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#ifndef HEADER_CURL_SSH_H
#define HEADER_CURL_SSH_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2022, 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 https://curl.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.
*
***************************************************************************/
#include "curl_setup.h"
#if defined(HAVE_LIBSSH2_H)
#error #include <libssh2.h>
#error #include <libssh2_sftp.h>
#elif defined(HAVE_LIBSSH_LIBSSH_H)
#error #include <libssh/libssh.h>
#error #include <libssh/sftp.h>
#elif defined(USE_WOLFSSH)
#error #include <wolfssh/ssh.h>
#error #include <wolfssh/wolfsftp.h>
#endif
/****************************************************************************
* SSH unique setup
***************************************************************************/
typedef enum {
SSH_NO_STATE = -1, /* Used for "nextState" so say there is none */
SSH_STOP = 0, /* do nothing state, stops the state machine */
SSH_INIT, /* First state in SSH-CONNECT */
SSH_S_STARTUP, /* Session startup */
SSH_HOSTKEY, /* verify hostkey */
SSH_AUTHLIST,
SSH_AUTH_PKEY_INIT,
SSH_AUTH_PKEY,
SSH_AUTH_PASS_INIT,
SSH_AUTH_PASS,
SSH_AUTH_AGENT_INIT, /* initialize then wait for connection to agent */
SSH_AUTH_AGENT_LIST, /* ask for list then wait for entire list to come */
SSH_AUTH_AGENT, /* attempt one key at a time */
SSH_AUTH_HOST_INIT,
SSH_AUTH_HOST,
SSH_AUTH_KEY_INIT,
SSH_AUTH_KEY,
SSH_AUTH_GSSAPI,
SSH_AUTH_DONE,
SSH_SFTP_INIT,
SSH_SFTP_REALPATH, /* Last state in SSH-CONNECT */
SSH_SFTP_QUOTE_INIT, /* First state in SFTP-DO */
SSH_SFTP_POSTQUOTE_INIT, /* (Possibly) First state in SFTP-DONE */
SSH_SFTP_QUOTE,
SSH_SFTP_NEXT_QUOTE,
SSH_SFTP_QUOTE_STAT,
SSH_SFTP_QUOTE_SETSTAT,
SSH_SFTP_QUOTE_SYMLINK,
SSH_SFTP_QUOTE_MKDIR,
SSH_SFTP_QUOTE_RENAME,
SSH_SFTP_QUOTE_RMDIR,
SSH_SFTP_QUOTE_UNLINK,
SSH_SFTP_QUOTE_STATVFS,
SSH_SFTP_GETINFO,
SSH_SFTP_FILETIME,
SSH_SFTP_TRANS_INIT,
SSH_SFTP_UPLOAD_INIT,
SSH_SFTP_CREATE_DIRS_INIT,
SSH_SFTP_CREATE_DIRS,
SSH_SFTP_CREATE_DIRS_MKDIR,
SSH_SFTP_READDIR_INIT,
SSH_SFTP_READDIR,
SSH_SFTP_READDIR_LINK,
SSH_SFTP_READDIR_BOTTOM,
SSH_SFTP_READDIR_DONE,
SSH_SFTP_DOWNLOAD_INIT,
SSH_SFTP_DOWNLOAD_STAT, /* Last state in SFTP-DO */
SSH_SFTP_CLOSE, /* Last state in SFTP-DONE */
SSH_SFTP_SHUTDOWN, /* First state in SFTP-DISCONNECT */
SSH_SCP_TRANS_INIT, /* First state in SCP-DO */
SSH_SCP_UPLOAD_INIT,
SSH_SCP_DOWNLOAD_INIT,
SSH_SCP_DOWNLOAD,
SSH_SCP_DONE,
SSH_SCP_SEND_EOF,
SSH_SCP_WAIT_EOF,
SSH_SCP_WAIT_CLOSE,
SSH_SCP_CHANNEL_FREE, /* Last state in SCP-DONE */
SSH_SESSION_DISCONNECT, /* First state in SCP-DISCONNECT */
SSH_SESSION_FREE, /* Last state in SCP/SFTP-DISCONNECT */
SSH_QUIT,
SSH_LAST /* never used */
} sshstate;
/* this struct is used in the HandleData struct which is part of the
Curl_easy, which means this is used on a per-easy handle basis.
