hw/9pfs: Add new security model mapped-file.

This enable us to do passthrough equivalent security model on NFS directory.
NFS server mostly do root squashing and don't support xattr. Hence we cannot
use 'passthrough' or 'mapped' security model

Also added "mapped-xattr" security to indicate earlier "mapped" security model
Older name is still supported.

POSIX rules regarding ctime update on chmod are not followed by this security model.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

3 files changed, 360 insertions, 13 deletions

diff --git a/hw/9pfs/cofile.c b/hw/9pfs/cofile.c
index b15838c1e6..9345aaeb2e 100644
--- a/hw/9pfs/cofile.c
+++ b/hw/9pfs/cofile.c
@@ -76,6 +76,20 @@ int v9fs_co_fstat(V9fsPDU *pdu, V9fsFidState *fidp, struct stat *stbuf)
                 err = -errno;
             }
         });
+    /*
+     * Some FS driver (local:mapped-file) can't support fetching attributes
+     * using file descriptor. Use Path name in that case.
+     */
+    if (err == -EOPNOTSUPP) {
+        err = v9fs_co_lstat(pdu, &fidp->path, stbuf);
+        if (err == -ENOENT) {
+            /*
+             * fstat on an unlinked file. Work with partial results
+             * returned from s->ops->fstat
+             */
+            err = 0;
+        }
+    }
     return err;
 }
 
diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
index 642d5e2c46..41a1a820e0 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -91,15 +91,6 @@ VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
         s->ctx.fs_root = NULL;
     }
     s->ctx.exops.get_st_gen = NULL;
-
-    if (fse->export_flags & V9FS_SM_PASSTHROUGH) {
-        s->ctx.xops = passthrough_xattr_ops;
-    } else if (fse->export_flags & V9FS_SM_MAPPED) {
-        s->ctx.xops = mapped_xattr_ops;
-    } else if (fse->export_flags & V9FS_SM_NONE) {
-        s->ctx.xops = none_xattr_ops;
-    }
-
     len = strlen(conf->tag);
     if (len > MAX_TAG_LEN - 1) {
         fprintf(stderr, "mount tag '%s' (%d bytes) is longer than "
diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
index 3ae6ef2e39..6e3f9d1d97 100644
--- a/hw/9pfs/virtio-9p-local.c
+++ b/hw/9pfs/virtio-9p-local.c
@@ -20,6 +20,7 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 #include "qemu-xattr.h"
+#include <libgen.h>
 #include <linux/fs.h>
 #ifdef CONFIG_LINUX_MAGIC_H
 #include <linux/magic.h>
@@ -39,6 +40,54 @@
 #define BTRFS_SUPER_MAGIC 0x9123683E
 #endif
 
