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curl/lib/ssh.c

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
***************************************************************************/
/* #define CURL_LIBSSH2_DEBUG */
#include "setup.h"
#ifdef USE_LIBSSH2
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <ctype.h>
#include <limits.h>
#include <libssh2.h>
#include <libssh2_sftp.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifndef WIN32
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_UTSNAME_H
#include <sys/utsname.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef VMS
#include <in.h>
#include <inet.h>
#endif
#endif /* !WIN32 */
#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
#undef in_addr_t
#define in_addr_t unsigned long
#endif
#include <curl/curl.h>
#include "urldata.h"
#include "sendf.h"
#include "easyif.h" /* for Curl_convert_... prototypes */
#include "if2ip.h"
#include "hostip.h"
#include "progress.h"
#include "transfer.h"
#include "escape.h"
#include "http.h" /* for HTTP proxy tunnel stuff */
#include "ssh.h"
#include "url.h"
#include "speedcheck.h"
#include "getinfo.h"
#include "strtoofft.h"
#include "strequal.h"
#include "sslgen.h"
#include "connect.h"
#include "strerror.h"
#include "memory.h"
#include "inet_ntop.h"
#include "select.h"
#include "parsedate.h" /* for the week day and month names */
#include "sockaddr.h" /* required for Curl_sockaddr_storage */
#include "multiif.h"
#if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
#include "inet_ntoa_r.h"
#endif
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#if defined(WIN32) || defined(MSDOS) || defined(__EMX__)
#define DIRSEP '\\'
#else
#define DIRSEP '/'
#endif
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#ifdef CURLDEBUG
#include "memdebug.h"
#endif
#ifndef LIBSSH2_SFTP_S_IRUSR
/* Here's a work-around for those of you who happend to run a libssh2 version
that is 0.14 or older. We should remove this kludge as soon as we can
require a more recent libssh2 release. */
#ifndef S_IRGRP
#define S_IRGRP 0
#endif
#ifndef S_IROTH
#define S_IROTH 0
#endif
#define LIBSSH2_SFTP_S_IRUSR S_IRUSR
#define LIBSSH2_SFTP_S_IWUSR S_IWUSR
#define LIBSSH2_SFTP_S_IRGRP S_IRGRP
#define LIBSSH2_SFTP_S_IROTH S_IROTH
#define LIBSSH2_SFTP_S_IRUSR S_IRUSR
#define LIBSSH2_SFTP_S_IWUSR S_IWUSR
#define LIBSSH2_SFTP_S_IRGRP S_IRGRP
#define LIBSSH2_SFTP_S_IROTH S_IROTH
#define LIBSSH2_SFTP_S_IFMT S_IFMT
#define LIBSSH2_SFTP_S_IFDIR S_IFDIR
#define LIBSSH2_SFTP_S_IFLNK S_IFLNK
#define LIBSSH2_SFTP_S_IFSOCK S_IFSOCK
#define LIBSSH2_SFTP_S_IFCHR S_IFCHR
#define LIBSSH2_SFTP_S_IFBLK S_IFBLK
#define LIBSSH2_SFTP_S_IXUSR S_IXUSR
#define LIBSSH2_SFTP_S_IWGRP S_IWGRP
#define LIBSSH2_SFTP_S_IXGRP S_IXGRP
#define LIBSSH2_SFTP_S_IWOTH S_IWOTH
#define LIBSSH2_SFTP_S_IXOTH S_IXOTH
#endif
/* Local functions: */
static const char *sftp_libssh2_strerror(unsigned long err);
static CURLcode sftp_sendquote(struct connectdata *conn,
struct curl_slist *quote);
static LIBSSH2_ALLOC_FUNC(libssh2_malloc);
static LIBSSH2_REALLOC_FUNC(libssh2_realloc);
static LIBSSH2_FREE_FUNC(libssh2_free);
static void
kbd_callback(const char *name, int name_len, const char *instruction,
int instruction_len, int num_prompts,
const LIBSSH2_USERAUTH_KBDINT_PROMPT *prompts,
LIBSSH2_USERAUTH_KBDINT_RESPONSE *responses,
void **abstract)
{
struct SSHPROTO *ssh = (struct SSHPROTO *)*abstract;
#ifdef CURL_LIBSSH2_DEBUG
fprintf(stderr, "name=%s\n", name);
fprintf(stderr, "name_len=%d\n", name_len);
fprintf(stderr, "instruction=%s\n", instruction);
fprintf(stderr, "instruction_len=%d\n", instruction_len);
fprintf(stderr, "num_prompts=%d\n", num_prompts);
#else
(void)name;
(void)name_len;
(void)instruction;
(void)instruction_len;
#endif /* CURL_LIBSSH2_DEBUG */
if (num_prompts == 1) {
responses[0].text = strdup(ssh->passwd);
responses[0].length = strlen(ssh->passwd);
}
(void)prompts;
(void)abstract;
} /* kbd_callback */
static CURLcode sftp_libssh2_error_to_CURLE(unsigned long err)
{
if (err == LIBSSH2_FX_OK)
return CURLE_OK;
/* TODO: map some of the libssh2 errors to the more appropriate CURLcode
error code, and possibly add a few new SSH-related one. We must however
not return or even depend on libssh2 errors in the public libcurl API */
if (err == LIBSSH2_FX_NO_SUCH_FILE)
return CURLE_REMOTE_FILE_NOT_FOUND;
return CURLE_SSH;
}
static CURLcode libssh2_session_error_to_CURLE(int err)
{
(void)err;
return CURLE_SSH;
}
static LIBSSH2_ALLOC_FUNC(libssh2_malloc)
{
return malloc(count);
(void)abstract;
}
static LIBSSH2_REALLOC_FUNC(libssh2_realloc)
{
return realloc(ptr, count);
(void)abstract;
}
static LIBSSH2_FREE_FUNC(libssh2_free)
{
free(ptr);
(void)abstract;
}
static CURLcode ssh_init(struct connectdata *conn)
{
struct SessionHandle *data = conn->data;
struct SSHPROTO *ssh;
if (data->reqdata.proto.ssh)
return CURLE_OK;
ssh = (struct SSHPROTO *)calloc(sizeof(struct SSHPROTO), 1);
if (!ssh)
return CURLE_OUT_OF_MEMORY;
data->reqdata.proto.ssh = ssh;
/* get some initial data into the ssh struct */
ssh->bytecountp = &data->reqdata.keep.bytecount;
/* no need to duplicate them, this connectdata struct won't change */
ssh->user = conn->user;
ssh->passwd = conn->passwd;
ssh->errorstr = NULL;
ssh->ssh_session = NULL;
ssh->ssh_channel = NULL;
ssh->sftp_session = NULL;
ssh->sftp_handle = NULL;
return CURLE_OK;
}
/*
* Curl_ssh_connect() gets called from Curl_protocol_connect() to allow us to
* do protocol-specific actions at connect-time.
