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libssh/tests/server/test_server/sftpserver_cb.c
tatataeki 0a5161a7d1 sftp: fix format problems, style nit and building problems 
Signed-off-by: tatataeki <shengzeyu19_98@163.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
2023-06-06 10:54:31 +02:00

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/*
* This file is part of the SSH Library
*
* Copyright (c) 2018 by Red Hat, Inc.
*
* Author: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
*
* The SSH Library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The SSH Library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the SSH Library; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#include "config.h"
#include "test_server.h"
#include "default_cb.h"
#include <libssh/callbacks.h>
#include <libssh/server.h>
#include <libssh/priv.h>
#include <libssh/sftp.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdbool.h>
#include <poll.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#ifdef HAVE_LIBUTIL_H
#include <libutil.h>
#endif
#ifdef HAVE_PTY_H
#include <pty.h>
#endif
#ifdef HAVE_UTMP_H
#include <utmp.h>
#endif
#ifdef HAVE_UTIL_H
#include <util.h>
#endif
/* below are for sftp */
#include <sys/types.h>
#include <sys/statvfs.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <time.h>
#define BUF_SIZE 1048576
#define SESSION_END (SSH_CLOSED | SSH_CLOSED_ERROR)
#define MAX_HANDLE_NUM 10
#define MAX_ENTRIES_NUM_IN_PACKET 50
#define MAX_LONG_NAME_LEN 300
#define SSH_SFTP_CALLBACK(name) \
static int name (sftp_client_message message)
typedef int (*client_message_callback) (sftp_client_message message);
struct message_handler{
const char *name;
const char *extended_name;
u_int type;
client_message_callback cb;
};
struct sftp_handle {
uint8_t type;
int fd;
DIR *dirp;
char *name;
void *session_id;
};
enum handle_type {
NULL_HANDLE,
DIR_HANDLE,
FILE_HANDLE
};
SSH_SFTP_CALLBACK(process_unsupposed);
SSH_SFTP_CALLBACK(process_open);
SSH_SFTP_CALLBACK(process_read);
SSH_SFTP_CALLBACK(process_write);
SSH_SFTP_CALLBACK(process_close);
SSH_SFTP_CALLBACK(process_opendir);
SSH_SFTP_CALLBACK(process_readdir);
SSH_SFTP_CALLBACK(process_rmdir);
SSH_SFTP_CALLBACK(process_mkdir);
SSH_SFTP_CALLBACK(process_lstat);
SSH_SFTP_CALLBACK(process_readlink);
SSH_SFTP_CALLBACK(process_symlink);
SSH_SFTP_CALLBACK(process_remove);
SSH_SFTP_CALLBACK(process_extended_statvfs);
const struct message_handler message_handlers[] = {
{ "open", NULL, SSH_FXP_OPEN, process_open},
{ "close", NULL, SSH_FXP_CLOSE, process_close},
{ "read", NULL, SSH_FXP_READ, process_read},
{ "write", NULL, SSH_FXP_WRITE, process_write},
{ "lstat", NULL, SSH_FXP_LSTAT, process_lstat},
{ "fstat", NULL, SSH_FXP_FSTAT, process_unsupposed},
{ "setstat", NULL, SSH_FXP_SETSTAT, process_unsupposed},
{ "fsetstat", NULL, SSH_FXP_FSETSTAT, process_unsupposed},
{ "opendir", NULL, SSH_FXP_OPENDIR, process_opendir},
{ "readdir", NULL, SSH_FXP_READDIR, process_readdir},
{ "remove", NULL, SSH_FXP_REMOVE, process_remove},
{ "mkdir", NULL, SSH_FXP_MKDIR, process_mkdir},
{ "rmdir", NULL, SSH_FXP_RMDIR, process_rmdir},
{ "realpath", NULL, SSH_FXP_REALPATH, process_unsupposed},
{ "stat", NULL, SSH_FXP_STAT, process_unsupposed},
{ "rename", NULL, SSH_FXP_RENAME, process_unsupposed},
{ "readlink", NULL, SSH_FXP_READLINK, process_readlink},
{ "symlink", NULL, SSH_FXP_SYMLINK, process_symlink},
{ "init", NULL, SSH_FXP_INIT, sftp_process_init_packet},
{ NULL, NULL, 0, NULL}
};
const struct message_handler extended_handlers[] = {
/* here are some extended type handlers */
{ "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs},
{ NULL, NULL, 0, NULL}
};
struct sftp_handle s_handle_table[MAX_HANDLE_NUM];
