Put ssh back into the repository
Change-Id: I23324372188fa6ed3f93a32b84365f5df6367590
diff --git a/sftp-server.c b/sftp-server.c
new file mode 100644
index 0000000..9d01c7d
--- /dev/null
+++ b/sftp-server.c
@@ -0,0 +1,1548 @@
+/* $OpenBSD: sftp-server.c,v 1.94 2011/06/17 21:46:16 djm Exp $ */
+/*
+ * Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h>
+#endif
+#ifdef HAVE_SYS_MOUNT_H
+#include <sys/mount.h>
+#endif
+#ifdef HAVE_SYS_STATVFS_H
+#include <sys/statvfs.h>
+#endif
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <pwd.h>
+#include <time.h>
+#include <unistd.h>
+#include <stdarg.h>
+
+#include "xmalloc.h"
+#include "buffer.h"
+#include "log.h"
+#include "misc.h"
+#include "uidswap.h"
+
+#include "sftp.h"
+#include "sftp-common.h"
+
+/* helper */
+#define get_int64() buffer_get_int64(&iqueue);
+#define get_int() buffer_get_int(&iqueue);
+#define get_string(lenp) buffer_get_string(&iqueue, lenp);
+
+/* Our verbosity */
+LogLevel log_level = SYSLOG_LEVEL_ERROR;
+
+/* Our client */
+struct passwd *pw = NULL;
+char *client_addr = NULL;
+
+/* input and output queue */
+Buffer iqueue;
+Buffer oqueue;
+
+/* Version of client */
+u_int version;
+
+/* Disable writes */
+int readonly;
+
+/* portable attributes, etc. */
+
+typedef struct Stat Stat;
+
+struct Stat {
+ char *name;
+ char *long_name;
+ Attrib attrib;
+};
+
+static int
+errno_to_portable(int unixerrno)
+{
+ int ret = 0;
+
+ switch (unixerrno) {
+ case 0:
+ ret = SSH2_FX_OK;
+ break;
+ case ENOENT:
+ case ENOTDIR:
+ case EBADF:
+ case ELOOP:
+ ret = SSH2_FX_NO_SUCH_FILE;
+ break;
+ case EPERM:
+ case EACCES:
+ case EFAULT:
+ ret = SSH2_FX_PERMISSION_DENIED;
+ break;
+ case ENAMETOOLONG:
+ case EINVAL:
+ ret = SSH2_FX_BAD_MESSAGE;
+ break;
+ case ENOSYS:
+ ret = SSH2_FX_OP_UNSUPPORTED;
+ break;
+ default:
+ ret = SSH2_FX_FAILURE;
+ break;
+ }
+ return ret;
+}
+
+static int
+flags_from_portable(int pflags)
+{
+ int flags = 0;
+
+ if ((pflags & SSH2_FXF_READ) &&
+ (pflags & SSH2_FXF_WRITE)) {
+ flags = O_RDWR;
+ } else if (pflags & SSH2_FXF_READ) {
+ flags = O_RDONLY;
+ } else if (pflags & SSH2_FXF_WRITE) {
+ flags = O_WRONLY;
+ }
+ if (pflags & SSH2_FXF_CREAT)
+ flags |= O_CREAT;
+ if (pflags & SSH2_FXF_TRUNC)
+ flags |= O_TRUNC;
+ if (pflags & SSH2_FXF_EXCL)
+ flags |= O_EXCL;
+ return flags;
+}
+
+static const char *
+string_from_portable(int pflags)
+{
+ static char ret[128];
+
+ *ret = '\0';
+
+#define PAPPEND(str) { \
+ if (*ret != '\0') \
+ strlcat(ret, ",", sizeof(ret)); \
+ strlcat(ret, str, sizeof(ret)); \
+ }
+
+ if (pflags & SSH2_FXF_READ)
+ PAPPEND("READ")
+ if (pflags & SSH2_FXF_WRITE)
+ PAPPEND("WRITE")
+ if (pflags & SSH2_FXF_CREAT)
+ PAPPEND("CREATE")
+ if (pflags & SSH2_FXF_TRUNC)
+ PAPPEND("TRUNCATE")
+ if (pflags & SSH2_FXF_EXCL)
+ PAPPEND("EXCL")
+
+ return ret;
+}
+
+static Attrib *
+get_attrib(void)
+{
+ return decode_attrib(&iqueue);
+}
+
+/* handle handles */
+
+typedef struct Handle Handle;
+struct Handle {
+ int use;
+ DIR *dirp;
+ int fd;
+ char *name;
+ u_int64_t bytes_read, bytes_write;
+ int next_unused;
+};
+
+enum {
+ HANDLE_UNUSED,
+ HANDLE_DIR,
+ HANDLE_FILE
+};
+
+Handle *handles = NULL;
+u_int num_handles = 0;
+int first_unused_handle = -1;
+
+static void handle_unused(int i)
+{
+ handles[i].use = HANDLE_UNUSED;
+ handles[i].next_unused = first_unused_handle;
+ first_unused_handle = i;
+}
+
+static int
+handle_new(int use, const char *name, int fd, DIR *dirp)
+{
+ int i;
+
+ if (first_unused_handle == -1) {
+ if (num_handles + 1 <= num_handles)
+ return -1;
+ num_handles++;
+ handles = xrealloc(handles, num_handles, sizeof(Handle));
+ handle_unused(num_handles - 1);
+ }
+
+ i = first_unused_handle;
+ first_unused_handle = handles[i].next_unused;
+
+ handles[i].use = use;
+ handles[i].dirp = dirp;
+ handles[i].fd = fd;
+ handles[i].name = xstrdup(name);
+ handles[i].bytes_read = handles[i].bytes_write = 0;
+
+ return i;
+}
+
+static int
+handle_is_ok(int i, int type)
+{
+ return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
+}
+
+static int
+handle_to_string(int handle, char **stringp, int *hlenp)
+{
+ if (stringp == NULL || hlenp == NULL)
+ return -1;
+ *stringp = xmalloc(sizeof(int32_t));
+ put_u32(*stringp, handle);
