309 lines
8.8 KiB
C
309 lines
8.8 KiB
C
|
/* Copyright (C) The libssh2 project and its contributors.
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "libssh2_setup.h"
|
||
|
|
#include <libssh2.h>
|
||
|
|
|
||
|
|
#ifdef HAVE_SYS_SOCKET_H
|
||
|
|
#include <sys/socket.h>
|
||
|
|
#endif
|
||
|
|
#ifdef HAVE_UNISTD_H
|
||
|
|
#include <unistd.h>
|
||
|
|
#endif
|
||
|
|
#ifdef HAVE_NETINET_IN_H
|
||
|
|
#include <netinet/in.h>
|
||
|
|
#endif
|
||
|
|
#ifdef HAVE_ARPA_INET_H
|
||
|
|
#include <arpa/inet.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#ifndef INADDR_NONE
|
||
|
|
#define INADDR_NONE (in_addr_t)~0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static const char *pubkey = "/home/username/.ssh/id_rsa.pub";
|
||
|
|
static const char *privkey = "/home/username/.ssh/id_rsa";
|
||
|
|
static const char *username = "username";
|
||
|
|
static const char *password = "";
|
||
|
|
|
||
|
|
static const char *server_ip = "127.0.0.1";
|
||
|
|
|
||
|
|
enum {
|
||
|
|
AUTH_NONE = 0,
|
||
|
|
AUTH_PASSWORD = 1,
|
||
|
|
AUTH_PUBLICKEY = 2
|
||
|
|
};
|
||
|
|
|
||
|
|
static int netconf_write(LIBSSH2_CHANNEL *channel, const char *buf, size_t len)
|
||
|
|
{
|
||
|
|
ssize_t i;
|
||
|
|
ssize_t wr = 0;
|
||
|
|
|
||
|
|
do {
|
||
|
|
i = libssh2_channel_write(channel, buf, len);
|
||
|
|
if(i < 0) {
|
||
|
|
fprintf(stderr, "libssh2_channel_write: %ld\n", (long)i);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
wr += i;
|
||
|
|
} while(i > 0 && wr < (ssize_t)len);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static ssize_t netconf_read_until(LIBSSH2_CHANNEL *channel, const char *endtag,
|
||
|
|
char *buf, size_t buflen)
|
||
|
|
{
|
||
|
|
ssize_t len;
|
||
|
|
size_t rd = 0;
|
||
|
|
char *endreply = NULL, *specialsequence = NULL;
|
||
|
|
|
||
|
|
memset(buf, 0, buflen);
|
||
|
|
|
||
|
|
do {
|
||
|
|
len = libssh2_channel_read(channel, buf + rd, buflen - rd);
|
||
|
|
if(LIBSSH2_ERROR_EAGAIN == len)
|
||
|
|
continue;
|
||
|
|
else if(len < 0) {
|
||
|
|
fprintf(stderr, "libssh2_channel_read: %ld\n", (long)len);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
rd += (size_t)len;
|
||
|
|
|
||
|
|
/* read more data until we see a rpc-reply closing tag followed by
|
||
|
|
* the special sequence ]]>]]> */
|
||
|
|
|
||
|
|
/* really, this MUST be replaced with proper XML parsing. */
|
||
|
|
|
||
|
|
endreply = strstr(buf, endtag);
|
||
|
|
if(endreply)
|
||
|
|
specialsequence = strstr(endreply, "]]>]]>");
|
||
|
|
|
||
|
|
} while(!specialsequence && rd < buflen);
|
||
|
|
|
||
|
|
if(!specialsequence) {
|
||
|
|
fprintf(stderr, "netconf_read_until(): ]]>]]> not found."