void init_handle_table(int handle_num) {
int obj_size = sizeof(struct sftp_handle);
memset(s_handle_table, 0, obj_size*handle_num);
}
static void reinit_single_handle(struct sftp_handle* handle) {
handle->type = NULL_HANDLE;
handle->session_id = NULL;
handle->dirp = NULL;
handle->name = NULL;
handle->fd = -1;
}
static int handle_is_ok(int i, int type) {
return i >= 0 && (u_int)i < MAX_HANDLE_NUM && s_handle_table[i].type == type;
}
static int handle_close(int handle_ind) {
int ret = SSH_ERROR;
if (handle_is_ok(handle_ind, FILE_HANDLE)) {
close(s_handle_table[handle_ind].fd);
ret = SSH_OK;
} else if (handle_is_ok(handle_ind, DIR_HANDLE)) {
closedir((DIR *)s_handle_table[handle_ind].dirp);
ret = SSH_OK;
} else if (handle_is_ok(handle_ind, NULL_HANDLE)) {
ret = SSH_OK;
}
if (s_handle_table[handle_ind].name != NULL) {
free(s_handle_table[handle_ind].name);
s_handle_table[handle_ind].name = NULL;
}
return ret;
}
static int handle_close_by_pointer(struct sftp_handle* handle) {
if(handle->type == NULL_HANDLE)
return -1;
if(handle->fd > 0)
close(handle->fd);
if(handle->dirp!=NULL)
closedir(handle->dirp);
if(handle->name!=NULL){
free(handle->name);
handle->name = NULL;
}
return 0;
}
static void free_handles(int handle_num) {
for(int i = 0; i < handle_num; i++) {
handle_close(i);
//reinit this handle
reinit_single_handle(&s_handle_table[i]);
}
return;
}
static int add_handle(int type, void *dirp, int fd, const char *name, void *session_id) {
int ret = SSH_ERROR;
if(dirp == NULL && fd < 0){
return ret;
}
for(int i = 0; i<MAX_HANDLE_NUM; i++) {
if(s_handle_table[i].type == NULL_HANDLE){
s_handle_table[i].type = type;
s_handle_table[i].session_id = session_id;
s_handle_table[i].fd = fd;
s_handle_table[i].dirp = dirp;
s_handle_table[i].name = malloc((strlen(name) + 1) * sizeof(char));
strcpy(s_handle_table[i].name, name);
ret = i;
break;
}
}
if(ret==SSH_ERROR)
printf("no other space for new handle\n");
return ret;
}
static char* get_handle_name(struct sftp_handle* handle) {
char *ret = NULL;
if(handle!=NULL&&handle->name!=NULL)
ret = handle->name;
return ret;
}
static const char* ssh_str_error(int u_errno) {
switch (u_errno)
{
case SSH_FX_NO_SUCH_FILE:
return "No such file";
case SSH_FX_PERMISSION_DENIED:
return "Permission denied";
case SSH_FX_BAD_MESSAGE:
return "Bad message";
case SSH_FX_OP_UNSUPPORTED:
return "Operation not supported";
default:
return "Operation failed";
}
return "Operation failed";
}
static int unix_errno_to_ssh_stat(int u_errno) {
int ret = SSH_OK;
switch (u_errno) {
case 0:
break;
case ENOENT:
case ENOTDIR:
case EBADF:
case ELOOP:
ret = SSH_FX_NO_SUCH_FILE;
break;
case EPERM:
case EACCES:
case EFAULT:
ret = SSH_FX_PERMISSION_DENIED;
break;
case ENAMETOOLONG:
case EINVAL:
ret = SSH_FX_BAD_MESSAGE;
break;
case ENOSYS:
ret = SSH_FX_OP_UNSUPPORTED;
break;
default:
ret = SSH_FX_FAILURE;
break;
}
return ret;
}
static void stat_to_filexfer_attrib(const struct stat* z_st, struct sftp_attributes_struct* z_attr)
{
z_attr->flags = 0;
z_attr->flags |= (uint32_t)SSH_FILEXFER_ATTR_SIZE;
z_attr->size = z_st->st_size;
z_attr->flags |= (uint32_t)SSH_FILEXFER_ATTR_UIDGID;
z_attr->uid = z_st->st_uid;
z_attr->gid = z_st->st_gid;
z_attr->flags |= (uint32_t)SSH_FILEXFER_ATTR_PERMISSIONS;
z_attr->permissions = z_st->st_mode;
z_attr->flags |= (uint32_t)SSH_FILEXFER_ATTR_ACMODTIME;
z_attr->atime = z_st->st_atime;
z_attr->mtime = z_st->st_mtime;
}
static void clear_filexfer_attrib(struct sftp_attributes_struct* z_attr)
{
z_attr->flags = 0;
z_attr->size = 0;
z_attr->uid = 0;
z_attr->gid = 0;
z_attr->permissions = 0;
z_attr->atime = 0;
z_attr->mtime = 0;
}
static int readdir_long_name(char* z_file_name, struct stat* z_st, char* z_long_name)
{
char tmpbuf[MAX_LONG_NAME_LEN];
char time[50];
