Adding upstream version 3:4.8.29.upstream/3%4.8.29upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

10 files changed, 4468 insertions, 0 deletions

diff --git a/src/vfs/sftpfs/Makefile.am b/src/vfs/sftpfs/Makefile.am
new file mode 100644
index 0000000..35e25c6
--- /dev/null
+++ b/src/vfs/sftpfs/Makefile.am
@@ -0,0 +1,12 @@
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diff --git a/src/vfs/sftpfs/Makefile.in b/src/vfs/sftpfs/Makefile.in
new file mode 100644
index 0000000..b377856
--- /dev/null
+++ b/src/vfs/sftpfs/Makefile.in
@@ -0,0 +1,758 @@
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libvfs-sftpfs.la: $(libvfs_sftpfs_la_OBJECTS) $(libvfs_sftpfs_la_DEPENDENCIES) $(EXTRA_libvfs_sftpfs_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libvfs_sftpfs_la_OBJECTS) $(libvfs_sftpfs_la_LIBADD) $(LIBS)
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+	      $$unique; \
+	  fi; \
+	fi
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+	esac; \
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+distdir-am: $(DISTFILES)
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+	-rm -f ./$(DEPDIR)/connection.Plo
+	-rm -f ./$(DEPDIR)/dir.Plo
+	-rm -f ./$(DEPDIR)/file.Plo
+	-rm -f ./$(DEPDIR)/internal.Plo
+	-rm -f ./$(DEPDIR)/sftpfs.Plo
+	-rm -f Makefile
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+	-rm -f ./$(DEPDIR)/file.Plo
+	-rm -f ./$(DEPDIR)/internal.Plo
+	-rm -f ./$(DEPDIR)/sftpfs.Plo
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+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
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+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/vfs/sftpfs/config_parser.c b/src/vfs/sftpfs/config_parser.c
new file mode 100644
index 0000000..4292b5d
--- /dev/null
+++ b/src/vfs/sftpfs/config_parser.c
@@ -0,0 +1,425 @@
+/* Virtual File System: SFTP file system.
+   The SSH config parser
+
+   Copyright (C) 2011-2022
+   Free Software Foundation, Inc.
+
+   Written by:
+   Ilia Maslakov <il.smind@gmail.com>, 2011
+   Slava Zanko <slavazanko@gmail.com>, 2011, 2012, 2013
+
+   This file is part of the Midnight Commander.
+
+   The Midnight Commander is free software: you can redistribute it
+   and/or modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   The Midnight Commander is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <errno.h>
+#include <stddef.h>
+#include <stdlib.h>             /* atoi() */
+
+#include "lib/global.h"
+
+#include "lib/search.h"
+#include "lib/util.h"           /* tilde_expand() */
+#include "lib/vfs/utilvfs.h"
+
+#include "internal.h"
+
+/*** global variables ****************************************************************************/
+
+/*** file scope macro definitions ****************************************************************/
+
+#define SFTP_DEFAULT_PORT 22
+
+#ifndef SFTPFS_SSH_CONFIG
+#define SFTPFS_SSH_CONFIG "~/.ssh/config"
+#endif
+
+/*** file scope type declarations ****************************************************************/
+
+typedef struct
+{
+    char *real_host;            /* host DNS name or ip address */
+    int port;                   /* port for connect to host */
+    char *user;                 /* the user to log in as */
+    gboolean password_auth;     /* FALSE - no passwords allowed (default TRUE) */
+    gboolean identities_only;   /* TRUE - no ssh agent (default FALSE) */
+    gboolean pubkey_auth;       /* FALSE - disable public key authentication (default TRUE) */
+    char *identity_file;        /* A file from which the user's DSA, ECDSA or DSA authentication identity is read. */
+} sftpfs_ssh_config_entity_t;
+
+enum config_var_type
+{
+    STRING,
+    INTEGER,
+    BOOLEAN,
+    FILENAME
+};
+
+/*** file scope variables ************************************************************************/
+
+/* *INDENT-OFF* */
+static struct
+{
+    const char *pattern;
+    mc_search_t *pattern_regexp;
+    enum config_var_type type;
+    size_t offset;
+} config_variables[] =
+{
+    {"^\\s*User\\s+(.*)$", NULL, STRING, offsetof (sftpfs_ssh_config_entity_t, user)},
+    {"^\\s*HostName\\s+(.*)$", NULL, STRING, offsetof (sftpfs_ssh_config_entity_t, real_host)},
+    {"^\\s*IdentitiesOnly\\s+(.*)$", NULL, BOOLEAN, offsetof (sftpfs_ssh_config_entity_t, identities_only)},
+    {"^\\s*IdentityFile\\s+(.*)$", NULL, FILENAME, offsetof (sftpfs_ssh_config_entity_t, identity_file)},
+    {"^\\s*Port\\s+(.*)$", NULL, INTEGER, offsetof (sftpfs_ssh_config_entity_t, port)},
+    {"^\\s*PasswordAuthentication\\s+(.*)$", NULL, BOOLEAN, offsetof (sftpfs_ssh_config_entity_t, password_auth)},
+    {"^\\s*PubkeyAuthentication\\s+(.*)$", NULL, STRING, offsetof (sftpfs_ssh_config_entity_t, pubkey_auth)},
+    {NULL, NULL, 0, 0}
+};
+/* *INDENT-ON* */
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Free one config entity.
+ *
+ * @param config_entity config entity structure
+ */
+
+static void
+sftpfs_ssh_config_entity_free (sftpfs_ssh_config_entity_t * config_entity)
+{
+    g_free (config_entity->real_host);
+    g_free (config_entity->user);
+    g_free (config_entity->identity_file);
+    g_free (config_entity);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Transform tilda (~) to full home dirname.
+ *
+ * @param filename file name with tilda
+ * @return newly allocated file name with full home dirname
+ */
+
+static char *
+sftpfs_correct_file_name (const char *filename)
+{
+    vfs_path_t *vpath;
+    char *fn;
+
+    fn = tilde_expand (filename);
+    vpath = vfs_path_from_str (fn);
+    g_free (fn);
+    return vfs_path_free (vpath, FALSE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+#define POINTER_TO_STRUCTURE_MEMBER(type)  \
+    ((type) ((char *) config_entity + (size_t) config_variables[i].offset))
+
+/**
+ * Parse string and filling one config entity by parsed data.
+ *
+ * @param config_entity config entity structure
+ * @param buffer        string for parce
+ */
+
+static void
+sftpfs_fill_config_entity_from_string (sftpfs_ssh_config_entity_t * config_entity, char *buffer)
+{
+    int i;
+
+    for (i = 0; config_variables[i].pattern != NULL; i++)
+    {
+        if (mc_search_run (config_variables[i].pattern_regexp, buffer, 0, strlen (buffer), NULL))
+        {
+            int value_offset;
+            char *value;
+
+            int *pointer_int;
+            char **pointer_str;
+            gboolean *pointer_bool;
+
+            /* Calculate start of value in string */
+            value_offset = mc_search_getstart_result_by_num (config_variables[i].pattern_regexp, 1);
+            value = &buffer[value_offset];
+
+            switch (config_variables[i].type)
+            {
+            case STRING:
+                pointer_str = POINTER_TO_STRUCTURE_MEMBER (char **);
+                *pointer_str = g_strdup (value);
+                break;
+            case FILENAME:
+                pointer_str = POINTER_TO_STRUCTURE_MEMBER (char **);
+                *pointer_str = sftpfs_correct_file_name (value);
+                break;
+            case INTEGER:
+                pointer_int = POINTER_TO_STRUCTURE_MEMBER (int *);
+                *pointer_int = atoi (value);
+                break;
+            case BOOLEAN:
+                pointer_bool = POINTER_TO_STRUCTURE_MEMBER (gboolean *);
+                *pointer_bool = strcasecmp (value, "True") == 0;
+                break;
+            default:
+                continue;
+            }
+            return;
+        }
+    }
+}
+
+#undef POINTER_TO_STRUCTURE_MEMBER
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Fill one config entity from config file.
+ *
+ * @param ssh_config_handler file descriptor for the ssh config file
+ * @param config_entity      config entity structure
+ * @param vpath_element      path element with host data (hostname, port)
+ * @param mcerror            pointer to the error handler
+ * @return TRUE if config entity was filled successfully, FALSE otherwise
+ */
+
+static gboolean
+sftpfs_fill_config_entity_from_config (FILE * ssh_config_handler,
+                                       sftpfs_ssh_config_entity_t * config_entity,
+                                       const vfs_path_element_t * vpath_element, GError ** mcerror)
+{
+    char buffer[BUF_MEDIUM];
+    gboolean host_block_hit = FALSE;
+    gboolean pattern_block_hit = FALSE;
+    mc_search_t *host_regexp;
+    gboolean ok = TRUE;
+
+    mc_return_val_if_error (mcerror, FALSE);
+
+    host_regexp = mc_search_new ("^\\s*host\\s+(.*)$", DEFAULT_CHARSET);
+    host_regexp->search_type = MC_SEARCH_T_REGEX;
+    host_regexp->is_case_sensitive = FALSE;
+
+    while (TRUE)
+    {
+        char *cr;
+
+        if (fgets (buffer, sizeof (buffer), ssh_config_handler) == NULL)
+        {
+            int e;
+
+            e = errno;
+
+            if (!feof (ssh_config_handler))
+            {
+                mc_propagate_error (mcerror, e,
+                                    _("sftp: an error occurred while reading %s: %s"),
+                                    SFTPFS_SSH_CONFIG, strerror (e));
+                ok = FALSE;
+                goto done;
+            }
+
+            break;
+        }
+
+        cr = strrchr (buffer, '\n');
+        if (cr != NULL)
+            *cr = '\0';
+
+        if (mc_search_run (host_regexp, buffer, 0, strlen (buffer), NULL))
+        {
+            const char *host_pattern;
+            int host_pattern_offset;
+
+            /* if previous host block exactly describe our connection */
+            if (host_block_hit)
+                goto done;
+
+            host_pattern_offset = mc_search_getstart_result_by_num (host_regexp, 1);
+            host_pattern = &buffer[host_pattern_offset];
+            if (strcmp (host_pattern, vpath_element->host) == 0)
+            {
+                /* current host block describe our connection */
+                host_block_hit = TRUE;
+            }
+            else
+            {
+                mc_search_t *pattern_regexp;
+
+                pattern_regexp = mc_search_new (host_pattern, DEFAULT_CHARSET);
+                pattern_regexp->search_type = MC_SEARCH_T_GLOB;
+                pattern_regexp->is_case_sensitive = FALSE;
+                pattern_regexp->is_entire_line = TRUE;
+                pattern_block_hit =
+                    mc_search_run (pattern_regexp, vpath_element->host, 0,
+                                   strlen (vpath_element->host), NULL);
+                mc_search_free (pattern_regexp);
+            }
+        }
+        else if (pattern_block_hit || host_block_hit)
+        {
+            sftpfs_fill_config_entity_from_string (config_entity, buffer);
+        }
+    }
+
+  done:
+    mc_search_free (host_regexp);
+    return ok;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Open the ssh config file and fill config entity.
+ *
+ * @param vpath_element path element with host data (hostname, port)
+ * @param mcerror       pointer to the error handler
+ * @return newly allocated config entity structure
+ */
+
+static sftpfs_ssh_config_entity_t *
+sftpfs_get_config_entity (const vfs_path_element_t * vpath_element, GError ** mcerror)
+{
+    sftpfs_ssh_config_entity_t *config_entity;
+    FILE *ssh_config_handler;
+    char *config_filename;
+
+    mc_return_val_if_error (mcerror, FALSE);
+
+    config_entity = g_new0 (sftpfs_ssh_config_entity_t, 1);
+    config_entity->password_auth = TRUE;
+    config_entity->identities_only = FALSE;
+    config_entity->pubkey_auth = TRUE;
+    config_entity->port = SFTP_DEFAULT_PORT;
+
+    config_filename = sftpfs_correct_file_name (SFTPFS_SSH_CONFIG);
+    ssh_config_handler = fopen (config_filename, "r");
+    g_free (config_filename);
+
+    if (ssh_config_handler != NULL)
+    {
+        gboolean ok;
+
+        ok = sftpfs_fill_config_entity_from_config
+            (ssh_config_handler, config_entity, vpath_element, mcerror);
+        fclose (ssh_config_handler);
+
+        if (!ok)
+        {
+            sftpfs_ssh_config_entity_free (config_entity);
+            return NULL;
+        }
+    }
+
+    if (config_entity->user == NULL)
+    {
+        config_entity->user = vfs_get_local_username ();
+        if (config_entity->user == NULL)
+        {
+            sftpfs_ssh_config_entity_free (config_entity);
+            config_entity = NULL;
+            mc_propagate_error (mcerror, EPERM, "%s", _("sftp: Unable to get current user name."));
+        }
+    }
+    return config_entity;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Reads data from the ssh config file related to connection.
+ *
+ * @param super connection data
+ * @param error pointer to the error handler
+ */
+
+void
+sftpfs_fill_connection_data_from_config (struct vfs_s_super *super, GError ** mcerror)
+{
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+    sftpfs_ssh_config_entity_t *config_entity;
+
+    mc_return_if_error (mcerror);
+
+    config_entity = sftpfs_get_config_entity (super->path_element, mcerror);
+    if (config_entity == NULL)
+        return;
+
+    sftpfs_super->config_auth_type = (config_entity->pubkey_auth) ? PUBKEY : 0;
+    sftpfs_super->config_auth_type |= (config_entity->identities_only) ? 0 : AGENT;
+    sftpfs_super->config_auth_type |= (config_entity->password_auth) ? PASSWORD : 0;
+
+    if (super->path_element->port == 0)
+        super->path_element->port = config_entity->port;
+
+    if (super->path_element->user == NULL)
+        super->path_element->user = g_strdup (config_entity->user);
+
+    if (config_entity->real_host != NULL)
+    {
+        g_free (super->path_element->host);
+        super->path_element->host = g_strdup (config_entity->real_host);
+    }
+
+    if (config_entity->identity_file != NULL)
+    {
+        sftpfs_super->privkey = g_strdup (config_entity->identity_file);
+        sftpfs_super->pubkey = g_strdup_printf ("%s.pub", config_entity->identity_file);
+    }
+
+    sftpfs_ssh_config_entity_free (config_entity);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Initialize the SSH config parser.