+#define VIRTFS_META_DIR ".virtfs_metadata"
+
+static const char *local_mapped_attr_path(FsContext *ctx,
+                                          const char *path, char *buffer)
+{
+    char *dir_name;
+    char *tmp_path = strdup(path);
+    char *base_name = basename(tmp_path);
+
+    /* NULL terminate the directory */
+    dir_name = tmp_path;
+    *(base_name - 1) = '\0';
+
+    snprintf(buffer, PATH_MAX, "%s/%s/%s/%s",
+             ctx->fs_root, dir_name, VIRTFS_META_DIR, base_name);
+    free(tmp_path);
+    return buffer;
+}
+
+#define ATTR_MAX 100
+static void local_mapped_file_attr(FsContext *ctx, const char *path,
+                                   struct stat *stbuf)
+{
+    FILE *fp;
+    char buf[ATTR_MAX];
+    char attr_path[PATH_MAX];
+
+    local_mapped_attr_path(ctx, path, attr_path);
+    fp = fopen(attr_path, "r");
+    if (!fp) {
+        return;
+    }
+    memset(buf, 0, ATTR_MAX);
+    while (fgets(buf, ATTR_MAX, fp)) {
+        if (!strncmp(buf, "virtfs.uid", 10)) {
+            stbuf->st_uid = atoi(buf+11);
+        } else if (!strncmp(buf, "virtfs.gid", 10)) {
+            stbuf->st_gid = atoi(buf+11);
+        } else if (!strncmp(buf, "virtfs.mode", 11)) {
+            stbuf->st_mode = atoi(buf+12);
+        } else if (!strncmp(buf, "virtfs.rdev", 11)) {
+            stbuf->st_rdev = atoi(buf+12);
+        }
+        memset(buf, 0, ATTR_MAX);
+    }
+    fclose(fp);
+}
+
 static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
 {
     int err;
@@ -71,10 +120,103 @@ static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
                         sizeof(dev_t)) > 0) {
                 stbuf->st_rdev = tmp_dev;
         }
+    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+        local_mapped_file_attr(fs_ctx, path, stbuf);
+    }
+    return err;
+}
+
+static int local_create_mapped_attr_dir(FsContext *ctx, const char *path)
+{
+    int err;
+    char attr_dir[PATH_MAX];
+    char *tmp_path = strdup(path);
+
+    snprintf(attr_dir, PATH_MAX, "%s/%s/%s",
+             ctx->fs_root, dirname(tmp_path), VIRTFS_META_DIR);
+
+    err = mkdir(attr_dir, 0700);
+    if (err < 0 && errno == EEXIST) {
+        err = 0;
     }
+    free(tmp_path);
     return err;
 }
 
+static int local_set_mapped_file_attr(FsContext *ctx,
+                                      const char *path, FsCred *credp)
+{
+    FILE *fp;
+    int ret = 0;
+    char buf[ATTR_MAX];
+    char attr_path[PATH_MAX];
+    int uid = -1, gid = -1, mode = -1, rdev = -1;
+
+    fp = fopen(local_mapped_attr_path(ctx, path, attr_path), "r");
+    if (!fp) {
+        goto create_map_file;
+    }
+    memset(buf, 0, ATTR_MAX);
+    while (fgets(buf, ATTR_MAX, fp)) {
+        if (!strncmp(buf, "virtfs.uid", 10)) {
+            uid = atoi(buf+11);
+        } else if (!strncmp(buf, "virtfs.gid", 10)) {
+            gid = atoi(buf+11);
+        } else if (!strncmp(buf, "virtfs.mode", 11)) {
+            mode = atoi(buf+12);
+        } else if (!strncmp(buf, "virtfs.rdev", 11)) {
+            rdev = atoi(buf+12);
+        }
+        memset(buf, 0, ATTR_MAX);
+    }
+    fclose(fp);
+    goto update_map_file;
+
+create_map_file:
+    ret = local_create_mapped_attr_dir(ctx, path);
+    if (ret < 0) {
+        goto err_out;
+    }
+
+update_map_file:
+    fp = fopen(attr_path, "w");
+    if (!fp) {
+        ret = -1;
+        goto err_out;
+    }
+
+    if (credp->fc_uid != -1) {
+        uid = credp->fc_uid;
+    }
+    if (credp->fc_gid != -1) {
+        gid = credp->fc_gid;
+    }
+    if (credp->fc_mode != -1) {
+        mode = credp->fc_mode;
+    }
+    if (credp->fc_rdev != -1) {
+        rdev = credp->fc_rdev;
+    }
+
+
+    if (uid != -1) {
+        fprintf(fp, "virtfs.uid=%d\n", uid);
+    }
+    if (gid != -1) {
+        fprintf(fp, "virtfs.gid=%d\n", gid);
+    }
+    if (mode != -1) {
+        fprintf(fp, "virtfs.mode=%d\n", mode);
+    }
+    if (rdev != -1) {
+        fprintf(fp, "virtfs.rdev=%d\n", rdev);
+    }
+    fclose(fp);
+
+err_out:
+    return ret;
+}
+
 static int local_set_xattr(const char *path, FsCred *credp)
 {
     int err;
@@ -138,7 +280,8 @@ static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
     char buffer[PATH_MAX];
     char *path = fs_path->data;
 