+ *hlenp = sizeof(int32_t);
+ return 0;
+}
+
+static int
+handle_from_string(const char *handle, u_int hlen)
+{
+ int val;
+
+ if (hlen != sizeof(int32_t))
+ return -1;
+ val = get_u32(handle);
+ if (handle_is_ok(val, HANDLE_FILE) ||
+ handle_is_ok(val, HANDLE_DIR))
+ return val;
+ return -1;
+}
+
+static char *
+handle_to_name(int handle)
+{
+ if (handle_is_ok(handle, HANDLE_DIR)||
+ handle_is_ok(handle, HANDLE_FILE))
+ return handles[handle].name;
+ return NULL;
+}
+
+static DIR *
+handle_to_dir(int handle)
+{
+ if (handle_is_ok(handle, HANDLE_DIR))
+ return handles[handle].dirp;
+ return NULL;
+}
+
+static int
+handle_to_fd(int handle)
+{
+ if (handle_is_ok(handle, HANDLE_FILE))
+ return handles[handle].fd;
+ return -1;
+}
+
+static void
+handle_update_read(int handle, ssize_t bytes)
+{
+ if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
+ handles[handle].bytes_read += bytes;
+}
+
+static void
+handle_update_write(int handle, ssize_t bytes)
+{
+ if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
+ handles[handle].bytes_write += bytes;
+}
+
+static u_int64_t
+handle_bytes_read(int handle)
+{
+ if (handle_is_ok(handle, HANDLE_FILE))
+ return (handles[handle].bytes_read);
+ return 0;
+}
+
+static u_int64_t
+handle_bytes_write(int handle)
+{
+ if (handle_is_ok(handle, HANDLE_FILE))
+ return (handles[handle].bytes_write);
+ return 0;
+}
+
+static int
+handle_close(int handle)
+{
+ int ret = -1;
+
+ if (handle_is_ok(handle, HANDLE_FILE)) {
+ ret = close(handles[handle].fd);
+ xfree(handles[handle].name);
+ handle_unused(handle);
+ } else if (handle_is_ok(handle, HANDLE_DIR)) {
+ ret = closedir(handles[handle].dirp);
+ xfree(handles[handle].name);
+ handle_unused(handle);
+ } else {
+ errno = ENOENT;
+ }
+ return ret;
+}
+
+static void
+handle_log_close(int handle, char *emsg)
+{
+ if (handle_is_ok(handle, HANDLE_FILE)) {
+ logit("%s%sclose \"%s\" bytes read %llu written %llu",
+ emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
+ handle_to_name(handle),
+ (unsigned long long)handle_bytes_read(handle),
+ (unsigned long long)handle_bytes_write(handle));
+ } else {
+ logit("%s%sclosedir \"%s\"",
+ emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
+ handle_to_name(handle));
+ }
+}
+
+static void
+handle_log_exit(void)
+{
+ u_int i;
+
+ for (i = 0; i < num_handles; i++)
+ if (handles[i].use != HANDLE_UNUSED)
+ handle_log_close(i, "forced");
+}
+
+static int
+get_handle(void)
+{
+ char *handle;
+ int val = -1;
+ u_int hlen;
+
+ handle = get_string(&hlen);
+ if (hlen < 256)
+ val = handle_from_string(handle, hlen);
+ xfree(handle);
+ return val;
+}
+
+/* send replies */
+
+static void
+send_msg(Buffer *m)
+{
+ int mlen = buffer_len(m);
+
+ buffer_put_int(&oqueue, mlen);
+ buffer_append(&oqueue, buffer_ptr(m), mlen);
+ buffer_consume(m, mlen);
+}
+
+static const char *
+status_to_message(u_int32_t status)
+{
+ const char *status_messages[] = {
+ "Success", /* SSH_FX_OK */
+ "End of file", /* SSH_FX_EOF */
+ "No such file", /* SSH_FX_NO_SUCH_FILE */
+ "Permission denied", /* SSH_FX_PERMISSION_DENIED */
+ "Failure", /* SSH_FX_FAILURE */
+ "Bad message", /* SSH_FX_BAD_MESSAGE */
+ "No connection", /* SSH_FX_NO_CONNECTION */
+ "Connection lost", /* SSH_FX_CONNECTION_LOST */
+ "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
+ "Unknown error" /* Others */
+ };
+ return (status_messages[MIN(status,SSH2_FX_MAX)]);
+}
+
+static void
+send_status(u_int32_t id, u_int32_t status)
+{
+ Buffer msg;
+
+ debug3("request %u: sent status %u", id, status);
+ if (log_level > SYSLOG_LEVEL_VERBOSE ||
+ (status != SSH2_FX_OK && status != SSH2_FX_EOF))
+ logit("sent status %s", status_to_message(status));
+ buffer_init(&msg);
+ buffer_put_char(&msg, SSH2_FXP_STATUS);
+ buffer_put_int(&msg, id);
+ buffer_put_int(&msg, status);
+ if (version >= 3) {
+ buffer_put_cstring(&msg, status_to_message(status));
+ buffer_put_cstring(&msg, "");
+ }
+ send_msg(&msg);
+ buffer_free(&msg);
+}
+static void
+send_data_or_handle(char type, u_int32_t id, const char *data, int dlen)
+{
+ Buffer msg;
+
+ buffer_init(&msg);
+ buffer_put_char(&msg, type);
+ buffer_put_int(&msg, id);
+ buffer_put_string(&msg, data, dlen);
+ send_msg(&msg);
+ buffer_free(&msg);