+ */
+
+void
+sftpfs_init_config_variables_patterns (void)
+{
+    int i;
+
+    for (i = 0; config_variables[i].pattern != NULL; i++)
+    {
+        config_variables[i].pattern_regexp =
+            mc_search_new (config_variables[i].pattern, DEFAULT_CHARSET);
+        config_variables[i].pattern_regexp->search_type = MC_SEARCH_T_REGEX;
+        config_variables[i].pattern_regexp->is_case_sensitive = FALSE;
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Deinitialize the SSH config parser.
+ */
+
+void
+sftpfs_deinit_config_variables_patterns (void)
+{
+    int i;
+
+    for (i = 0; config_variables[i].pattern != NULL; i++)
+    {
+        mc_search_free (config_variables[i].pattern_regexp);
+        config_variables[i].pattern_regexp = NULL;
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
diff --git a/src/vfs/sftpfs/connection.c b/src/vfs/sftpfs/connection.c
new file mode 100644
index 0000000..271ada8
--- /dev/null
+++ b/src/vfs/sftpfs/connection.c
@@ -0,0 +1,968 @@
+/* Virtual File System: SFTP file system.
+   The internal functions: connections
+
+   Copyright (C) 2011-2022
+   Free Software Foundation, Inc.
+
+   Written by:
+   Ilia Maslakov <il.smind@gmail.com>, 2011
+   Slava Zanko <slavazanko@gmail.com>, 2011, 2012, 2013
+
+   This file is part of the Midnight Commander.
+
+   The Midnight Commander is free software: you can redistribute it
+   and/or modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   The Midnight Commander is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <errno.h>
+
+#include <netdb.h>              /* struct hostent */
+#include <sys/socket.h>         /* AF_INET */
+#include <netinet/in.h>         /* struct in_addr */
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+
+#include <libssh2.h>
+#include <libssh2_sftp.h>
+
+#include "lib/global.h"
+
+#include "lib/util.h"
+#include "lib/tty/tty.h"        /* tty_enable_interrupt_key () */
+#include "lib/vfs/utilvfs.h"
+#include "lib/mcconfig.h"       /* mc_config_get_home_dir () */
+#include "lib/widget.h"         /* query_dialog () */
+
+#include "internal.h"
+
+/*** global variables ****************************************************************************/
+
+/*** file scope macro definitions ****************************************************************/
+
+#define SHA1_DIGEST_LENGTH 20
+
+/*** file scope type declarations ****************************************************************/
+
+/*** file scope variables ************************************************************************/
+
+#ifdef LIBSSH2_KNOWNHOST_KEY_ED25519
+static const char *const hostkey_method_ssh_ed25519 = "ssh-ed25519";
+#endif
+#ifdef LIBSSH2_KNOWNHOST_KEY_ECDSA_521
+static const char *const hostkey_method_ssh_ecdsa_521 = "ecdsa-sha2-nistp521";
+#endif
+#ifdef LIBSSH2_KNOWNHOST_KEY_ECDSA_384
+static const char *const hostkey_method_ssh_ecdsa_384 = "ecdsa-sha2-nistp384";
+#endif
+#ifdef LIBSSH2_KNOWNHOST_KEY_ECDSA_256
+static const char *const hostkey_method_ssh_ecdsa_256 = "ecdsa-sha2-nistp256";
+#endif
+static const char *const hostkey_method_ssh_rsa = "ssh-rsa";
+static const char *const hostkey_method_ssh_dss = "ssh-dss";
+
+/**
+ *
+ * The current implementation of know host key checking has following limitations:
+ *
+ *   - Only plain-text entries are supported (`HashKnownHosts no` OpenSSH option)
+ *   - Only HEX-encoded SHA1 fingerprint display is supported (`FingerprintHash` OpenSSH option)
+ *   - Resolved IP addresses are *not* saved/validated along with the hostnames
+ *
+ */
+
+static const char *kbi_passwd = NULL;
+static const struct vfs_s_super *kbi_super = NULL;
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Create socket to host.
+ *
+ * @param super   connection data
+ * @param mcerror pointer to the error handler
+ * @return socket descriptor number, -1 if any error was occurred
+ */
+
+static int
+sftpfs_open_socket (struct vfs_s_super *super, GError ** mcerror)
+{
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+    struct addrinfo hints, *res = NULL, *curr_res;
+    int my_socket = 0;
+    char port[BUF_TINY];
+    static char address_ipv4[INET_ADDRSTRLEN];
+    static char address_ipv6[INET6_ADDRSTRLEN];
+    int e;
+
+    mc_return_val_if_error (mcerror, LIBSSH2_INVALID_SOCKET);
+
+    if (super->path_element->host == NULL || *super->path_element->host == '\0')
+    {
+        mc_propagate_error (mcerror, 0, "%s", _("sftp: Invalid host name."));
+        return LIBSSH2_INVALID_SOCKET;
+    }
+
+    sprintf (port, "%hu", (unsigned short) super->path_element->port);
+
+    tty_enable_interrupt_key ();        /* clear the interrupt flag */
+
+    memset (&hints, 0, sizeof (hints));
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = SOCK_STREAM;
+
+#ifdef AI_ADDRCONFIG
+    /* By default, only look up addresses using address types for
+     * which a local interface is configured (i.e. no IPv6 if no IPv6
+     * interfaces, likewise for IPv4 (see RFC 3493 for details). */
+    hints.ai_flags = AI_ADDRCONFIG;
+#endif
+
+    e = getaddrinfo (super->path_element->host, port, &hints, &res);
+
+#ifdef AI_ADDRCONFIG
+    if (e == EAI_BADFLAGS)
+    {
+        /* Retry with no flags if AI_ADDRCONFIG was rejected. */
+        hints.ai_flags = 0;
+        e = getaddrinfo (super->path_element->host, port, &hints, &res);
+    }
+#endif
+
+    if (e != 0)
+    {
+        mc_propagate_error (mcerror, e, _("sftp: %s"), gai_strerror (e));
+        my_socket = LIBSSH2_INVALID_SOCKET;
+        goto ret;
+    }
+
+    for (curr_res = res; curr_res != NULL; curr_res = curr_res->ai_next)
+    {
+        int save_errno;
+
+        switch (curr_res->ai_addr->sa_family)
+        {
+        case AF_INET:
+            sftpfs_super->ip_address =
+                inet_ntop (AF_INET, &((struct sockaddr_in *) curr_res->ai_addr)->sin_addr,
+                           address_ipv4, INET_ADDRSTRLEN);
+            break;
+        case AF_INET6:
+            sftpfs_super->ip_address =
+                inet_ntop (AF_INET6, &((struct sockaddr_in6 *) curr_res->ai_addr)->sin6_addr,
+                           address_ipv6, INET6_ADDRSTRLEN);
+            break;
+        default:
+            sftpfs_super->ip_address = NULL;
+        }
+
+        if (sftpfs_super->ip_address == NULL)
+        {
+            mc_propagate_error (mcerror, 0, "%s",
+                                _("sftp: failed to convert remote host IP address into text form"));
+            my_socket = LIBSSH2_INVALID_SOCKET;
+            goto ret;
+        }
+
+        my_socket = socket (curr_res->ai_family, curr_res->ai_socktype, curr_res->ai_protocol);
+
+        if (my_socket < 0)
+        {
+            if (curr_res->ai_next != NULL)
+                continue;
+
+            vfs_print_message (_("sftp: %s"), unix_error_string (errno));
+            my_socket = LIBSSH2_INVALID_SOCKET;
+            goto ret;
+        }
+
+        vfs_print_message (_("sftp: making connection to %s"), super->path_element->host);
+
+        if (connect (my_socket, curr_res->ai_addr, curr_res->ai_addrlen) >= 0)
+            break;
+
+        save_errno = errno;
+
+        close (my_socket);
+
+        if (save_errno == EINTR && tty_got_interrupt ())
+            mc_propagate_error (mcerror, 0, "%s", _("sftp: connection interrupted by user"));
+        else if (res->ai_next == NULL)
+            mc_propagate_error (mcerror, save_errno, _("sftp: connection to server failed: %s"),
+                                unix_error_string (save_errno));
+        else
+            continue;
+
+        my_socket = LIBSSH2_INVALID_SOCKET;
+        break;
+    }
+
+  ret:
+    if (res != NULL)
+        freeaddrinfo (res);
+    tty_disable_interrupt_key ();
+    return my_socket;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Read ~/.ssh/known_hosts file.
+ *
+ * @param super connection data
+ * @param mcerror pointer to the error handler
+ * @return TRUE on success, FALSE otherwise
+ *
+ * Thanks the Curl project for the code used in this function.
+ */
+static gboolean
+sftpfs_read_known_hosts (struct vfs_s_super *super, GError ** mcerror)
+{
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+    struct libssh2_knownhost *store = NULL;
+    int rc;
+    gboolean found = FALSE;
+
+    sftpfs_super->known_hosts = libssh2_knownhost_init (sftpfs_super->session);
+    if (sftpfs_super->known_hosts == NULL)
+        goto err;
+
+    sftpfs_super->known_hosts_file =
+        mc_build_filename (mc_config_get_home_dir (), ".ssh", "known_hosts", (char *) NULL);
+    rc = libssh2_knownhost_readfile (sftpfs_super->known_hosts, sftpfs_super->known_hosts_file,
+                                     LIBSSH2_KNOWNHOST_FILE_OPENSSH);
+    if (rc > 0)
+    {
+        const char *kh_name_end = NULL;
+
+        while (!found && libssh2_knownhost_get (sftpfs_super->known_hosts, &store, store) == 0)
+        {
+            /* For non-standard ports, the name will be enclosed in
+             * square brackets, followed by a colon and the port */
+            if (store == NULL)
+                continue;
+
+            if (store->name == NULL)
+                found = TRUE;
+            else if (store->name[0] != '[')
+                found = strcmp (store->name, super->path_element->host) == 0;
+            else
+            {
+                int port;
+
+                kh_name_end = strstr (store->name, "]:");
+                if (kh_name_end == NULL)
+                    /* Invalid host pattern */
+                    continue;
+
+                port = (int) g_ascii_strtoll (kh_name_end + 2, NULL, 10);
+                if (port == super->path_element->port)
+                {
+                    size_t kh_name_size;
+
+                    kh_name_size = strlen (store->name) - 1 - strlen (kh_name_end);
+                    found = strncmp (store->name + 1, super->path_element->host, kh_name_size) == 0;
+                }
+            }
+        }
+    }
+
+    if (found)
+    {
+        int mask;
+        const char *hostkey_method = NULL;
+
+        mask = store->typemask & LIBSSH2_KNOWNHOST_KEY_MASK;
+
+        switch (mask)
+        {
+#ifdef LIBSSH2_KNOWNHOST_KEY_ED25519
+        case LIBSSH2_KNOWNHOST_KEY_ED25519:
+            hostkey_method = hostkey_method_ssh_ed25519;
+            break;
+#endif
+#ifdef LIBSSH2_KNOWNHOST_KEY_ECDSA_521
+        case LIBSSH2_KNOWNHOST_KEY_ECDSA_521:
+            hostkey_method = hostkey_method_ssh_ecdsa_521;
+            break;
+#endif
+#ifdef LIBSSH2_KNOWNHOST_KEY_ECDSA_384
+        case LIBSSH2_KNOWNHOST_KEY_ECDSA_384:
+            hostkey_method = hostkey_method_ssh_ecdsa_384;
+            break;
+#endif
+#ifdef LIBSSH2_KNOWNHOST_KEY_ECDSA_256
+        case LIBSSH2_KNOWNHOST_KEY_ECDSA_256:
+            hostkey_method = hostkey_method_ssh_ecdsa_256;
+            break;
+#endif
+        case LIBSSH2_KNOWNHOST_KEY_SSHRSA:
+            hostkey_method = hostkey_method_ssh_rsa;
+            break;
+        case LIBSSH2_KNOWNHOST_KEY_SSHDSS:
+            hostkey_method = hostkey_method_ssh_dss;
+            break;
+        case LIBSSH2_KNOWNHOST_KEY_RSA1:
+            mc_propagate_error (mcerror, 0, "%s",
+                                _("sftp: found host key of unsupported type: RSA1"));
+            return FALSE;
+        default:
+            mc_propagate_error (mcerror, 0, "%s %u", _("sftp: unknown host key type:"),
+                                (unsigned int) mask);
+            return FALSE;
+        }
+
+        rc = libssh2_session_method_pref (sftpfs_super->session, LIBSSH2_METHOD_HOSTKEY,
+                                          hostkey_method);
+        if (rc < 0)
+            goto err;
+    }
+
+    return TRUE;
+
+  err:
+    {
+        int sftp_errno;
+
+        sftp_errno = libssh2_session_last_errno (sftpfs_super->session);
+        sftpfs_ssherror_to_gliberror (sftpfs_super, sftp_errno, mcerror);
+    }
+    return FALSE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Write new host + key pair to the ~/.ssh/known_hosts file.
+ *
+ * @param super connection data
+ * @param remote_key he key for the remote host
+ * @param remote_key_len length of @remote_key
+ * @param type_mask info about format of host name, key and key type
+ * @return 0 on success, regular libssh2 error code otherwise
+ *
+ * Thanks the Curl project for the code used in this function.
+ */
+static int
+sftpfs_update_known_hosts (struct vfs_s_super *super, const char *remote_key, size_t remote_key_len,
+                           int type_mask)
+{
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+    int rc;
+
+    /* add this host + key pair  */
+    rc = libssh2_knownhost_addc (sftpfs_super->known_hosts, super->path_element->host, NULL,
+                                 remote_key, remote_key_len, NULL, 0, type_mask, NULL);
+    if (rc < 0)
+        return rc;
+
+    /* write the entire in-memory list of known hosts to the known_hosts file */
+    rc = libssh2_knownhost_writefile (sftpfs_super->known_hosts, sftpfs_super->known_hosts_file,
+                                      LIBSSH2_KNOWNHOST_FILE_OPENSSH);
+
+    if (rc < 0)
+        return rc;
+
+    (void) message (D_NORMAL, _("Information"),
+                    _("Permanently added\n%s (%s)\nto the list of known hosts."),
+                    super->path_element->host, sftpfs_super->ip_address);
+
+    return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Compute and return readable host key fingerprint hash.