-    if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
+    if ((fs_ctx->export_flags & V9FS_SM_MAPPED) ||
+        (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
         int fd;
         fd = open(rpath(fs_ctx, path, buffer), O_RDONLY);
         if (fd == -1) {
@@ -203,7 +346,18 @@ static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs,
                            struct dirent *entry,
                            struct dirent **result)
 {
-    return readdir_r(fs->dir, entry, result);
+    int ret;
+
+again:
+    ret = readdir_r(fs->dir, entry, result);
+    if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+        if (!ret && *result != NULL &&
+            !strcmp(entry->d_name, VIRTFS_META_DIR)) {
+            /* skp the meta data directory */
+            goto again;
+        }
+    }
+    return ret;
 }
 
 static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
@@ -264,6 +418,8 @@ static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
 
     if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
         return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
+    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+        return local_set_mapped_file_attr(fs_ctx, path, credp);
     } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
                (fs_ctx->export_flags & V9FS_SM_NONE)) {
         return chmod(rpath(fs_ctx, path, buffer), credp->fc_mode);
@@ -296,6 +452,18 @@ static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
             serrno = errno;
             goto err_end;
         }
+    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+
+        err = mknod(rpath(fs_ctx, path, buffer),
+                    SM_LOCAL_MODE_BITS|S_IFREG, 0);
+        if (err == -1) {
+            goto out;
+        }
+        err = local_set_mapped_file_attr(fs_ctx, path, credp);
+        if (err == -1) {
+            serrno = errno;
+            goto err_end;
+        }
     } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
                (fs_ctx->export_flags & V9FS_SM_NONE)) {
         err = mknod(rpath(fs_ctx, path, buffer), credp->fc_mode,
@@ -344,6 +512,17 @@ static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
             serrno = errno;
             goto err_end;
         }
+    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+        err = mkdir(rpath(fs_ctx, path, buffer), SM_LOCAL_DIR_MODE_BITS);
+        if (err == -1) {
+            goto out;
+        }
+        credp->fc_mode = credp->fc_mode|S_IFDIR;
+        err = local_set_mapped_file_attr(fs_ctx, path, credp);
+        if (err == -1) {
+            serrno = errno;
+            goto err_end;
+        }
     } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
                (fs_ctx->export_flags & V9FS_SM_NONE)) {
         err = mkdir(rpath(fs_ctx, path, buffer), credp->fc_mode);
@@ -404,6 +583,9 @@ static int local_fstat(FsContext *fs_ctx, int fid_type,
                       &tmp_dev, sizeof(dev_t)) > 0) {
                 stbuf->st_rdev = tmp_dev;
         }
+    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+        errno = EOPNOTSUPP;
+        return -1;
     }
     return err;
 }
@@ -436,6 +618,19 @@ static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
             serrno = errno;
             goto err_end;
         }
+    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+        fd = open(rpath(fs_ctx, path, buffer), flags, SM_LOCAL_MODE_BITS);
+        if (fd == -1) {
+            err = fd;
+            goto out;
+        }
+        credp->fc_mode = credp->fc_mode|S_IFREG;
+        /* Set client credentials in .virtfs_metadata directory files */
+        err = local_set_mapped_file_attr(fs_ctx, path, credp);
+        if (err == -1) {
+            serrno = errno;
+            goto err_end;
+        }
     } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
                (fs_ctx->export_flags & V9FS_SM_NONE)) {
         fd = open(rpath(fs_ctx, path, buffer), flags, credp->fc_mode);
@@ -506,6 +701,35 @@ static int local_symlink(FsContext *fs_ctx, const char *oldpath,
             serrno = errno;
             goto err_end;
         }
+    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+        int fd;
+        ssize_t oldpath_size, write_size;
+        fd = open(rpath(fs_ctx, newpath, buffer), O_CREAT|O_EXCL|O_RDWR,
+                  SM_LOCAL_MODE_BITS);
+        if (fd == -1) {
+            err = fd;
+            goto out;
+        }
+        /* Write the oldpath (target) to the file. */
+        oldpath_size = strlen(oldpath);
+        do {
+            write_size = write(fd, (void *)oldpath, oldpath_size);
+        } while (write_size == -1 && errno == EINTR);
+
+        if (write_size != oldpath_size) {
+            serrno = errno;
+            close(fd);
+            err = -1;
+            goto err_end;
+        }
+        close(fd);
+        /* Set cleint credentials in symlink's xattr */
+        credp->fc_mode = credp->fc_mode|S_IFLNK;
+        err = local_set_mapped_file_attr(fs_ctx, newpath, credp);
+        if (err == -1) {
+            serrno = errno;
+            goto err_end;
+        }
     } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
                (fs_ctx->export_flags & V9FS_SM_NONE)) {
         err = symlink(oldpath, rpath(fs_ctx, newpath, buffer));
@@ -548,6 +772,21 @@ static int local_link(FsContext *ctx, V9fsPath *oldpath,
 