char* ptr = z_long_name;
int mode = z_st->st_mode;
*ptr = '\0';
switch(mode & S_IFMT)
{
case S_IFDIR:
{
*ptr++ = 'd';
break;
}
default:
{
*ptr++ = '-';
break;
}
}
/* user */
if(mode & 0400)
*ptr++ = 'r';
else
*ptr++ ='-';
if(mode & 0200)
*ptr++ = 'w';
else
*ptr++ = '-';
if(mode & 0100) {
if(mode & S_ISUID)
*ptr++ = 's';
else
*ptr++ = 'x';
} else
*ptr++ = '-';
/* group */
if(mode & 040)
*ptr++ = 'r';
else
*ptr++ = '-';
if(mode & 020)
*ptr++ = 'w';
else
*ptr++ ='-';
if(mode & 010)
*ptr++ = 'x';
else
*ptr++ = '-';
/* other */
if(mode & 04)
*ptr++ = 'r';
else
*ptr++ = '-';
if(mode & 02)
*ptr++ = 'w';
else
*ptr++ = '-';
if(mode & 01)
*ptr++ = 'x';
else
*ptr++ = '-';
*ptr++ = ' ';
*ptr = '\0';
snprintf(tmpbuf, sizeof(tmpbuf),"%3d %d %d %d", (int)z_st->st_nlink,
(int)z_st->st_uid, (int)z_st->st_gid, (int)z_st->st_size);
strcat(z_long_name, tmpbuf);
ctime_r(&z_st->st_mtime, time);
if((ptr = strchr(time,'\n')))
{
*ptr = '\0';
}
snprintf(tmpbuf,sizeof(tmpbuf)," %s %s", time + 4, z_file_name);
strcat(z_long_name, tmpbuf);
return SSH_OK;
}
static int process_open(sftp_client_message client_msg) {
int ret = SSH_OK;
const char *filename = sftp_client_message_get_filename(client_msg);
uint32_t msg_flag = sftp_client_message_get_flags(client_msg);
int file_flag;
int fd = -1;
int handle_ind = -1;
int status;
if (( (msg_flag&(uint32_t)SSH_FXF_READ) == SSH_FXF_READ) &&
( (msg_flag&(uint32_t)SSH_FXF_WRITE) == SSH_FXF_WRITE)) {
file_flag = O_RDWR; //file must exist
if ((msg_flag & (uint32_t)SSH_FXF_CREAT) == SSH_FXF_CREAT)
file_flag |= O_CREAT;
} else if ( (msg_flag&(uint32_t)SSH_FXF_WRITE) == SSH_FXF_WRITE ) {
file_flag = O_WRONLY;
if ( (msg_flag&(uint32_t)SSH_FXF_APPEND) == SSH_FXF_APPEND )
file_flag |= O_APPEND;
if ( (msg_flag&(uint32_t)SSH_FXF_CREAT) == SSH_FXF_CREAT )
file_flag |= O_CREAT;
} else {
file_flag = O_RDONLY;
}
fd = open(filename, file_flag, 0600);
if(fd == -1){
status = unix_errno_to_ssh_stat(errno);
printf("error open file with error: %d\n", errno);
sftp_reply_status(client_msg, status, "Write error");
ret = SSH_ERROR;
return ret;
}
handle_ind = add_handle(FILE_HANDLE, NULL, fd, filename, client_msg->sftp);
if(handle_ind >= 0){
void *handle_ptr = &s_handle_table[handle_ind];
ssh_string handle_s = sftp_handle_alloc(client_msg->sftp, handle_ptr);
sftp_reply_handle(client_msg, handle_s);
ssh_string_free(handle_s);
ret = SSH_OK;
}else {
close(fd);
printf("opening file failed");
sftp_reply_status(client_msg, SSH_FX_FAILURE, "No handle available");
}
return ret;
}
static int process_read(sftp_client_message client_msg) {
int ret = SSH_OK;
struct sftp_handle *client_handle = (struct sftp_handle*)sftp_handle(client_msg->sftp, client_msg->handle);
uint32_t readn;
int fd;
char *buffer;
int rv;
if (client_handle == NULL || client_handle->session_id != client_msg->sftp) {
printf("get wrong handle from msg\n");
sftp_reply_status(client_msg, SSH_FX_FAILURE, NULL);
return SSH_ERROR;
}
fd = client_handle->fd;
if (fd < 0) {
sftp_reply_status(client_msg, SSH_FX_INVALID_HANDLE, NULL);
printf("error reading file fd: %d\n", fd);
ret = SSH_ERROR;
return ret;
}
rv = lseek(fd, client_msg->offset, SEEK_SET);
if (rv == -1) {
sftp_reply_status(client_msg, SSH_FX_FAILURE, NULL);
printf("error seeking file fd: %d at offset: %ld\n", fd, client_msg->offset);
ret = SSH_ERROR;
return ret;
}
buffer = malloc((client_msg->len)*sizeof(char));
readn = read(fd, buffer, client_msg->len);
if(readn > 0){
sftp_reply_data(client_msg, buffer, readn);
}else if(readn == 0) {
sftp_reply_status(client_msg, SSH_FX_EOF, "EOF encountered");
}else {
sftp_reply_status(client_msg, SSH_FX_FAILURE, NULL);
printf("read file error!\n");
}
return ret;
}
static int process_write(sftp_client_message client_msg) {
int ret = SSH_OK;