+}
+
+static void
+send_data(u_int32_t id, const char *data, int dlen)
+{
+ debug("request %u: sent data len %d", id, dlen);
+ send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
+}
+
+static void
+send_handle(u_int32_t id, int handle)
+{
+ char *string;
+ int hlen;
+
+ handle_to_string(handle, &string, &hlen);
+ debug("request %u: sent handle handle %d", id, handle);
+ send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
+ xfree(string);
+}
+
+static void
+send_names(u_int32_t id, int count, const Stat *stats)
+{
+ Buffer msg;
+ int i;
+
+ buffer_init(&msg);
+ buffer_put_char(&msg, SSH2_FXP_NAME);
+ buffer_put_int(&msg, id);
+ buffer_put_int(&msg, count);
+ debug("request %u: sent names count %d", id, count);
+ for (i = 0; i < count; i++) {
+ buffer_put_cstring(&msg, stats[i].name);
+ buffer_put_cstring(&msg, stats[i].long_name);
+ encode_attrib(&msg, &stats[i].attrib);
+ }
+ send_msg(&msg);
+ buffer_free(&msg);
+}
+
+static void
+send_attrib(u_int32_t id, const Attrib *a)
+{
+ Buffer msg;
+
+ debug("request %u: sent attrib have 0x%x", id, a->flags);
+ buffer_init(&msg);
+ buffer_put_char(&msg, SSH2_FXP_ATTRS);
+ buffer_put_int(&msg, id);
+ encode_attrib(&msg, a);
+ send_msg(&msg);
+ buffer_free(&msg);
+}
+
+static void
+send_statvfs(u_int32_t id, struct statvfs *st)
+{
+ Buffer msg;
+ u_int64_t flag;
+
+ flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
+ flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
+
+ buffer_init(&msg);
+ buffer_put_char(&msg, SSH2_FXP_EXTENDED_REPLY);
+ buffer_put_int(&msg, id);
+ buffer_put_int64(&msg, st->f_bsize);
+ buffer_put_int64(&msg, st->f_frsize);
+ buffer_put_int64(&msg, st->f_blocks);
+ buffer_put_int64(&msg, st->f_bfree);
+ buffer_put_int64(&msg, st->f_bavail);
+ buffer_put_int64(&msg, st->f_files);
+ buffer_put_int64(&msg, st->f_ffree);
+ buffer_put_int64(&msg, st->f_favail);
+ buffer_put_int64(&msg, FSID_TO_ULONG(st->f_fsid));
+ buffer_put_int64(&msg, flag);
+ buffer_put_int64(&msg, st->f_namemax);
+ send_msg(&msg);
+ buffer_free(&msg);
+}
+
+/* parse incoming */
+
+static void
+process_init(void)
+{
+ Buffer msg;
+
+ version = get_int();
+ verbose("received client version %u", version);
+ buffer_init(&msg);
+ buffer_put_char(&msg, SSH2_FXP_VERSION);
+ buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
+ /* POSIX rename extension */
+ buffer_put_cstring(&msg, "posix-rename@openssh.com");
+ buffer_put_cstring(&msg, "1"); /* version */
+ /* statvfs extension */
+ buffer_put_cstring(&msg, "statvfs@openssh.com");
+ buffer_put_cstring(&msg, "2"); /* version */
+ /* fstatvfs extension */
+ buffer_put_cstring(&msg, "fstatvfs@openssh.com");
+ buffer_put_cstring(&msg, "2"); /* version */
+ /* hardlink extension */
+ buffer_put_cstring(&msg, "hardlink@openssh.com");
+ buffer_put_cstring(&msg, "1"); /* version */
+ send_msg(&msg);
+ buffer_free(&msg);
+}
+
+static void
+process_open(void)
+{
+ u_int32_t id, pflags;
+ Attrib *a;
+ char *name;
+ int handle, fd, flags, mode, status = SSH2_FX_FAILURE;
+
+ id = get_int();
+ name = get_string(NULL);
+ pflags = get_int(); /* portable flags */
+ debug3("request %u: open flags %d", id, pflags);
+ a = get_attrib();
+ flags = flags_from_portable(pflags);
+ mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666;
+ logit("open \"%s\" flags %s mode 0%o",
+ name, string_from_portable(pflags), mode);
+ if (readonly &&
+ ((flags & O_ACCMODE) == O_WRONLY || (flags & O_ACCMODE) == O_RDWR))
+ status = SSH2_FX_PERMISSION_DENIED;
+ else {
+ fd = open(name, flags, mode);
+ if (fd < 0) {
+ status = errno_to_portable(errno);
+ } else {
+ handle = handle_new(HANDLE_FILE, name, fd, NULL);
+ if (handle < 0) {
+ close(fd);
+ } else {
+ send_handle(id, handle);
+ status = SSH2_FX_OK;
+ }
+ }
+ }
+ if (status != SSH2_FX_OK)
+ send_status(id, status);
+ xfree(name);
+}
+
+static void
+process_close(void)
+{
+ u_int32_t id;
+ int handle, ret, status = SSH2_FX_FAILURE;
+
+ id = get_int();
+ handle = get_handle();
+ debug3("request %u: close handle %u", id, handle);
+ handle_log_close(handle, NULL);
+ ret = handle_close(handle);
+ status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ send_status(id, status);
+}
+
+static void