*/
CURLcode Curl_ssh_connect(struct connectdata *conn, bool *done)
{
int i;
struct SSHPROTO *ssh;
const char *fingerprint;
const char *authlist;
char tempHome[PATH_MAX];
curl_socket_t sock;
char *real_path;
char *working_path;
int working_path_len;
bool authed = FALSE;
CURLcode result;
struct SessionHandle *data = conn->data;
result = ssh_init(conn);
if (result)
return result;
ssh = data->reqdata.proto.ssh;
working_path = curl_easy_unescape(data, data->reqdata.path, 0,
&working_path_len);
if (!working_path)
return CURLE_OUT_OF_MEMORY;
#ifdef CURL_LIBSSH2_DEBUG
if (ssh->user) {
infof(data, "User: %s\n", ssh->user);
}
if (ssh->passwd) {
infof(data, "Password: %s\n", ssh->passwd);
}
#endif /* CURL_LIBSSH2_DEBUG */
sock = conn->sock[FIRSTSOCKET];
ssh->ssh_session = libssh2_session_init_ex(libssh2_malloc, libssh2_free,
libssh2_realloc, ssh);
if (ssh->ssh_session == NULL) {
failf(data, "Failure initialising ssh session");
Curl_safefree(working_path);
return CURLE_FAILED_INIT;
}
#ifdef CURL_LIBSSH2_DEBUG
libssh2_trace(ssh->ssh_session, LIBSSH2_TRACE_CONN|LIBSSH2_TRACE_TRANS|LIBSSH2_TRACE_KEX|LIBSSH2_TRACE_AUTH|LIBSSH2_TRACE_SCP|LIBSSH2_TRACE_SFTP|LIBSSH2_TRACE_ERROR|LIBSSH2_TRACE_PUBLICKEY);
infof(data, "SSH socket: %d\n", sock);
#endif /* CURL_LIBSSH2_DEBUG */
if (libssh2_session_startup(ssh->ssh_session, sock)) {
failf(data, "Failure establishing ssh session");
libssh2_session_free(ssh->ssh_session);
ssh->ssh_session = NULL;
Curl_safefree(working_path);
return CURLE_FAILED_INIT;
}
/*
* Before we authenticate we should check the hostkey's fingerprint against
* our known hosts. How that is handled (reading from file, whatever) is
* up to us. As for know not much is implemented, besides showing how to
* get the fingerprint.
*/
fingerprint = libssh2_hostkey_hash(ssh->ssh_session,
LIBSSH2_HOSTKEY_HASH_MD5);
#ifdef CURL_LIBSSH2_DEBUG
/* The fingerprint points to static storage (!), don't free() it. */
infof(data, "Fingerprint: ");
for (i = 0; i < 16; i++) {
infof(data, "%02X ", (unsigned char) fingerprint[i]);
}
infof(data, "\n");
#endif /* CURL_LIBSSH2_DEBUG */
/* TBD - methods to check the host keys need to be done */
/*
* Figure out authentication methods
* NB: As soon as we have provided a username to an openssh server we must
* never change it later. Thus, always specify the correct username here,
* even though the libssh2 docs kind of indicate that it should be possible
* to get a 'generic' list (not user-specific) of authentication methods,
* presumably with a blank username. That won't work in my experience.
* So always specify it here.
*/
authlist = libssh2_userauth_list(ssh->ssh_session, ssh->user,
strlen(ssh->user));
if (!authlist) {
libssh2_session_free(ssh->ssh_session);
ssh->ssh_session = NULL;
Curl_safefree(working_path);
return CURLE_OUT_OF_MEMORY;
}
infof(data, "SSH authentication methods available: %s\n", authlist);
/*
* Check the supported auth types in the order I feel is most secure with the
* requested type of authentication
*/
if ((data->set.ssh_auth_types & CURLSSH_AUTH_PUBLICKEY) &&
(strstr(authlist, "publickey") != NULL)) {
char *home;
const char *passphrase;
char rsa_pub[PATH_MAX];
char rsa[PATH_MAX];
rsa_pub[0] = rsa[0] = '\0';
/* To ponder about: should really the lib be messing about with the HOME
environment variable etc? */
home = curl_getenv("HOME");
if (data->set.ssh_public_key)
snprintf(rsa_pub, sizeof(rsa_pub), "%s", data->set.ssh_public_key);
else if (home)
snprintf(rsa_pub, sizeof(rsa_pub), "%s/.ssh/id_dsa.pub", home);
if (data->set.ssh_private_key)
snprintf(rsa, sizeof(rsa), "%s", data->set.ssh_private_key);
else if (home)
snprintf(rsa, sizeof(rsa), "%s/.ssh/id_dsa", home);
passphrase = data->set.key_passwd;
if (!passphrase)
passphrase = "";
curl_free(home);
infof(conn->data, "Using ssh public key file %s\n", rsa_pub);
infof(conn->data, "Using ssh private key file %s\n", rsa);
if (rsa_pub[0]) {
/* The function below checks if the files exists, no need to stat() here.