+ *
+ * @param session libssh2 session handle
+ * @return pointer to static buffer on success, NULL otherwise
+ */
+static const char *
+sftpfs_compute_fingerprint_hash (LIBSSH2_SESSION * session)
+{
+    static char result[SHA1_DIGEST_LENGTH * 3 + 1];     /* "XX:" for each byte, and EOL */
+    const char *fingerprint;
+    size_t i;
+
+    /* The fingerprint points to static storage (!), don't free() it. */
+    fingerprint = libssh2_hostkey_hash (session, LIBSSH2_HOSTKEY_HASH_SHA1);
+    if (fingerprint == NULL)
+        return NULL;
+
+    for (i = 0; i < SHA1_DIGEST_LENGTH && i * 3 < sizeof (result) - 1; i++)
+        g_snprintf ((gchar *) (result + i * 3), 4, "%02x:", (guint8) fingerprint[i]);
+
+    /* remove last ":" */
+    result[i * 3 - 1] = '\0';
+
+    return result;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Process host info found in ~/.ssh/known_hosts file.
+ *
+ * @param super connection data
+ * @param mcerror pointer to the error handler
+ * @return TRUE on success, FALSE otherwise
+ *
+ * Thanks the Curl project for the code used in this function.
+ */
+static gboolean
+sftpfs_process_known_host (struct vfs_s_super *super, GError ** mcerror)
+{
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+    const char *remote_key;
+    const char *key_type;
+    const char *fingerprint_hash;
+    size_t remote_key_len = 0;
+    int remote_key_type = LIBSSH2_HOSTKEY_TYPE_UNKNOWN;
+    int keybit = 0;
+    struct libssh2_knownhost *host = NULL;
+    int rc;
+    char *msg = NULL;
+    gboolean handle_query = FALSE;
+
+    remote_key = libssh2_session_hostkey (sftpfs_super->session, &remote_key_len, &remote_key_type);
+    if (remote_key == NULL || remote_key_len == 0
+        || remote_key_type == LIBSSH2_HOSTKEY_TYPE_UNKNOWN)
+    {
+        mc_propagate_error (mcerror, 0, "%s", _("sftp: cannot get the remote host key"));
+        return FALSE;
+    }
+
+    switch (remote_key_type)
+    {
+    case LIBSSH2_HOSTKEY_TYPE_RSA:
+        keybit = LIBSSH2_KNOWNHOST_KEY_SSHRSA;
+        key_type = "RSA";
+        break;
+    case LIBSSH2_HOSTKEY_TYPE_DSS:
+        keybit = LIBSSH2_KNOWNHOST_KEY_SSHDSS;
+        key_type = "DSS";
+        break;
+#ifdef LIBSSH2_HOSTKEY_TYPE_ECDSA_256
+    case LIBSSH2_HOSTKEY_TYPE_ECDSA_256:
+        keybit = LIBSSH2_KNOWNHOST_KEY_ECDSA_256;
+        key_type = "ECDSA";
+        break;
+#endif
+#ifdef LIBSSH2_HOSTKEY_TYPE_ECDSA_384
+    case LIBSSH2_HOSTKEY_TYPE_ECDSA_384:
+        keybit = LIBSSH2_KNOWNHOST_KEY_ECDSA_384;
+        key_type = "ECDSA";
+        break;
+#endif
+#ifdef LIBSSH2_HOSTKEY_TYPE_ECDSA_521
+    case LIBSSH2_HOSTKEY_TYPE_ECDSA_521:
+        keybit = LIBSSH2_KNOWNHOST_KEY_ECDSA_521;
+        key_type = "ECDSA";
+        break;
+#endif
+#ifdef LIBSSH2_HOSTKEY_TYPE_ED25519
+    case LIBSSH2_HOSTKEY_TYPE_ED25519:
+        keybit = LIBSSH2_KNOWNHOST_KEY_ED25519;
+        key_type = "ED25519";
+        break;
+#endif
+    default:
+        mc_propagate_error (mcerror, 0, "%s",
+                            _("sftp: unsupported key type, can't check remote host key"));
+        return FALSE;
+    }
+
+    fingerprint_hash = sftpfs_compute_fingerprint_hash (sftpfs_super->session);
+    if (fingerprint_hash == NULL)
+    {
+        mc_propagate_error (mcerror, 0, "%s", _("sftp: can't compute host key fingerprint hash"));
+        return FALSE;
+    }
+
+    rc = libssh2_knownhost_checkp (sftpfs_super->known_hosts, super->path_element->host,
+                                   super->path_element->port, remote_key, remote_key_len,
+                                   LIBSSH2_KNOWNHOST_TYPE_PLAIN | LIBSSH2_KNOWNHOST_KEYENC_RAW |
+                                   keybit, &host);
+
+    switch (rc)
+    {
+    default:
+    case LIBSSH2_KNOWNHOST_CHECK_FAILURE:
+        /* something prevented the check to be made */
+        goto err;
+
+    case LIBSSH2_KNOWNHOST_CHECK_MATCH:
+        /* host + key pair matched -- OK */
+        break;
+
+    case LIBSSH2_KNOWNHOST_CHECK_NOTFOUND:
+        /* no host match was found -- add it to the known_hosts file */
+        msg = g_strdup_printf (_("The authenticity of host\n%s (%s)\ncan't be established!\n"
+                                 "%s key fingerprint hash is\nSHA1:%s.\n"
+                                 "Do you want to add it to the list of known hosts and continue connecting?"),
+                               super->path_element->host, sftpfs_super->ip_address,
+                               key_type, fingerprint_hash);
+        /* Select "No" initially */
+        query_set_sel (2);
+        rc = query_dialog (_("Warning"), msg, D_NORMAL, 3, _("&Yes"), _("&Ignore"), _("&No"));
+        g_free (msg);
+        handle_query = TRUE;
+        break;
+
+    case LIBSSH2_KNOWNHOST_CHECK_MISMATCH:
+        msg = g_strdup_printf (_("%s (%s)\nis found in the list of known hosts but\n"
+                                 "KEYS DO NOT MATCH! THIS COULD BE A MITM ATTACK!\n"
+                                 "Are you sure you want to add it to the list of known hosts and continue connecting?"),
+                               super->path_element->host, sftpfs_super->ip_address);
+        /* Select "No" initially */
+        query_set_sel (2);
+        rc = query_dialog (MSG_ERROR, msg, D_ERROR, 3, _("&Yes"), _("&Ignore"), _("&No"));
+        g_free (msg);
+        handle_query = TRUE;
+        break;
+    }
+
+    if (handle_query)
+        switch (rc)
+        {
+        case 0:
+            /* Yes: add this host + key pair, continue connecting */
+            if (sftpfs_update_known_hosts (super, remote_key, remote_key_len,
+                                           LIBSSH2_KNOWNHOST_TYPE_PLAIN
+                                           | LIBSSH2_KNOWNHOST_KEYENC_RAW | keybit) < 0)
+                goto err;
+            break;
+        case 1:
+            /* Ignore: do not add this host + key pair, continue connecting anyway */
+            break;
+        case 2:
+        default:
+            mc_propagate_error (mcerror, 0, "%s", _("sftp: host key verification failed"));
+            /* No: abort connection */
+            goto err;
+        }
+
+    return TRUE;
+
+  err:
+    {
+        int sftp_errno;
+
+        sftp_errno = libssh2_session_last_errno (sftpfs_super->session);
+        sftpfs_ssherror_to_gliberror (sftpfs_super, sftp_errno, mcerror);
+    }
+
+    return FALSE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Recognize authentication types supported by remote side and filling internal 'super' structure by
+ * proper enum's values.
+ *
+ * @param super connection data
+ * @return TRUE if some of authentication methods is available, FALSE otherwise
+ */
+static gboolean
+sftpfs_recognize_auth_types (struct vfs_s_super *super)
+{
+    char *userauthlist;
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+
+    /* check what authentication methods are available */
+    /* userauthlist is internally managed by libssh2 and freed by libssh2_session_free() */
+    userauthlist = libssh2_userauth_list (sftpfs_super->session, super->path_element->user,
+                                          strlen (super->path_element->user));
+
+    if (userauthlist == NULL)
+        return FALSE;
+
+    if ((strstr (userauthlist, "password") != NULL
+         || strstr (userauthlist, "keyboard-interactive") != NULL)
+        && (sftpfs_super->config_auth_type & PASSWORD) != 0)
+        sftpfs_super->auth_type |= PASSWORD;
+
+    if (strstr (userauthlist, "publickey") != NULL
+        && (sftpfs_super->config_auth_type & PUBKEY) != 0)
+        sftpfs_super->auth_type |= PUBKEY;
+
+    if ((sftpfs_super->config_auth_type & AGENT) != 0)
+        sftpfs_super->auth_type |= AGENT;
+
+    return TRUE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Open connection to host using SSH-agent helper.
+ *
+ * @param super   connection data
+ * @param mcerror pointer to the error handler
+ * @return TRUE if connection was successfully opened, FALSE otherwise
+ */
+
+static gboolean
+sftpfs_open_connection_ssh_agent (struct vfs_s_super *super, GError ** mcerror)
+{
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+    struct libssh2_agent_publickey *identity, *prev_identity = NULL;
+    int rc;
+
+    mc_return_val_if_error (mcerror, FALSE);
+
+    sftpfs_super->agent = NULL;
+
+    if ((sftpfs_super->auth_type & AGENT) == 0)
+        return FALSE;
+
+    /* Connect to the ssh-agent */
+    sftpfs_super->agent = libssh2_agent_init (sftpfs_super->session);
+    if (sftpfs_super->agent == NULL)
+        return FALSE;
+
+    if (libssh2_agent_connect (sftpfs_super->agent) != 0)
+        return FALSE;
+
+    if (libssh2_agent_list_identities (sftpfs_super->agent) != 0)
+        return FALSE;
+
+    while (TRUE)
+    {
+        rc = libssh2_agent_get_identity (sftpfs_super->agent, &identity, prev_identity);
+        if (rc == 1)
+            break;
+
+        if (rc < 0)
+            return FALSE;
+
+        if (libssh2_agent_userauth (sftpfs_super->agent, super->path_element->user, identity) == 0)
+            break;
+
+        prev_identity = identity;
+    }
+
+    return (rc == 0);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Open connection to host using SSH-keypair.
+ *
+ * @param super   connection data
+ * @param mcerror pointer to the error handler
+ * @return TRUE if connection was successfully opened, FALSE otherwise
+ */
+
+static gboolean
+sftpfs_open_connection_ssh_key (struct vfs_s_super *super, GError ** mcerror)
+{
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+    char *p, *passwd;
+    gboolean ret_value = FALSE;
+
+    mc_return_val_if_error (mcerror, FALSE);
+
+    if ((sftpfs_super->auth_type & PUBKEY) == 0)
+        return FALSE;
+
+    if (sftpfs_super->privkey == NULL)
+        return FALSE;
+
+    if (libssh2_userauth_publickey_fromfile (sftpfs_super->session, super->path_element->user,
+                                             sftpfs_super->pubkey, sftpfs_super->privkey,
+                                             super->path_element->password) == 0)
+        return TRUE;
+
+    p = g_strdup_printf (_("sftp: Enter passphrase for %s "), super->path_element->user);
+    passwd = vfs_get_password (p);
+    g_free (p);
+
+    if (passwd == NULL)
+        mc_propagate_error (mcerror, 0, "%s", _("sftp: Passphrase is empty."));
+    else
+    {
+        ret_value = (libssh2_userauth_publickey_fromfile (sftpfs_super->session,
+                                                          super->path_element->user,
+                                                          sftpfs_super->pubkey,
+                                                          sftpfs_super->privkey, passwd) == 0);
+        g_free (passwd);
+    }
+
+    return ret_value;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Keyboard-interactive password helper for opening connection to host by
+ * sftpfs_open_connection_ssh_password
+ *
+ * Uses global kbi_super (data with existing connection) and kbi_passwd (password)
+ *
+ * @param name             username
+ * @param name_len         length of @name
+ * @param instruction      unused
+ * @param instruction_len  unused
+ * @param num_prompts      number of possible problems to process
+ * @param prompts          array of prompts to process
+ * @param responses        array of responses, one per prompt
+ * @param abstract         unused
+ */
+
+static
+LIBSSH2_USERAUTH_KBDINT_RESPONSE_FUNC (sftpfs_keyboard_interactive_helper)
+{
+    int i;
+    size_t len;
+
+    (void) instruction;
+    (void) instruction_len;
+    (void) abstract;
+
+    if (kbi_super == NULL || kbi_passwd == NULL)
+        return;
+
+    if (strncmp (name, kbi_super->path_element->user, name_len) != 0)
+        return;
+
+    /* assume these are password prompts */
+    len = strlen (kbi_passwd);
+
+    for (i = 0; i < num_prompts; ++i)
+        if (strncmp (prompts[i].text, "Password: ", prompts[i].length) == 0)
+        {
+            responses[i].text = strdup (kbi_passwd);
+            responses[i].length = len;
+        }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Open connection to host using password.
