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libssh.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Red Hat, Inc.
*
* Authors: Nikos Mavrogiannopoulos, Tomas Mraz, Stanislav Zidek,
* Robert Kolcun, Andreas Schneider
*
* 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"
#ifdef USE_LIBSSH
#include <limits.h>
#include <libssh/libssh.h>
#include <libssh/sftp.h>
#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
#include <curl/curl.h>
#include "urldata.h"
#include "sendf.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 "strdup.h"
#include "strcase.h"
#include "vtls/vtls.h"
#include "cfilters.h"
#include "connect.h"
#include "inet_ntop.h"
#include "parsedate.h" /* for the week day and month names */
#include "sockaddr.h" /* required for Curl_sockaddr_storage */
#include "strtoofft.h"
#include "multiif.h"
#include "select.h"
#include "warnless.h"
#include "curl_path.h"
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
/* in 0.10.0 or later, ignore deprecated warnings */
#if defined(__GNUC__) && \
(LIBSSH_VERSION_MINOR >= 10) || \
(LIBSSH_VERSION_MAJOR > 0)
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
/* A recent macro provided by libssh. Or make our own. */
#ifndef SSH_STRING_FREE_CHAR
#define SSH_STRING_FREE_CHAR(x) \
do { \
if(x) { \
ssh_string_free_char(x); \
x = NULL; \
} \
} while(0)
#endif
/* These stat values may not be the same as the user's S_IFMT / S_IFLNK */
#ifndef SSH_S_IFMT
#define SSH_S_IFMT 00170000
#endif
#ifndef SSH_S_IFLNK
#define SSH_S_IFLNK 0120000
#endif
/* Local functions: */
static CURLcode myssh_connect(struct Curl_easy *data, bool *done);
static CURLcode myssh_multi_statemach(struct Curl_easy *data,
bool *done);
static CURLcode myssh_do_it(struct Curl_easy *data, bool *done);
static CURLcode scp_done(struct Curl_easy *data,
CURLcode, bool premature);
static CURLcode scp_doing(struct Curl_easy *data, bool *dophase_done);
static CURLcode scp_disconnect(struct Curl_easy *data,
struct connectdata *conn,
bool dead_connection);
static CURLcode sftp_done(struct Curl_easy *data,
CURLcode, bool premature);
static CURLcode sftp_doing(struct Curl_easy *data,
bool *dophase_done);
static CURLcode sftp_disconnect(struct Curl_easy *data,
struct connectdata *conn,
bool dead);
static
CURLcode sftp_perform(struct Curl_easy *data,
bool *connected,
bool *dophase_done);
static void sftp_quote(struct Curl_easy *data);
static void sftp_quote_stat(struct Curl_easy *data);
static int myssh_getsock(struct Curl_easy *data,
struct connectdata *conn, curl_socket_t *sock);
static CURLcode myssh_setup_connection(struct Curl_easy *data,
struct connectdata *conn);
/*
* SCP protocol handler.
*/
const struct Curl_handler Curl_handler_scp = {
"SCP", /* scheme */
myssh_setup_connection, /* setup_connection */
myssh_do_it, /* do_it */
scp_done, /* done */
ZERO_NULL, /* do_more */
myssh_connect, /* connect_it */
myssh_multi_statemach, /* connecting */
scp_doing, /* doing */
myssh_getsock, /* proto_getsock */
myssh_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
myssh_getsock, /* perform_getsock */
scp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
ZERO_NULL, /* attach connection */
PORT_SSH, /* defport */
CURLPROTO_SCP, /* protocol */
CURLPROTO_SCP, /* family */
PROTOPT_DIRLOCK | PROTOPT_CLOSEACTION | PROTOPT_NOURLQUERY /* flags */
};
/*
* SFTP protocol handler.