*/
if (libssh2_userauth_publickey_fromfile(ssh->ssh_session, ssh->user,
rsa_pub, rsa, passphrase) == 0) {
authed = TRUE;
infof(conn->data, "Initialized SSH public key authentication\n");
}
}
}
if (!authed &&
(data->set.ssh_auth_types & CURLSSH_AUTH_PASSWORD) &&
(strstr(authlist, "password") != NULL)) {
if (!libssh2_userauth_password(ssh->ssh_session, ssh->user, ssh->passwd)) {
authed = TRUE;
infof(conn->data, "Initialized password authentication\n");
}
}
if (!authed && (data->set.ssh_auth_types & CURLSSH_AUTH_HOST) &&
(strstr(authlist, "hostbased") != NULL)) {
}
if (!authed && (data->set.ssh_auth_types & CURLSSH_AUTH_KEYBOARD)
&& (strstr(authlist, "keyboard-interactive") != NULL)) {
/* Authentication failed. Continue with keyboard-interactive now. */
if (libssh2_userauth_keyboard_interactive_ex(ssh->ssh_session, ssh->user,
strlen(ssh->user),
&kbd_callback) == 0) {
authed = TRUE;
infof(conn->data, "Initialized keyboard interactive authentication\n");
}
}
Curl_safefree((void *)authlist);
authlist = NULL;
if (!authed) {
failf(data, "Authentication failure");
libssh2_session_free(ssh->ssh_session);
ssh->ssh_session = NULL;
Curl_safefree(working_path);
return CURLE_LOGIN_DENIED;
}
/*
* At this point we have an authenticated ssh session.
*/
infof(conn->data, "Authentication complete\n");
conn->sockfd = sock;
conn->writesockfd = CURL_SOCKET_BAD;
if (conn->protocol == PROT_SFTP) {
/*
* Start the libssh2 sftp session
*/
ssh->sftp_session = libssh2_sftp_init(ssh->ssh_session);
if (ssh->sftp_session == NULL) {
failf(data, "Failure initialising sftp session\n");
libssh2_session_free(ssh->ssh_session);
ssh->ssh_session = NULL;
Curl_safefree(working_path);
return CURLE_FAILED_INIT;
}
/*
* Get the "home" directory
*/
i = libssh2_sftp_realpath(ssh->sftp_session, ".", tempHome, PATH_MAX-1);
if (i > 0) {
/* It seems that this string is not always NULL terminated */
tempHome[i] = '\0';
ssh->homedir = (char *)strdup(tempHome);
if (!ssh->homedir) {
libssh2_sftp_shutdown(ssh->sftp_session);
ssh->sftp_session = NULL;
libssh2_session_free(ssh->ssh_session);
ssh->ssh_session = NULL;
Curl_safefree(working_path);
return CURLE_OUT_OF_MEMORY;
}
}
else {
/* Return the error type */
i = libssh2_sftp_last_error(ssh->sftp_session);
DEBUGF(infof(data, "error = %d\n", i));
}
}
/* Check for /~/ , indicating relative to the user's home directory */
if (conn->protocol == PROT_SCP) {
real_path = (char *)malloc(working_path_len+1);
if (real_path == NULL) {
libssh2_session_free(ssh->ssh_session);
ssh->ssh_session = NULL;
Curl_safefree(working_path);
return CURLE_OUT_OF_MEMORY;
}
if (working_path[1] == '~')
/* It is referenced to the home directory, so strip the leading '/' */
memcpy(real_path, working_path+1, 1 + working_path_len-1);
else
memcpy(real_path, working_path, 1 + working_path_len);
}
else if (conn->protocol == PROT_SFTP) {
if (working_path[1] == '~') {
real_path = (char *)malloc(strlen(ssh->homedir) +
working_path_len + 1);
if (real_path == NULL) {
libssh2_sftp_shutdown(ssh->sftp_session);
ssh->sftp_session = NULL;
libssh2_session_free(ssh->ssh_session);
ssh->ssh_session = NULL;
Curl_safefree(ssh->homedir);
ssh->homedir = NULL;
Curl_safefree(working_path);
return CURLE_OUT_OF_MEMORY;
}
/* It is referenced to the home directory, so strip the leading '/' */
memcpy(real_path, ssh->homedir, strlen(ssh->homedir));
real_path[strlen(ssh->homedir)] = '/';
real_path[strlen(ssh->homedir)+1] = '\0';
if (working_path_len > 3) {
memcpy(real_path+strlen(ssh->homedir)+1, working_path + 3,
1 + working_path_len -3);
}
}
else {
real_path = (char *)malloc(working_path_len+1);
if (real_path == NULL) {
libssh2_sftp_shutdown(ssh->sftp_session);
ssh->sftp_session = NULL;
libssh2_session_free(ssh->ssh_session);
ssh->ssh_session = NULL;
Curl_safefree(ssh->homedir);
ssh->homedir = NULL;
Curl_safefree(working_path);
return CURLE_OUT_OF_MEMORY;
}
memcpy(real_path, working_path, 1+working_path_len);
}
}
else {
libssh2_session_free(ssh->ssh_session);
ssh->ssh_session = NULL;
Curl_safefree(working_path);
return CURLE_FAILED_INIT;
}
Curl_safefree(working_path);
ssh->path = real_path;
*done = TRUE;
return CURLE_OK;
}
CURLcode Curl_scp_do(struct connectdata *conn, bool *done)
{
struct stat sb;
struct SSHPROTO *scp = conn->data->reqdata.proto.ssh;
CURLcode res = CURLE_OK;
*done = TRUE; /* unconditionally */
if (conn->data->set.upload) {
/*
* NOTE!!! libssh2 requires that the destination path is a full path
* that includes the destination file and name OR ends in a "/" .