struct sftp_handle *client_handle = (struct sftp_handle*)sftp_handle(client_msg->sftp, client_msg->handle);
uint32_t writen;
int fd;
const char *msg_data;
uint32_t len;
int rv;
if (client_handle == NULL || client_handle->session_id != client_msg->sftp) {
printf("get wrong handle from msg\n");
sftp_reply_status(client_msg, SSH_FX_FAILURE, NULL);
return SSH_ERROR;
}
fd = client_handle->fd;
if (fd < 0) {
sftp_reply_status(client_msg, SSH_FX_INVALID_HANDLE, NULL);
printf("write file fd error!\n");
ret = SSH_ERROR;
return ret;
}
msg_data = ssh_string_get_char(client_msg->data);
len = ssh_string_len(client_msg->data);
rv = lseek(fd, client_msg->offset, SEEK_SET);
if (rv == -1) {
sftp_reply_status(client_msg, SSH_FX_FAILURE, NULL);
printf("error seeking file at offset: %ld\n", client_msg->offset);
}
writen = write(fd, msg_data, len);
if(writen == len) {
sftp_reply_status(client_msg, SSH_FX_OK, NULL);
}else {
sftp_reply_status(client_msg, SSH_FX_FAILURE, "Write error");
}
return ret;
}
static int process_close(sftp_client_message client_msg) {
int ret = SSH_OK;
struct sftp_handle *client_handle = (struct sftp_handle*)sftp_handle(client_msg->sftp, client_msg->handle);
if (client_handle == NULL) {
printf("get wrong handle from msg\n");
return SSH_ERROR;
}
ret = handle_close_by_pointer(client_handle);
if (ret == SSH_OK) {
reinit_single_handle(client_handle);
sftp_reply_status(client_msg, SSH_FX_OK, NULL);
} else {
printf("closing file failed\n");
sftp_reply_status(client_msg, SSH_FX_BAD_MESSAGE, "Invalid handle");
}
return ret;
}
static int process_opendir(sftp_client_message client_msg) {
int ret = SSH_OK;
DIR *dir = NULL;
const char *dir_name = sftp_client_message_get_filename(client_msg);
int handle_ind = -1;
dir = opendir(dir_name);
if (dir == NULL) {
sftp_reply_status(client_msg, SSH_FX_NO_SUCH_FILE, "No such directory");
return SSH_ERROR;
}
handle_ind = add_handle(DIR_HANDLE, dir, -1, dir_name, client_msg->sftp);
if (handle_ind >= 0) {
ssh_string handle_s = sftp_handle_alloc(client_msg->sftp, &s_handle_table[handle_ind]);
sftp_reply_handle(client_msg, handle_s);
ssh_string_free(handle_s);
ret = SSH_OK;
} else {
closedir(dir);
sftp_reply_status(client_msg, SSH_FX_FAILURE, "No handle available");
}
return ret;
}
static int process_readdir(sftp_client_message client_msg) {
int ret = SSH_OK;
struct sftp_handle *client_handle = (struct sftp_handle*)sftp_handle(client_msg->sftp, client_msg->handle);
int entries = 0;
struct dirent *dentry;
DIR *dir = NULL;
char long_path[PATH_MAX];
int path_length;
char *handle_name;
if (client_handle == NULL || client_handle->session_id != client_msg->sftp) {
printf("get wrong handle from msg\n");
sftp_reply_status(client_msg, SSH_FX_FAILURE, NULL);
return SSH_ERROR;
}
dir = client_handle->dirp;
if (dir == NULL) {
sftp_reply_status(client_msg, SSH_FX_INVALID_HANDLE, NULL);
printf("read dir handle error!\n");
ret = SSH_ERROR;
return ret;
}
ret = SSH_OK;
handle_name = get_handle_name(client_handle);
if (handle_name == NULL) {
sftp_reply_status(client_msg, SSH_FX_INVALID_HANDLE, NULL);
return SSH_ERROR;
}
strcpy(long_path, handle_name);
strcat(long_path, "/");
path_length = (int)strlen(long_path);
for(int i=0; i < MAX_ENTRIES_NUM_IN_PACKET; i++) {
dentry = readdir(dir);
if (dentry!=NULL) {
struct sftp_attributes_struct attr;
struct stat st;
char long_name[MAX_LONG_NAME_LEN];
strcpy(&long_path[path_length], dentry->d_name);
if(lstat(long_path, &st) == 0) {
stat_to_filexfer_attrib(&st, &attr);
}
else {
clear_filexfer_attrib(&attr);
}
if(readdir_long_name(dentry->d_name, &st, long_name) == 0){
sftp_reply_names_add(client_msg, dentry->d_name, long_name, &attr);
} else {
printf("readdir long name error\n");
}
entries++;
} else {
break;
}
}
if (entries > 0) {