+ *
+ * @param super   connection data
+ * @param mcerror pointer to the error handler
+ * @return TRUE if connection was successfully opened, FALSE otherwise
+ */
+
+static gboolean
+sftpfs_open_connection_ssh_password (struct vfs_s_super *super, GError ** mcerror)
+{
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+    char *p, *passwd;
+    gboolean ret_value = FALSE;
+    int rc;
+
+    mc_return_val_if_error (mcerror, FALSE);
+
+    if ((sftpfs_super->auth_type & PASSWORD) == 0)
+        return FALSE;
+
+    if (super->path_element->password != NULL)
+    {
+        while ((rc = libssh2_userauth_password (sftpfs_super->session, super->path_element->user,
+                                                super->path_element->password)) ==
+               LIBSSH2_ERROR_EAGAIN);
+        if (rc == 0)
+            return TRUE;
+
+        kbi_super = super;
+        kbi_passwd = super->path_element->password;
+
+        while ((rc =
+                libssh2_userauth_keyboard_interactive (sftpfs_super->session,
+                                                       super->path_element->user,
+                                                       sftpfs_keyboard_interactive_helper)) ==
+               LIBSSH2_ERROR_EAGAIN)
+            ;
+
+        kbi_super = NULL;
+        kbi_passwd = NULL;
+
+        if (rc == 0)
+            return TRUE;
+    }
+
+    p = g_strdup_printf (_("sftp: Enter password for %s "), super->path_element->user);
+    passwd = vfs_get_password (p);
+    g_free (p);
+
+    if (passwd == NULL)
+        mc_propagate_error (mcerror, 0, "%s", _("sftp: Password is empty."));
+    else
+    {
+        while ((rc = libssh2_userauth_password (sftpfs_super->session, super->path_element->user,
+                                                passwd)) == LIBSSH2_ERROR_EAGAIN)
+            ;
+
+        if (rc != 0)
+        {
+            kbi_super = super;
+            kbi_passwd = passwd;
+
+            while ((rc =
+                    libssh2_userauth_keyboard_interactive (sftpfs_super->session,
+                                                           super->path_element->user,
+                                                           sftpfs_keyboard_interactive_helper)) ==
+                   LIBSSH2_ERROR_EAGAIN)
+                ;
+
+            kbi_super = NULL;
+            kbi_passwd = NULL;
+        }
+
+        if (rc == 0)
+        {
+            ret_value = TRUE;
+            g_free (super->path_element->password);
+            super->path_element->password = passwd;
+        }
+        else
+            g_free (passwd);
+    }
+
+    return ret_value;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Open new connection.
+ *
+ * @param super   connection data
+ * @param mcerror pointer to the error handler
+ * @return 0 if success, -1 otherwise
+ */
+
+int
+sftpfs_open_connection (struct vfs_s_super *super, GError ** mcerror)
+{
+    int rc;
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+
+    mc_return_val_if_error (mcerror, -1);
+
+    /*
+     * The application code is responsible for creating the socket
+     * and establishing the connection
+     */
+    sftpfs_super->socket_handle = sftpfs_open_socket (super, mcerror);
+    if (sftpfs_super->socket_handle == LIBSSH2_INVALID_SOCKET)
+        return (-1);
+
+    /* Create a session instance */
+    sftpfs_super->session = libssh2_session_init ();
+    if (sftpfs_super->session == NULL)
+        return (-1);
+
+    if (!sftpfs_read_known_hosts (super, mcerror))
+        return (-1);
+
+    /* ... start it up. This will trade welcome banners, exchange keys,
+     * and setup crypto, compression, and MAC layers
+     */
+    while ((rc =
+            libssh2_session_handshake (sftpfs_super->session,
+                                       (libssh2_socket_t) sftpfs_super->socket_handle)) ==
+           LIBSSH2_ERROR_EAGAIN)
+        ;
+    if (rc != 0)
+    {
+        mc_propagate_error (mcerror, rc, "%s", _("sftp: failure establishing SSH session"));
+        return (-1);
+    }
+
+    if (!sftpfs_process_known_host (super, mcerror))
+        return (-1);
+
+    if (!sftpfs_recognize_auth_types (super))
+    {
+        int sftp_errno;
+
+        sftp_errno = libssh2_session_last_errno (sftpfs_super->session);
+        sftpfs_ssherror_to_gliberror (sftpfs_super, sftp_errno, mcerror);
+        return (-1);
+    }
+
+    if (!sftpfs_open_connection_ssh_agent (super, mcerror)
+        && !sftpfs_open_connection_ssh_key (super, mcerror)
+        && !sftpfs_open_connection_ssh_password (super, mcerror))
+        return (-1);
+
+    sftpfs_super->sftp_session = libssh2_sftp_init (sftpfs_super->session);
+
+    if (sftpfs_super->sftp_session == NULL)
+        return (-1);
+
+    /* Since we have not set non-blocking, tell libssh2 we are blocking */
+    libssh2_session_set_blocking (sftpfs_super->session, 1);
+
+    return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Close connection.
+ *
+ * @param super            connection data
+ * @param shutdown_message message for shutdown functions
+ * @param mcerror          pointer to the error handler
+ */
+
+void
+sftpfs_close_connection (struct vfs_s_super *super, const char *shutdown_message, GError ** mcerror)
+{
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+
+    /* no mc_return_*_if_error() here because of abort open_connection handling too */
+    (void) mcerror;
+
+    if (sftpfs_super->sftp_session != NULL)
+    {
+        libssh2_sftp_shutdown (sftpfs_super->sftp_session);
+        sftpfs_super->sftp_session = NULL;
+    }
+
+    if (sftpfs_super->agent != NULL)
+    {
+        libssh2_agent_disconnect (sftpfs_super->agent);
+        libssh2_agent_free (sftpfs_super->agent);
+        sftpfs_super->agent = NULL;
+    }
+
+    if (sftpfs_super->known_hosts != NULL)
+    {
+        libssh2_knownhost_free (sftpfs_super->known_hosts);
+        sftpfs_super->known_hosts = NULL;
+    }
+
+    MC_PTR_FREE (sftpfs_super->known_hosts_file);
+
+    if (sftpfs_super->session != NULL)
+    {
+        libssh2_session_disconnect (sftpfs_super->session, shutdown_message);
+        libssh2_session_free (sftpfs_super->session);
+        sftpfs_super->session = NULL;
+    }
+
+    if (sftpfs_super->socket_handle != LIBSSH2_INVALID_SOCKET)
+    {
+        close (sftpfs_super->socket_handle);
+        sftpfs_super->socket_handle = LIBSSH2_INVALID_SOCKET;
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
diff --git a/src/vfs/sftpfs/dir.c b/src/vfs/sftpfs/dir.c
new file mode 100644
index 0000000..3a84251
--- /dev/null
+++ b/src/vfs/sftpfs/dir.c
@@ -0,0 +1,261 @@
+/* Virtual File System: SFTP file system.
+   The internal functions: dirs
+
+   Copyright (C) 2011-2022
+   Free Software Foundation, Inc.
+
+   Written by:
+   Ilia Maslakov <il.smind@gmail.com>, 2011
+   Slava Zanko <slavazanko@gmail.com>, 2011, 2012
+
+   This file is part of the Midnight Commander.
+
+   The Midnight Commander is free software: you can redistribute it
+   and/or modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   The Midnight Commander is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+
+#include <libssh2.h>
+#include <libssh2_sftp.h>
+
+#include "lib/global.h"
+#include "lib/util.h"
+
+#include "internal.h"
+
+/*** global variables ****************************************************************************/
+
+/*** file scope macro definitions ****************************************************************/
+
+/*** file scope type declarations ****************************************************************/
+
+typedef struct
+{
+    LIBSSH2_SFTP_HANDLE *handle;
+    sftpfs_super_t *super;
+} sftpfs_dir_data_t;
+
+/*** file scope variables ************************************************************************/
+
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Open a directory stream corresponding to the directory name.
+ *
+ * @param vpath   path to directory
+ * @param mcerror pointer to the error handler
+ * @return directory data handler if success, NULL otherwise
+ */
+
+void *
+sftpfs_opendir (const vfs_path_t * vpath, GError ** mcerror)
+{
+    sftpfs_dir_data_t *sftpfs_dir;
+    struct vfs_s_super *super;
+    sftpfs_super_t *sftpfs_super;
+    const vfs_path_element_t *path_element;
+    LIBSSH2_SFTP_HANDLE *handle;
+    const GString *fixfname;
+
+    mc_return_val_if_error (mcerror, NULL);
+
+    path_element = vfs_path_get_by_index (vpath, -1);
+
+    if (vfs_s_get_path (vpath, &super, 0) == NULL)
+        return NULL;
+
+    sftpfs_super = SFTP_SUPER (super);
+
+    fixfname = sftpfs_fix_filename (path_element->path);
+
+    while (TRUE)
+    {
+        int libssh_errno;
+
+        handle =
+            libssh2_sftp_open_ex (sftpfs_super->sftp_session, fixfname->str, fixfname->len, 0, 0,
+                                  LIBSSH2_SFTP_OPENDIR);
+        if (handle != NULL)
+            break;
+
+        libssh_errno = libssh2_session_last_errno (sftpfs_super->session);
+        if (!sftpfs_waitsocket (sftpfs_super, libssh_errno, mcerror))
+            return NULL;
+    }
+
+    sftpfs_dir = g_new0 (sftpfs_dir_data_t, 1);
+    sftpfs_dir->handle = handle;
+    sftpfs_dir->super = sftpfs_super;
+
+    return (void *) sftpfs_dir;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Get a pointer to a structure representing the next directory entry.
+ *
+ * @param data    directory data handler
+ * @param mcerror pointer to the error handler
+ * @return information about direntry if success, NULL otherwise
+ */
+
+struct vfs_dirent *
+sftpfs_readdir (void *data, GError ** mcerror)
+{
+    char mem[BUF_MEDIUM];
+    LIBSSH2_SFTP_ATTRIBUTES attrs;
+    sftpfs_dir_data_t *sftpfs_dir = (sftpfs_dir_data_t *) data;
+    int rc;
+
+    mc_return_val_if_error (mcerror, NULL);
+
+    do
+    {
+        rc = libssh2_sftp_readdir (sftpfs_dir->handle, mem, sizeof (mem), &attrs);
+        if (rc >= 0)
+            break;
+
+        if (!sftpfs_waitsocket (sftpfs_dir->super, rc, mcerror))
+            return NULL;
+    }
+    while (rc == LIBSSH2_ERROR_EAGAIN);
+
+    return (rc != 0 ? vfs_dirent_init (NULL, mem, 0) : NULL);   /* FIXME: inode */
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Close the directory stream.
+ *
+ * @param data    directory data handler
+ * @param mcerror pointer to the error handler
+ * @return 0 if success, negative value otherwise
+ */
+
+int
+sftpfs_closedir (void *data, GError ** mcerror)
+{
+    int rc;
+    sftpfs_dir_data_t *sftpfs_dir = (sftpfs_dir_data_t *) data;
+
+    mc_return_val_if_error (mcerror, -1);
+
+    rc = libssh2_sftp_closedir (sftpfs_dir->handle);
+    g_free (sftpfs_dir);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Create a new directory.
+ *
+ * @param vpath   path directory
+ * @param mode    mode (see man 2 open)
+ * @param mcerror pointer to the error handler
+ * @return 0 if success, negative value otherwise
+ */
+
+int
+sftpfs_mkdir (const vfs_path_t * vpath, mode_t mode, GError ** mcerror)
+{
+    int res;
+    struct vfs_s_super *super;
+    sftpfs_super_t *sftpfs_super;
+    const vfs_path_element_t *path_element;
+    const GString *fixfname;
+
+    mc_return_val_if_error (mcerror, -1);
+
+    path_element = vfs_path_get_by_index (vpath, -1);
+
+    if (vfs_s_get_path (vpath, &super, 0) == NULL)
+        return -1;
+
+    if (super == NULL)
+        return -1;
+
+    sftpfs_super = SFTP_SUPER (super);
+    if (sftpfs_super->sftp_session == NULL)
+        return -1;
+
+    fixfname = sftpfs_fix_filename (path_element->path);
+
+    do
+    {
+        res =
+            libssh2_sftp_mkdir_ex (sftpfs_super->sftp_session, fixfname->str, fixfname->len, mode);
+        if (res >= 0)
+            break;
+
+        if (!sftpfs_waitsocket (sftpfs_super, res, mcerror))
+            return -1;
+    }
+    while (res == LIBSSH2_ERROR_EAGAIN);
+
+    return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Remove a directory.
+ *
+ * @param vpath   path directory
+ * @param mcerror pointer to the error handler
+ * @return 0 if success, negative value otherwise
+ */
+
+int
+sftpfs_rmdir (const vfs_path_t * vpath, GError ** mcerror)
+{
+    int res;
+    struct vfs_s_super *super;
+    sftpfs_super_t *sftpfs_super;
+    const vfs_path_element_t *path_element;
+    const GString *fixfname;
+
+    mc_return_val_if_error (mcerror, -1);
+
+    path_element = vfs_path_get_by_index (vpath, -1);
+
+    if (vfs_s_get_path (vpath, &super, 0) == NULL)
+        return -1;
+
+    if (super == NULL)
+        return -1;
+
+    sftpfs_super = SFTP_SUPER (super);
+    if (sftpfs_super->sftp_session == NULL)
+        return -1;
+
+    fixfname = sftpfs_fix_filename (path_element->path);
+
+    do
+    {
+        res = libssh2_sftp_rmdir_ex (sftpfs_super->sftp_session, fixfname->str, fixfname->len);
+        if (res >= 0)
+            break;
+
+        if (!sftpfs_waitsocket (sftpfs_super, res, mcerror))
+            return -1;
+    }
+    while (res == LIBSSH2_ERROR_EAGAIN);
+
+    return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
diff --git a/src/vfs/sftpfs/file.c b/src/vfs/sftpfs/file.c
new file mode 100644
index 0000000..f124d17
--- /dev/null
+++ b/src/vfs/sftpfs/file.c
@@ -0,0 +1,421 @@
+/* Virtual File System: SFTP file system.
+   The internal functions: files
+
+   Copyright (C) 2011-2022
+   Free Software Foundation, Inc.
+
+   Written by:
+   Ilia Maslakov <il.smind@gmail.com>, 2011
+   Slava Zanko <slavazanko@gmail.com>, 2011, 2012
+
+   This file is part of the Midnight Commander.
+
+   The Midnight Commander is free software: you can redistribute it
+   and/or modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   The Midnight Commander is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+
+#include <errno.h>
+#include <libssh2.h>
+#include <libssh2_sftp.h>
+
+#include "lib/global.h"
+#include "lib/util.h"
+
+#include "internal.h"
+
+/*** global variables ****************************************************************************/
+
+/*** file scope macro definitions ****************************************************************/
+
+#define SFTP_FILE_HANDLER(a) ((sftpfs_file_handler_t *) a)
+
+/*** file scope type declarations ****************************************************************/
+
+typedef struct
+{
+    vfs_file_handler_t base;    /* base class */
+
+    LIBSSH2_SFTP_HANDLE *handle;
+    int flags;
+    mode_t mode;
+} sftpfs_file_handler_t;
+
+/*** file scope variables ************************************************************************/
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Reopen file by file handle.
