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-rw-r--r--hw/file-op-9p.h11
-rw-r--r--hw/virtio-9p-local.c95
-rw-r--r--hw/virtio-9p-xattr-user.c101
-rw-r--r--hw/virtio-9p-xattr.c152
-rw-r--r--hw/virtio-9p-xattr.h69
-rw-r--r--hw/virtio-9p.c6
6 files changed, 343 insertions, 91 deletions
diff --git a/hw/file-op-9p.h b/hw/file-op-9p.h
index d91b7e7996..bf867b924c 100644
--- a/hw/file-op-9p.h
+++ b/hw/file-op-9p.h
@@ -47,11 +47,14 @@ typedef struct FsCred
dev_t fc_rdev;
} FsCred;
+struct xattr_operations;
+
typedef struct FsContext
{
char *fs_root;
SecModel fs_sm;
uid_t uid;
+ struct xattr_operations **xops;
} FsContext;
extern void cred_init(FsCred *);
@@ -94,4 +97,12 @@ typedef struct FileOperations
int (*lremovexattr)(FsContext *, const char *, const char *);
void *opaque;
} FileOperations;
+
+static inline const char *rpath(FsContext *ctx, const char *path)
+{
+ /* FIXME: so wrong... */
+ static char buffer[4096];
+ snprintf(buffer, sizeof(buffer), "%s/%s", ctx->fs_root, path);
+ return buffer;
+}
#endif
diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c
index 57f92433d3..ee630334b8 100644
--- a/hw/virtio-9p-local.c
+++ b/hw/virtio-9p-local.c
@@ -12,6 +12,7 @@
*/
#include "virtio.h"
#include "virtio-9p.h"
+#include "virtio-9p-xattr.h"
#include <arpa/inet.h>
#include <pwd.h>
#include <grp.h>
@@ -19,14 +20,6 @@
#include <sys/un.h>
#include <attr/xattr.h>
-static const char *rpath(FsContext *ctx, const char *path)
-{
- /* FIXME: so wrong... */
- static char buffer[4096];
- snprintf(buffer, sizeof(buffer), "%s/%s", ctx->fs_root, path);
- return buffer;
-}
-
static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf)
{
@@ -497,103 +490,25 @@ static int local_statfs(FsContext *s, const char *path, struct statfs *stbuf)
static ssize_t local_lgetxattr(FsContext *ctx, const char *path,
const char *name, void *value, size_t size)
{
- if ((ctx->fs_sm == SM_MAPPED) &&
- (strncmp(name, "user.virtfs.", 12) == 0)) {
- /*
- * Don't allow fetch of user.virtfs namesapce
- * in case of mapped security
- */
- errno = ENOATTR;
- return -1;
- }
-
- return lgetxattr(rpath(ctx, path), name, value, size);
+ return v9fs_get_xattr(ctx, path, name, value, size);
}
static ssize_t local_llistxattr(FsContext *ctx, const char *path,
void *value, size_t size)
{
- ssize_t retval;
- ssize_t actual_len = 0;
- char *orig_value, *orig_value_start;
- char *temp_value, *temp_value_start;
- ssize_t xattr_len, parsed_len = 0, attr_len;
-
- if (ctx->fs_sm != SM_MAPPED) {
- return llistxattr(rpath(ctx, path), value, size);
- }
-
- /* Get the actual len */
- xattr_len = llistxattr(rpath(ctx, path), value, 0);
-
- /* Now fetch the xattr and find the actual size */
- orig_value = qemu_malloc(xattr_len);
- xattr_len = llistxattr(rpath(ctx, path), orig_value, xattr_len);
-
- /*
- * For mapped security model drop user.virtfs namespace
- * from the list
- */
- temp_value = qemu_mallocz(xattr_len);
- temp_value_start = temp_value;
- orig_value_start = orig_value;
- while (xattr_len > parsed_len) {
- attr_len = strlen(orig_value) + 1;
- if (strncmp(orig_value, "user.virtfs.", 12) != 0) {
- /* Copy this entry */
- strcat(temp_value, orig_value);
- temp_value += attr_len;
- actual_len += attr_len;
- }
- parsed_len += attr_len;
- orig_value += attr_len;
- }
- if (!size) {
- retval = actual_len;
- goto out;
- } else if (size >= actual_len) {
- /* now copy the parsed attribute list back */