* If this is not done the destination file will be named the
* same name as the last directory in the path.
*/
scp->ssh_channel = libssh2_scp_send_ex(scp->ssh_session, scp->path,
LIBSSH2_SFTP_S_IRUSR|
LIBSSH2_SFTP_S_IWUSR|
LIBSSH2_SFTP_S_IRGRP|
LIBSSH2_SFTP_S_IROTH,
conn->data->set.infilesize, 0, 0);
if (!scp->ssh_channel)
return CURLE_FAILED_INIT;
/* upload data */
res = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, FIRSTSOCKET, NULL);
}
else {
/*
* We must check the remote file; if it is a directory no values will
* be set in sb
*/
curl_off_t bytecount;
memset(&sb, 0, sizeof(struct stat));
scp->ssh_channel = libssh2_scp_recv(scp->ssh_session, scp->path, &sb);
if (!scp->ssh_channel) {
if ((sb.st_mode == 0) && (sb.st_atime == 0) && (sb.st_mtime == 0) &&
(sb.st_size == 0)) {
/* Since sb is still empty, it is likely the file was not found */
return CURLE_REMOTE_FILE_NOT_FOUND;
}
return libssh2_session_error_to_CURLE(
libssh2_session_last_error(scp->ssh_session, NULL, NULL, 0));
}
/* download data */
bytecount = (curl_off_t) sb.st_size;
conn->data->reqdata.maxdownload = (curl_off_t) sb.st_size;
res = Curl_setup_transfer(conn, FIRSTSOCKET,
bytecount, FALSE, NULL, -1, NULL);
}
return res;
}
CURLcode Curl_scp_done(struct connectdata *conn, CURLcode status,
bool premature)
{
struct SSHPROTO *scp = conn->data->reqdata.proto.ssh;
(void)premature; /* not used */
Curl_safefree(scp->path);
scp->path = NULL;
if (scp->ssh_channel) {
if (conn->data->set.upload &&
libssh2_channel_send_eof(scp->ssh_channel) < 0) {
infof(conn->data, "Failed to send libssh2 channel EOF\n");
}
if (libssh2_channel_close(scp->ssh_channel) < 0) {
infof(conn->data, "Failed to stop libssh2 channel subsystem\n");
}
}
if (scp->ssh_session) {
libssh2_session_disconnect(scp->ssh_session, "Shutdown");
libssh2_session_free(scp->ssh_session);
scp->ssh_session = NULL;
}
free(conn->data->reqdata.proto.ssh);
conn->data->reqdata.proto.ssh = NULL;
Curl_pgrsDone(conn);
(void)status; /* unused */
return CURLE_OK;
}
/* return number of received (decrypted) bytes */
ssize_t Curl_scp_send(struct connectdata *conn, int sockindex,
void *mem, size_t len)
{
ssize_t nwrite;
/* libssh2_channel_write() returns int
*
* NOTE: we should not store nor rely on connection-related data to be
* in the SessionHandle struct
*/
#ifdef LIBSSH2CHANNEL_EAGAIN
nwrite = (ssize_t)
libssh2_channel_writenb(conn->data->reqdata.proto.ssh->ssh_channel,
mem, len);
#else
nwrite = (ssize_t)
libssh2_channel_write(conn->data->reqdata.proto.ssh->ssh_channel,
mem, len);
#endif
(void)sockindex;
return nwrite;
}
/*
* If the read would block (EWOULDBLOCK) we return -1. Otherwise we return
* a regular CURLcode value.
*/
ssize_t Curl_scp_recv(struct connectdata *conn, int sockindex,
char *mem, size_t len)
{
ssize_t nread;
(void)sockindex; /* we only support SCP on the fixed known primary socket */
/* libssh2_channel_read() returns int
*
* NOTE: we should not store nor rely on connection-related data to be
* in the SessionHandle struct
*/
#ifdef LIBSSH2CHANNEL_EAGAIN
/* we prefer the non-blocking API but that didn't exist previously */
nread = (ssize_t)
libssh2_channel_readnb(conn->data->reqdata.proto.ssh->ssh_channel,
mem, len);
#else
nread = (ssize_t)
libssh2_channel_read(conn->data->reqdata.proto.ssh->ssh_channel,
mem, len);
#endif
return nread;
}
/*
* =============== SFTP ===============
*/
CURLcode Curl_sftp_do(struct connectdata *conn, bool *done)
{
LIBSSH2_SFTP_ATTRIBUTES attrs;
struct SSHPROTO *sftp = conn->data->reqdata.proto.ssh;
CURLcode res = CURLE_OK;
struct SessionHandle *data = conn->data;
curl_off_t bytecount = 0;
char *buf = data->state.buffer;
unsigned long err = 0;
*done = TRUE; /* unconditionally */
if (data->set.upload) {
/*
* NOTE!!! libssh2 requires that the destination path is a full path
* that includes the destination file and name OR ends in a "/" .