+ *
+ * @param fh      the file handler
+ * @param mcerror pointer to the error handler
+ */
+static void
+sftpfs_reopen (vfs_file_handler_t * fh, GError ** mcerror)
+{
+    sftpfs_file_handler_t *file = SFTP_FILE_HANDLER (fh);
+    int flags;
+    mode_t mode;
+
+    g_return_if_fail (mcerror == NULL || *mcerror == NULL);
+
+    flags = file->flags;
+    mode = file->mode;
+
+    sftpfs_close_file (fh, mcerror);
+    sftpfs_open_file (fh, flags, mode, mcerror);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+sftpfs_file__handle_error (sftpfs_super_t * super, int sftp_res, GError ** mcerror)
+{
+    if (sftpfs_is_sftp_error (super->sftp_session, sftp_res, LIBSSH2_FX_PERMISSION_DENIED))
+        return -EACCES;
+
+    if (sftpfs_is_sftp_error (super->sftp_session, sftp_res, LIBSSH2_FX_NO_SUCH_FILE))
+        return -ENOENT;
+
+    if (!sftpfs_waitsocket (super, sftp_res, mcerror))
+        return -1;
+
+    return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+vfs_file_handler_t *
+sftpfs_fh_new (struct vfs_s_inode * ino, gboolean changed)
+{
+    sftpfs_file_handler_t *fh;
+
+    fh = g_new0 (sftpfs_file_handler_t, 1);
+    vfs_s_init_fh (VFS_FILE_HANDLER (fh), ino, changed);
+
+    return VFS_FILE_HANDLER (fh);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Open new SFTP file.
+ *
+ * @param fh      the file handler
+ * @param flags   flags (see man 2 open)
+ * @param mode    mode (see man 2 open)
+ * @param mcerror pointer to the error handler
+ * @return TRUE if connection was created successfully, FALSE otherwise
+ */
+
+gboolean
+sftpfs_open_file (vfs_file_handler_t * fh, int flags, mode_t mode, GError ** mcerror)
+{
+    unsigned long sftp_open_flags = 0;
+    int sftp_open_mode = 0;
+    gboolean do_append = FALSE;
+    sftpfs_file_handler_t *file = SFTP_FILE_HANDLER (fh);
+    sftpfs_super_t *super = SFTP_SUPER (fh->ino->super);
+    char *name;
+    const GString *fixfname;
+
+    (void) mode;
+    mc_return_val_if_error (mcerror, FALSE);
+
+    name = vfs_s_fullpath (vfs_sftpfs_ops, fh->ino);
+    if (name == NULL)
+        return FALSE;
+
+    if ((flags & O_CREAT) != 0 || (flags & O_WRONLY) != 0)
+    {
+        sftp_open_flags = (flags & O_WRONLY) != 0 ? LIBSSH2_FXF_WRITE : 0;
+        sftp_open_flags |= (flags & O_CREAT) != 0 ? LIBSSH2_FXF_CREAT : 0;
+        if ((flags & O_APPEND) != 0)
+        {
+            sftp_open_flags |= LIBSSH2_FXF_APPEND;
+            do_append = TRUE;
+        }
+        sftp_open_flags |= (flags & O_TRUNC) != 0 ? LIBSSH2_FXF_TRUNC : 0;
+
+        sftp_open_mode = LIBSSH2_SFTP_S_IRUSR |
+            LIBSSH2_SFTP_S_IWUSR | LIBSSH2_SFTP_S_IRGRP | LIBSSH2_SFTP_S_IROTH;
+    }
+    else
+        sftp_open_flags = LIBSSH2_FXF_READ;
+
+    fixfname = sftpfs_fix_filename (name);
+
+    while (TRUE)
+    {
+        int libssh_errno;
+
+        file->handle =
+            libssh2_sftp_open_ex (super->sftp_session, fixfname->str, fixfname->len,
+                                  sftp_open_flags, sftp_open_mode, LIBSSH2_SFTP_OPENFILE);
+        if (file->handle != NULL)
+            break;
+
+        libssh_errno = libssh2_session_last_errno (super->session);
+        if (libssh_errno != LIBSSH2_ERROR_EAGAIN)
+        {
+            sftpfs_ssherror_to_gliberror (super, libssh_errno, mcerror);
+            g_free (name);
+            return FALSE;
+        }
+    }
+
+    g_free (name);
+
+    file->flags = flags;
+    file->mode = mode;
+
+    if (do_append)
+    {
+        struct stat file_info = {
+            .st_dev = 0
+        };
+        /* In case of
+
+           struct stat file_info = { 0 };
+
+           gcc < 4.7 [1] generates the following:
+
+           error: missing initializer [-Werror=missing-field-initializers]
+           error: (near initialization for 'file_info.st_dev') [-Werror=missing-field-initializers]
+
+           [1] http://stackoverflow.com/questions/13373695/how-to-remove-the-warning-in-gcc-4-6-missing-initializer-wmissing-field-initi/27461062#27461062
+         */
+
+        if (sftpfs_fstat (fh, &file_info, mcerror) == 0)
+            libssh2_sftp_seek64 (file->handle, file_info.st_size);
+    }
+    return TRUE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Stats the file specified by the file descriptor.
+ *
+ * @param data    file handler
+ * @param buf     buffer for store stat-info
+ * @param mcerror pointer to the error handler
+ * @return 0 if success, negative value otherwise
+ */
+
+int
+sftpfs_fstat (void *data, struct stat *buf, GError ** mcerror)
+{
+    int res;
+    LIBSSH2_SFTP_ATTRIBUTES attrs;
+    vfs_file_handler_t *fh = VFS_FILE_HANDLER (data);
+    sftpfs_file_handler_t *sftpfs_fh = (sftpfs_file_handler_t *) data;
+    struct vfs_s_super *super = VFS_FILE_HANDLER_SUPER (fh);
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+
+    mc_return_val_if_error (mcerror, -1);
+
+    if (sftpfs_fh->handle == NULL)
+        return -1;
+
+    do
+    {
+        int err;
+
+        res = libssh2_sftp_fstat_ex (sftpfs_fh->handle, &attrs, 0);
+        if (res >= 0)
+            break;
+
+        err = sftpfs_file__handle_error (sftpfs_super, res, mcerror);
+        if (err < 0)
+            return err;
+    }
+    while (res == LIBSSH2_ERROR_EAGAIN);
+
+    sftpfs_attr_to_stat (&attrs, buf);
+
+    return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Read up to 'count' bytes from the file descriptor 'fh' to the buffer starting at 'buffer'.
+ *
+ * @param fh      file handler
+ * @param buffer  buffer for data
+ * @param count   data size
+ * @param mcerror pointer to the error handler
+ *
+ * @return 0 on success, negative value otherwise
+ */
+
+ssize_t
+sftpfs_read_file (vfs_file_handler_t * fh, char *buffer, size_t count, GError ** mcerror)
+{
+    ssize_t rc;
+    sftpfs_file_handler_t *file = SFTP_FILE_HANDLER (fh);
+    sftpfs_super_t *super;
+
+    mc_return_val_if_error (mcerror, -1);
+
+    if (fh == NULL)
+    {
+        mc_propagate_error (mcerror, 0, "%s",
+                            _("sftp: No file handler data present for reading file"));
+        return -1;
+    }
+
+    super = SFTP_SUPER (VFS_FILE_HANDLER_SUPER (fh));
+
+    do
+    {
+        int err;
+
+        rc = libssh2_sftp_read (file->handle, buffer, count);
+        if (rc >= 0)
+            break;
+
+        err = sftpfs_file__handle_error (super, (int) rc, mcerror);
+        if (err < 0)
+            return err;
+    }
+    while (rc == LIBSSH2_ERROR_EAGAIN);
+
+    fh->pos = (off_t) libssh2_sftp_tell64 (file->handle);
+
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Write up to 'count' bytes from  the buffer starting at 'buffer' to the descriptor 'fh'.
+ *
+ * @param fh      file handler
+ * @param buffer  buffer for data
+ * @param count   data size
+ * @param mcerror pointer to the error handler
+ *
+ * @return 0 on success, negative value otherwise
+ */
+
+ssize_t
+sftpfs_write_file (vfs_file_handler_t * fh, const char *buffer, size_t count, GError ** mcerror)
+{
+    ssize_t rc;
+    sftpfs_file_handler_t *file = SFTP_FILE_HANDLER (fh);
+    sftpfs_super_t *super = SFTP_SUPER (VFS_FILE_HANDLER_SUPER (fh));
+
+    mc_return_val_if_error (mcerror, -1);
+
+    fh->pos = (off_t) libssh2_sftp_tell64 (file->handle);
+
+    do
+    {
+        int err;
+
+        rc = libssh2_sftp_write (file->handle, buffer, count);
+        if (rc >= 0)
+            break;
+
+        err = sftpfs_file__handle_error (super, (int) rc, mcerror);
+        if (err < 0)
+            return err;
+    }
+    while (rc == LIBSSH2_ERROR_EAGAIN);
+
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Close a file descriptor.
+ *
+ * @param fh      file handler
+ * @param mcerror pointer to the error handler
+ *
+ * @return 0 on success, negative value otherwise
+ */
+
+int
+sftpfs_close_file (vfs_file_handler_t * fh, GError ** mcerror)
+{
+    int ret;
+
+    mc_return_val_if_error (mcerror, -1);
+
+    ret = libssh2_sftp_close (SFTP_FILE_HANDLER (fh)->handle);
+
+    return ret == 0 ? 0 : -1;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Reposition the offset of the open file associated with the file descriptor.
+ *
+ * @param fh      file handler
+ * @param offset  file offset
+ * @param whence  method of seek (at begin, at current, at end)
+ * @param mcerror pointer to the error handler
+ *
+ * @return 0 on success, negative value otherwise
+ */
+
+off_t
+sftpfs_lseek (vfs_file_handler_t * fh, off_t offset, int whence, GError ** mcerror)
+{
+    sftpfs_file_handler_t *file = SFTP_FILE_HANDLER (fh);
+
+    mc_return_val_if_error (mcerror, 0);
+
+    switch (whence)
+    {
+    case SEEK_SET:
+        /* Need reopen file because:
+           "You MUST NOT seek during writing or reading a file with SFTP, as the internals use
+           outstanding packets and changing the "file position" during transit will results in
+           badness." */
+        if (fh->pos > offset || offset == 0)
+        {
+            sftpfs_reopen (fh, mcerror);
+            mc_return_val_if_error (mcerror, 0);
+        }
+        fh->pos = offset;
+        break;
+    case SEEK_CUR:
+        fh->pos += offset;
+        break;
+    case SEEK_END:
+        if (fh->pos > fh->ino->st.st_size - offset)
+        {
+            sftpfs_reopen (fh, mcerror);
+            mc_return_val_if_error (mcerror, 0);
+        }
+        fh->pos = fh->ino->st.st_size - offset;
+        break;
+    default:
+        break;
+    }
+
+    libssh2_sftp_seek64 (file->handle, fh->pos);
+    fh->pos = (off_t) libssh2_sftp_tell64 (file->handle);
+
+    return fh->pos;
+}
+
+/* --------------------------------------------------------------------------------------------- */
diff --git a/src/vfs/sftpfs/internal.c b/src/vfs/sftpfs/internal.c
new file mode 100644
index 0000000..9c9581e
--- /dev/null
+++ b/src/vfs/sftpfs/internal.c
@@ -0,0 +1,623 @@
+/* Virtual File System: SFTP file system.
+   The internal functions
+
+   Copyright (C) 2011-2022
+   Free Software Foundation, Inc.
+
+   Written by:
+   Ilia Maslakov <il.smind@gmail.com>, 2011
+   Slava Zanko <slavazanko@gmail.com>, 2011, 2012
+
+   This file is part of the Midnight Commander.
+
+   The Midnight Commander is free software: you can redistribute it
+   and/or modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   The Midnight Commander is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <errno.h>
+
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#else
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
+#include "lib/global.h"
+#include "lib/util.h"
+
+#include "internal.h"
+
+/*** global variables ****************************************************************************/
+
+GString *sftpfs_filename_buffer = NULL;
+
+/*** file scope macro definitions ****************************************************************/
+
+/*** file scope type declarations ****************************************************************/
+
+/*** file scope variables ************************************************************************/
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+/* Adjust block size and number of blocks */
+
+static void
+sftpfs_blksize (struct stat *s)
+{
+#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
+    s->st_blksize = LIBSSH2_CHANNEL_WINDOW_DEFAULT;     /* FIXME */
+#endif /* HAVE_STRUCT_STAT_ST_BLKSIZE */
+    vfs_adjust_stat (s);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Awaiting for any activity on socket.
