[libvirt] [PATCH 9/9] remote: pass identity across to newly opened daemons
Daniel P. Berrangé
berrange at redhat.com
Thu Sep 5 11:56:27 UTC 2019
When opening a connection to a second driver inside the daemon, we must
ensure the identity of the current user is passed across. This allows
the second daemon to perform access control checks against the real end
users, instead of against the libvirt daemon that's proxying across the
API calls.
Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
---
src/libvirt_remote.syms | 1 +
src/remote/remote_daemon_dispatch.c | 112 +++++++++++++++++++++++++---
src/remote/remote_driver.c | 1 +
src/remote/remote_protocol.x | 16 +++-
src/remote_protocol-structs | 8 ++
src/rpc/virnetserverclient.c | 12 +++
src/rpc/virnetserverclient.h | 2 +
7 files changed, 139 insertions(+), 13 deletions(-)
diff --git a/src/libvirt_remote.syms b/src/libvirt_remote.syms
index 3307d74324..0493467f46 100644
--- a/src/libvirt_remote.syms
+++ b/src/libvirt_remote.syms
@@ -178,6 +178,7 @@ virNetServerClientSetAuthLocked;
virNetServerClientSetAuthPendingLocked;
virNetServerClientSetCloseHook;
virNetServerClientSetDispatcher;
+virNetServerClientSetIdentity;
virNetServerClientSetQuietEOF;
virNetServerClientSetReadonly;
virNetServerClientStartKeepAlive;
diff --git a/src/remote/remote_daemon_dispatch.c b/src/remote/remote_daemon_dispatch.c
index ecde959088..dbd2985c38 100644
--- a/src/remote/remote_daemon_dispatch.c
+++ b/src/remote/remote_daemon_dispatch.c
@@ -51,6 +51,7 @@
#include "virpolkit.h"
#include "virthreadjob.h"
#include "configmake.h"
+#include "access/viraccessapicheck.h"
#define VIR_FROM_THIS VIR_FROM_RPC
@@ -1945,10 +1946,16 @@ static void remoteClientCloseFunc(virNetServerClientPtr client)
static int
remoteOpenConn(const char *uri,
bool readonly,
+ bool preserveIdentity,
virConnectPtr *conn)
{
- VIR_DEBUG("Getting secondary uri=%s readonly=%d conn=%p",
- NULLSTR(uri), readonly, conn);
+ virTypedParameterPtr params = NULL;
+ int nparams = 0;
+ int ret = -1;
+
+ VIR_DEBUG("Getting secondary uri=%s readonly=%d preserveIdent=%d conn=%p",
+ NULLSTR(uri), readonly, preserveIdentity, conn);
+
if (*conn)
return 0;
@@ -1957,16 +1964,43 @@ remoteOpenConn(const char *uri,
return -1;
}
+ if (preserveIdentity) {
+ VIR_AUTOUNREF(virIdentityPtr) ident = NULL;
+
+ if (!(ident = virIdentityGetCurrent()))
+ return -1;
+
+ if (virIdentityGetParameters(ident, ¶ms, &nparams) < 0)
+ goto error;
+ }
+
VIR_DEBUG("Opening driver %s", uri);
if (readonly)
*conn = virConnectOpenReadOnly(uri);
else
*conn = virConnectOpen(uri);
if (!*conn)
- return -1;
+ goto error;
VIR_DEBUG("Opened driver %p", *conn);
- return 0;
+ if (preserveIdentity) {
+ if (virConnectSetIdentity(*conn, params, nparams, 0) < 0)
+ goto error;
+
+ VIR_DEBUG("Forwarded current identity to secondary driver");
+ }
+
+ ret = 0;
+ cleanup:
+ virTypedParamsFree(params, nparams);
+ return ret;
+
+ error:
+ if (*conn) {
+ virConnectClose(*conn);
+ *conn = NULL;
+ }
+ goto cleanup;
}
@@ -1993,6 +2027,7 @@ remoteGetInterfaceConn(virNetServerClientPtr client)
if (remoteOpenConn(priv->interfaceURI,
priv->readonly,
+ true,
&priv->interfaceConn) < 0)
return NULL;
@@ -2008,6 +2043,7 @@ remoteGetNetworkConn(virNetServerClientPtr client)
if (remoteOpenConn(priv->networkURI,