- memset(value, 0, size);
- memcpy(value, temp_value_start, actual_len);
- retval = actual_len;
- goto out;
- }
- errno = ERANGE;
- retval = -1;
-out:
- qemu_free(orig_value_start);
- qemu_free(temp_value_start);
- return retval;
+ return v9fs_list_xattr(ctx, path, value, size);
}
static int local_lsetxattr(FsContext *ctx, const char *path, const char *name,
void *value, size_t size, int flags)
{
- if ((ctx->fs_sm == SM_MAPPED) &&
- (strncmp(name, "user.virtfs.", 12) == 0)) {
- /*
- * Don't allow fetch of user.virtfs namesapce
- * in case of mapped security
- */
- errno = EACCES;
- return -1;
- }
- return lsetxattr(rpath(ctx, path), name, value, size, flags);
+ return v9fs_set_xattr(ctx, path, name, value, size, flags);
}
static int local_lremovexattr(FsContext *ctx,
const char *path, const char *name)
{
- if ((ctx->fs_sm == SM_MAPPED) &&
- (strncmp(name, "user.virtfs.", 12) == 0)) {
- /*
- * Don't allow fetch of user.virtfs namesapce
- * in case of mapped security
- */
- errno = EACCES;
- return -1;
- }
- return lremovexattr(rpath(ctx, path), name);
+ return v9fs_remove_xattr(ctx, path, name);
}
diff --git a/hw/virtio-9p-xattr-user.c b/hw/virtio-9p-xattr-user.c
new file mode 100644
index 0000000000..b14dbb9a61
--- /dev/null
+++ b/hw/virtio-9p-xattr-user.c
@@ -0,0 +1,101 @@
+/*
+ * Virtio 9p user. xattr callback
+ *
+ * Copyright IBM, Corp. 2010
+ *
+ * Authors:
+ * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include <sys/types.h>
+#include "virtio.h"
+#include "virtio-9p.h"
+#include "file-op-9p.h"
+#include "virtio-9p-xattr.h"
+
+
+static ssize_t mp_user_getxattr(FsContext *ctx, const char *path,
+ const char *name, void *value, size_t size)
+{
+ if (strncmp(name, "user.virtfs.", 12) == 0) {
+ /*
+ * Don't allow fetch of user.virtfs namesapce
+ * in case of mapped security
+ */
+ errno = ENOATTR;
+ return -1;
+ }
+ return lgetxattr(rpath(ctx, path), name, value, size);
+}
+
+static ssize_t mp_user_listxattr(FsContext *ctx, const char *path,
+ char *name, void *value, size_t size)
+{
+ int name_size = strlen(name) + 1;
+ if (strncmp(name, "user.virtfs.", 12) == 0) {
+ /*
+ * Don't allow fetch of user.virtfs namesapce
+ * in case of mapped security
+ */
+ return 0;
+ }
+ if (!value) {
+ return name_size;
+ }
+
+ if (size < name_size) {
+ errno = ERANGE;
+ return -1;
+ }
+
+ strncpy(value, name, name_size);
+ return name_size;
+}
+
+static int mp_user_setxattr(FsContext *ctx, const char *path, const char *name,
+ void *value, size_t size, int flags)
+{
+ if (strncmp(name, "user.virtfs.", 12) == 0) {
+ /*
+ * Don't allow fetch of user.virtfs namesapce
+ * in case of mapped security
+ */
+ errno = EACCES;
+ return -1;
+ }
+ return lsetxattr(rpath(ctx, path), name, value, size, flags);
+}
+
+static int mp_user_removexattr(FsContext *ctx,
+ const char *path, const char *name)
+{
+ if (strncmp(name, "user.virtfs.", 12) == 0) {
+ /*
+ * Don't allow fetch of user.virtfs namesapce
+ * in case of mapped security
+ */
+ errno = EACCES;
+ return -1;
+ }
+ return lremovexattr(rpath(ctx, path), name);
+}
+
+XattrOperations mapped_user_xattr = {
+ .name = "user.",
+ .getxattr = mp_user_getxattr,
+ .setxattr = mp_user_setxattr,
+ .listxattr = mp_user_listxattr,
+ .removexattr = mp_user_removexattr,
+};
+
+XattrOperations passthrough_user_xattr = {
+ .name = "user.",
+ .getxattr = pt_getxattr,
+ .setxattr = pt_setxattr,
+ .listxattr = pt_listxattr,