+ *
+ * @param super extra data for SFTP connection
+ * @param mcerror    pointer to the error object
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_internal_waitsocket (sftpfs_super_t * super, GError ** mcerror)
+{
+    struct timeval timeout = { 10, 0 };
+    fd_set fd;
+    fd_set *writefd = NULL;
+    fd_set *readfd = NULL;
+    int dir, ret;
+
+    mc_return_val_if_error (mcerror, -1);
+
+    FD_ZERO (&fd);
+    FD_SET (super->socket_handle, &fd);
+
+    /* now make sure we wait in the correct direction */
+    dir = libssh2_session_block_directions (super->session);
+
+    if ((dir & LIBSSH2_SESSION_BLOCK_INBOUND) != 0)
+        readfd = &fd;
+
+    if ((dir & LIBSSH2_SESSION_BLOCK_OUTBOUND) != 0)
+        writefd = &fd;
+
+    ret = select (super->socket_handle + 1, readfd, writefd, NULL, &timeout);
+    if (ret < 0)
+    {
+        int my_errno = errno;
+
+        mc_propagate_error (mcerror, my_errno, _("sftp: socket error: %s"),
+                            unix_error_string (my_errno));
+    }
+
+    return ret;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static gboolean
+sftpfs_op_init (sftpfs_super_t ** super, const vfs_path_element_t ** path_element,
+                const vfs_path_t * vpath, GError ** mcerror)
+{
+    struct vfs_s_super *lc_super = NULL;
+
+    mc_return_val_if_error (mcerror, FALSE);
+
+    if (vfs_s_get_path (vpath, &lc_super, 0) == NULL)
+        return FALSE;
+
+    if (lc_super == NULL)
+        return FALSE;
+
+    *super = SFTP_SUPER (lc_super);
+
+    if ((*super)->sftp_session == NULL)
+        return FALSE;
+
+    *path_element = vfs_path_get_by_index (vpath, -1);
+
+    return TRUE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+sftpfs_stat_init (sftpfs_super_t ** super, const vfs_path_element_t ** path_element,
+                  const vfs_path_t * vpath, GError ** mcerror, int stat_type,
+                  LIBSSH2_SFTP_ATTRIBUTES * attrs)
+{
+    const GString *fixfname;
+    int res;
+
+    if (!sftpfs_op_init (super, path_element, vpath, mcerror))
+        return -1;
+
+    fixfname = sftpfs_fix_filename ((*path_element)->path);
+
+    do
+    {
+        res = libssh2_sftp_stat_ex ((*super)->sftp_session, fixfname->str, fixfname->len,
+                                    stat_type, attrs);
+        if (res >= 0)
+            break;
+
+        if (sftpfs_is_sftp_error ((*super)->sftp_session, res, LIBSSH2_FX_PERMISSION_DENIED))
+            return -EACCES;
+
+        if (sftpfs_is_sftp_error ((*super)->sftp_session, res, LIBSSH2_FX_NO_SUCH_FILE))
+            return -ENOENT;
+
+        if (!sftpfs_waitsocket (*super, res, mcerror))
+            return -1;
+    }
+    while (res == LIBSSH2_ERROR_EAGAIN);
+
+    return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+sftpfs_waitsocket (sftpfs_super_t * super, int sftp_res, GError ** mcerror)
+{
+    if (sftp_res != LIBSSH2_ERROR_EAGAIN)
+    {
+        sftpfs_ssherror_to_gliberror (super, sftp_res, mcerror);
+        return FALSE;
+    }
+
+    sftpfs_internal_waitsocket (super, mcerror);
+
+    return (mcerror == NULL || *mcerror == NULL);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+sftpfs_is_sftp_error (LIBSSH2_SFTP * sftp_session, int sftp_res, int sftp_error)
+{
+    return (sftp_res == LIBSSH2_ERROR_SFTP_PROTOCOL &&
+            libssh2_sftp_last_error (sftp_session) == (unsigned long) sftp_error);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Convert libssh error to GError object.
+ *
+ * @param super   extra data for SFTP connection
+ * @param libssh_errno errno from libssh
+ * @param mcerror      pointer to the error object
+ */
+
+void
+sftpfs_ssherror_to_gliberror (sftpfs_super_t * super, int libssh_errno, GError ** mcerror)
+{
+    char *err = NULL;
+    int err_len;
+
+    mc_return_if_error (mcerror);
+
+    libssh2_session_last_error (super->session, &err, &err_len, 1);
+    if (libssh_errno == LIBSSH2_ERROR_SFTP_PROTOCOL && super->sftp_session != NULL)
+        mc_propagate_error (mcerror, libssh_errno, "%s %lu", err,
+                            libssh2_sftp_last_error (super->sftp_session));
+    else
+        mc_propagate_error (mcerror, libssh_errno, "%s", err);
+    g_free (err);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Fix filename for SFTP operations: add leading slash to file name.
+ *
+ * @param file_name file name
+ * @param length length of returned string
+ *
+ * @return pointer to string that contains the file name with leading slash
+ */
+
+const GString *
+sftpfs_fix_filename (const char *file_name)
+{
+    g_string_printf (sftpfs_filename_buffer, "%c%s", PATH_SEP, file_name);
+    return sftpfs_filename_buffer;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+sftpfs_attr_to_stat (const LIBSSH2_SFTP_ATTRIBUTES * attrs, struct stat *s)
+{
+    if ((attrs->flags & LIBSSH2_SFTP_ATTR_UIDGID) != 0)
+    {
+        s->st_uid = attrs->uid;
+        s->st_gid = attrs->gid;
+    }
+
+    if ((attrs->flags & LIBSSH2_SFTP_ATTR_ACMODTIME) != 0)
+    {
+        s->st_atime = attrs->atime;
+        s->st_mtime = attrs->mtime;
+        s->st_ctime = attrs->mtime;
+#ifdef HAVE_STRUCT_STAT_ST_MTIM
+        s->st_atim.tv_nsec = s->st_mtim.tv_nsec = s->st_ctim.tv_nsec = 0;
+#endif
+    }
+
+    if ((attrs->flags & LIBSSH2_SFTP_ATTR_SIZE) != 0)
+    {
+        s->st_size = attrs->filesize;
+        sftpfs_blksize (s);
+    }
+
+    if ((attrs->flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) != 0)
+        s->st_mode = attrs->permissions;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Getting information about a symbolic link.
+ *
+ * @param vpath   path to file, directory or symbolic link
+ * @param buf     buffer for store stat-info
+ * @param mcerror pointer to error object
+ * @return 0 if success, negative value otherwise
+ */
+
+int
+sftpfs_lstat (const vfs_path_t * vpath, struct stat *buf, GError ** mcerror)
+{
+    sftpfs_super_t *super = NULL;
+    const vfs_path_element_t *path_element = NULL;
+    LIBSSH2_SFTP_ATTRIBUTES attrs;
+    int res;
+
+    res = sftpfs_stat_init (&super, &path_element, vpath, mcerror, LIBSSH2_SFTP_LSTAT, &attrs);
+    if (res >= 0)
+    {
+        sftpfs_attr_to_stat (&attrs, buf);
+        res = 0;
+    }
+
+    return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Getting information about a file or directory.
+ *
+ * @param vpath   path to file or directory
+ * @param buf     buffer for store stat-info
+ * @param mcerror pointer to error object
+ * @return 0 if success, negative value otherwise
+ */
+
+int
+sftpfs_stat (const vfs_path_t * vpath, struct stat *buf, GError ** mcerror)
+{
+    sftpfs_super_t *super = NULL;
+    const vfs_path_element_t *path_element = NULL;
+    LIBSSH2_SFTP_ATTRIBUTES attrs;
+    int res;
+
+    res = sftpfs_stat_init (&super, &path_element, vpath, mcerror, LIBSSH2_SFTP_STAT, &attrs);
+    if (res >= 0)
+    {
+        buf->st_nlink = 1;
+        sftpfs_attr_to_stat (&attrs, buf);
+        res = 0;
+    }
+
+    return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Read value of a symbolic link.
+ *
+ * @param vpath   path to file or directory
+ * @param buf     buffer for store stat-info
+ * @param size    buffer size
+ * @param mcerror pointer to error object
+ * @return 0 if success, negative value otherwise
+ */
+
+int
+sftpfs_readlink (const vfs_path_t * vpath, char *buf, size_t size, GError ** mcerror)
+{
+    sftpfs_super_t *super = NULL;
+    const vfs_path_element_t *path_element = NULL;
+    const GString *fixfname;
+    int res;
+
+    if (!sftpfs_op_init (&super, &path_element, vpath, mcerror))
+        return -1;
+
+    fixfname = sftpfs_fix_filename (path_element->path);
+
+    do
+    {
+        res =
+            libssh2_sftp_symlink_ex (super->sftp_session, fixfname->str, fixfname->len, buf, size,
+                                     LIBSSH2_SFTP_READLINK);
+        if (res >= 0)
+            break;
+
+        if (!sftpfs_waitsocket (super, res, mcerror))
+            return -1;
+    }
+    while (res == LIBSSH2_ERROR_EAGAIN);
+
+    return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Create symlink to file or directory
+ *
+ * @param vpath1  path to file or directory
+ * @param vpath2  path to symlink
+ * @param mcerror pointer to error object
+ * @return 0 if success, negative value otherwise
+ */
+
+int
+sftpfs_symlink (const vfs_path_t * vpath1, const vfs_path_t * vpath2, GError ** mcerror)
+{
+    sftpfs_super_t *super = NULL;
+    const vfs_path_element_t *path_element1;
+    const vfs_path_element_t *path_element2 = NULL;
+    const char *path1;
+    size_t path1_len;
+    const GString *ctmp_path;
+    char *tmp_path;
+    unsigned int tmp_path_len;
+    int res;
+
+    if (!sftpfs_op_init (&super, &path_element2, vpath2, mcerror))
+        return -1;
+
+    ctmp_path = sftpfs_fix_filename (path_element2->path);
+    tmp_path = g_strndup (ctmp_path->str, ctmp_path->len);
+    tmp_path_len = ctmp_path->len;
+
+    path_element1 = vfs_path_get_by_index (vpath1, -1);
+    path1 = path_element1->path;
+    path1_len = strlen (path1);
+
+    do
+    {
+        res =
+            libssh2_sftp_symlink_ex (super->sftp_session, path1, path1_len, tmp_path, tmp_path_len,
+                                     LIBSSH2_SFTP_SYMLINK);
+        if (res >= 0)
+            break;
+
+        if (!sftpfs_waitsocket (super, res, mcerror))
+        {
+            g_free (tmp_path);
+            return -1;
+        }
+    }
+    while (res == LIBSSH2_ERROR_EAGAIN);
+    g_free (tmp_path);
+
+    return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Changes the times of the file.
+ *
+ * @param vpath   path to file or directory
+ * @param atime   access time
+ * @param mtime   modification time
+ * @param mcerror pointer to error object
+ * @return 0 if success, negative value otherwise
+ */
+
+int
+sftpfs_utime (const vfs_path_t * vpath, time_t atime, time_t mtime, GError ** mcerror)
+{
+    sftpfs_super_t *super = NULL;
+    const vfs_path_element_t *path_element = NULL;
+    LIBSSH2_SFTP_ATTRIBUTES attrs;
+    const GString *fixfname;
+    int res;
+
+    res = sftpfs_stat_init (&super, &path_element, vpath, mcerror, LIBSSH2_SFTP_LSTAT, &attrs);
+    if (res < 0)
+        return res;
+
+    attrs.flags = LIBSSH2_SFTP_ATTR_ACMODTIME;
+    attrs.atime = atime;
+    attrs.mtime = mtime;
+
+    fixfname = sftpfs_fix_filename (path_element->path);
+
+    do
+    {
+        res =
+            libssh2_sftp_stat_ex (super->sftp_session, fixfname->str, fixfname->len,
+                                  LIBSSH2_SFTP_SETSTAT, &attrs);
+        if (res >= 0)
+            break;
+
+        if (sftpfs_is_sftp_error (super->sftp_session, res, LIBSSH2_FX_NO_SUCH_FILE))
+            return -ENOENT;
+
+        if (sftpfs_is_sftp_error (super->sftp_session, res, LIBSSH2_FX_FAILURE))
+        {
+            res = 0;            /* need something like ftpfs_ignore_chattr_errors */
+            break;
+        }
+
+        if (!sftpfs_waitsocket (super, res, mcerror))
+            return -1;
+    }
+    while (res == LIBSSH2_ERROR_EAGAIN);
+
+    return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Changes the permissions of the file.
+ *
+ * @param vpath   path to file or directory
+ * @param mode    mode (see man 2 open)
+ * @param mcerror pointer to error object
+ * @return 0 if success, negative value otherwise
+ */
+
+int
+sftpfs_chmod (const vfs_path_t * vpath, mode_t mode, GError ** mcerror)
+{
+    sftpfs_super_t *super = NULL;
+    const vfs_path_element_t *path_element = NULL;
+    LIBSSH2_SFTP_ATTRIBUTES attrs;
+    const GString *fixfname;
+    int res;
+
+    res = sftpfs_stat_init (&super, &path_element, vpath, mcerror, LIBSSH2_SFTP_LSTAT, &attrs);
+    if (res < 0)
+        return res;
+
+    attrs.flags = LIBSSH2_SFTP_ATTR_PERMISSIONS;
+    attrs.permissions = mode;
+
+    fixfname = sftpfs_fix_filename (path_element->path);
+
+    do
+    {
+        res =
+            libssh2_sftp_stat_ex (super->sftp_session, fixfname->str, fixfname->len,
+                                  LIBSSH2_SFTP_SETSTAT, &attrs);
+        if (res >= 0)
+            break;
+
+        if (sftpfs_is_sftp_error (super->sftp_session, res, LIBSSH2_FX_NO_SUCH_FILE))
+            return -ENOENT;
+
+        if (sftpfs_is_sftp_error (super->sftp_session, res, LIBSSH2_FX_FAILURE))
+        {
+            res = 0;            /* need something like ftpfs_ignore_chattr_errors */
+            break;
+        }
+
+        if (!sftpfs_waitsocket (super, res, mcerror))
+            return -1;
+    }
+    while (res == LIBSSH2_ERROR_EAGAIN);
+
+    return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Delete a name from the file system.
+ *
+ * @param vpath   path to file or directory
+ * @param mcerror pointer to error object
+ * @return 0 if success, negative value otherwise
+ */
+
+int
+sftpfs_unlink (const vfs_path_t * vpath, GError ** mcerror)
+{
+    sftpfs_super_t *super = NULL;
+    const vfs_path_element_t *path_element = NULL;
+    const GString *fixfname;
+    int res;
+
+    if (!sftpfs_op_init (&super, &path_element, vpath, mcerror))
+        return -1;
+
+    fixfname = sftpfs_fix_filename (path_element->path);
+
+    do
+    {
+        res = libssh2_sftp_unlink_ex (super->sftp_session, fixfname->str, fixfname->len);
+        if (res >= 0)
+            break;
+
+        if (!sftpfs_waitsocket (super, res, mcerror))
+            return -1;
+    }
+    while (res == LIBSSH2_ERROR_EAGAIN);
+
+    return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Rename a file, moving it between directories if required.