     ret = link(rpath(ctx, oldpath->data, buffer),
                rpath(ctx, newpath.data, buffer1));
+
+    /* now link the virtfs_metadata files */
+    if (!ret && (ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
+        /* Link the .virtfs_metadata files. Create the metada directory */
+        ret = local_create_mapped_attr_dir(ctx, newpath.data);
+        if (ret < 0) {
+            goto err_out;
+        }
+        ret = link(local_mapped_attr_path(ctx, oldpath->data, buffer),
+                   local_mapped_attr_path(ctx, newpath.data, buffer1));
+        if (ret < 0 && errno != ENOENT) {
+            goto err_out;
+        }
+    }
+err_out:
     v9fs_string_free(&newpath);
     return ret;
 }
@@ -563,8 +802,21 @@ static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
 static int local_rename(FsContext *ctx, const char *oldpath,
                         const char *newpath)
 {
+    int err;
     char buffer[PATH_MAX], buffer1[PATH_MAX];
 
+    if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+        err = local_create_mapped_attr_dir(ctx, newpath);
+        if (err < 0) {
+            return err;
+        }
+        /* rename the .virtfs_metadata files */
+        err = rename(local_mapped_attr_path(ctx, oldpath, buffer),
+                     local_mapped_attr_path(ctx, newpath, buffer1));
+        if (err < 0 && errno != ENOENT) {
+            return err;
+        }
+    }
     return rename(rpath(ctx, oldpath, buffer), rpath(ctx, newpath, buffer1));
 }
 
@@ -580,6 +832,8 @@ static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
                       credp->fc_uid, credp->fc_gid);
     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
         return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
+    } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+        return local_set_mapped_file_attr(fs_ctx, path, credp);
     }
     return -1;
 }
@@ -595,8 +849,46 @@ static int local_utimensat(FsContext *s, V9fsPath *fs_path,
 
 static int local_remove(FsContext *ctx, const char *path)
 {
+    int err;
+    struct stat stbuf;
     char buffer[PATH_MAX];
+
+    if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+        err =  lstat(rpath(ctx, path, buffer), &stbuf);
+        if (err) {
+            goto err_out;
+        }
+        /*
+         * If directory remove .virtfs_metadata contained in the
+         * directory
+         */
+        if (S_ISDIR(stbuf.st_mode)) {
+            sprintf(buffer, "%s/%s/%s", ctx->fs_root, path, VIRTFS_META_DIR);
+            err = remove(buffer);
+            if (err < 0 && errno != ENOENT) {
+                /*
+                 * We didn't had the .virtfs_metadata file. May be file created
+                 * in non-mapped mode ?. Ignore ENOENT.
+                 */
+                goto err_out;
+            }
+        }
+        /*
+         * Now remove the name from parent directory
+         * .virtfs_metadata directory
+         */
+        err = remove(local_mapped_attr_path(ctx, path, buffer));;
+        if (err < 0 && errno != ENOENT) {
+            /*
+             * We didn't had the .virtfs_metadata file. May be file created
+             * in non-mapped mode ?. Ignore ENOENT.
+             */
+            goto err_out;
+        }
+    }
     return remove(rpath(ctx, path, buffer));
+err_out:
+    return err;
 }
 