ret = sftp_reply_names(client_msg);
} else {
sftp_reply_status(client_msg, SSH_FX_EOF, NULL);
}
return ret;
}
static int process_mkdir(sftp_client_message client_msg) {
int ret = SSH_OK;
const char *filename = sftp_client_message_get_filename(client_msg);
uint32_t msg_flags = client_msg->flags;
uint32_t permission = client_msg->attr->permissions;
uint32_t mode = (msg_flags & (uint32_t)SSH_FILEXFER_ATTR_PERMISSIONS) ? permission & (uint32_t)07777 : 0777;
int status = SSH_FX_OK;
int rv;
if (filename==NULL) {
sftp_reply_status(client_msg, SSH_FX_NO_SUCH_FILE, "File name error");
return SSH_ERROR;
}
rv = mkdir(filename, mode);
if (rv < 0) {
status = unix_errno_to_ssh_stat(errno);
ret = SSH_ERROR;
}
sftp_reply_status(client_msg, status, NULL);
return ret;
}
static int process_rmdir(sftp_client_message client_msg) {
int ret = SSH_OK;
const char *filename = sftp_client_message_get_filename(client_msg);
int status = SSH_FX_OK;
int rv;
if (filename==NULL) {
sftp_reply_status(client_msg, SSH_FX_NO_SUCH_FILE, "File name error");
return SSH_ERROR;
}
rv = rmdir(filename);
if (rv < 0) {
status = unix_errno_to_ssh_stat(errno);
ret = SSH_ERROR;
}
sftp_reply_status(client_msg, status, NULL);
return ret;
}
static int process_lstat(sftp_client_message client_msg) {
int ret = SSH_OK;
const char *filename = sftp_client_message_get_filename(client_msg);
struct sftp_attributes_struct attr;
struct stat st;
int status = SSH_FX_OK;
int rv;
if (filename==NULL) {
sftp_reply_status(client_msg, SSH_FX_NO_SUCH_FILE, "File name error");
return SSH_ERROR;
}
rv = lstat(filename, &st);
if (rv < 0) {
status = unix_errno_to_ssh_stat(errno);
sftp_reply_status(client_msg, status, NULL);
ret = SSH_ERROR;
} else {
stat_to_filexfer_attrib(&st, &attr);
sftp_reply_attr(client_msg, &attr);
}
return ret;
}
static int process_readlink(sftp_client_message client_msg) {
int ret = SSH_OK;
const char *filename = sftp_client_message_get_filename(client_msg);
char buf[PATH_MAX];
int len = -1;
const char *err_msg;
int status = SSH_FX_OK;
if (filename==NULL) {
sftp_reply_status(client_msg, SSH_FX_NO_SUCH_FILE, "File name error");
return SSH_ERROR;
}
len = readlink(filename, buf, sizeof(buf) - 1);
if (len < 0) {
printf("read link error with reason: %d\n", errno);
status = unix_errno_to_ssh_stat(errno);
err_msg = ssh_str_error(status);
sftp_reply_status(client_msg, status, err_msg);
ret = SSH_ERROR;
} else {
buf[len] = '\0';
sftp_reply_name(client_msg, buf, NULL);
}
return ret;
}
static int process_symlink(sftp_client_message client_msg) {
int ret = SSH_OK;
const char *destpath = sftp_client_message_get_filename(client_msg);
const char *srcpath = ssh_string_get_char(client_msg->data);
int status = SSH_FX_OK;
int rv;
// printf("try to create link with src: %s and dest: %s \n", srcpath, destpath);
if (srcpath == NULL || destpath == NULL) {
sftp_reply_status(client_msg, SSH_FX_NO_SUCH_FILE, "File name error");
return SSH_ERROR;
}
rv = symlink(srcpath, destpath);
if (rv < 0) {
status = unix_errno_to_ssh_stat(errno);
printf("error symlink with error: %d\n", errno);
sftp_reply_status(client_msg, status, "Write error");
ret = SSH_ERROR;
} else {
sftp_reply_status(client_msg, SSH_FX_OK, "write success");
}
return ret;
}
static int process_remove(sftp_client_message client_msg) {
int ret = SSH_OK;
const char *filename = sftp_client_message_get_filename(client_msg);
int rv;
int status = SSH_FX_OK;
rv = unlink(filename);
if (rv < 0) {
printf("unlink error with reason: %d\n", errno);
status = unix_errno_to_ssh_stat(errno);
ret = SSH_ERROR;
}
sftp_reply_status(client_msg, status, NULL);
return ret;
}
static int process_unsupposed(sftp_client_message client_msg) {
int ret = SSH_OK;
sftp_reply_status(client_msg, SSH_FX_OP_UNSUPPORTED, "Operation not supported");
