1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
|
#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.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#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_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 */
|