+ .removexattr = pt_removexattr,
+};
diff --git a/hw/virtio-9p-xattr.c b/hw/virtio-9p-xattr.c
new file mode 100644
index 0000000000..5ddc3c9fef
--- /dev/null
+++ b/hw/virtio-9p-xattr.c
@@ -0,0 +1,152 @@
+/*
+ * Virtio 9p xattr callback
+ *
+ * Copyright IBM, Corp. 2010
+ *
+ * Authors:
+ * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "virtio.h"
+#include "virtio-9p.h"
+#include "file-op-9p.h"
+#include "virtio-9p-xattr.h"
+
+
+static XattrOperations *get_xattr_operations(XattrOperations **h,
+ const char *name)
+{
+ XattrOperations *xops;
+ for (xops = *(h)++; xops != NULL; xops = *(h)++) {
+ if (!strncmp(name, xops->name, strlen(xops->name))) {
+ return xops;
+ }
+ }
+ return NULL;
+}
+
+ssize_t v9fs_get_xattr(FsContext *ctx, const char *path,
+ const char *name, void *value, size_t size)
+{
+ XattrOperations *xops = get_xattr_operations(ctx->xops, name);
+ if (xops) {
+ return xops->getxattr(ctx, path, name, value, size);
+ }
+ errno = -EOPNOTSUPP;
+ return -1;
+}
+
+ssize_t pt_listxattr(FsContext *ctx, const char *path,
+ char *name, void *value, size_t size)
+{
+ int name_size = strlen(name) + 1;
+ if (!value) {
+ return name_size;
+ }
+
+ if (size < name_size) {
+ errno = ERANGE;
+ return -1;
+ }
+
+ strncpy(value, name, name_size);
+ return name_size;
+}
+
+
+/*
+ * Get the list and pass to each layer to find out whether
+ * to send the data or not
+ */
+ssize_t v9fs_list_xattr(FsContext *ctx, const char *path,
+ void *value, size_t vsize)
+{
+ ssize_t size = 0;
+ void *ovalue = value;
+ XattrOperations *xops;
+ char *orig_value, *orig_value_start;
+ ssize_t xattr_len, parsed_len = 0, attr_len;
+
+ /* Get the actual len */
+ xattr_len = llistxattr(rpath(ctx, path), value, 0);
+
+ /* Now fetch the xattr and find the actual size */
+ orig_value = qemu_malloc(xattr_len);
+ xattr_len = llistxattr(rpath(ctx, path), orig_value, xattr_len);
+
+ /* store the orig pointer */
+ orig_value_start = orig_value;
+ while (xattr_len > parsed_len) {
+ xops = get_xattr_operations(ctx->xops, orig_value);
+ if (!xops) {
+ goto next_entry;
+ }
+
+ if (!value) {
+ size += xops->listxattr(ctx, path, orig_value, value, vsize);
+ } else {
+ size = xops->listxattr(ctx, path, orig_value, value, vsize);
+ if (size < 0) {
+ goto err_out;
+ }
+ value += size;
+ vsize -= size;
+ }
+next_entry:
+ /* Got the next entry */
+ attr_len = strlen(orig_value) + 1;
+ parsed_len += attr_len;
+ orig_value += attr_len;
+ }
+ if (value) {
+ size = value - ovalue;
+ }
+
+err_out:
+ qemu_free(orig_value_start);
+ return size;
+}
+
+int v9fs_set_xattr(FsContext *ctx, const char *path, const char *name,
+ void *value, size_t size, int flags)
+{
+ XattrOperations *xops = get_xattr_operations(ctx->xops, name);
+ if (xops) {
+ return xops->setxattr(ctx, path, name, value, size, flags);
+ }
+ errno = -EOPNOTSUPP;
+ return -1;
+
+}
+
+int v9fs_remove_xattr(FsContext *ctx,
+ const char *path, const char *name)
+{
+ XattrOperations *xops = get_xattr_operations(ctx->xops, name);
+ if (xops) {
+ return xops->removexattr(ctx, path, name);
+ }
+ errno = -EOPNOTSUPP;
+ return -1;
+
+}
+
+XattrOperations *mapped_xattr_ops[] = {
+ &mapped_user_xattr,
+ NULL,
+};
+
+XattrOperations *passthrough_xattr_ops[] = {
+ &passthrough_user_xattr,
+ NULL,
+};
+
+/* for .user none model should be same as passthrough */
+XattrOperations *none_xattr_ops[] = {
+ &passthrough_user_xattr,
+ NULL,
+};