*/
const struct Curl_handler Curl_handler_sftp = {
"SFTP", /* scheme */
myssh_setup_connection, /* setup_connection */
myssh_do_it, /* do_it */
sftp_done, /* done */
ZERO_NULL, /* do_more */
myssh_connect, /* connect_it */
myssh_multi_statemach, /* connecting */
sftp_doing, /* doing */
myssh_getsock, /* proto_getsock */
myssh_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
myssh_getsock, /* perform_getsock */
sftp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
ZERO_NULL, /* attach connection */
PORT_SSH, /* defport */
CURLPROTO_SFTP, /* protocol */
CURLPROTO_SFTP, /* family */
PROTOPT_DIRLOCK | PROTOPT_CLOSEACTION
| PROTOPT_NOURLQUERY /* flags */
};
static CURLcode sftp_error_to_CURLE(int err)
{
switch(err) {
case SSH_FX_OK:
return CURLE_OK;
case SSH_FX_NO_SUCH_FILE:
case SSH_FX_NO_SUCH_PATH:
return CURLE_REMOTE_FILE_NOT_FOUND;
case SSH_FX_PERMISSION_DENIED:
case SSH_FX_WRITE_PROTECT:
return CURLE_REMOTE_ACCESS_DENIED;
case SSH_FX_FILE_ALREADY_EXISTS:
return CURLE_REMOTE_FILE_EXISTS;
default:
break;
}
return CURLE_SSH;
}
#ifndef DEBUGBUILD
#define state(x,y) mystate(x,y)
#else
#define state(x,y) mystate(x,y, __LINE__)
#endif
/*
* SSH State machine related code
*/
/* This is the ONLY way to change SSH state! */
static void mystate(struct Curl_easy *data, sshstate nowstate
#ifdef DEBUGBUILD
, int lineno
#endif
)
{
struct connectdata *conn = data->conn;
struct ssh_conn *sshc = &conn->proto.sshc;
#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
/* for debug purposes */
static const char *const names[] = {
"SSH_STOP",
"SSH_INIT",
"SSH_S_STARTUP",
"SSH_HOSTKEY",
"SSH_AUTHLIST",
"SSH_AUTH_PKEY_INIT",
"SSH_AUTH_PKEY",
"SSH_AUTH_PASS_INIT",
"SSH_AUTH_PASS",
"SSH_AUTH_AGENT_INIT",
"SSH_AUTH_AGENT_LIST",
"SSH_AUTH_AGENT",
"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",
"SSH_SFTP_QUOTE_INIT",
"SSH_SFTP_POSTQUOTE_INIT",
"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",
"SSH_SFTP_CLOSE",
"SSH_SFTP_SHUTDOWN",
"SSH_SCP_TRANS_INIT",
"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",
"SSH_SESSION_DISCONNECT",
"SSH_SESSION_FREE",
"QUIT"
};
if(sshc->state != nowstate) {
infof(data, "SSH %p state change from %s to %s (line %d)",
(void *) sshc, names[sshc->state], names[nowstate],
lineno);
}
#endif
sshc->state = nowstate;
}
/* Multiple options:
* 1. data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5] is set with an MD5
* hash (90s style auth, not sure we should have it here)
* 2. data->set.ssh_keyfunc callback is set. Then we do trust on first
* use. We even save on knownhosts if CURLKHSTAT_FINE_ADD_TO_FILE
* is returned by it.
* 3. none of the above. We only accept if it is present on known hosts.
*
* Returns SSH_OK or SSH_ERROR.