+process_read(void)
+{
+ char buf[64*1024];
+ u_int32_t id, len;
+ int handle, fd, ret, status = SSH2_FX_FAILURE;
+ u_int64_t off;
+
+ id = get_int();
+ handle = get_handle();
+ off = get_int64();
+ len = get_int();
+
+ debug("request %u: read \"%s\" (handle %d) off %llu len %d",
+ id, handle_to_name(handle), handle, (unsigned long long)off, len);
+ if (len > sizeof buf) {
+ len = sizeof buf;
+ debug2("read change len %d", len);
+ }
+ fd = handle_to_fd(handle);
+ if (fd >= 0) {
+ if (lseek(fd, off, SEEK_SET) < 0) {
+ error("process_read: seek failed");
+ status = errno_to_portable(errno);
+ } else {
+ ret = read(fd, buf, len);
+ if (ret < 0) {
+ status = errno_to_portable(errno);
+ } else if (ret == 0) {
+ status = SSH2_FX_EOF;
+ } else {
+ send_data(id, buf, ret);
+ status = SSH2_FX_OK;
+ handle_update_read(handle, ret);
+ }
+ }
+ }
+ if (status != SSH2_FX_OK)
+ send_status(id, status);
+}
+
+static void
+process_write(void)
+{
+ u_int32_t id;
+ u_int64_t off;
+ u_int len;
+ int handle, fd, ret, status;
+ char *data;
+
+ id = get_int();
+ handle = get_handle();
+ off = get_int64();
+ data = get_string(&len);
+
+ debug("request %u: write \"%s\" (handle %d) off %llu len %d",
+ id, handle_to_name(handle), handle, (unsigned long long)off, len);
+ fd = handle_to_fd(handle);
+
+ if (fd < 0)
+ status = SSH2_FX_FAILURE;
+ else if (readonly)
+ status = SSH2_FX_PERMISSION_DENIED;
+ else {
+ if (lseek(fd, off, SEEK_SET) < 0) {
+ status = errno_to_portable(errno);
+ error("process_write: seek failed");
+ } else {
+/* XXX ATOMICIO ? */
+ ret = write(fd, data, len);
+ if (ret < 0) {
+ error("process_write: write failed");
+ status = errno_to_portable(errno);
+ } else if ((size_t)ret == len) {
+ status = SSH2_FX_OK;
+ handle_update_write(handle, ret);
+ } else {
+ debug2("nothing at all written");
+ status = SSH2_FX_FAILURE;
+ }
+ }
+ }
+ send_status(id, status);
+ xfree(data);
+}
+
+static void
+process_do_stat(int do_lstat)
+{
+ Attrib a;
+ struct stat st;
+ u_int32_t id;
+ char *name;
+ int ret, status = SSH2_FX_FAILURE;
+
+ id = get_int();
+ name = get_string(NULL);
+ debug3("request %u: %sstat", id, do_lstat ? "l" : "");
+ verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
+ ret = do_lstat ? lstat(name, &st) : stat(name, &st);
+ if (ret < 0) {
+ status = errno_to_portable(errno);
+ } else {
+ stat_to_attrib(&st, &a);
+ send_attrib(id, &a);
+ status = SSH2_FX_OK;
+ }
+ if (status != SSH2_FX_OK)
+ send_status(id, status);
+ xfree(name);
+}
+
+static void
+process_stat(void)
+{
+ process_do_stat(0);
+}
+
+static void
+process_lstat(void)
+{
+ process_do_stat(1);
+}
+
+static void
+process_fstat(void)
+{
+ Attrib a;
+ struct stat st;
+ u_int32_t id;
+ int fd, ret, handle, status = SSH2_FX_FAILURE;
+
+ id = get_int();
+ handle = get_handle();
+ debug("request %u: fstat \"%s\" (handle %u)",
+ id, handle_to_name(handle), handle);
+ fd = handle_to_fd(handle);
+ if (fd >= 0) {
+ ret = fstat(fd, &st);
+ if (ret < 0) {
+ status = errno_to_portable(errno);
+ } else {
+ stat_to_attrib(&st, &a);
+ send_attrib(id, &a);
+ status = SSH2_FX_OK;
+ }
+ }
+ if (status != SSH2_FX_OK)
+ send_status(id, status);
+}
+
+static struct timeval *
+attrib_to_tv(const Attrib *a)
+{
+ static struct timeval tv[2];
+
+ tv[0].tv_sec = a->atime;
+ tv[0].tv_usec = 0;
+ tv[1].tv_sec = a->mtime;
+ tv[1].tv_usec = 0;
+ return tv;
+}
+
+static void
+process_setstat(void)
+{
+ Attrib *a;
+ u_int32_t id;
+ char *name;
+ int status = SSH2_FX_OK, ret;
+
+ id = get_int();
+ name = get_string(NULL);
+ a = get_attrib();
+ debug("request %u: setstat name \"%s\"", id, name);
+ if (readonly) {
+ status = SSH2_FX_PERMISSION_DENIED;
+ a->flags = 0;
+ }
+ if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
+ logit("set \"%s\" size %llu",
+ name, (unsigned long long)a->size);
+ ret = truncate(name, a->size);
+ if (ret == -1)
+ status = errno_to_portable(errno);
+ }
+ if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
+ logit("set \"%s\" mode %04o", name, a->perm);
+ ret = chmod(name, a->perm & 07777);
+ if (ret == -1)
+ status = errno_to_portable(errno);
+ }
+ if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
+ char buf[64];
+ time_t t = a->mtime;
+
+ strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
+ localtime(&t));
+ logit("set \"%s\" modtime %s", name, buf);
+ ret = utimes(name, attrib_to_tv(a));
+ if (ret == -1)
+ status = errno_to_portable(errno);
+ }
+ if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
+ logit("set \"%s\" owner %lu group %lu", name,
+ (u_long)a->uid, (u_long)a->gid);
+ ret = chown(name, a->uid, a->gid);
+ if (ret == -1)
+ status = errno_to_portable(errno);
+ }
+ send_status(id, status);
+ xfree(name);
+}
+
+static void
+process_fsetstat(void)
+{
+ Attrib *a;
+ u_int32_t id;
+ int handle, fd, ret;
+ int status = SSH2_FX_OK;
+
+ id = get_int();
+ handle = get_handle();
+ a = get_attrib();
+ debug("request %u: fsetstat handle %d", id, handle);
+ fd = handle_to_fd(handle);
+ if (fd < 0)
+ status = SSH2_FX_FAILURE;
+ else if (readonly)
+ status = SSH2_FX_PERMISSION_DENIED;
+ else {
+ char *name = handle_to_name(handle);
+
+ if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
+ logit("set \"%s\" size %llu",
+ name, (unsigned long long)a->size);
+ ret = ftruncate(fd, a->size);
+ if (ret == -1)
+ status = errno_to_portable(errno);
+ }
+ if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
+ logit("set \"%s\" mode %04o", name, a->perm);
+#ifdef HAVE_FCHMOD
+ ret = fchmod(fd, a->perm & 07777);
+#else
+ ret = chmod(name, a->perm & 07777);
+#endif
+ if (ret == -1)
+ status = errno_to_portable(errno);
+ }
+ if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
+ char buf[64];
+ time_t t = a->mtime;
+
+ strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
+ localtime(&t));
+ logit("set \"%s\" modtime %s", name, buf);
+#ifdef HAVE_FUTIMES
+ ret = futimes(fd, attrib_to_tv(a));
+#else
+ ret = utimes(name, attrib_to_tv(a));
+#endif
+ if (ret == -1)
+ status = errno_to_portable(errno);
+ }
+ if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
+ logit("set \"%s\" owner %lu group %lu", name,
+ (u_long)a->uid, (u_long)a->gid);
+#ifdef HAVE_FCHOWN
+ ret = fchown(fd, a->uid, a->gid);
+#else
+ ret = chown(name, a->uid, a->gid);
+#endif
+ if (ret == -1)
+ status = errno_to_portable(errno);
+ }
+ }
+ send_status(id, status);
+}
+
+static void
+process_opendir(void)
+{
+ DIR *dirp = NULL;
+ char *path;
+ int handle, status = SSH2_FX_FAILURE;
+ u_int32_t id;
+
+ id = get_int();
+ path = get_string(NULL);
+ debug3("request %u: opendir", id);
+ logit("opendir \"%s\"", path);
+ dirp = opendir(path);
+ if (dirp == NULL) {
+ status = errno_to_portable(errno);
+ } else {
+ handle = handle_new(HANDLE_DIR, path, 0, dirp);
+ if (handle < 0) {
+ closedir(dirp);
+ } else {
+ send_handle(id, handle);
+ status = SSH2_FX_OK;
+ }
+
+ }
+ if (status != SSH2_FX_OK)
+ send_status(id, status);
+ xfree(path);
+}
+
+static void
+process_readdir(void)
+{
+ DIR *dirp;
+ struct dirent *dp;
+ char *path;
+ int handle;
+ u_int32_t id;
+
+ id = get_int();
+ handle = get_handle();
+ debug("request %u: readdir \"%s\" (handle %d)", id,
+ handle_to_name(handle), handle);
+ dirp = handle_to_dir(handle);
+ path = handle_to_name(handle);
+ if (dirp == NULL || path == NULL) {
+ send_status(id, SSH2_FX_FAILURE);
+ } else {
+ struct stat st;
+ char pathname[MAXPATHLEN];
+ Stat *stats;
+ int nstats = 10, count = 0, i;
+
+ stats = xcalloc(nstats, sizeof(Stat));
+ while ((dp = readdir(dirp)) != NULL) {
+ if (count >= nstats) {
+ nstats *= 2;
+ stats = xrealloc(stats, nstats, sizeof(Stat));
+ }
+/* XXX OVERFLOW ? */
+ snprintf(pathname, sizeof pathname, "%s%s%s", path,
+ strcmp(path, "/") ? "/" : "", dp->d_name);
+ if (lstat(pathname, &st) < 0)
+ continue;
+ stat_to_attrib(&st, &(stats[count].attrib));
+ stats[count].name = xstrdup(dp->d_name);
+ stats[count].long_name = ls_file(dp->d_name, &st, 0, 0);
+ count++;
+ /* send up to 100 entries in one message */
+ /* XXX check packet size instead */
+ if (count == 100)
+ break;
+ }
+ if (count > 0) {
+ send_names(id, count, stats);
+ for (i = 0; i < count; i++) {
+ xfree(stats[i].name);
+ xfree(stats[i].long_name);
+ }
+ } else {
+ send_status(id, SSH2_FX_EOF);
+ }
+ xfree(stats);
+ }
+}
+
+static void
+process_remove(void)
+{
+ char *name;
+ u_int32_t id;
+ int status = SSH2_FX_FAILURE;
+ int ret;
+
+ id = get_int();
+ name = get_string(NULL);
+ debug3("request %u: remove", id);