* If this is not done the destination file will be named the
* same name as the last directory in the path.
*/
sftp->sftp_handle =
libssh2_sftp_open(sftp->sftp_session, sftp->path,
LIBSSH2_FXF_WRITE|LIBSSH2_FXF_CREAT,
LIBSSH2_SFTP_S_IRUSR|LIBSSH2_SFTP_S_IWUSR|
LIBSSH2_SFTP_S_IRGRP|LIBSSH2_SFTP_S_IROTH);
if (!sftp->sftp_handle) {
err = libssh2_sftp_last_error(sftp->sftp_session);
failf(conn->data, "Could not open remote file for writing: %s",
sftp_libssh2_strerror(err));
return sftp_libssh2_error_to_CURLE(err);
}
/* upload data */
res = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, FIRSTSOCKET, NULL);
}
else {
if (sftp->path[strlen(sftp->path)-1] == '/') {
/*
* This is a directory that we are trying to get, so produce a
* directory listing
*
* **BLOCKING behaviour** This should be made into a state machine and
* get a separate function called from Curl_sftp_recv() when there is
* data to read from the network, instead of "hanging" here.
*/
char filename[PATH_MAX+1];
int len, totalLen, currLen;
char *line;
sftp->sftp_handle =
libssh2_sftp_opendir(sftp->sftp_session, sftp->path);
if (!sftp->sftp_handle) {
err = libssh2_sftp_last_error(sftp->sftp_session);
failf(conn->data, "Could not open directory for reading: %s",
sftp_libssh2_strerror(err));
return sftp_libssh2_error_to_CURLE(err);
}
while ((len = libssh2_sftp_readdir(sftp->sftp_handle, filename,
PATH_MAX, &attrs)) > 0) {
filename[len] = '\0';
if (data->set.ftp_list_only) {
if ((attrs.flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) &&
((attrs.permissions & LIBSSH2_SFTP_S_IFMT) ==
LIBSSH2_SFTP_S_IFDIR)) {
infof(data, "%s\n", filename);
}
}
else {
totalLen = 80 + len;
line = (char *)malloc(totalLen);
if (!line)
return CURLE_OUT_OF_MEMORY;
if (!(attrs.flags & LIBSSH2_SFTP_ATTR_UIDGID))
attrs.uid = attrs.gid =0;
currLen = snprintf(line, totalLen, "---------- 1 %5d %5d",
attrs.uid, attrs.gid);
if (attrs.flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) {
if ((attrs.permissions & LIBSSH2_SFTP_S_IFMT) ==
LIBSSH2_SFTP_S_IFDIR) {
line[0] = 'd';
}
else if ((attrs.permissions & LIBSSH2_SFTP_S_IFMT) ==
LIBSSH2_SFTP_S_IFLNK) {
line[0] = 'l';
}
else if ((attrs.permissions & LIBSSH2_SFTP_S_IFMT) ==
LIBSSH2_SFTP_S_IFSOCK) {
line[0] = 's';
}
else if ((attrs.permissions & LIBSSH2_SFTP_S_IFMT) ==
LIBSSH2_SFTP_S_IFCHR) {
line[0] = 'c';
}
else if ((attrs.permissions & LIBSSH2_SFTP_S_IFMT) ==
LIBSSH2_SFTP_S_IFBLK) {
line[0] = 'b';
}
if (attrs.permissions & LIBSSH2_SFTP_S_IRUSR) {
line[1] = 'r';
}
if (attrs.permissions & LIBSSH2_SFTP_S_IWUSR) {
line[2] = 'w';
}
if (attrs.permissions & LIBSSH2_SFTP_S_IXUSR) {
line[3] = 'x';
}
if (attrs.permissions & LIBSSH2_SFTP_S_IRGRP) {
line[4] = 'r';
}
if (attrs.permissions & LIBSSH2_SFTP_S_IWGRP) {
line[5] = 'w';
}
if (attrs.permissions & LIBSSH2_SFTP_S_IXGRP) {
line[6] = 'x';
}
if (attrs.permissions & LIBSSH2_SFTP_S_IROTH) {
line[7] = 'r';
}
if (attrs.permissions & LIBSSH2_SFTP_S_IWOTH) {
line[8] = 'w';
}
if (attrs.permissions & LIBSSH2_SFTP_S_IXOTH) {
line[9] = 'x';
}
}
if (attrs.flags & LIBSSH2_SFTP_ATTR_SIZE) {
currLen += snprintf(line+currLen, totalLen-currLen, "%11lld",
attrs.filesize);
}
if (attrs.flags & LIBSSH2_SFTP_ATTR_ACMODTIME) {
static const char * const months[12] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
struct tm *nowParts;
time_t now, remoteTime;
now = time(NULL);
remoteTime = (time_t)attrs.mtime;
nowParts = localtime(&remoteTime);
if ((time_t)attrs.mtime > (now - (3600 * 24 * 180))) {
currLen += snprintf(line+currLen, totalLen-currLen,
" %s %2d %2d:%02d", months[nowParts->tm_mon],
nowParts->tm_mday, nowParts->tm_hour,
nowParts->tm_min);
}
else {
currLen += snprintf(line+currLen, totalLen-currLen,
" %s %2d %5d", months[nowParts->tm_mon],
nowParts->tm_mday, 1900+nowParts->tm_year);
}
}
currLen += snprintf(line+currLen, totalLen-currLen, " %s", filename);
if ((attrs.flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) &&
((attrs.permissions & LIBSSH2_SFTP_S_IFMT) ==
LIBSSH2_SFTP_S_IFLNK)) {
char linkPath[PATH_MAX + 1];
snprintf(linkPath, PATH_MAX, "%s%s", sftp->path, filename);
len = libssh2_sftp_readlink(sftp->sftp_session, linkPath, filename,
PATH_MAX);
line = realloc(line, totalLen + 4 + len);
if (!line)
return CURLE_OUT_OF_MEMORY;
currLen += snprintf(line+currLen, totalLen-currLen, " -> %s",
filename);
}