*/
static int myssh_is_known(struct Curl_easy *data)
{
int rc;
struct connectdata *conn = data->conn;
struct ssh_conn *sshc = &conn->proto.sshc;
ssh_key pubkey;
size_t hlen;
unsigned char *hash = NULL;
char *found_base64 = NULL;
char *known_base64 = NULL;
int vstate;
enum curl_khmatch keymatch;
struct curl_khkey foundkey;
struct curl_khkey *knownkeyp = NULL;
curl_sshkeycallback func =
data->set.ssh_keyfunc;
#if LIBSSH_VERSION_INT >= SSH_VERSION_INT(0,9,0)
struct ssh_knownhosts_entry *knownhostsentry = NULL;
struct curl_khkey knownkey;
#endif
#if LIBSSH_VERSION_INT >= SSH_VERSION_INT(0,8,0)
rc = ssh_get_server_publickey(sshc->ssh_session, &pubkey);
#else
rc = ssh_get_publickey(sshc->ssh_session, &pubkey);
#endif
if(rc != SSH_OK)
return rc;
if(data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5]) {
int i;
char md5buffer[33];
const char *pubkey_md5 = data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5];
rc = ssh_get_publickey_hash(pubkey, SSH_PUBLICKEY_HASH_MD5,
&hash, &hlen);
if(rc != SSH_OK || hlen != 16) {
failf(data,
"Denied establishing ssh session: md5 fingerprint not available");
goto cleanup;
}
for(i = 0; i < 16; i++)
msnprintf(&md5buffer[i*2], 3, "%02x", (unsigned char)hash[i]);
infof(data, "SSH MD5 fingerprint: %s", md5buffer);
if(!strcasecompare(md5buffer, pubkey_md5)) {
failf(data,
"Denied establishing ssh session: mismatch md5 fingerprint. "
"Remote %s is not equal to %s", md5buffer, pubkey_md5);
rc = SSH_ERROR;
goto cleanup;
}
rc = SSH_OK;
goto cleanup;
}
if(data->set.ssl.primary.verifyhost != TRUE) {
rc = SSH_OK;
goto cleanup;
}
#if LIBSSH_VERSION_INT >= SSH_VERSION_INT(0,9,0)
/* Get the known_key from the known hosts file */
vstate = ssh_session_get_known_hosts_entry(sshc->ssh_session,
&knownhostsentry);
/* Case an entry was found in a known hosts file */
if(knownhostsentry) {
if(knownhostsentry->publickey) {
rc = ssh_pki_export_pubkey_base64(knownhostsentry->publickey,
&known_base64);
if(rc != SSH_OK) {
goto cleanup;
}
knownkey.key = known_base64;
knownkey.len = strlen(known_base64);
switch(ssh_key_type(knownhostsentry->publickey)) {
case SSH_KEYTYPE_RSA:
knownkey.keytype = CURLKHTYPE_RSA;
break;
case SSH_KEYTYPE_RSA1:
knownkey.keytype = CURLKHTYPE_RSA1;
break;
case SSH_KEYTYPE_ECDSA:
case SSH_KEYTYPE_ECDSA_P256:
case SSH_KEYTYPE_ECDSA_P384:
case SSH_KEYTYPE_ECDSA_P521:
knownkey.keytype = CURLKHTYPE_ECDSA;
break;
case SSH_KEYTYPE_ED25519:
knownkey.keytype = CURLKHTYPE_ED25519;
break;
case SSH_KEYTYPE_DSS:
knownkey.keytype = CURLKHTYPE_DSS;
break;
default:
rc = SSH_ERROR;
goto cleanup;
}
knownkeyp = &knownkey;
}
}
switch(vstate) {
case SSH_KNOWN_HOSTS_OK:
keymatch = CURLKHMATCH_OK;
break;
case SSH_KNOWN_HOSTS_OTHER:
/* fallthrough */
case SSH_KNOWN_HOSTS_NOT_FOUND:
/* fallthrough */
case SSH_KNOWN_HOSTS_UNKNOWN:
/* fallthrough */
case SSH_KNOWN_HOSTS_ERROR:
keymatch = CURLKHMATCH_MISSING;
break;
default:
keymatch = CURLKHMATCH_MISMATCH;
break;
}
#else
vstate = ssh_is_server_known(sshc->ssh_session);
switch(vstate) {
case SSH_SERVER_KNOWN_OK:
keymatch = CURLKHMATCH_OK;
break;
case SSH_SERVER_FILE_NOT_FOUND:
/* fallthrough */
case SSH_SERVER_NOT_KNOWN:
keymatch = CURLKHMATCH_MISSING;
break;
default:
keymatch = CURLKHMATCH_MISMATCH;
break;
}
#endif
if(func) { /* use callback to determine action */
rc = ssh_pki_export_pubkey_base64(pubkey, &found_base64);
if(rc != SSH_OK)
goto cleanup;
foundkey.key = found_base64;
foundkey.len = strlen(found_base64);
switch(ssh_key_type(pubkey)) {
case SSH_KEYTYPE_RSA:
foundkey.keytype = CURLKHTYPE_RSA;
break;
case SSH_KEYTYPE_RSA1:
foundkey.keytype = CURLKHTYPE_RSA1;
break;
case SSH_KEYTYPE_ECDSA:
#if LIBSSH_VERSION_INT >= SSH_VERSION_INT(0,9,0)
case SSH_KEYTYPE_ECDSA_P256:
case SSH_KEYTYPE_ECDSA_P384:
case SSH_KEYTYPE_ECDSA_P521:
#endif
foundkey.keytype = CURLKHTYPE_ECDSA;
break;
#if LIBSSH_VERSION_INT >= SSH_VERSION_INT(0,7,0)
case SSH_KEYTYPE_ED25519:
foundkey.keytype = CURLKHTYPE_ED25519;
break;
#endif
case SSH_KEYTYPE_DSS:
foundkey.keytype = CURLKHTYPE_DSS;
break;
default:
rc = SSH_ERROR;
goto cleanup;
}
Curl_set_in_callback(data, true);
rc = func(data, knownkeyp, /* from the knownhosts file */
&foundkey, /* from the remote host */
keymatch, data->set.ssh_keyfunc_userp);
Curl_set_in_callback(data, false);
switch(rc) {
case CURLKHSTAT_FINE_ADD_TO_FILE:
#if LIBSSH_VERSION_INT >= SSH_VERSION_INT(0,8,0)
rc = ssh_session_update_known_hosts(sshc->ssh_session);
#else
rc = ssh_write_knownhost(sshc->ssh_session);
#endif
if(rc != SSH_OK) {
goto cleanup;
}
break;
case CURLKHSTAT_FINE:
break;
default: /* REJECT/DEFER */
rc = SSH_ERROR;
goto cleanup;
}
}
else {
if(keymatch != CURLKHMATCH_OK) {
rc = SSH_ERROR;
goto cleanup;
}
}
rc = SSH_OK;
cleanup:
if(found_base64) {
(free)(found_base64);
}
if(known_base64) {
(free)(known_base64);
}
if(hash)
ssh_clean_pubkey_hash(&hash);
ssh_key_free(pubkey);
#if LIBSSH_VERSION_INT >= SSH_VERSION_INT(0,9,0)
if(knownhostsentry) {
ssh_knownhosts_entry_free(knownhostsentry);
}
#endif
return rc;
}
#define MOVE_TO_ERROR_STATE(_r) do { \
state(data, SSH_SESSION_DISCONNECT); \
sshc->actualcode = _r; \
rc = SSH_ERROR; \
} while(0)
#define MOVE_TO_SFTP_CLOSE_STATE() do { \
state(data, SSH_SFTP_CLOSE); \
sshc->actualcode = \
sftp_error_to_CURLE(sftp_get_error(sshc->sftp_session)); \
rc = SSH_ERROR; \
} while(0)
#define MOVE_TO_LAST_AUTH do { \
if(sshc->auth_methods & SSH_AUTH_METHOD_PASSWORD) { \
rc = SSH_OK; \
state(data, SSH_AUTH_PASS_INIT); \
} \
else { \
MOVE_TO_ERROR_STATE(CURLE_LOGIN_DENIED); \
} \
} while(0)
#define MOVE_TO_TERTIARY_AUTH do { \
if(sshc->auth_methods & SSH_AUTH_METHOD_INTERACTIVE) { \
rc = SSH_OK; \
state(data, SSH_AUTH_KEY_INIT); \
} \
else { \
MOVE_TO_LAST_AUTH; \
} \
} while(0)