printf("Message type %d not implemented\n", sftp_client_message_get_type(client_msg));
return ret;
}
static int process_extended_statvfs(sftp_client_message client_msg) {
int ret = SSH_OK;
const char *path = sftp_client_message_get_filename(client_msg);
struct statvfs st;
int status;
int rv;
rv = statvfs(path, &st);
if (rv == 0) {
sftp_statvfs_t sftp_statvfs;
u_int64_t flag;
sftp_statvfs = calloc(1, sizeof(struct sftp_statvfs_struct));
if (sftp_statvfs == NULL) {
goto error;
}
flag = (st.f_flag & ST_RDONLY) ? SSH_FXE_STATVFS_ST_RDONLY : 0;
flag |= (st.f_flag & ST_NOSUID) ? SSH_FXE_STATVFS_ST_NOSUID : 0;
sftp_statvfs->f_bsize = st.f_bsize;
sftp_statvfs->f_frsize = st.f_frsize;
sftp_statvfs->f_blocks = st.f_blocks;
sftp_statvfs->f_bfree = st.f_bfree;
sftp_statvfs->f_bavail = st.f_bavail;
sftp_statvfs->f_files = st.f_files;
sftp_statvfs->f_ffree = st.f_ffree;
sftp_statvfs->f_favail = st.f_favail;
sftp_statvfs->f_fsid = st.f_fsid;
sftp_statvfs->f_flag = flag;
sftp_statvfs->f_namemax = st.f_namemax;
if(sftp_reply_statvfs(client_msg, sftp_statvfs) == 0)
return ret;
}
error:
status = unix_errno_to_ssh_stat(errno);
ret = SSH_ERROR;
sftp_reply_status(client_msg, status, NULL);
printf("statvfs send failed!\n");
return ret;
}
static int process_extended(sftp_client_message sftp_msg) {
int status = SSH_ERROR;
const char *subtype = sftp_msg->submessage;
client_message_callback handler = NULL;
for(int i=0;extended_handlers[i].cb!=NULL;i++){
if (strcmp(subtype, extended_handlers[i].extended_name) == 0) {
handler = extended_handlers[i].cb;
break;
}
}
if (handler!=NULL) {
status = handler(sftp_msg);
return status;
}
sftp_reply_status(sftp_msg, SSH_FX_OP_UNSUPPORTED, "Extended Operation not supported");
printf("Extended Message type %s not implemented\n", subtype);
return SSH_OK;
return status;
}
static int dispatch_sftp_request(sftp_client_message sftp_msg) {
int status = SSH_ERROR;
client_message_callback handler = NULL;
u_int sft_msg_type = sftp_client_message_get_type(sftp_msg);
for(int i=0;message_handlers[i].cb!=NULL;i++){
if (sft_msg_type == message_handlers[i].type) {
handler = message_handlers[i].cb;
break;
}
}
if (handler!=NULL)
status = handler(sftp_msg);
else
goto not_implemented;
return status;
not_implemented:
sftp_reply_status(sftp_msg, SSH_FX_OP_UNSUPPORTED, "Operation not supported");
printf("Message type %d not implemented\n", sft_msg_type);
return SSH_OK;
}
static int process_client_message(sftp_client_message client_msg) {
int status = SSH_OK;
if (client_msg == NULL) {
return SSH_ERROR;
}
switch(client_msg->type) {
case SSH_FXP_EXTENDED:
status = process_extended(client_msg);
break;
default:
status = dispatch_sftp_request(client_msg);
}
// status = dispatch_sftp_request(client_msg);
if (status!=SSH_OK)
printf("error occur in process client message!\n");
return status;
}
/* TODO implement proper pam authentication cb */
static int sftp_auth_password_cb(UNUSED_PARAM(ssh_session session),
const char *user,
const char *password,
void *userdata)
{
bool known_user = false;
bool valid_password = false;
struct session_data_st *sdata;
sdata = (struct session_data_st *)userdata;
if (sdata == NULL) {
fprintf(stderr, "Error: NULL userdata\n");
goto null_userdata;
}
if (sdata->username == NULL) {
fprintf(stderr, "Error: expected username not set\n");
goto denied;
}
if (sdata->password == NULL) {
fprintf(stderr, "Error: expected password not set\n");
goto denied;
}
printf("Password authentication of user %s\n", user);
known_user = !(strcmp(user, sdata->username));
valid_password = !(strcmp(password, sdata->password));
if (known_user && valid_password) {
sdata->authenticated = 1;
sdata->auth_attempts = 0;
printf("Authenticated\n");