Everything that is strictly related to a connection is banned from this
struct. */
struct SSHPROTO {
char *path; /* the path we operate on */
#ifdef USE_LIBSSH2
struct dynbuf readdir_link;
struct dynbuf readdir;
char *readdir_filename;
char *readdir_longentry;
LIBSSH2_SFTP_ATTRIBUTES quote_attrs; /* used by the SFTP_QUOTE state */
/* Here's a set of struct members used by the SFTP_READDIR state */
LIBSSH2_SFTP_ATTRIBUTES readdir_attrs;
#endif
};
/* ssh_conn is used for struct connection-oriented data in the connectdata
struct */
struct ssh_conn {
const char *authlist; /* List of auth. methods, managed by libssh2 */
/* common */
const char *passphrase; /* pass-phrase to use */
char *rsa_pub; /* strdup'ed public key file */
char *rsa; /* strdup'ed private key file */
bool authed; /* the connection has been authenticated fine */
bool acceptfail; /* used by the SFTP_QUOTE (continue if
quote command fails) */
sshstate state; /* always use ssh.c:state() to change state! */
sshstate nextstate; /* the state to goto after stopping */
CURLcode actualcode; /* the actual error code */
struct curl_slist *quote_item; /* for the quote option */
char *quote_path1; /* two generic pointers for the QUOTE stuff */
char *quote_path2;
char *homedir; /* when doing SFTP we figure out home dir in the
connect phase */
char *readdir_line;
/* end of READDIR stuff */
int secondCreateDirs; /* counter use by the code to see if the
second attempt has been made to change
to/create a directory */
int orig_waitfor; /* default READ/WRITE bits wait for */
char *slash_pos; /* used by the SFTP_CREATE_DIRS state */
#if defined(USE_LIBSSH)
char *readdir_linkPath;
size_t readdir_len, readdir_totalLen, readdir_currLen;
/* our variables */
unsigned kbd_state; /* 0 or 1 */
ssh_key privkey;
ssh_key pubkey;
int auth_methods;
ssh_session ssh_session;
ssh_scp scp_session;
sftp_session sftp_session;
sftp_file sftp_file;
sftp_dir sftp_dir;
unsigned sftp_recv_state; /* 0 or 1 */
int sftp_file_index; /* for async read */
sftp_attributes readdir_attrs; /* used by the SFTP readdir actions */
sftp_attributes readdir_link_attrs; /* used by the SFTP readdir actions */
sftp_attributes quote_attrs; /* used by the SFTP_QUOTE state */
const char *readdir_filename; /* points within readdir_attrs */
const char *readdir_longentry;
char *readdir_tmp;
#elif defined(USE_LIBSSH2)
LIBSSH2_SESSION *ssh_session; /* Secure Shell session */
LIBSSH2_CHANNEL *ssh_channel; /* Secure Shell channel handle */
LIBSSH2_SFTP *sftp_session; /* SFTP handle */
LIBSSH2_SFTP_HANDLE *sftp_handle;
#ifndef CURL_DISABLE_PROXY
/* for HTTPS proxy storage */
Curl_recv *tls_recv;
Curl_send *tls_send;
#endif
#ifdef HAVE_LIBSSH2_AGENT_API
LIBSSH2_AGENT *ssh_agent; /* proxy to ssh-agent/pageant */
struct libssh2_agent_publickey *sshagent_identity,
*sshagent_prev_identity;
#endif
/* note that HAVE_LIBSSH2_KNOWNHOST_API is a define set in the libssh2.h
header */
#ifdef HAVE_LIBSSH2_KNOWNHOST_API
LIBSSH2_KNOWNHOSTS *kh;
#endif
#elif defined(USE_WOLFSSH)
WOLFSSH *ssh_session;
WOLFSSH_CTX *ctx;
word32 handleSz;
byte handle[WOLFSSH_MAX_HANDLE];
curl_off_t offset;
#endif /* USE_LIBSSH */
};
#if defined(USE_LIBSSH)
#define CURL_LIBSSH_VERSION ssh_version(0)
#elif defined(USE_LIBSSH2)
/* Feature detection based on version numbers to better work with
non-configure platforms */
#if !defined(LIBSSH2_VERSION_NUM) || (LIBSSH2_VERSION_NUM < 0x001000)
# error "SCP/SFTP protocols require libssh2 0.16 or later"
#endif
#if LIBSSH2_VERSION_NUM >= 0x010000
#define HAVE_LIBSSH2_SFTP_SEEK64 1
#endif
#if LIBSSH2_VERSION_NUM >= 0x010100
#define HAVE_LIBSSH2_VERSION 1
#endif
#if LIBSSH2_VERSION_NUM >= 0x010205
#define HAVE_LIBSSH2_INIT 1
#define HAVE_LIBSSH2_EXIT 1
#endif
#if LIBSSH2_VERSION_NUM >= 0x010206
#define HAVE_LIBSSH2_KNOWNHOST_CHECKP 1
#define HAVE_LIBSSH2_SCP_SEND64 1
#endif
#if LIBSSH2_VERSION_NUM >= 0x010208
#define HAVE_LIBSSH2_SESSION_HANDSHAKE 1
#endif
#ifdef HAVE_LIBSSH2_VERSION
/* get it run-time if possible */
#define CURL_LIBSSH2_VERSION libssh2_version(0)
#else
/* use build-time if run-time not possible */
#define CURL_LIBSSH2_VERSION LIBSSH2_VERSION
#endif
#endif /* USE_LIBSSH2 */
#ifdef USE_SSH
extern const struct Curl_handler Curl_handler_scp;
extern const struct Curl_handler Curl_handler_sftp;
/* generic SSH backend functions */
CURLcode Curl_ssh_init(void);
void Curl_ssh_cleanup(void);
void Curl_ssh_version(char *buffer, size_t buflen);
void Curl_ssh_attach(struct Curl_easy *data,
struct connectdata *conn);
#else
/* for non-SSH builds */
#define Curl_ssh_cleanup()
#define Curl_ssh_attach(x,y)
#endif
#endif /* HEADER_CURL_SSH_H */
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