+ *
+ * @param vpath1   path to source file or directory
+ * @param vpath2   path to destination file or directory
+ * @param mcerror  pointer to error object
+ * @return 0 if success, negative value otherwise
+ */
+
+int
+sftpfs_rename (const vfs_path_t * vpath1, const vfs_path_t * vpath2, GError ** mcerror)
+{
+    sftpfs_super_t *super = NULL;
+    const vfs_path_element_t *path_element1;
+    const vfs_path_element_t *path_element2 = NULL;
+    const GString *ctmp_path;
+    char *tmp_path;
+    unsigned int tmp_path_len;
+    const GString *fixfname;
+    int res;
+
+    if (!sftpfs_op_init (&super, &path_element2, vpath2, mcerror))
+        return -1;
+
+    ctmp_path = sftpfs_fix_filename (path_element2->path);
+    tmp_path = g_strndup (ctmp_path->str, ctmp_path->len);
+    tmp_path_len = ctmp_path->len;
+
+    path_element1 = vfs_path_get_by_index (vpath1, -1);
+
+    fixfname = sftpfs_fix_filename (path_element1->path);
+
+    do
+    {
+        res =
+            libssh2_sftp_rename_ex (super->sftp_session, fixfname->str, fixfname->len, tmp_path,
+                                    tmp_path_len, LIBSSH2_SFTP_SYMLINK);
+        if (res >= 0)
+            break;
+
+        if (!sftpfs_waitsocket (super, res, mcerror))
+        {
+            g_free (tmp_path);
+            return -1;
+        }
+    }
+    while (res == LIBSSH2_ERROR_EAGAIN);
+    g_free (tmp_path);
+
+    return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
diff --git a/src/vfs/sftpfs/internal.h b/src/vfs/sftpfs/internal.h
new file mode 100644
index 0000000..bf3fd30
--- /dev/null
+++ b/src/vfs/sftpfs/internal.h
@@ -0,0 +1,110 @@
+/**
+ * \file
+ * \brief Header: SFTP FS
+ */
+
+#ifndef MC__VFS_SFTPFS_INTERNAL_H
+#define MC__VFS_SFTPFS_INTERNAL_H
+
+#include <libssh2.h>
+#include <libssh2_sftp.h>
+
+#include "lib/vfs/vfs.h"
+#include "lib/vfs/xdirentry.h"
+
+/*** typedefs(not structures) and defined constants **********************************************/
+
+#define SFTP_DEFAULT_PORT 22
+
+/* LIBSSH2_INVALID_SOCKET is defined in libssh2 >= 1.4.1 */
+#ifndef LIBSSH2_INVALID_SOCKET
+#define LIBSSH2_INVALID_SOCKET -1
+#endif
+
+#define SFTP_SUPER(super) ((sftpfs_super_t *) (super))
+
+/*** enums ***************************************************************************************/
+
+typedef enum
+{
+    NONE = 0,
+    PUBKEY = (1 << 0),
+    PASSWORD = (1 << 1),
+    AGENT = (1 << 2)
+} sftpfs_auth_type_t;
+
+/*** structures declarations (and typedefs of structures)*****************************************/
+
+typedef struct
+{
+    struct vfs_s_super base;
+
+    sftpfs_auth_type_t auth_type;
+    sftpfs_auth_type_t config_auth_type;
+
+    LIBSSH2_KNOWNHOSTS *known_hosts;
+    char *known_hosts_file;
+
+    LIBSSH2_SESSION *session;
+    LIBSSH2_SFTP *sftp_session;
+
+    LIBSSH2_AGENT *agent;
+
+    char *pubkey;
+    char *privkey;
+
+    int socket_handle;
+    const char *ip_address;
+    vfs_path_element_t *original_connection_info;
+} sftpfs_super_t;
+
+/*** global variables defined in .c file *********************************************************/
+
+extern GString *sftpfs_filename_buffer;
+extern struct vfs_s_subclass sftpfs_subclass;
+extern struct vfs_class *vfs_sftpfs_ops;
+
+/*** declarations of public functions ************************************************************/
+
+void sftpfs_init_config_variables_patterns (void);
+void sftpfs_deinit_config_variables_patterns (void);
+
+gboolean sftpfs_is_sftp_error (LIBSSH2_SFTP * sftp_session, int sftp_res, int sftp_error);
+void sftpfs_ssherror_to_gliberror (sftpfs_super_t * super, int libssh_errno, GError ** mcerror);
+gboolean sftpfs_waitsocket (sftpfs_super_t * super, int sftp_res, GError ** mcerror);
+
+const GString *sftpfs_fix_filename (const char *file_name);
+void sftpfs_attr_to_stat (const LIBSSH2_SFTP_ATTRIBUTES * attrs, struct stat *s);
+int sftpfs_lstat (const vfs_path_t * vpath, struct stat *buf, GError ** mcerror);
+int sftpfs_stat (const vfs_path_t * vpath, struct stat *buf, GError ** mcerror);
+int sftpfs_readlink (const vfs_path_t * vpath, char *buf, size_t size, GError ** mcerror);
+int sftpfs_symlink (const vfs_path_t * vpath1, const vfs_path_t * vpath2, GError ** mcerror);
+int sftpfs_utime (const vfs_path_t * vpath, time_t atime, time_t mtime, GError ** mcerror);
+int sftpfs_chmod (const vfs_path_t * vpath, mode_t mode, GError ** mcerror);
+int sftpfs_unlink (const vfs_path_t * vpath, GError ** mcerror);
+int sftpfs_rename (const vfs_path_t * vpath1, const vfs_path_t * vpath2, GError ** mcerror);
+
+void sftpfs_fill_connection_data_from_config (struct vfs_s_super *super, GError ** mcerror);
+int sftpfs_open_connection (struct vfs_s_super *super, GError ** mcerror);
+void sftpfs_close_connection (struct vfs_s_super *super, const char *shutdown_message,
+                              GError ** mcerror);
+
+vfs_file_handler_t *sftpfs_fh_new (struct vfs_s_inode *ino, gboolean changed);
+
+void *sftpfs_opendir (const vfs_path_t * vpath, GError ** mcerror);
+struct vfs_dirent *sftpfs_readdir (void *data, GError ** mcerror);
+int sftpfs_closedir (void *data, GError ** mcerror);
+int sftpfs_mkdir (const vfs_path_t * vpath, mode_t mode, GError ** mcerror);
+int sftpfs_rmdir (const vfs_path_t * vpath, GError ** mcerror);
+
+gboolean sftpfs_open_file (vfs_file_handler_t * fh, int flags, mode_t mode, GError ** mcerror);
+ssize_t sftpfs_read_file (vfs_file_handler_t * fh, char *buffer, size_t count, GError ** mcerror);
+ssize_t sftpfs_write_file (vfs_file_handler_t * fh, const char *buffer, size_t count,
+                           GError ** mcerror);
+int sftpfs_close_file (vfs_file_handler_t * fh, GError ** mcerror);
+int sftpfs_fstat (void *data, struct stat *buf, GError ** mcerror);
+off_t sftpfs_lseek (vfs_file_handler_t * fh, off_t offset, int whence, GError ** mcerror);
+
+/*** inline functions ****************************************************************************/
+
+#endif /* MC__VFS_SFTPFS_INTERNAL_H */
diff --git a/src/vfs/sftpfs/sftpfs.c b/src/vfs/sftpfs/sftpfs.c
new file mode 100644
index 0000000..55e5ada
--- /dev/null
+++ b/src/vfs/sftpfs/sftpfs.c
@@ -0,0 +1,867 @@
+/* Virtual File System: SFTP file system.
+   The interface function
+
+   Copyright (C) 2011-2022
+   Free Software Foundation, Inc.
+
+   Written by:
+   Ilia Maslakov <il.smind@gmail.com>, 2011
+   Slava Zanko <slavazanko@gmail.com>, 2011-2013
+   Andrew Borodin <aborodin@vmail.ru>, 2021-2022
+
+   This file is part of the Midnight Commander.
+
+   The Midnight Commander is free software: you can redistribute it
+   and/or modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   The Midnight Commander is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>             /* memset() */
+
+#include "lib/global.h"
+#include "lib/vfs/netutil.h"
+#include "lib/vfs/utilvfs.h"
+#include "lib/vfs/gc.h"
+#include "lib/widget.h"
+#include "lib/tty/tty.h"        /* tty_enable_interrupt_key () */
+
+#include "internal.h"
+
+#include "sftpfs.h"
+
+/*** global variables ****************************************************************************/
+
+struct vfs_s_subclass sftpfs_subclass;
+struct vfs_class *vfs_sftpfs_ops = VFS_CLASS (&sftpfs_subclass);        /* used in file.c */
+
+/*** file scope macro definitions ****************************************************************/
+
+/*** file scope type declarations ****************************************************************/
+
+/*** file scope variables ************************************************************************/
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for VFS-class init action.
+ *
+ * @param me structure of VFS class
+ */
+
+static int
+sftpfs_cb_init (struct vfs_class *me)
+{
+    (void) me;
+
+    if (libssh2_init (0) != 0)
+        return 0;
+
+    sftpfs_filename_buffer = g_string_new ("");
+    sftpfs_init_config_variables_patterns ();
+    return 1;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for VFS-class deinit action.
+ *
+ * @param me structure of VFS class
+ */
+
+static void
+sftpfs_cb_done (struct vfs_class *me)
+{
+    (void) me;
+
+    sftpfs_deinit_config_variables_patterns ();
+    g_string_free (sftpfs_filename_buffer, TRUE);
+    libssh2_exit ();
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for opening file.
+ *
+ * @param vpath path to file
+ * @param flags flags (see man 2 open)
+ * @param mode  mode (see man 2 open)
+ * @return file data handler if success, NULL otherwise
+ */
+
+static void *
+sftpfs_cb_open (const vfs_path_t * vpath, int flags, mode_t mode)
+{
+    vfs_file_handler_t *fh;
+    const vfs_path_element_t *path_element;
+    struct vfs_s_super *super;
+    const char *path_super;
+    struct vfs_s_inode *path_inode;
+    GError *mcerror = NULL;
+    gboolean is_changed = FALSE;
+
+    path_element = vfs_path_get_by_index (vpath, -1);
+
+    path_super = vfs_s_get_path (vpath, &super, 0);
+    if (path_super == NULL)
+        return NULL;
+
+    path_inode = vfs_s_find_inode (path_element->class, super, path_super, LINK_FOLLOW, FL_NONE);
+    if (path_inode != NULL && ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)))
+    {
+        path_element->class->verrno = EEXIST;
+        return NULL;
+    }
+
+    if (path_inode == NULL)
+    {
+        char *dirname, *name;
+        struct vfs_s_entry *ent;
+        struct vfs_s_inode *dir;
+
+        dirname = g_path_get_dirname (path_super);
+        name = g_path_get_basename (path_super);
+        dir = vfs_s_find_inode (path_element->class, super, dirname, LINK_FOLLOW, FL_DIR);
+        if (dir == NULL)
+        {
+            g_free (dirname);
+            g_free (name);
+            return NULL;
+        }
+        ent = vfs_s_generate_entry (path_element->class, name, dir, 0755);
+        path_inode = ent->ino;
+        vfs_s_insert_entry (path_element->class, dir, ent);
+        g_free (dirname);
+        g_free (name);
+        is_changed = TRUE;
+    }
+
+    if (S_ISDIR (path_inode->st.st_mode))
+    {
+        path_element->class->verrno = EISDIR;
+        return NULL;
+    }
+
+    fh = sftpfs_fh_new (path_inode, is_changed);
+
+    if (!sftpfs_open_file (fh, flags, mode, &mcerror))
+    {
+        mc_error_message (&mcerror, NULL);
+        g_free (fh);
+        return NULL;
+    }
+
+    vfs_rmstamp (path_element->class, (vfsid) super);
+    super->fd_usage++;
+    fh->ino->st.st_nlink++;
+    return fh;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for opening directory.
+ *
+ * @param vpath path to directory
+ * @return directory data handler if success, NULL otherwise
+ */
+
+static void *
+sftpfs_cb_opendir (const vfs_path_t * vpath)
+{
+    GError *mcerror = NULL;
+    void *ret_value;
+
+    /* reset interrupt flag */
+    tty_got_interrupt ();
+
+    ret_value = sftpfs_opendir (vpath, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return ret_value;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for reading directory entry.
+ *
+ * @param data directory data handler
+ * @return information about direntry if success, NULL otherwise
+ */
+
+static struct vfs_dirent *
+sftpfs_cb_readdir (void *data)
+{
+    GError *mcerror = NULL;
+    struct vfs_dirent *sftpfs_dirent;
+
+    if (tty_got_interrupt ())
+    {
+        tty_disable_interrupt_key ();
+        return NULL;
+    }
+
+    sftpfs_dirent = sftpfs_readdir (data, &mcerror);
+    if (!mc_error_message (&mcerror, NULL))
+    {
+        if (sftpfs_dirent != NULL)
+            vfs_print_message (_("sftp: (Ctrl-G break) Listing... %s"), sftpfs_dirent->d_name);
+        else
+            vfs_print_message ("%s", _("sftp: Listing done."));
+    }
+
+    return sftpfs_dirent;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for closing directory.
+ *
+ * @param data directory data handler
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_closedir (void *data)
+{
+    int rc;
+    GError *mcerror = NULL;
+
+    rc = sftpfs_closedir (data, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for lstat VFS-function.
+ *
+ * @param vpath path to file or directory
+ * @param buf   buffer for store stat-info
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_lstat (const vfs_path_t * vpath, struct stat *buf)
+{
+    int rc;
+    GError *mcerror = NULL;
+
+    rc = sftpfs_lstat (vpath, buf, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for stat VFS-function.
+ *
+ * @param vpath path to file or directory
+ * @param buf   buffer for store stat-info
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_stat (const vfs_path_t * vpath, struct stat *buf)
+{
+    int rc;
+    GError *mcerror = NULL;
+
+    rc = sftpfs_stat (vpath, buf, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for fstat VFS-function.
+ *
+ * @param data file data handler
+ * @param buf  buffer for store stat-info
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_fstat (void *data, struct stat *buf)
+{
+    int rc;
+    GError *mcerror = NULL;
+
+    rc = sftpfs_fstat (data, buf, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for readlink VFS-function.
+ *
+ * @param vpath path to file or directory
+ * @param buf   buffer for store stat-info
+ * @param size  buffer size
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_readlink (const vfs_path_t * vpath, char *buf, size_t size)
+{
+    int rc;
+    GError *mcerror = NULL;
+
+    rc = sftpfs_readlink (vpath, buf, size, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for utime VFS-function.
