root / hw / virtio-9p-local.c @ a6568fe2
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/*
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* Virtio 9p Posix callback
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "virtio.h" |
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#include "virtio-9p.h" |
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#include <pwd.h> |
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#include <grp.h> |
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static const char *rpath(FsContext *ctx, const char *path) |
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{
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/* FIXME: so wrong... */
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static char buffer[4096]; |
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snprintf(buffer, sizeof(buffer), "%s/%s", ctx->fs_root, path); |
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return buffer;
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} |
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static int local_lstat(FsContext *ctx, const char *path, struct stat *stbuf) |
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{
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return lstat(rpath(ctx, path), stbuf);
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} |
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static int local_setuid(FsContext *ctx, uid_t uid) |
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{
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struct passwd *pw;
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gid_t groups[33];
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int ngroups;
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static uid_t cur_uid = -1; |
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if (cur_uid == uid) {
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return 0; |
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} |
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if (setreuid(0, 0)) { |
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return -1; |
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} |
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pw = getpwuid(uid); |
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if (pw == NULL) { |
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return -1; |
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} |
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ngroups = 33;
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if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) == -1) { |
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return -1; |
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} |
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if (setgroups(ngroups, groups)) {
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return -1; |
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} |
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if (setregid(-1, pw->pw_gid)) { |
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return -1; |
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} |
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if (setreuid(-1, uid)) { |
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return -1; |
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} |
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cur_uid = uid; |
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return 0; |
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} |
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static ssize_t local_readlink(FsContext *ctx, const char *path, |
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char *buf, size_t bufsz)
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{
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return readlink(rpath(ctx, path), buf, bufsz);
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} |
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static int local_close(FsContext *ctx, int fd) |
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{
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return close(fd);
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} |
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static int local_closedir(FsContext *ctx, DIR *dir) |
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{
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return closedir(dir);
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} |
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static int local_open(FsContext *ctx, const char *path, int flags) |
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{
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return open(rpath(ctx, path), flags);
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} |
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static DIR *local_opendir(FsContext *ctx, const char *path) |
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{
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return opendir(rpath(ctx, path));
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} |
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FileOperations local_ops = {
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.lstat = local_lstat, |
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.setuid = local_setuid, |
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.readlink = local_readlink, |
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.close = local_close, |
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.closedir = local_closedir, |
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.open = local_open, |
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.opendir = local_opendir, |
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}; |