+ logit("remove name \"%s\"", name);
+ if (readonly)
+ status = SSH2_FX_PERMISSION_DENIED;
+ else {
+ ret = unlink(name);
+ status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ }
+ send_status(id, status);
+ xfree(name);
+}
+
+static void
+process_mkdir(void)
+{
+ Attrib *a;
+ u_int32_t id;
+ char *name;
+ int ret, mode, status = SSH2_FX_FAILURE;
+
+ id = get_int();
+ name = get_string(NULL);
+ a = get_attrib();
+ mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
+ a->perm & 07777 : 0777;
+ debug3("request %u: mkdir", id);
+ logit("mkdir name \"%s\" mode 0%o", name, mode);
+ if (readonly)
+ status = SSH2_FX_PERMISSION_DENIED;
+ else {
+ ret = mkdir(name, mode);
+ status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ }
+ send_status(id, status);
+ xfree(name);
+}
+
+static void
+process_rmdir(void)
+{
+ u_int32_t id;
+ char *name;
+ int ret, status;
+
+ id = get_int();
+ name = get_string(NULL);
+ debug3("request %u: rmdir", id);
+ logit("rmdir name \"%s\"", name);
+ if (readonly)
+ status = SSH2_FX_PERMISSION_DENIED;
+ else {
+ ret = rmdir(name);
+ status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ }
+ send_status(id, status);
+ xfree(name);
+}
+
+static void
+process_realpath(void)
+{
+ char resolvedname[MAXPATHLEN];
+ u_int32_t id;
+ char *path;
+
+ id = get_int();
+ path = get_string(NULL);
+ if (path[0] == '\0') {
+ xfree(path);
+ path = xstrdup(".");
+ }
+ debug3("request %u: realpath", id);
+ verbose("realpath \"%s\"", path);
+ if (realpath(path, resolvedname) == NULL) {
+ send_status(id, errno_to_portable(errno));
+ } else {
+ Stat s;
+ attrib_clear(&s.attrib);
+ s.name = s.long_name = resolvedname;
+ send_names(id, 1, &s);
+ }
+ xfree(path);
+}
+
+static void
+process_rename(void)
+{
+ u_int32_t id;
+ char *oldpath, *newpath;
+ int status;
+ struct stat sb;
+
+ id = get_int();
+ oldpath = get_string(NULL);
+ newpath = get_string(NULL);
+ debug3("request %u: rename", id);
+ logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
+ status = SSH2_FX_FAILURE;
+ if (readonly)
+ status = SSH2_FX_PERMISSION_DENIED;
+ else if (lstat(oldpath, &sb) == -1)
+ status = errno_to_portable(errno);
+ else if (S_ISREG(sb.st_mode)) {
+ /* Race-free rename of regular files */
+ if (link(oldpath, newpath) == -1) {
+ if (errno == EOPNOTSUPP || errno == ENOSYS
+#ifdef EXDEV
+ || errno == EXDEV
+#endif
+#ifdef LINK_OPNOTSUPP_ERRNO
+ || errno == LINK_OPNOTSUPP_ERRNO
+#endif
+ ) {
+ struct stat st;
+
+ /*
+ * fs doesn't support links, so fall back to
+ * stat+rename. This is racy.
+ */
+ if (stat(newpath, &st) == -1) {
+ if (rename(oldpath, newpath) == -1)
+ status =
+ errno_to_portable(errno);
+ else
+ status = SSH2_FX_OK;
+ }
+ } else {
+ status = errno_to_portable(errno);
+ }
+ } else if (unlink(oldpath) == -1) {
+ status = errno_to_portable(errno);
+ /* clean spare link */
+ unlink(newpath);
+ } else
+ status = SSH2_FX_OK;
+ } else if (stat(newpath, &sb) == -1) {
+ if (rename(oldpath, newpath) == -1)
+ status = errno_to_portable(errno);
+ else
+ status = SSH2_FX_OK;
+ }
+ send_status(id, status);
+ xfree(oldpath);
+ xfree(newpath);
+}
+
+static void
+process_readlink(void)
+{
+ u_int32_t id;
+ int len;
+ char buf[MAXPATHLEN];
+ char *path;
+
+ id = get_int();
+ path = get_string(NULL);
+ debug3("request %u: readlink", id);
+ verbose("readlink \"%s\"", path);
+ if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
+ send_status(id, errno_to_portable(errno));
+ else {
+ Stat s;
+
+ buf[len] = '\0';
+ attrib_clear(&s.attrib);
+ s.name = s.long_name = buf;
+ send_names(id, 1, &s);
+ }
+ xfree(path);
+}
+
+static void
+process_symlink(void)
+{
+ u_int32_t id;
+ char *oldpath, *newpath;
+ int ret, status;
+
+ id = get_int();
+ oldpath = get_string(NULL);
+ newpath = get_string(NULL);
+ debug3("request %u: symlink", id);
+ logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
+ /* this will fail if 'newpath' exists */
+ if (readonly)
+ status = SSH2_FX_PERMISSION_DENIED;
+ else {
+ ret = symlink(oldpath, newpath);
+ status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ }
+ send_status(id, status);
+ xfree(oldpath);
+ xfree(newpath);
+}
+
+static void
+process_extended_posix_rename(u_int32_t id)