return SSH_AUTH_SUCCESS;
}
denied:
sdata->auth_attempts++;
null_userdata:
return SSH_AUTH_DENIED;
}
static int sftp_channel_data_cb(UNUSED_PARAM(ssh_session session),
UNUSED_PARAM(ssh_channel channel),
void *data,
uint32_t len,
UNUSED_PARAM(int is_stderr),
void *userdata)
{
struct channel_data_st *cdata = (struct channel_data_st *) userdata;
sftp_session sftp = cdata->sftp;
sftp_client_message msg;
int decode_len;
int rc;
decode_len = sftp_decode_channel_data_to_packet(sftp, data);
if(decode_len == -1)
return -1;
msg = sftp_get_client_message_from_packet(cdata->sftp);
rc = process_client_message(msg);
sftp_client_message_free(msg);
if(rc != SSH_OK)
printf("process sftp failed!\n");
return decode_len;
}
static int sftp_channel_subsystem_request_cb(ssh_session session,
ssh_channel channel,
const char *subsystem,
void *userdata)
{
if (strcmp(subsystem, "sftp") == 0) {
struct channel_data_st* cdata = (struct channel_data_st*) userdata;
/* initialize sftp session and file handler */
cdata->sftp = sftp_server_new(session, channel);
init_handle_table(MAX_HANDLE_NUM);
return SSH_OK;
}
return SSH_ERROR;
}
static int sftp_channel_write_wontblock_cb(UNUSED_PARAM(ssh_session session),
UNUSED_PARAM(ssh_channel channel),
UNUSED_PARAM(size_t bytes),
UNUSED_PARAM(void *userdata))
{
/* TODO */
return 0;
}
static ssh_channel sftp_channel_new_session_cb(ssh_session session, void *userdata)
{
struct session_data_st *sdata = NULL;
ssh_channel chan = NULL;
sdata = (struct session_data_st *)userdata;
if (sdata == NULL) {
fprintf(stderr, "NULL userdata");
goto end;
}
chan = ssh_channel_new(session);
if (chan == NULL) {
fprintf(stderr, "Error creating channel: %s\n",
ssh_get_error(session));
goto end;
}
sdata->channel = chan;
end:
return chan;
}
#ifdef WITH_PCAP
static void set_pcap(struct session_data_st *sdata,
ssh_session session,
char *pcap_file)
{
int rc = 0;
if (sdata == NULL) {
return;
}
if (pcap_file == NULL) {
return;
}
sdata->pcap = ssh_pcap_file_new();
if (sdata->pcap == NULL) {
return;
}
rc = ssh_pcap_file_open(sdata->pcap, pcap_file);
if (rc == SSH_ERROR) {
fprintf(stderr, "Error opening pcap file\n");
ssh_pcap_file_free(sdata->pcap);
sdata->pcap = NULL;
return;
}
ssh_set_pcap_file(session, sdata->pcap);
}
static void cleanup_pcap(struct session_data_st *sdata)
{
if (sdata == NULL) {
return;
}
if (sdata->pcap == NULL) {
return;
}
ssh_pcap_file_free(sdata->pcap);
sdata->pcap = NULL;
}
#endif
/* The caller is responsible to set the userdata to be provided to the callback
* The caller is responsible to free the allocated structure
* */
struct ssh_server_callbacks_struct *get_sftp_server_cb(void)
{
struct ssh_server_callbacks_struct *cb;
cb = (struct ssh_server_callbacks_struct *)calloc(1,
sizeof(struct ssh_server_callbacks_struct));
if (cb == NULL) {
fprintf(stderr, "Out of memory\n");
goto end;
}
cb->auth_password_function = sftp_auth_password_cb;
cb->channel_open_request_session_function = sftp_channel_new_session_cb;
end:
return cb;
}
/* The caller is responsible to set the userdata to be provided to the callback
* The caller is responsible to free the allocated structure
* */
struct ssh_channel_callbacks_struct *get_sftp_channel_cb(void)
{
struct ssh_channel_callbacks_struct *cb;
cb = (struct ssh_channel_callbacks_struct *)calloc(1,
sizeof(struct ssh_channel_callbacks_struct));
if (cb == NULL) {
fprintf(stderr, "Out of memory\n");
goto end;
}
cb->channel_subsystem_request_function = sftp_channel_subsystem_request_cb;
cb->channel_data_function = sftp_channel_data_cb;
end:
return cb;
};
void sftp_handle_session_cb(ssh_event event,
ssh_session session,
struct server_state_st *state)
{
int n;
int rc = 0;
/* Structure for storing the pty size. */
struct winsize wsize = {
.ws_row = 0,