priv->readonly,
+ true,
&priv->networkConn) < 0)
return NULL;
@@ -2023,6 +2059,7 @@ remoteGetNodeDevConn(virNetServerClientPtr client)
if (remoteOpenConn(priv->nodedevURI,
priv->readonly,
+ true,
&priv->nodedevConn) < 0)
return NULL;
@@ -2038,6 +2075,7 @@ remoteGetNWFilterConn(virNetServerClientPtr client)
if (remoteOpenConn(priv->nwfilterURI,
priv->readonly,
+ true,
&priv->nwfilterConn) < 0)
return NULL;
@@ -2053,6 +2091,7 @@ remoteGetSecretConn(virNetServerClientPtr client)
if (remoteOpenConn(priv->secretURI,
priv->readonly,
+ true,
&priv->secretConn) < 0)
return NULL;
@@ -2068,6 +2107,7 @@ remoteGetStorageConn(virNetServerClientPtr client)
if (remoteOpenConn(priv->storageURI,
priv->readonly,
+ true,
&priv->storageConn) < 0)
return NULL;
@@ -2237,6 +2277,7 @@ remoteDispatchConnectOpen(virNetServerPtr server ATTRIBUTE_UNUSED,
#ifdef MODULE_NAME
const char *type = NULL;
#endif /* !MODULE_NAME */
+ bool preserveIdentity = false;
VIR_DEBUG("priv=%p conn=%p", priv, priv->conn);
virMutexLock(&priv->lock);
@@ -2264,16 +2305,16 @@ remoteDispatchConnectOpen(virNetServerPtr server ATTRIBUTE_UNUSED,
name = probeduri;
}
-#endif
+
+ preserveIdentity = true;
+#endif /* VIRTPROXYD */
VIR_DEBUG("Opening driver %s", name);
- if (priv->readonly) {
- if (!(priv->conn = virConnectOpenReadOnly(name)))
- goto cleanup;
- } else {
- if (!(priv->conn = virConnectOpen(name)))
- goto cleanup;
- }
+ if (remoteOpenConn(name,
+ priv->readonly,
+ preserveIdentity,
+ &priv->conn) < 0)
+ goto cleanup;
VIR_DEBUG("Opened %p", priv->conn);
#ifdef MODULE_NAME
@@ -2384,6 +2425,53 @@ remoteDispatchConnectClose(virNetServerPtr server ATTRIBUTE_UNUSED,
}
+static int
+remoteDispatchConnectSetIdentity(virNetServerPtr server ATTRIBUTE_UNUSED,
+ virNetServerClientPtr client,
+ virNetMessagePtr msg ATTRIBUTE_UNUSED,
+ virNetMessageErrorPtr rerr,
+ remote_connect_set_identity_args *args)
+{
+ virTypedParameterPtr params = NULL;
+ int nparams = 0;
+ int rv = -1;
+ virConnectPtr conn = remoteGetHypervisorConn(client);
+ VIR_AUTOUNREF(virIdentityPtr) ident = NULL;
+ if (!conn)
+ goto cleanup;
+
+ VIR_DEBUG("Received forwarded identity");
+ if (virTypedParamsDeserialize((virTypedParameterRemotePtr) args->params.params_val,
+ args->params.params_len,
+ REMOTE_CONNECT_IDENTITY_PARAMS_MAX,
+ ¶ms,
+ &nparams) < 0)
+ goto cleanup;
+
+ VIR_TYPED_PARAMS_DEBUG(params, nparams);
+
+ if (virConnectSetIdentityEnsureACL(conn) < 0)
+ goto cleanup;
+
+ if (!(ident = virIdentityNew()))
+ goto cleanup;
+
+ if (virIdentitySetParameters(ident, params, nparams) < 0)
+ goto cleanup;
+
+ virNetServerClientSetIdentity(client, ident);
+
+ rv = 0;
+
+ cleanup:
+ virTypedParamsFree(params, nparams);
+ if (rv < 0)
+ virNetMessageSaveError(rerr);
+ return rv;
+}
+
+
+
static int
remoteDispatchDomainGetSchedulerType(virNetServerPtr server ATTRIBUTE_UNUSED,
virNetServerClientPtr client,
diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c
index 2b86f55035..8789c5da00 100644
--- a/src/remote/remote_driver.c
+++ b/src/remote/remote_driver.c
@@ -8507,6 +8507,7 @@ static virHypervisorDriver hypervisor_driver = {
.name = "remote",
.connectOpen = remoteConnectOpen, /* 0.3.0 */
.connectClose = remoteConnectClose, /* 0.3.0 */
+ .connectSetIdentity = remoteConnectSetIdentity, /* 5.8.0 */