|
||
|
|
" Read buffer too small?\n");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* discard the special sequence so that only XML is returned */
|
||
|
|
rd = (size_t)(specialsequence - buf);
|
||
|
|
buf[rd] = 0;
|
||
|
|
|
||
|
|
return (ssize_t)rd;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
int i, auth = AUTH_NONE;
|
||
|
|
struct sockaddr_in sin;
|
||
|
|
const char *fingerprint;
|
||
|
|
char *userauthlist;
|
||
|
|
int rc;
|
||
|
|
LIBSSH2_SESSION *session = NULL;
|
||
|
|
LIBSSH2_CHANNEL *channel = NULL;
|
||
|
|
char buf[1048576]; /* avoid any buffer reallocation for simplicity */
|
||
|
|
ssize_t len;
|
||
|
|
libssh2_socket_t sock;
|
||
|
|
|
||
|
|
#ifdef _WIN32
|
||
|
|
WSADATA wsadata;
|
||
|
|
|
||
|
|
rc = WSAStartup(MAKEWORD(2, 0), &wsadata);
|
||
|
|
if(rc) {
|
||
|
|
fprintf(stderr, "WSAStartup failed with error: %d\n", rc);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
if(argc > 1)
|
||
|
|
server_ip = argv[1];
|
||
|
|
if(argc > 2)
|
||
|
|
username = argv[2];
|
||
|
|
if(argc > 3)
|
||
|
|
password = argv[3];
|
||
|
|
|
||
|
|
rc = libssh2_init(0);
|
||
|
|
if(rc) {
|
||
|
|
fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Connect to SSH server */
|
||
|
|
sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
|
||
|
|
if(sock == LIBSSH2_INVALID_SOCKET) {
|
||
|
|
fprintf(stderr, "failed to open socket.\n");
|
||
|
|
goto shutdown;
|
||
|
|
}
|
||
|
|
|
||
|
|
sin.sin_family = AF_INET;
|
||
|
|
sin.sin_addr.s_addr = inet_addr(server_ip);
|
||
|
|
if(INADDR_NONE == sin.sin_addr.s_addr) {
|
||
|
|
fprintf(stderr, "inet_addr: Invalid IP address '%s'\n", server_ip);
|
||
|
|
goto shutdown;
|
||
|
|
}
|
||
|
|
sin.sin_port = htons(830);
|
||
|
|
if(connect(sock, (struct sockaddr*)(&sin), sizeof(struct sockaddr_in))) {
|
||
|
|
fprintf(stderr, "Failed to connect to %s.\n", inet_ntoa(sin.sin_addr));
|
||
|
|
goto shutdown;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Create a session instance */
|
||
|
|
session = libssh2_session_init();
|
||
|
|
if(!session) {
|
||
|
|
fprintf(stderr, "Could not initialize SSH session.\n");
|
||
|
|
goto shutdown;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* ... start it up. This will trade welcome banners, exchange keys,
|
||
|
|
* and setup crypto, compression, and MAC layers
|
||
|
|
*/
|
||
|
|
rc = libssh2_session_handshake(session, sock);
|
||
|
|
if(rc) {
|
||
|
|
fprintf(stderr, "Error when starting up SSH session: %d\n", rc);
|
||
|
|
goto shutdown;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* At this point we have not yet authenticated. The first thing to do
|
||
|
|
* is check the hostkey's fingerprint against our known hosts Your app
|
||
|
|
* may have it hard coded, may go to a file, may present it to the
|
||
|
|
* user, that's your call
|
||
|
|
*/
|
||
|
|
fingerprint = libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_SHA1);
|
||
|
|
fprintf(stderr, "Fingerprint: ");
|
||
|
|
for(i = 0; i < 20; i++)
|
||
|
|
fprintf(stderr, "%02X ", (unsigned char)fingerprint[i]);
|
||
|
|
fprintf(stderr, "\n");
|
||
|
|
|
||
|
|
/* check what authentication methods are available */
|
||
|
|
userauthlist = libssh2_userauth_list(session, username,
|
||
|
|
(unsigned int)strlen(username));
|
||
|
|
if(userauthlist) {
|
||
|
|
fprintf(stderr, "Authentication methods: %s\n", userauthlist);
|
||
|
|
if(strstr(userauthlist, "password"))
|
||
|
|
auth |= AUTH_PASSWORD;
|
||
|
|
if(strstr(userauthlist, "publickey"))
|
||
|
|
auth |= AUTH_PUBLICKEY;
|
||
|
|
|
||
|
|
/* check for options */
|
||
|
|
if(argc > 4) {
|
||
|
|
if((auth & AUTH_PASSWORD) && !strcmp(argv[4], "-p"))
|
||
|
|
auth = AUTH_PASSWORD;
|
||
|
|
if((auth & AUTH_PUBLICKEY) && !strcmp(argv[4], "-k"))
|
||
|
|
auth = AUTH_PUBLICKEY;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(auth & AUTH_PASSWORD) {
|
||
|
|
if(libssh2_userauth_password(session, username, password)) {
|
||
|
|
fprintf(stderr, "Authentication by password failed.\n");
|
||
|
|
goto shutdown;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else if(auth & AUTH_PUBLICKEY) {
|
||
|
|
if(libssh2_userauth_publickey_fromfile(session, username,
|
||
|
|
pubkey, privkey,
|
||
|
|
password)) {
|
||
|
|
fprintf(stderr, "Authentication by public key failed.\n");
|
||
|
|
goto shutdown;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
fprintf(stderr, "Authentication by public key succeeded.\n");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
fprintf(stderr, "No supported authentication methods found.\n");
|
||
|
|
goto shutdown;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* open a channel */
|
||
|
|
channel = libssh2_channel_open_session(session);
|
||
|
|
if(!channel) {
|
||
|
|
fprintf(stderr, "Could not open the channel.\n"
|
||
|
|
"(Note that this can be a problem at the server."