#define MOVE_TO_SECONDARY_AUTH do { \
if(sshc->auth_methods & SSH_AUTH_METHOD_GSSAPI_MIC) { \
rc = SSH_OK; \
state(data, SSH_AUTH_GSSAPI); \
} \
else { \
MOVE_TO_TERTIARY_AUTH; \
} \
} while(0)
static
int myssh_auth_interactive(struct connectdata *conn)
{
int rc;
struct ssh_conn *sshc = &conn->proto.sshc;
int nprompts;
restart:
switch(sshc->kbd_state) {
case 0:
rc = ssh_userauth_kbdint(sshc->ssh_session, NULL, NULL);
if(rc == SSH_AUTH_AGAIN)
return SSH_AGAIN;
if(rc != SSH_AUTH_INFO)
return SSH_ERROR;
nprompts = ssh_userauth_kbdint_getnprompts(sshc->ssh_session);
if(nprompts != 1)
return SSH_ERROR;
rc = ssh_userauth_kbdint_setanswer(sshc->ssh_session, 0, conn->passwd);
if(rc < 0)
return SSH_ERROR;
/* FALLTHROUGH */
case 1:
sshc->kbd_state = 1;
rc = ssh_userauth_kbdint(sshc->ssh_session, NULL, NULL);
if(rc == SSH_AUTH_AGAIN)
return SSH_AGAIN;
else if(rc == SSH_AUTH_SUCCESS)
rc = SSH_OK;
else if(rc == SSH_AUTH_INFO) {
nprompts = ssh_userauth_kbdint_getnprompts(sshc->ssh_session);
if(nprompts)
return SSH_ERROR;
sshc->kbd_state = 2;
goto restart;
}
else
rc = SSH_ERROR;
break;
case 2:
sshc->kbd_state = 2;
rc = ssh_userauth_kbdint(sshc->ssh_session, NULL, NULL);
if(rc == SSH_AUTH_AGAIN)
return SSH_AGAIN;
else if(rc == SSH_AUTH_SUCCESS)
rc = SSH_OK;
else
rc = SSH_ERROR;
break;
default:
return SSH_ERROR;
}
sshc->kbd_state = 0;
return rc;
}
/*
* ssh_statemach_act() runs the SSH state machine as far as it can without
* blocking and without reaching the end. The data the pointer 'block' points
* to will be set to TRUE if the libssh function returns SSH_AGAIN
* meaning it wants to be called again when the socket is ready
*/
static CURLcode myssh_statemach_act(struct Curl_easy *data, bool *block)
{
CURLcode result = CURLE_OK;
struct connectdata *conn = data->conn;
struct SSHPROTO *protop = data->req.p.ssh;
struct ssh_conn *sshc = &conn->proto.sshc;
curl_socket_t sock = conn->sock[FIRSTSOCKET];
int rc = SSH_NO_ERROR, err;
char *new_readdir_line;
int seekerr = CURL_SEEKFUNC_OK;
const char *err_msg;
*block = 0; /* we're not blocking by default */
do {
switch(sshc->state) {
case SSH_INIT:
sshc->secondCreateDirs = 0;
sshc->nextstate = SSH_NO_STATE;
sshc->actualcode = CURLE_OK;
#if 0
ssh_set_log_level(SSH_LOG_PROTOCOL);
#endif
/* Set libssh to non-blocking, since everything internally is
non-blocking */
ssh_set_blocking(sshc->ssh_session, 0);
state(data, SSH_S_STARTUP);
/* FALLTHROUGH */
case SSH_S_STARTUP:
rc = ssh_connect(sshc->ssh_session);
if(rc == SSH_AGAIN)
break;
if(rc != SSH_OK) {
failf(data, "Failure establishing ssh session");
MOVE_TO_ERROR_STATE(CURLE_FAILED_INIT);
break;
}
state(data, SSH_HOSTKEY);
/* FALLTHROUGH */
case SSH_HOSTKEY:
rc = myssh_is_known(data);
if(rc != SSH_OK) {
MOVE_TO_ERROR_STATE(CURLE_PEER_FAILED_VERIFICATION);
break;
}
state(data, SSH_AUTHLIST);
/* FALLTHROUGH */
case SSH_AUTHLIST:{