currLen += snprintf(line+currLen, totalLen-currLen, "\n");
res = Curl_client_write(conn, CLIENTWRITE_BODY, line, 0);
free(line);
}
}
libssh2_sftp_closedir(sftp->sftp_handle);
sftp->sftp_handle = NULL;
/* no data to transfer */
res = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
}
else {
/*
* Work on getting the specified file
*/
sftp->sftp_handle =
libssh2_sftp_open(sftp->sftp_session, sftp->path, LIBSSH2_FXF_READ,
LIBSSH2_SFTP_S_IRUSR|LIBSSH2_SFTP_S_IWUSR|
LIBSSH2_SFTP_S_IRGRP|LIBSSH2_SFTP_S_IROTH);
if (!sftp->sftp_handle) {
err = libssh2_sftp_last_error(sftp->sftp_session);
failf(conn->data, "Could not open remote file for reading: %s",
sftp_libssh2_strerror(err));
return sftp_libssh2_error_to_CURLE(err);
}
if (libssh2_sftp_stat(sftp->sftp_session, sftp->path, &attrs)) {
/*
* libssh2_sftp_open() didn't return an error, so maybe the server
* just doesn't support stat()
*/
data->reqdata.size = -1;
data->reqdata.maxdownload = -1;
}
else {
data->reqdata.size = attrs.filesize;
data->reqdata.maxdownload = attrs.filesize;
Curl_pgrsSetDownloadSize(data, attrs.filesize);
}
Curl_pgrsTime(data, TIMER_STARTTRANSFER);
/* Now download data. The libssh2 0.14 doesn't offer any way to do this
without using this BLOCKING approach, so here's room for improvement
once libssh2 can return EWOULDBLOCK to us. */
#if 0
/* code left here just because this is what this function will use the
day libssh2 is improved */
res = Curl_setup_transfer(conn, FIRSTSOCKET,
bytecount, FALSE, NULL, -1, NULL);
#endif
while (res == CURLE_OK) {
size_t nread;
/* NOTE: most *read() functions return ssize_t but this returns size_t
which normally is unsigned! */
nread = libssh2_sftp_read(data->reqdata.proto.ssh->sftp_handle,
buf, BUFSIZE-1);
if (nread > 0)
buf[nread] = 0;
/* this check can be changed to a <= 0 when nread is changed to a
signed variable type */
if ((nread == 0) || (nread == (size_t)~0))
break;
bytecount += nread;
res = Curl_client_write(conn, CLIENTWRITE_BODY, buf, nread);
if(res)
return res;
Curl_pgrsSetDownloadCounter(data, bytecount);
if(Curl_pgrsUpdate(conn))
res = CURLE_ABORTED_BY_CALLBACK;
else {
struct timeval now = Curl_tvnow();
res = Curl_speedcheck(data, now);
}
}
if(Curl_pgrsUpdate(conn))
res = CURLE_ABORTED_BY_CALLBACK;
/* no (more) data to transfer */
res = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
}
}
return res;
}
CURLcode Curl_sftp_done(struct connectdata *conn, CURLcode status,
bool premature)
{
struct SSHPROTO *sftp = conn->data->reqdata.proto.ssh;
CURLcode rc = CURLE_OK;
(void)premature; /* not used */
Curl_safefree(sftp->path);
sftp->path = NULL;
Curl_safefree(sftp->homedir);
sftp->homedir = NULL;
/* Before we shut down, see if there are any post-quote commands to send: */
if(!status && !premature && conn->data->set.postquote) {
rc = sftp_sendquote(conn, conn->data->set.postquote);
}
if (sftp->sftp_handle) {
if (libssh2_sftp_close(sftp->sftp_handle) < 0) {
infof(conn->data, "Failed to close libssh2 file\n");
}
}
if (sftp->sftp_session) {
if (libssh2_sftp_shutdown(sftp->sftp_session) < 0) {
infof(conn->data, "Failed to stop libssh2 sftp subsystem\n");
}
}
if (sftp->ssh_channel) {
if (libssh2_channel_close(sftp->ssh_channel) < 0) {
infof(conn->data, "Failed to stop libssh2 channel subsystem\n");
}
}
if (sftp->ssh_session) {
libssh2_session_disconnect(sftp->ssh_session, "Shutdown");
libssh2_session_free(sftp->ssh_session);
sftp->ssh_session = NULL;
}
free(conn->data->reqdata.proto.ssh);
conn->data->reqdata.proto.ssh = NULL;
Curl_pgrsDone(conn);
(void)status; /* unused */
return rc;
}
/* return number of received (decrypted) bytes */
ssize_t Curl_sftp_send(struct connectdata *conn, int sockindex,
void *mem, size_t len)
{
ssize_t nwrite; /* libssh2_sftp_write() used to return size_t in 0.14
but is changed to ssize_t in 0.15! */
#ifdef LIBSSH2SFTP_EAGAIN
/* we prefer the non-blocking API but that didn't exist previously */
nwrite = (ssize_t)
libssh2_sftp_writenb(conn->data->reqdata.proto.ssh->sftp_handle, mem, len);
#else
nwrite = (ssize_t)
libssh2_sftp_write(conn->data->reqdata.proto.ssh->sftp_handle, mem, len);
#endif
(void)sockindex;
return nwrite;
}
/* The get_pathname() function is being borrowed from OpenSSH sftp.c
version 4.6p1. */
/*
* Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
*
* 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.
