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