sshc->authed = FALSE;
rc = ssh_userauth_none(sshc->ssh_session, NULL);
if(rc == SSH_AUTH_AGAIN) {
rc = SSH_AGAIN;
break;
}
if(rc == SSH_AUTH_SUCCESS) {
sshc->authed = TRUE;
infof(data, "Authenticated with none");
state(data, SSH_AUTH_DONE);
break;
}
else if(rc == SSH_AUTH_ERROR) {
MOVE_TO_ERROR_STATE(CURLE_LOGIN_DENIED);
break;
}
sshc->auth_methods = ssh_userauth_list(sshc->ssh_session, NULL);
if(sshc->auth_methods & SSH_AUTH_METHOD_PUBLICKEY) {
state(data, SSH_AUTH_PKEY_INIT);
infof(data, "Authentication using SSH public key file");
}
else if(sshc->auth_methods & SSH_AUTH_METHOD_GSSAPI_MIC) {
state(data, SSH_AUTH_GSSAPI);
}
else if(sshc->auth_methods & SSH_AUTH_METHOD_INTERACTIVE) {
state(data, SSH_AUTH_KEY_INIT);
}
else if(sshc->auth_methods & SSH_AUTH_METHOD_PASSWORD) {
state(data, SSH_AUTH_PASS_INIT);
}
else { /* unsupported authentication method */
MOVE_TO_ERROR_STATE(CURLE_LOGIN_DENIED);
break;
}
break;
}
case SSH_AUTH_PKEY_INIT:
if(!(data->set.ssh_auth_types & CURLSSH_AUTH_PUBLICKEY)) {
MOVE_TO_SECONDARY_AUTH;
break;
}
/* Two choices, (1) private key was given on CMD,
* (2) use the "default" keys. */
if(data->set.str[STRING_SSH_PRIVATE_KEY]) {
if(sshc->pubkey && !data->set.ssl.key_passwd) {
rc = ssh_userauth_try_publickey(sshc->ssh_session, NULL,
sshc->pubkey);
if(rc == SSH_AUTH_AGAIN) {
rc = SSH_AGAIN;
break;
}
if(rc != SSH_OK) {
MOVE_TO_SECONDARY_AUTH;
break;
}
}
rc = ssh_pki_import_privkey_file(data->
set.str[STRING_SSH_PRIVATE_KEY],
data->set.ssl.key_passwd, NULL,
NULL, &sshc->privkey);
if(rc != SSH_OK) {
failf(data, "Could not load private key file %s",
data->set.str[STRING_SSH_PRIVATE_KEY]);
MOVE_TO_ERROR_STATE(CURLE_LOGIN_DENIED);
break;
}
state(data, SSH_AUTH_PKEY);
break;
}
else {
rc = ssh_userauth_publickey_auto(sshc->ssh_session, NULL,
data->set.ssl.key_passwd);
if(rc == SSH_AUTH_AGAIN) {
rc = SSH_AGAIN;
break;
}
if(rc == SSH_AUTH_SUCCESS) {
rc = SSH_OK;
sshc->authed = TRUE;
infof(data, "Completed public key authentication");
state(data, SSH_AUTH_DONE);
break;
}
MOVE_TO_SECONDARY_AUTH;
}
break;
case SSH_AUTH_PKEY:
rc = ssh_userauth_publickey(sshc->ssh_session, NULL, sshc->privkey);
if(rc == SSH_AUTH_AGAIN) {
rc = SSH_AGAIN;
break;
}
if(rc == SSH_AUTH_SUCCESS) {
sshc->authed = TRUE;
infof(data, "Completed public key authentication");
state(data, SSH_AUTH_DONE);
break;
}
else {
infof(data, "Failed public key authentication (rc: %d)", rc);
MOVE_TO_SECONDARY_AUTH;
}
break;
case SSH_AUTH_GSSAPI:
if(!(data->set.ssh_auth_types & CURLSSH_AUTH_GSSAPI)) {
MOVE_TO_TERTIARY_AUTH;
break;
}
rc = ssh_userauth_gssapi(sshc->ssh_session);
if(rc == SSH_AUTH_AGAIN) {
rc = SSH_AGAIN;
break;
}
if(rc == SSH_AUTH_SUCCESS) {
rc = SSH_OK;
sshc->authed = TRUE;
infof(data, "Completed gssapi authentication");
state(data, SSH_AUTH_DONE);
break;
}
MOVE_TO_TERTIARY_AUTH;
break;
case SSH_AUTH_KEY_INIT:
if(data->set.ssh_auth_types & CURLSSH_AUTH_KEYBOARD) {
state(data, SSH_AUTH_KEY);
}
else {
MOVE_TO_LAST_AUTH;
}
break;
case SSH_AUTH_KEY:
/* Authentication failed. Continue with keyboard-interactive now. */
rc = myssh_auth_interactive(conn);
if(rc == SSH_AGAIN) {
break;
}
if(rc == SSH_OK) {
sshc->authed = TRUE;
infof(data, "completed keyboard interactive authentication");
}
state(data, SSH_AUTH_DONE);
break;
case SSH_AUTH_PASS_INIT:
if(!(data->set.ssh_auth_types & CURLSSH_AUTH_PASSWORD)) {
/* Host key authentication is intentionally not implemented */
MOVE_TO_ERROR_STATE(CURLE_LOGIN_DENIED);
break;
}
state(data, SSH_AUTH_PASS);
/* FALLTHROUGH */
case SSH_AUTH_PASS:
rc = ssh_userauth_password(sshc->ssh_session, NULL, conn->passwd);
if(rc == SSH_AUTH_AGAIN) {
rc = SSH_AGAIN;
break;
}
if(rc == SSH_AUTH_SUCCESS) {
sshc->authed = TRUE;
infof(data, "Completed password authentication");
state(data, SSH_AUTH_DONE);
}
else {
MOVE_TO_ERROR_STATE(CURLE_LOGIN_DENIED);
}
break;
case SSH_AUTH_DONE:
if(!sshc->authed) {
failf(data, "Authentication failure");
MOVE_TO_ERROR_STATE(CURLE_LOGIN_DENIED);
break;
}
/*
* At this point we have an authenticated ssh session.
*/
infof(data, "Authentication complete");
Curl_pgrsTime(data, TIMER_APPCONNECT); /* SSH is connected */
conn->sockfd = sock;
conn->writesockfd = CURL_SOCKET_BAD;
if(conn->handler->protocol == CURLPROTO_SFTP) {
state(data, SSH_SFTP_INIT);
break;
}
infof(data, "SSH CONNECT phase done");
state(data, SSH_STOP);
break;
case SSH_SFTP_INIT:
ssh_set_blocking(sshc->ssh_session, 1);
sshc->sftp_session = sftp_new(sshc->ssh_session);
if(!sshc->sftp_session) {
failf(data, "Failure initializing sftp session: %s",
ssh_get_error(sshc->ssh_session));
MOVE_TO_ERROR_STATE(CURLE_COULDNT_CONNECT);
break;
}
rc = sftp_init(sshc->sftp_session);
if(rc != SSH_OK) {
failf(data, "Failure initializing sftp session: %s",
ssh_get_error(sshc->ssh_session));
MOVE_TO_ERROR_STATE(sftp_error_to_CURLE(SSH_FX_FAILURE));
break;
}
state(data, SSH_SFTP_REALPATH);
/* FALLTHROUGH */
case SSH_SFTP_REALPATH:
/*
* Get the "home" directory
*/
sshc->homedir = sftp_canonicalize_path(sshc->sftp_session, ".");
if(!sshc->homedir) {
MOVE_TO_ERROR_STATE(CURLE_COULDNT_CONNECT);
break;
}
data->state.most_recent_ftp_entrypath = sshc->homedir;
/* This is the last step in the SFTP connect phase. Do note that while
we get the homedir here, we get the "workingpath" in the DO action
since the homedir will remain the same between request but the
working path will not. */
DEBUGF(infof(data, "SSH CONNECT phase done"));
state(data, SSH_STOP);
break;
case SSH_SFTP_QUOTE_INIT:
result = Curl_getworkingpath(data, sshc->homedir, &protop->path);
if(result) {
sshc->actualcode = result;
state(data, SSH_STOP);
break;
}
if(data->set.quote) {
infof(data, "Sending quote commands");
sshc->quote_item = data->set.quote;
state(data, SSH_SFTP_QUOTE);
}