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mc/src/vfs/sftpfs/connection.c
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| /* Virtual File System: SFTP file system. | |
| The internal functions: connections | |
| Copyright (C) 2011-2023 | |
| 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 ****************************************************************/ | |
| /*** forward declarations (file scope functions) *************************************************/ | |
| /*** 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 0x%x", _("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; | |
| } | |
| } | |
| /* --------------------------------------------------------------------------------------------- */ |