 static int local_fsync(FsContext *ctx, int fid_type,
@@ -696,12 +988,45 @@ static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
     int ret;
     V9fsString fullname;
     char buffer[PATH_MAX];
+
     v9fs_string_init(&fullname);
 
     v9fs_string_sprintf(&fullname, "%s/%s", dir->data, name);
+    if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+        if (flags == AT_REMOVEDIR) {
+            /*
+             * If directory remove .virtfs_metadata contained in the
+             * directory
+             */
+            sprintf(buffer, "%s/%s/%s", ctx->fs_root,
+                    fullname.data, VIRTFS_META_DIR);
+            ret = remove(buffer);
+            if (ret < 0 && errno != ENOENT) {
+                /*
+                 * We didn't had the .virtfs_metadata file. May be file created
+                 * in non-mapped mode ?. Ignore ENOENT.
+                 */
+                goto err_out;
+            }
+        }
+        /*
+         * Now remove the name from parent directory
+         * .virtfs_metadata directory.
+         */
+        ret = remove(local_mapped_attr_path(ctx, fullname.data, buffer));
+        if (ret < 0 && errno != ENOENT) {
+            /*
+             * We didn't had the .virtfs_metadata file. May be file created
+             * in non-mapped mode ?. Ignore ENOENT.
+             */
+            goto err_out;
+        }
+    }
+    /* Remove the name finally */
     ret = remove(rpath(ctx, fullname.data, buffer));
     v9fs_string_free(&fullname);
 
+err_out:
     return ret;
 }
 
@@ -736,6 +1061,19 @@ static int local_init(FsContext *ctx)
     int err = 0;
     struct statfs stbuf;
 
+    if (ctx->export_flags & V9FS_SM_PASSTHROUGH) {
+        ctx->xops = passthrough_xattr_ops;
+    } else if (ctx->export_flags & V9FS_SM_MAPPED) {
+        ctx->xops = mapped_xattr_ops;
+    } else if (ctx->export_flags & V9FS_SM_NONE) {
+        ctx->xops = none_xattr_ops;
+    } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+        /*
+         * xattr operation for mapped-file and passthrough
+         * remain same.
+         */
+        ctx->xops = passthrough_xattr_ops;
+    }
     ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
 #ifdef FS_IOC_GETVERSION
     /*
@@ -770,13 +1108,17 @@ static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
 
     if (!strcmp(sec_model, "passthrough")) {
         fse->export_flags |= V9FS_SM_PASSTHROUGH;
-    } else if (!strcmp(sec_model, "mapped")) {
+    } else if (!strcmp(sec_model, "mapped") ||
+               !strcmp(sec_model, "mapped-xattr")) {
         fse->export_flags |= V9FS_SM_MAPPED;
     } else if (!strcmp(sec_model, "none")) {
         fse->export_flags |= V9FS_SM_NONE;
+    } else if (!strcmp(sec_model, "mapped-file")) {
+        fse->export_flags |= V9FS_SM_MAPPED_FILE;
     } else {
         fprintf(stderr, "Invalid security model %s specified, valid options are"
-                "\n\t [passthrough|mapped|none]\n", sec_model);
+                "\n\t [passthrough|mapped-xattr|mapped-file|none]\n",
+                sec_model);
         return -1;
     }