.ws_col = 0,
.ws_xpixel = 0,
.ws_ypixel = 0
};
/* Our struct holding information about the channel. */
struct channel_data_st cdata = {
.pid = 0,
.pty_master = -1,
.pty_slave = -1,
.child_stdin = -1,
.child_stdout = -1,
.child_stderr = -1,
.event = NULL,
.winsize = &wsize,
.sftp = NULL
};
/* Our struct holding information about the session. */
struct session_data_st sdata = {
.channel = NULL,
.auth_attempts = 0,
.authenticated = 0,
.username = SSHD_DEFAULT_USER,
.password = SSHD_DEFAULT_PASSWORD
};
struct ssh_channel_callbacks_struct *channel_cb = NULL;
struct ssh_server_callbacks_struct *server_cb = NULL;
if (state == NULL) {
fprintf(stderr, "NULL server state provided\n");
goto end;
}
/* If callbacks were provided use them. Otherwise, use default callbacks */
if (state->server_cb != NULL) {
/* This is a macro, it does not return a value */
ssh_callbacks_init(state->server_cb);
rc = ssh_set_server_callbacks(session, state->server_cb);
if (rc) {
goto end;
}
} else {
server_cb = get_sftp_server_cb();
if (server_cb == NULL) {
goto end;
}
server_cb->userdata = &sdata;
/* This is a macro, it does not return a value */
ssh_callbacks_init(server_cb);
rc = ssh_set_server_callbacks(session, server_cb);
if (rc) {
goto end;
}
}
sdata.server_state = (void *)state;
cdata.server_state = (void *)state;
#ifdef WITH_PCAP
set_pcap(&sdata, session, state->pcap_file);
#endif
if (state->expected_username != NULL) {
sdata.username = state->expected_username;
}
if (state->expected_password != NULL) {
sdata.password = state->expected_password;
}
if (ssh_handle_key_exchange(session) != SSH_OK) {
fprintf(stderr, "%s\n", ssh_get_error(session));
return;
}
/* Set the supported authentication methods */
if (state->auth_methods) {
ssh_set_auth_methods(session, state->auth_methods);
} else {
ssh_set_auth_methods(session,
SSH_AUTH_METHOD_PASSWORD |
SSH_AUTH_METHOD_PUBLICKEY);
}
ssh_event_add_session(event, session);
n = 0;
while (sdata.authenticated == 0 || sdata.channel == NULL) {
/* If the user has used up all attempts, or if he hasn't been able to
* authenticate in 10 seconds (n * 100ms), disconnect. */
if (sdata.auth_attempts >= state->max_tries || n >= 100) {
return;
}
if (ssh_event_dopoll(event, 100) == SSH_ERROR) {
fprintf(stderr, "do_poll error: %s\n", ssh_get_error(session));
return;
}
n++;
}
/* TODO check return values */
if (state->channel_cb != NULL) {
ssh_callbacks_init(state->channel_cb);
rc = ssh_set_channel_callbacks(sdata.channel, state->channel_cb);
if (rc) {
goto end;
}
} else {
channel_cb = get_sftp_channel_cb();
if (channel_cb == NULL) {
goto end;
}
channel_cb->userdata = &cdata;
ssh_callbacks_init(channel_cb);
rc = ssh_set_channel_callbacks(sdata.channel, channel_cb);
if (rc) {
goto end;
}
}
do {
/* Poll the main event which takes care of the session, the channel and
* even our child process's stdout/stderr (once it's started). */
if (ssh_event_dopoll(event, -1) == SSH_ERROR) {
ssh_channel_close(sdata.channel);
}
/* If child process's stdout/stderr has been registered with the event,
* or the child process hasn't started yet, continue. */
if (cdata.event != NULL || cdata.pid == 0) {
continue;
}
} while(ssh_channel_is_open(sdata.channel) &&
(cdata.pid == 0 || waitpid(cdata.pid, &rc, WNOHANG) == 0));
free_handles(MAX_HANDLE_NUM);
ssh_channel_send_eof(sdata.channel);
ssh_channel_close(sdata.channel);
/* Wait up to 5 seconds for the client to terminate the session. */
for (n = 0; n < 50 && (ssh_get_status(session) & SESSION_END) == 0; n++) {
ssh_event_dopoll(event, 100);
}
end:
#ifdef WITH_PCAP
cleanup_pcap(&sdata);
#endif
if (channel_cb != NULL) {
free(channel_cb);
}
if (server_cb != NULL) {
free(server_cb);
}
return;
}
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