|
||
|
|
" Please review the server logs.)\n");
|
||
|
|
goto shutdown;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* execute the subsystem on our channel */
|
||
|
|
if(libssh2_channel_subsystem(channel, "netconf")) {
|
||
|
|
fprintf(stderr, "Could not execute the 'netconf' subsystem.\n"
|
||
|
|
"(Note that this can be a problem at the server."
|
||
|
|
" Please review the server logs.)\n");
|
||
|
|
goto shutdown;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* NETCONF: https://tools.ietf.org/html/draft-ietf-netconf-ssh-06 */
|
||
|
|
|
||
|
|
fprintf(stderr, "Sending NETCONF client <hello>\n");
|
||
|
|
len = snprintf(buf, sizeof(buf),
|
||
|
|
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
|
||
|
|
"<hello>"
|
||
|
|
"<capabilities>"
|
||
|
|
"<capability>urn:ietf:params:xml:ns:netconf:base:1.0</capability>"
|
||
|
|
"</capabilities>"
|
||
|
|
"</hello>\n"
|
||
|
|
"]]>]]>\n");
|
||
|
|
if(len < 0)
|
||
|
|
goto shutdown;
|
||
|
|
if(-1 == netconf_write(channel, buf, (size_t)len))
|
||
|
|
goto shutdown;
|
||
|
|
|
||
|
|
fprintf(stderr, "Reading NETCONF server <hello>\n");
|
||
|
|
len = netconf_read_until(channel, "</hello>", buf, sizeof(buf));
|
||
|
|
if(-1 == len)
|
||
|
|
goto shutdown;
|
||
|
|
|
||
|
|
fprintf(stderr, "Got %ld bytes:\n----------------------\n%s",
|
||
|
|
(long)len, buf);
|
||
|
|
|
||
|
|
fprintf(stderr, "Sending NETCONF <rpc>\n");
|
||
|
|
len = snprintf(buf, sizeof(buf),
|
||
|
|
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
|
||
|
|
"<rpc xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\">"
|
||
|
|
"<get-interface-information><terse/></get-interface-information>"
|
||
|
|
"</rpc>\n"
|
||
|
|
"]]>]]>\n");
|
||
|
|
if(len < 0)
|
||
|
|
goto shutdown;
|
||
|
|
if(-1 == netconf_write(channel, buf, (size_t)len))
|
||
|
|
goto shutdown;
|
||
|
|
|
||
|
|
fprintf(stderr, "Reading NETCONF <rpc-reply>\n");
|
||
|
|
len = netconf_read_until(channel, "</rpc-reply>", buf, sizeof(buf));
|
||
|
|
if(-1 == len)
|
||
|
|
goto shutdown;
|
||
|
|
|
||
|
|
fprintf(stderr, "Got %ld bytes:\n----------------------\n%s",
|
||
|
|
(long)len, buf);
|
||
|
|
|
||
|
|
shutdown:
|
||
|
|
|
||
|
|
if(channel)
|
||
|
|
libssh2_channel_free(channel);
|
||
|
|
|
||
|
|
if(session) {
|
||
|
|
libssh2_session_disconnect(session, "Normal Shutdown");
|
||
|
|
libssh2_session_free(session);
|
||
|
|
}
|
||
|
|
|
||
|
|
if(sock != LIBSSH2_INVALID_SOCKET) {
|
||
|
|
shutdown(sock, 2);
|
||
|
|
LIBSSH2_SOCKET_CLOSE(sock);
|
||
|
|
}
|
||
|
|
|
||
|
|
libssh2_exit();
|
||
|
|
|
||
|
|
#ifdef _WIN32
|
||
|
|
WSACleanup();
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|