*/
static int
get_pathname(const char **cpp, char **path)
{
const char *cp = *cpp, *end;
char quot;
u_int i, j;
const char *WHITESPACE = " \t\r\n";
cp += strspn(cp, WHITESPACE);
if (!*cp) {
*cpp = cp;
*path = NULL;
return CURLE_FTP_QUOTE_ERROR;
}
*path = malloc(strlen(cp) + 1);
if (*path == NULL)
return CURLE_OUT_OF_MEMORY;
/* Check for quoted filenames */
if (*cp == '\"' || *cp == '\'') {
quot = *cp++;
/* Search for terminating quote, unescape some chars */
for (i = j = 0; i <= strlen(cp); i++) {
if (cp[i] == quot) { /* Found quote */
i++;
(*path)[j] = '\0';
break;
}
if (cp[i] == '\0') { /* End of string */
/*error("Unterminated quote");*/
goto fail;
}
if (cp[i] == '\\') { /* Escaped characters */
i++;
if (cp[i] != '\'' && cp[i] != '\"' &&
cp[i] != '\\') {
/*error("Bad escaped character '\\%c'",
cp[i]);*/
goto fail;
}
}
(*path)[j++] = cp[i];
}
if (j == 0) {
/*error("Empty quotes");*/
goto fail;
}
*cpp = cp + i + strspn(cp + i, WHITESPACE);
}
else {
/* Read to end of filename */
end = strpbrk(cp, WHITESPACE);
if (end == NULL)
end = strchr(cp, '\0');
*cpp = end + strspn(end, WHITESPACE);
memcpy(*path, cp, end - cp);
(*path)[end - cp] = '\0';
}
return (0);
fail:
free(*path);
*path = NULL;
return CURLE_FTP_QUOTE_ERROR;
}
static const char *sftp_libssh2_strerror(unsigned long err)
{
switch (err) {
case LIBSSH2_FX_NO_SUCH_FILE:
return "No such file or directory";
case LIBSSH2_FX_PERMISSION_DENIED:
return "Permission denied";
case LIBSSH2_FX_FAILURE:
return "Operation failed";
case LIBSSH2_FX_BAD_MESSAGE:
return "Bad message from SFTP server";
case LIBSSH2_FX_NO_CONNECTION:
return "Not connected to SFTP server";
case LIBSSH2_FX_CONNECTION_LOST:
return "Connection to SFTP server lost";
case LIBSSH2_FX_OP_UNSUPPORTED:
return "Operation not supported by SFTP server";
case LIBSSH2_FX_INVALID_HANDLE:
return "Invalid handle";
case LIBSSH2_FX_NO_SUCH_PATH:
return "No such file or directory";
case LIBSSH2_FX_FILE_ALREADY_EXISTS:
return "File already exists";
case LIBSSH2_FX_WRITE_PROTECT:
return "File is write protected";
case LIBSSH2_FX_NO_MEDIA:
return "No media";
case LIBSSH2_FX_NO_SPACE_ON_FILESYSTEM:
return "Disk full";
case LIBSSH2_FX_QUOTA_EXCEEDED:
return "User quota exceeded";
case LIBSSH2_FX_UNKNOWN_PRINCIPLE:
return "Unknown principle";
case LIBSSH2_FX_LOCK_CONFlICT:
return "File lock conflict";
case LIBSSH2_FX_DIR_NOT_EMPTY:
return "Directory not empty";
case LIBSSH2_FX_NOT_A_DIRECTORY:
return "Not a directory";
case LIBSSH2_FX_INVALID_FILENAME:
return "Invalid filename";
case LIBSSH2_FX_LINK_LOOP:
return "Link points to itself";
}
return "Unknown error in libssh2";
}
/* BLOCKING */
static CURLcode sftp_sendquote(struct connectdata *conn,
struct curl_slist *quote)
{
struct curl_slist *item=quote;
const char *cp;
long err;
struct SessionHandle *data = conn->data;
LIBSSH2_SFTP *sftp_session = data->reqdata.proto.ssh->sftp_session;
while (item) {
if (item->data) {
char *path1 = NULL;
char *path2 = NULL;
/* the arguments following the command must be separated from the
command with a space so we can check for it unconditionally */
cp = strchr(item->data, ' ');
if (cp == NULL) {
failf(data, "Syntax error in SFTP command. Supply parameter(s)!");
return CURLE_FTP_QUOTE_ERROR;
}
/* also, every command takes at least one argument so we get that first
argument right now */
err = get_pathname(&cp, &path1);
if (err) {
if (err == CURLE_OUT_OF_MEMORY)
failf(data, "Out of memory");
else
failf(data, "Syntax error: Bad first parameter");
return err;
}
/* SFTP is a binary protocol, so we don't send text commands to the
server. Instead, we scan for commands for commands used by OpenSSH's
sftp program and call the appropriate libssh2 functions. */
if (curl_strnequal(item->data, "chgrp ", 6) ||
curl_strnequal(item->data, "chmod ", 6) ||
curl_strnequal(item->data, "chown ", 6) ) { /* attribute change */
LIBSSH2_SFTP_ATTRIBUTES attrs;
/* path1 contains the mode to set */
err = get_pathname(&cp, &path2); /* get the destination */
if (err) {
if (err == CURLE_OUT_OF_MEMORY)
failf(data, "Out of memory");
else
failf(data,
"Syntax error in chgrp/chmod/chown: Bad second parameter");
free(path1);
return err;