.connectSupportsFeature = remoteConnectSupportsFeature, /* 0.3.0 */
.connectGetType = remoteConnectGetType, /* 0.3.0 */
.connectGetVersion = remoteConnectGetVersion, /* 0.3.0 */
diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x
index 75c2bc69ff..f4e3392212 100644
--- a/src/remote/remote_protocol.x
+++ b/src/remote/remote_protocol.x
@@ -53,6 +53,9 @@ typedef string remote_nonnull_string<REMOTE_STRING_MAX>;
/* A long string, which may be NULL. */
typedef remote_nonnull_string *remote_string;
+/* Upper limit on identity parameters */
+const REMOTE_CONNECT_IDENTITY_PARAMS_MAX = 20;
+
/* Upper limit on lists of domains. */
const REMOTE_DOMAIN_LIST_MAX = 16384;
@@ -3736,6 +3739,11 @@ struct remote_domain_get_guest_info_ret {
remote_typed_param params<REMOTE_DOMAIN_GUEST_INFO_PARAMS_MAX>;
};
+struct remote_connect_set_identity_args {
+ remote_typed_param params<REMOTE_CONNECT_IDENTITY_PARAMS_MAX>;
+ unsigned int flags;
+};
+
/*----- Protocol. -----*/
/* Define the program number, protocol version and procedure numbers here. */
@@ -6603,5 +6611,11 @@ enum remote_procedure {
* @generate: none
* @acl: domain:write
*/
- REMOTE_PROC_DOMAIN_GET_GUEST_INFO = 418
+ REMOTE_PROC_DOMAIN_GET_GUEST_INFO = 418,
+
+ /**
+ * @generate: client
+ * @acl: connect:write
+ */
+ REMOTE_PROC_CONNECT_SET_IDENTITY = 419
};
diff --git a/src/remote_protocol-structs b/src/remote_protocol-structs
index 616c3d5d52..71169c4148 100644
--- a/src/remote_protocol-structs
+++ b/src/remote_protocol-structs
@@ -3115,6 +3115,13 @@ struct remote_domain_get_guest_info_ret {
u_int params_len;
remote_typed_param * params_val;
} params;
+}
+struct remote_connect_set_identity_args {
+ struct {
+ u_int params_len;
+ remote_typed_param * params_val;
+ } params;
+ u_int flags;
};
enum remote_procedure {
REMOTE_PROC_CONNECT_OPEN = 1,
@@ -3535,4 +3542,5 @@ enum remote_procedure {
REMOTE_PROC_DOMAIN_CHECKPOINT_GET_PARENT = 416,
REMOTE_PROC_DOMAIN_CHECKPOINT_DELETE = 417,
REMOTE_PROC_DOMAIN_GET_GUEST_INFO = 418,
+ REMOTE_PROC_CONNECT_SET_IDENTITY = 419,
};
diff --git a/src/rpc/virnetserverclient.c b/src/rpc/virnetserverclient.c
index 1b96d0339b..171ee636dd 100644
--- a/src/rpc/virnetserverclient.c
+++ b/src/rpc/virnetserverclient.c
@@ -844,6 +844,18 @@ virIdentityPtr virNetServerClientGetIdentity(virNetServerClientPtr client)
}
+void virNetServerClientSetIdentity(virNetServerClientPtr client,
+ virIdentityPtr identity)
+{
+ virObjectLock(client);
+ virObjectUnref(client->identity);
+ client->identity = identity;
+ if (client->identity)
+ virObjectRef(client->identity);
+ virObjectUnlock(client);
+}
+
+
int virNetServerClientGetSELinuxContext(virNetServerClientPtr client,
char **context)
{
diff --git a/src/rpc/virnetserverclient.h b/src/rpc/virnetserverclient.h
index 1b01bedbcb..1c520fef6b 100644
--- a/src/rpc/virnetserverclient.h
+++ b/src/rpc/virnetserverclient.h
@@ -123,6 +123,8 @@ int virNetServerClientGetSELinuxContext(virNetServerClientPtr client,
char **context);
virIdentityPtr virNetServerClientGetIdentity(virNetServerClientPtr client);
+void virNetServerClientSetIdentity(virNetServerClientPtr client,
+ virIdentityPtr identity);
void *virNetServerClientGetPrivateData(virNetServerClientPtr client);
--
2.21.0
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