIR_FROM_SECRET
+
+VIR_LOG_INIT("secret.secret_util");
+
+
+/* virSecretGetSecretString:
+ * @conn: Pointer to the connection driver to make secret driver call
+ * @scheme: Unique enough string for error message to help determine cause
+ * @encoded: Whether the returned secret needs to be base64 encoded
+ * @authdef: Pointer to the disk storage authentication
+ * @secretUsageType: Type of secret usage for authdef lookup
+ *
+ * Lookup the secret for the authdef usage type and return it either as
+ * raw text or encoded based on the caller's need.
+ *
+ * Returns a pointer to memory that needs to be cleared and free'd after
+ * usage or NULL on error.
+ */
+char *
+virSecretGetSecretString(virConnectPtr conn,
+                         const char *scheme,
+                         bool encoded,
+                         virStorageAuthDefPtr authdef,
+                         virSecretUsageType secretUsageType)
+{
+    size_t secret_size;
+    virSecretPtr sec = NULL;
+    char *secret = NULL;
+    char uuidStr[VIR_UUID_STRING_BUFLEN];
+
+    /* look up secret */
+    switch (authdef->secretType) {
+    case VIR_STORAGE_SECRET_TYPE_UUID:
+        sec = virSecretLookupByUUID(conn, authdef->secret.uuid);
+        virUUIDFormat(authdef->secret.uuid, uuidStr);
+        break;
+    case VIR_STORAGE_SECRET_TYPE_USAGE:
+        sec = virSecretLookupByUsage(conn, secretUsageType,
+                                     authdef->secret.usage);
+        break;
+    }
+
+    if (!sec) {
+        if (authdef->secretType == VIR_STORAGE_SECRET_TYPE_UUID) {
+            virReportError(VIR_ERR_NO_SECRET,
+                           _("%s no secret matches uuid '%s'"),
+                           scheme, uuidStr);
+        } else {
+            virReportError(VIR_ERR_NO_SECRET,
+                           _("%s no secret matches usage value '%s'"),
+                           scheme, authdef->secret.usage);
+        }
+        goto cleanup;
+    }
+
+    secret = (char *)conn->secretDriver->secretGetValue(sec, &secret_size, 0,
+                                                        VIR_SECRET_GET_VALUE_INTERNAL_CALL);
+    if (!secret) {
+        if (authdef->secretType == VIR_STORAGE_SECRET_TYPE_UUID) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("could not get value of the secret for "
+                             "username '%s' using uuid '%s'"),
+                           authdef->username, uuidStr);
+        } else {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("could not get value of the secret for "
+                             "username '%s' using usage value '%s'"),
+                           authdef->username, authdef->secret.usage);
+        }
+        goto cleanup;
+    }
+
+    if (encoded) {
+        char *base64 = NULL;
+
+        base64_encode_alloc(secret, secret_size, &base64);
+        VIR_FREE(secret);
+        if (!base64) {
+            virReportOOMError();
+            goto cleanup;
+        }
+        secret = base64;
+    }
+
+ cleanup:
+    virObjectUnref(sec);
+    return secret;
+}

src/secret/secret_util.h

+/*
+ * secret_util.h: secret related utility functions
+ *
+ * Copyright (C) 2016 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef __VIR_SECRET_H__
+# define __VIR_SECRET_H__
+
+# include "internal.h"
+# include "virstoragefile.h"
+
+char *virSecretGetSecretString(virConnectPtr conn,
+                               const char *scheme,
+                               bool encoded,
+                               virStorageAuthDefPtr authdef,
+                               virSecretUsageType secretUsageType)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(4)
+    ATTRIBUTE_RETURN_CHECK;
+#endif /* __VIR_SECRET_H__ */