}
memset(&attrs, 0, sizeof(LIBSSH2_SFTP_ATTRIBUTES));
if (libssh2_sftp_stat(sftp_session,
path2, &attrs) != 0) { /* get those attributes */
err = libssh2_sftp_last_error(sftp_session);
free(path1);
free(path2);
failf(data, "Attempt to get SFTP stats failed: %s",
sftp_libssh2_strerror(err));
return CURLE_FTP_QUOTE_ERROR;
}
/* Now set the new attributes... */
if (curl_strnequal(item->data, "chgrp", 5)) {
attrs.gid = strtol(path1, NULL, 10);
if (attrs.gid == 0) {
free(path1);
free(path2);
failf(data, "Syntax error: chgrp gid not a number");
return CURLE_FTP_QUOTE_ERROR;
}
}
else if (curl_strnequal(item->data, "chmod", 5)) {
attrs.permissions = strtol(path1, NULL, 8);/* permissions are octal */
if (attrs.permissions == 0) {
free(path1);
free(path2);
failf(data, "Syntax error: chmod permissions not a number");
return CURLE_FTP_QUOTE_ERROR;
}
}
else if (curl_strnequal(item->data, "chown", 5)) {
attrs.uid = strtol(path1, NULL, 10);
if (attrs.uid == 0) {
free(path1);
free(path2);
failf(data, "Syntax error: chown uid not a number");
return CURLE_FTP_QUOTE_ERROR;
}
}
/* Now send the completed structure... */
if (libssh2_sftp_setstat(sftp_session, path2, &attrs) != 0) {
err = libssh2_sftp_last_error(sftp_session);
free(path1);
free(path2);
failf(data, "Attempt to set SFTP stats failed: %s",
sftp_libssh2_strerror(err));
return CURLE_FTP_QUOTE_ERROR;
}
}
else if (curl_strnequal(item->data, "ln ", 3) ||
curl_strnequal(item->data, "symlink ", 8)) {
/* symbolic linking */
/* path1 is the source */
err = get_pathname(&cp, &path2); /* get the destination */
if (err) {
if (err == CURLE_OUT_OF_MEMORY)
failf(data, "Out of memory");
else
failf(data,
"Syntax error in ln/symlink: Bad second parameter");
free(path1);
return err;
}
if (libssh2_sftp_symlink(sftp_session, path1, path2) != 0) {
err = libssh2_sftp_last_error(sftp_session);
free(path1);
free(path2);
failf(data, "symlink command failed: %s",
sftp_libssh2_strerror(err));
return CURLE_FTP_QUOTE_ERROR;
}
}
else if (curl_strnequal(item->data, "mkdir ", 6)) { /* create dir */
if (libssh2_sftp_mkdir(sftp_session, path1, 0744) != 0) {
err = libssh2_sftp_last_error(sftp_session);
free(path1);
failf(data, "mkdir command failed: %s",
sftp_libssh2_strerror(err));
return CURLE_FTP_QUOTE_ERROR;
}
}
else if (curl_strnequal(item->data, "rename ", 7)) { /* rename file */
/* first param is the source path */
err = get_pathname(&cp, &path2); /* second param is the dest. path */
if (err) {
if (err == CURLE_OUT_OF_MEMORY)
failf(data, "Out of memory");
else
failf(data,
"Syntax error in rename: Bad second parameter");
free(path1);
return err;
}
if (libssh2_sftp_rename(sftp_session,
path1, path2) != 0) {
err = libssh2_sftp_last_error(sftp_session);
free(path1);
free(path2);
failf(data, "rename command failed: %s",
sftp_libssh2_strerror(err));
return CURLE_FTP_QUOTE_ERROR;
}
}
else if (curl_strnequal(item->data, "rmdir ", 6)) { /* delete dir */
if (libssh2_sftp_rmdir(sftp_session,
path1) != 0) {
err = libssh2_sftp_last_error(sftp_session);
free(path1);
failf(data, "rmdir command failed: %s",
sftp_libssh2_strerror(err));
return CURLE_FTP_QUOTE_ERROR;
}
}
else if (curl_strnequal(item->data, "rm ", 3)) { /* delete file */
if (libssh2_sftp_unlink(sftp_session, path1) != 0) {
err = libssh2_sftp_last_error(sftp_session);
free(path1);
failf(data, "rm command failed: %s",
sftp_libssh2_strerror(err));
return CURLE_FTP_QUOTE_ERROR;
}
}
if (path1)
free(path1);
if (path2)
free(path2);
}
item = item->next;
}
return CURLE_OK;
}
/*
* If the read would block (EWOULDBLOCK) we return -1. Otherwise we return
* a regular CURLcode value.
*/
ssize_t Curl_sftp_recv(struct connectdata *conn, int sockindex,
char *mem, size_t len)
{
ssize_t nread;
(void)sockindex;
/* libssh2_sftp_read() returns size_t !*/
#ifdef LIBSSH2SFTP_EAGAIN
/* we prefer the non-blocking API but that didn't exist previously */
nread = (ssize_t)
libssh2_sftp_readnb(conn->data->reqdata.proto.ssh->sftp_handle, mem, len);
#else
nread = (ssize_t)
libssh2_sftp_read(conn->data->reqdata.proto.ssh->sftp_handle, mem, len);
#endif
return nread;
}
#endif /* USE_LIBSSH2 */
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