+{
+ char *oldpath, *newpath;
+ int ret, status;
+
+ oldpath = get_string(NULL);
+ newpath = get_string(NULL);
+ debug3("request %u: posix-rename", id);
+ logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
+ if (readonly)
+ status = SSH2_FX_PERMISSION_DENIED;
+ else {
+ ret = rename(oldpath, newpath);
+ status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ }
+ send_status(id, status);
+ xfree(oldpath);
+ xfree(newpath);
+}
+
+static void
+process_extended_statvfs(u_int32_t id)
+{
+ char *path;
+ struct statvfs st;
+
+ path = get_string(NULL);
+ debug3("request %u: statfs", id);
+ logit("statfs \"%s\"", path);
+
+ if (statvfs(path, &st) != 0)
+ send_status(id, errno_to_portable(errno));
+ else
+ send_statvfs(id, &st);
+ xfree(path);
+}
+
+static void
+process_extended_fstatvfs(u_int32_t id)
+{
+ int handle, fd;
+ struct statvfs st;
+
+ handle = get_handle();
+ debug("request %u: fstatvfs \"%s\" (handle %u)",
+ id, handle_to_name(handle), handle);
+ if ((fd = handle_to_fd(handle)) < 0) {
+ send_status(id, SSH2_FX_FAILURE);
+ return;
+ }
+ if (fstatvfs(fd, &st) != 0)
+ send_status(id, errno_to_portable(errno));
+ else
+ send_statvfs(id, &st);
+}
+
+static void
+process_extended_hardlink(u_int32_t id)
+{
+ char *oldpath, *newpath;
+ int ret, status;
+
+ oldpath = get_string(NULL);
+ newpath = get_string(NULL);
+ debug3("request %u: hardlink", id);
+ logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
+ if (readonly)
+ status = SSH2_FX_PERMISSION_DENIED;
+ else {
+ ret = link(oldpath, newpath);
+ status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ }
+ send_status(id, status);
+ xfree(oldpath);
+ xfree(newpath);
+}
+
+static void
+process_extended(void)
+{
+ u_int32_t id;
+ char *request;
+
+ id = get_int();
+ request = get_string(NULL);
+ if (strcmp(request, "posix-rename@openssh.com") == 0)
+ process_extended_posix_rename(id);
+ else if (strcmp(request, "statvfs@openssh.com") == 0)
+ process_extended_statvfs(id);
+ else if (strcmp(request, "fstatvfs@openssh.com") == 0)
+ process_extended_fstatvfs(id);
+ else if (strcmp(request, "hardlink@openssh.com") == 0)
+ process_extended_hardlink(id);
+ else
+ send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
+ xfree(request);
+}
+
+/* stolen from ssh-agent */
+
+static void
+process(void)
+{
+ u_int msg_len;
+ u_int buf_len;
+ u_int consumed;
+ u_int type;
+ u_char *cp;
+
+ buf_len = buffer_len(&iqueue);
+ if (buf_len < 5)
+ return; /* Incomplete message. */
+ cp = buffer_ptr(&iqueue);
+ msg_len = get_u32(cp);
+ if (msg_len > SFTP_MAX_MSG_LENGTH) {
+ error("bad message from %s local user %s",
+ client_addr, pw->pw_name);
+ sftp_server_cleanup_exit(11);
+ }
+ if (buf_len < msg_len + 4)
+ return;
+ buffer_consume(&iqueue, 4);
+ buf_len -= 4;
+ type = buffer_get_char(&iqueue);
+ switch (type) {
+ case SSH2_FXP_INIT:
+ process_init();
+ break;
+ case SSH2_FXP_OPEN:
+ process_open();
+ break;
+ case SSH2_FXP_CLOSE:
+ process_close();
+ break;
+ case SSH2_FXP_READ:
+ process_read();
+ break;
+ case SSH2_FXP_WRITE:
+ process_write();
+ break;
+ case SSH2_FXP_LSTAT:
+ process_lstat();
+ break;
+ case SSH2_FXP_FSTAT:
+ process_fstat();
+ break;
+ case SSH2_FXP_SETSTAT:
+ process_setstat();
+ break;
+ case SSH2_FXP_FSETSTAT:
+ process_fsetstat();
+ break;
+ case SSH2_FXP_OPENDIR:
+ process_opendir();
+ break;
+ case SSH2_FXP_READDIR:
+ process_readdir();
+ break;
+ case SSH2_FXP_REMOVE:
+ process_remove();
+ break;
+ case SSH2_FXP_MKDIR:
+ process_mkdir();
+ break;
+ case SSH2_FXP_RMDIR:
+ process_rmdir();
+ break;
+ case SSH2_FXP_REALPATH:
+ process_realpath();
+ break;
+ case SSH2_FXP_STAT:
+ process_stat();
+ break;
+ case SSH2_FXP_RENAME:
+ process_rename();
+ break;
+ case SSH2_FXP_READLINK:
+ process_readlink();
+ break;
+ case SSH2_FXP_SYMLINK:
+ process_symlink();
+ break;
+ case SSH2_FXP_EXTENDED:
+ process_extended();
+ break;
+ default:
+ error("Unknown message %d", type);
+ break;
+ }
+ /* discard the remaining bytes from the current packet */
+ if (buf_len < buffer_len(&iqueue)) {
+ error("iqueue grew unexpectedly");
+ sftp_server_cleanup_exit(255);
+ }
+ consumed = buf_len - buffer_len(&iqueue);
+ if (msg_len < consumed) {