diff --git a/hw/virtio-9p-xattr.h b/hw/virtio-9p-xattr.h
new file mode 100644
index 0000000000..15632f8138
--- /dev/null
+++ b/hw/virtio-9p-xattr.h
@@ -0,0 +1,69 @@
+/*
+ * Virtio 9p
+ *
+ * Copyright IBM, Corp. 2010
+ *
+ * Authors:
+ * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+#ifndef _QEMU_VIRTIO_9P_XATTR_H
+#define _QEMU_VIRTIO_9P_XATTR_H
+
+#include <attr/xattr.h>
+
+typedef struct xattr_operations
+{
+ const char *name;
+ ssize_t (*getxattr)(FsContext *ctx, const char *path,
+ const char *name, void *value, size_t size);
+ ssize_t (*listxattr)(FsContext *ctx, const char *path,
+ char *name, void *value, size_t size);
+ int (*setxattr)(FsContext *ctx, const char *path, const char *name,
+ void *value, size_t size, int flags);
+ int (*removexattr)(FsContext *ctx,
+ const char *path, const char *name);
+} XattrOperations;
+
+
+extern XattrOperations mapped_user_xattr;
+extern XattrOperations passthrough_user_xattr;
+
+extern XattrOperations *mapped_xattr_ops[];
+extern XattrOperations *passthrough_xattr_ops[];
+extern XattrOperations *none_xattr_ops[];
+
+extern ssize_t v9fs_get_xattr(FsContext *ctx, const char *path,
+ const char *name, void *value, size_t size);
+extern ssize_t v9fs_list_xattr(FsContext *ctx, const char *path,
+ void *value, size_t vsize);
+extern int v9fs_set_xattr(FsContext *ctx, const char *path, const char *name,
+ void *value, size_t size, int flags);
+extern int v9fs_remove_xattr(FsContext *ctx,
+ const char *path, const char *name);
+extern ssize_t pt_listxattr(FsContext *ctx, const char *path,
+ char *name, void *value, size_t size);
+
+static inline ssize_t pt_getxattr(FsContext *ctx, const char *path,
+ const char *name, void *value, size_t size)
+{
+ return lgetxattr(rpath(ctx, path), name, value, size);
+}
+
+static inline int pt_setxattr(FsContext *ctx, const char *path,
+ const char *name, void *value,
+ size_t size, int flags)
+{
+ return lsetxattr(rpath(ctx, path), name, value, size, flags);
+}
+
+static inline int pt_removexattr(FsContext *ctx,
+ const char *path, const char *name)
+{
+ return lremovexattr(rpath(ctx, path), name);
+}
+
+#endif
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index cb6366bcc6..4586ccefb4 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -17,6 +17,7 @@
#include "virtio-9p.h"
#include "fsdev/qemu-fsdev.h"
#include "virtio-9p-debug.h"
+#include "virtio-9p-xattr.h"
int debug_9p_pdu;
@@ -3712,23 +3713,26 @@ VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
if (!strcmp(fse->security_model, "passthrough")) {
/* Files on the Fileserver set to client user credentials */
s->ctx.fs_sm = SM_PASSTHROUGH;
+ s->ctx.xops = passthrough_xattr_ops;
} else if (!strcmp(fse->security_model, "mapped")) {
/* Files on the fileserver are set to QEMU credentials.
* Client user credentials are saved in extended attributes.
*/
s->ctx.fs_sm = SM_MAPPED;
+ s->ctx.xops = mapped_xattr_ops;
} else if (!strcmp(fse->security_model, "none")) {
/*
* Files on the fileserver are set to QEMU credentials.
*/
s->ctx.fs_sm = SM_NONE;
-
+ s->ctx.xops = none_xattr_ops;
} else {
fprintf(stderr, "Default to security_model=none. You may want"
" enable advanced security model using "
"security option:\n\t security_model=passthrough \n\t "
"security_model=mapped\n");
s->ctx.fs_sm = SM_NONE;
+ s->ctx.xops = none_xattr_ops;
}
if (lstat(fse->path, &stat)) {
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-03 12:12:59 +0000