+ *
+ * @param vpath path to file or directory
+ * @param times access and modification time to set
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_utime (const vfs_path_t * vpath, mc_timesbuf_t * times)
+{
+    int rc;
+    GError *mcerror = NULL;
+
+#ifdef HAVE_UTIMENSAT
+    time_t atime = (*times)[0].tv_sec;
+    time_t mtime = (*times)[1].tv_sec;
+#else
+    time_t atime = times->actime;
+    time_t mtime = times->modtime;
+#endif
+
+    rc = sftpfs_utime (vpath, atime, mtime, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for symlink VFS-function.
+ *
+ * @param vpath1 path to file or directory
+ * @param vpath2 path to symlink
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_symlink (const vfs_path_t * vpath1, const vfs_path_t * vpath2)
+{
+    int rc;
+    GError *mcerror = NULL;
+
+    rc = sftpfs_symlink (vpath1, vpath2, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for symlink VFS-function.
+ *
+ * @param vpath unused
+ * @param mode  unused
+ * @param dev   unused
+ * @return always 0
+ */
+
+static int
+sftpfs_cb_mknod (const vfs_path_t * vpath, mode_t mode, dev_t dev)
+{
+    (void) vpath;
+    (void) mode;
+    (void) dev;
+
+    return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for link VFS-function.
+ *
+ * @param vpath1 unused
+ * @param vpath2 unused
+ * @return always 0
+ */
+
+static int
+sftpfs_cb_link (const vfs_path_t * vpath1, const vfs_path_t * vpath2)
+{
+    (void) vpath1;
+    (void) vpath2;
+
+    return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for chown VFS-function.
+ *
+ * @param vpath unused
+ * @param owner unused
+ * @param group unused
+ * @return always 0
+ */
+
+static int
+sftpfs_cb_chown (const vfs_path_t * vpath, uid_t owner, gid_t group)
+{
+    (void) vpath;
+    (void) owner;
+    (void) group;
+
+    return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for reading file content.
+ *
+ * @param data   file data handler
+ * @param buffer buffer for data
+ * @param count  data size
+ * @return 0 if success, negative value otherwise
+ */
+
+static ssize_t
+sftpfs_cb_read (void *data, char *buffer, size_t count)
+{
+    int rc;
+    GError *mcerror = NULL;
+    vfs_file_handler_t *fh = VFS_FILE_HANDLER (data);
+
+    if (tty_got_interrupt ())
+    {
+        tty_disable_interrupt_key ();
+        return 0;
+    }
+
+    rc = sftpfs_read_file (fh, buffer, count, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for writing file content.
+ *
+ * @param data  file data handler
+ * @param buf   buffer for data
+ * @param count data size
+ * @return 0 if success, negative value otherwise
+ */
+
+static ssize_t
+sftpfs_cb_write (void *data, const char *buf, size_t nbyte)
+{
+    int rc;
+    GError *mcerror = NULL;
+    vfs_file_handler_t *fh = VFS_FILE_HANDLER (data);
+
+    rc = sftpfs_write_file (fh, buf, nbyte, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for close file.
+ *
+ * @param data file data handler
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_close (void *data)
+{
+    int rc;
+    GError *mcerror = NULL;
+    struct vfs_s_super *super = VFS_FILE_HANDLER_SUPER (data);
+    vfs_file_handler_t *fh = VFS_FILE_HANDLER (data);
+
+    super->fd_usage--;
+    if (super->fd_usage == 0)
+        vfs_stamp_create (vfs_sftpfs_ops, super);
+
+    rc = sftpfs_close_file (fh, &mcerror);
+    mc_error_message (&mcerror, NULL);
+
+    if (fh->handle != -1)
+        close (fh->handle);
+
+    vfs_s_free_inode (vfs_sftpfs_ops, fh->ino);
+
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for chmod VFS-function.
+ *
+ * @param vpath path to file or directory
+ * @param mode  mode (see man 2 open)
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_chmod (const vfs_path_t * vpath, mode_t mode)
+{
+    int rc;
+    GError *mcerror = NULL;
+
+    rc = sftpfs_chmod (vpath, mode, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for mkdir VFS-function.
+ *
+ * @param vpath path directory
+ * @param mode  mode (see man 2 open)
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_mkdir (const vfs_path_t * vpath, mode_t mode)
+{
+    int rc;
+    GError *mcerror = NULL;
+
+    rc = sftpfs_mkdir (vpath, mode, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for rmdir VFS-function.
+ *
+ * @param vpath path directory
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_rmdir (const vfs_path_t * vpath)
+{
+    int rc;
+    GError *mcerror = NULL;
+
+    rc = sftpfs_rmdir (vpath, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for lseek VFS-function.
+ *
+ * @param data   file data handler
+ * @param offset file offset
+ * @param whence method of seek (at begin, at current, at end)
+ * @return 0 if success, negative value otherwise
+ */
+
+static off_t
+sftpfs_cb_lseek (void *data, off_t offset, int whence)
+{
+    off_t ret_offset;
+    vfs_file_handler_t *fh = VFS_FILE_HANDLER (data);
+    GError *mcerror = NULL;
+
+    ret_offset = sftpfs_lseek (fh, offset, whence, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return ret_offset;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for unlink VFS-function.
+ *
+ * @param vpath path to file or directory
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_unlink (const vfs_path_t * vpath)
+{
+    int rc;
+    GError *mcerror = NULL;
+
+    rc = sftpfs_unlink (vpath, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for rename VFS-function.
+ *
+ * @param vpath1 path to source file or directory
+ * @param vpath2 path to destination file or directory
+ * @return 0 if success, negative value otherwise
+ */
+
+static int
+sftpfs_cb_rename (const vfs_path_t * vpath1, const vfs_path_t * vpath2)
+{
+    int rc;
+    GError *mcerror = NULL;
+
+    rc = sftpfs_rename (vpath1, vpath2, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return rc;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for errno VFS-function.
+ *
+ * @param me unused
+ * @return value of errno global variable
+ */
+
+static int
+sftpfs_cb_errno (struct vfs_class *me)
+{
+    (void) me;
+
+    return errno;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for fill_names VFS function.
+ * Add SFTP connections to the 'Active VFS connections'  list
+ *
+ * @param me   unused
+ * @param func callback function for adding SFTP-connection to list of active connections
+ */
+
+static void
+sftpfs_cb_fill_names (struct vfs_class *me, fill_names_f func)
+{
+    GList *iter;
+
+    (void) me;
+
+    for (iter = sftpfs_subclass.supers; iter != NULL; iter = g_list_next (iter))
+    {
+        const struct vfs_s_super *super = (const struct vfs_s_super *) iter->data;
+        char *name;
+
+        name = vfs_path_element_build_pretty_path_str (super->path_element);
+
+        func (name);
+        g_free (name);
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for checking if connection is equal to existing connection.
+ *
+ * @param vpath_element path element with connetion data
+ * @param super         data with exists connection
+ * @param vpath         unused
+ * @param cookie        unused
+ * @return TRUE if connections is equal, FALSE otherwise
+ */
+
+static gboolean
+sftpfs_archive_same (const vfs_path_element_t * vpath_element, struct vfs_s_super *super,
+                     const vfs_path_t * vpath, void *cookie)
+{
+    int result;
+    vfs_path_element_t *orig_connect_info;
+
+    (void) vpath;
+    (void) cookie;
+
+    orig_connect_info = SFTP_SUPER (super)->original_connection_info;
+
+    result = ((g_strcmp0 (vpath_element->host, orig_connect_info->host) == 0)
+              && (g_strcmp0 (vpath_element->user, orig_connect_info->user) == 0)
+              && (vpath_element->port == orig_connect_info->port));
+
+    return result;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static struct vfs_s_super *
+sftpfs_new_archive (struct vfs_class *me)
+{
+    sftpfs_super_t *arch;
+
+    arch = g_new0 (sftpfs_super_t, 1);
+    arch->base.me = me;
+    arch->base.name = g_strdup (PATH_SEP_STR);
+    arch->auth_type = NONE;
+    arch->config_auth_type = NONE;
+    arch->socket_handle = LIBSSH2_INVALID_SOCKET;
+
+    return VFS_SUPER (arch);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for opening new connection.
+ *
+ * @param super         connection data
+ * @param vpath         unused
+ * @param vpath_element path element with connetion data
+ * @return 0 if success, -1 otherwise
+ */
+
+static int
+sftpfs_open_archive (struct vfs_s_super *super, const vfs_path_t * vpath,
+                     const vfs_path_element_t * vpath_element)
+{
+    GError *mcerror = NULL;
+    sftpfs_super_t *sftpfs_super = SFTP_SUPER (super);
+    int ret_value;
+
+    (void) vpath;
+
+    if (vpath_element->host == NULL || *vpath_element->host == '\0')
+    {
+        vfs_print_message ("%s", _("sftp: Invalid host name."));
+        vpath_element->class->verrno = EPERM;
+        return -1;
+    }
+
+    sftpfs_super->original_connection_info = vfs_path_element_clone (vpath_element);
+    super->path_element = vfs_path_element_clone (vpath_element);
+
+    sftpfs_fill_connection_data_from_config (super, &mcerror);
+    if (mc_error_message (&mcerror, &ret_value))
+    {
+        vpath_element->class->verrno = ret_value;
+        return -1;
+    }
+
+    super->root =
+        vfs_s_new_inode (vpath_element->class, super,
+                         vfs_s_default_stat (vpath_element->class, S_IFDIR | 0755));
+
+    ret_value = sftpfs_open_connection (super, &mcerror);
+    mc_error_message (&mcerror, NULL);
+    return ret_value;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for closing connection.
+ *
+ * @param me    unused
+ * @param super connection data
+ */
+
+static void
+sftpfs_free_archive (struct vfs_class *me, struct vfs_s_super *super)
+{
+    GError *mcerror = NULL;
+
+    (void) me;
+
+    sftpfs_close_connection (super, "Normal Shutdown", &mcerror);
+
+    vfs_path_element_free (SFTP_SUPER (super)->original_connection_info);
+
+    mc_error_message (&mcerror, NULL);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Callback for getting directory content.
+ *
+ * @param me          unused
+ * @param dir         unused
+ * @param remote_path unused
+ * @return always 0
+ */
+
+static int
+sftpfs_cb_dir_load (struct vfs_class *me, struct vfs_s_inode *dir, const char *remote_path)
+{
+    (void) me;
+    (void) dir;
+    (void) remote_path;
+
+    return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Initialization of SFTP Virtual File Sysytem.
+ */
+
+void
+vfs_init_sftpfs (void)
+{
+    tcp_init ();
+
+    vfs_init_subclass (&sftpfs_subclass, "sftpfs", VFSF_NOLINKS | VFSF_REMOTE, "sftp");
+
+    vfs_sftpfs_ops->init = sftpfs_cb_init;
+    vfs_sftpfs_ops->done = sftpfs_cb_done;
+
+    vfs_sftpfs_ops->fill_names = sftpfs_cb_fill_names;
+
+    vfs_sftpfs_ops->opendir = sftpfs_cb_opendir;
+    vfs_sftpfs_ops->readdir = sftpfs_cb_readdir;
+    vfs_sftpfs_ops->closedir = sftpfs_cb_closedir;
+    vfs_sftpfs_ops->mkdir = sftpfs_cb_mkdir;
+    vfs_sftpfs_ops->rmdir = sftpfs_cb_rmdir;
+
+    vfs_sftpfs_ops->stat = sftpfs_cb_stat;
+    vfs_sftpfs_ops->lstat = sftpfs_cb_lstat;
+    vfs_sftpfs_ops->fstat = sftpfs_cb_fstat;
+    vfs_sftpfs_ops->readlink = sftpfs_cb_readlink;
+    vfs_sftpfs_ops->symlink = sftpfs_cb_symlink;
+    vfs_sftpfs_ops->link = sftpfs_cb_link;
+    vfs_sftpfs_ops->utime = sftpfs_cb_utime;
+    vfs_sftpfs_ops->mknod = sftpfs_cb_mknod;
+    vfs_sftpfs_ops->chown = sftpfs_cb_chown;
+    vfs_sftpfs_ops->chmod = sftpfs_cb_chmod;
+
+    vfs_sftpfs_ops->open = sftpfs_cb_open;
+    vfs_sftpfs_ops->read = sftpfs_cb_read;
+    vfs_sftpfs_ops->write = sftpfs_cb_write;
+    vfs_sftpfs_ops->close = sftpfs_cb_close;
+    vfs_sftpfs_ops->lseek = sftpfs_cb_lseek;
+    vfs_sftpfs_ops->unlink = sftpfs_cb_unlink;
+    vfs_sftpfs_ops->rename = sftpfs_cb_rename;
+    vfs_sftpfs_ops->ferrno = sftpfs_cb_errno;
+
+    sftpfs_subclass.archive_same = sftpfs_archive_same;
+    sftpfs_subclass.new_archive = sftpfs_new_archive;
+    sftpfs_subclass.open_archive = sftpfs_open_archive;
+    sftpfs_subclass.free_archive = sftpfs_free_archive;
+    sftpfs_subclass.fh_new = sftpfs_fh_new;
+    sftpfs_subclass.dir_load = sftpfs_cb_dir_load;
+
+    vfs_register_class (vfs_sftpfs_ops);
+}
+
+/* --------------------------------------------------------------------------------------------- */
diff --git a/src/vfs/sftpfs/sftpfs.h b/src/vfs/sftpfs/sftpfs.h
new file mode 100644
index 0000000..d3a1935
--- /dev/null
+++ b/src/vfs/sftpfs/sftpfs.h
@@ -0,0 +1,23 @@
+/**
+ * \file
+ * \brief Header: SFTP FS
+ */
+
+#ifndef MC__VFS_SFTPFS_H
+#define MC__VFS_SFTPFS_H
+
+/*** typedefs(not structures) and defined constants **********************************************/
+
+/*** enums ***************************************************************************************/
+
+/*** structures declarations (and typedefs of structures)*****************************************/
+
+/*** global variables defined in .c file *********************************************************/
+
+/*** declarations of public functions ************************************************************/
+
+void vfs_init_sftpfs (void);
+
+/*** inline functions ****************************************************************************/
+
+#endif /* MC__VFS_SFTPFS_H */