+ error("msg_len %d < consumed %d", msg_len, consumed);
+ sftp_server_cleanup_exit(255);
+ }
+ if (msg_len > consumed)
+ buffer_consume(&iqueue, msg_len - consumed);
+}
+
+/* Cleanup handler that logs active handles upon normal exit */
+void
+sftp_server_cleanup_exit(int i)
+{
+ if (pw != NULL && client_addr != NULL) {
+ handle_log_exit();
+ logit("session closed for local user %s from [%s]",
+ pw->pw_name, client_addr);
+ }
+ _exit(i);
+}
+
+static void
+sftp_server_usage(void)
+{
+ extern char *__progname;
+
+ fprintf(stderr,
+ "usage: %s [-ehR] [-f log_facility] [-l log_level] [-u umask]\n",
+ __progname);
+ exit(1);
+}
+
+int
+sftp_server_main(int argc, char **argv, struct passwd *user_pw)
+{
+ fd_set *rset, *wset;
+ int in, out, max, ch, skipargs = 0, log_stderr = 0;
+ ssize_t len, olen, set_size;
+ SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
+ char *cp, buf[4*4096];
+ long mask;
+
+ extern char *optarg;
+ extern char *__progname;
+
+ __progname = ssh_get_progname(argv[0]);
+ log_init(__progname, log_level, log_facility, log_stderr);
+
+ while (!skipargs && (ch = getopt(argc, argv, "f:l:u:cehR")) != -1) {
+ switch (ch) {
+ case 'R':
+ readonly = 1;
+ break;
+ case 'c':
+ /*
+ * Ignore all arguments if we are invoked as a
+ * shell using "sftp-server -c command"
+ */
+ skipargs = 1;
+ break;
+ case 'e':
+ log_stderr = 1;
+ break;
+ case 'l':
+ log_level = log_level_number(optarg);
+ if (log_level == SYSLOG_LEVEL_NOT_SET)
+ error("Invalid log level \"%s\"", optarg);
+ break;
+ case 'f':
+ log_facility = log_facility_number(optarg);
+ if (log_facility == SYSLOG_FACILITY_NOT_SET)
+ error("Invalid log facility \"%s\"", optarg);
+ break;
+ case 'u':
+ errno = 0;
+ mask = strtol(optarg, &cp, 8);
+ if (mask < 0 || mask > 0777 || *cp != '\0' ||
+ cp == optarg || (mask == 0 && errno != 0))
+ fatal("Invalid umask \"%s\"", optarg);
+ (void)umask((mode_t)mask);
+ break;
+ case 'h':
+ default:
+ sftp_server_usage();
+ }
+ }
+
+ log_init(__progname, log_level, log_facility, log_stderr);
+
+ if ((cp = getenv("SSH_CONNECTION")) != NULL) {
+ client_addr = xstrdup(cp);
+ if ((cp = strchr(client_addr, ' ')) == NULL) {
+ error("Malformed SSH_CONNECTION variable: \"%s\"",
+ getenv("SSH_CONNECTION"));
+ sftp_server_cleanup_exit(255);
+ }
+ *cp = '\0';
+ } else
+ client_addr = xstrdup("UNKNOWN");
+
+ pw = pwcopy(user_pw);
+
+ logit("session opened for local user %s from [%s]",
+ pw->pw_name, client_addr);
+
+ in = STDIN_FILENO;
+ out = STDOUT_FILENO;
+
+#ifdef HAVE_CYGWIN
+ setmode(in, O_BINARY);
+ setmode(out, O_BINARY);
+#endif
+
+ max = 0;
+ if (in > max)
+ max = in;
+ if (out > max)
+ max = out;
+
+ buffer_init(&iqueue);
+ buffer_init(&oqueue);
+
+ set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
+ rset = (fd_set *)xmalloc(set_size);
+ wset = (fd_set *)xmalloc(set_size);
+
+ for (;;) {
+ memset(rset, 0, set_size);
+ memset(wset, 0, set_size);
+
+ /*
+ * Ensure that we can read a full buffer and handle
+ * the worst-case length packet it can generate,
+ * otherwise apply backpressure by stopping reads.
+ */
+ if (buffer_check_alloc(&iqueue, sizeof(buf)) &&
+ buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
+ FD_SET(in, rset);
+
+ olen = buffer_len(&oqueue);
+ if (olen > 0)
+ FD_SET(out, wset);
+
+ if (select(max+1, rset, wset, NULL, NULL) < 0) {
+ if (errno == EINTR)
+ continue;
+ error("select: %s", strerror(errno));
+ sftp_server_cleanup_exit(2);
+ }
+
+ /* copy stdin to iqueue */
+ if (FD_ISSET(in, rset)) {
+ len = read(in, buf, sizeof buf);
+ if (len == 0) {
+ debug("read eof");
+ sftp_server_cleanup_exit(0);
+ } else if (len < 0) {
+ error("read: %s", strerror(errno));
+ sftp_server_cleanup_exit(1);
+ } else {
+ buffer_append(&iqueue, buf, len);
+ }
+ }
+ /* send oqueue to stdout */
+ if (FD_ISSET(out, wset)) {
+ len = write(out, buffer_ptr(&oqueue), olen);
+ if (len < 0) {
+ error("write: %s", strerror(errno));
+ sftp_server_cleanup_exit(1);
+ } else {
+ buffer_consume(&oqueue, len);
+ }
+ }
+
+ /*
+ * Process requests from client if we can fit the results
+ * into the output buffer, otherwise stop processing input
+ * and let the output queue drain.
+ */
+ if (buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
+ process();
+ }
+}