lbbs/src/test_ssh_server.c

/***************************************************************************
                                        test_ssh_server.c  -  description
                                                         -------------------
        Copyright            : (C) 2004-2025 by Leaflet
        Email                : leaflet@leafok.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program 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.                                   *
 *                                                                         *
 ***************************************************************************/

// This test was written based on libssh example/proxy.c

#include "log.h"
#include <stdio.h>
#include <libssh/callbacks.h>
#include <libssh/libssh.h>
#include <libssh/server.h>

#ifndef BUF_SIZE
#define BUF_SIZE 2048
#endif

#define SSH_HOST_RSA_KEYFILE "../conf/ssh_host_rsa_key"

#define USER "test"
#define PASSWORD "123456"

static ssh_channel SSH_channel;
static int authenticated = 0;
static int tries = 0;
static int error = 0;

static int auth_password(ssh_session session, const char *user,
                                                 const char *password, void *userdata)
{
        (void)userdata;

        log_common("Authenticating user %s pwd %s\n", user, password);
        if (strcmp(user, USER) == 0 && strcmp(password, PASSWORD) == 0)
        {
                authenticated = 1;
                log_common("Authenticated\n");
                return SSH_AUTH_SUCCESS;
        }
        if (tries >= 3)
        {
                log_error("Too many authentication tries\n");
                ssh_disconnect(session);
                error = 1;
                return SSH_AUTH_DENIED;
        }
        tries++;
        return SSH_AUTH_DENIED;
}

static int pty_request(ssh_session session, ssh_channel channel, const char *term,
                                           int x, int y, int px, int py, void *userdata)
{
        (void)session;
        (void)channel;
        (void)term;
        (void)x;
        (void)y;
        (void)px;
        (void)py;
        (void)userdata;
        log_common("Allocated terminal\n");
        return 0;
}

static int shell_request(ssh_session session, ssh_channel channel, void *userdata)
{
        (void)session;
        (void)channel;
        (void)userdata;
        log_common("Allocated shell\n");
        return 0;
}

struct ssh_channel_callbacks_struct channel_cb = {
        .channel_pty_request_function = pty_request,
        .channel_shell_request_function = shell_request};

static ssh_channel new_session_channel(ssh_session session, void *userdata)
{
        (void)session;
        (void)userdata;

        if (SSH_channel != NULL)
                return NULL;

        log_common("Allocated session channel\n");
        SSH_channel = ssh_channel_new(session);
        ssh_callbacks_init(&channel_cb);
        ssh_set_channel_callbacks(SSH_channel, &channel_cb);

        return SSH_channel;
}

int ssh_server(const char *hostaddr, unsigned int port)
{
        ssh_bind sshbind;
        ssh_session session;
        ssh_event event;

        struct ssh_server_callbacks_struct cb = {
                .userdata = NULL,
                .auth_password_function = auth_password,
                .channel_open_request_session_function = new_session_channel};

        char buf[BUF_SIZE];
        char host[128] = "";
        int i, r;

        int ssh_log_level = SSH_LOG_PROTOCOL;

        ssh_init();

        sshbind = ssh_bind_new();

        if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_RSA_KEYFILE) < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS, "ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256") < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_PUBKEY_ACCEPTED_KEY_TYPES, "ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256") < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_KEY_EXCHANGE, "curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1") < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HMAC_C_S, "umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1") < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HMAC_S_C, "umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1") < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_CIPHERS_C_S, "chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com") < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_CIPHERS_S_C, "chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com") < 0 ||
                ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
        {
                log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
                ssh_bind_free(sshbind);
                return -1;
        }

        if (ssh_bind_listen(sshbind) < 0)
        {
                log_error("Error listening at SSH server port: %s\n", ssh_get_error(sshbind));
                ssh_bind_free(sshbind);
                return -1;
        }

        while (1)
        {
                session = ssh_new();

                if (ssh_bind_accept(sshbind, session) == SSH_OK)
                {
                        pid_t pid = fork();
                        switch (pid)
                        {
                        case 0:
                                ssh_bind_free(sshbind);

                                ssh_callbacks_init(&cb);
                                ssh_set_server_callbacks(session, &cb);

                                if (ssh_handle_key_exchange(session))
                                {
                                        log_error("ssh_handle_key_exchange: %s\n", ssh_get_error(session));
                                        return 1;
                                }
                                ssh_set_auth_methods(session, SSH_AUTH_METHOD_PASSWORD | SSH_AUTH_METHOD_GSSAPI_MIC);

                                event = ssh_event_new();
                                ssh_event_add_session(event, session);

                                while (!(authenticated && SSH_channel != NULL))
                                {
                                        if (error)
                                                break;
                                        r = ssh_event_dopoll(event, -1);
                                        if (r == SSH_ERROR)
                                        {
                                                log_error("Error : %s\n", ssh_get_error(session));
                                                ssh_disconnect(session);
                                                _exit(1);
                                        }
                                }

                                if (error)
                                {
                                        log_error("Error, exiting loop\n");
                                        _exit(1);
                                }
                                else
                                {
                                        log_common("Authenticated and got a channel\n");
                                }

                                snprintf(buf, sizeof(buf), "Hello, welcome to the Sample SSH proxy.\r\nPlease select your destination: ");
                                ssh_channel_write(SSH_channel, buf, (uint32_t)strlen(buf));
                                do
                                {
                                        i = ssh_channel_read(SSH_channel, buf, sizeof(buf), 0);
                                        if (i > 0)
                                        {
                                                ssh_channel_write(SSH_channel, buf, (uint32_t)i);
                                                if (strlen(host) + (size_t)i < sizeof(host))
                                                {
                                                        strncat(host, buf, (size_t)i);
                                                }
                                                if (strchr(host, '\x0d'))
                                                {
                                                        *strchr(host, '\x0d') = '\0';
                                                        ssh_channel_write(SSH_channel, "\n", 1);
                                                        break;
                                                }
                                        }
                                        else
                                        {
                                                log_error("Error: %s\n", ssh_get_error(session));
                                                _exit(1);
                                        }
                                } while (i > 0);
                                snprintf(buf, sizeof(buf), "Trying to connect to \"%s\"\r\n", host);
                                ssh_channel_write(SSH_channel, buf, (uint32_t)strlen(buf));
                                log_common("%s", buf);

                                ssh_disconnect(session);
                                ssh_free(session);

                                _exit(0);
                        case -1:
                                log_error("Failed to fork\n");
                                break;
                        }
                }
                else
                {
                        log_error("%s\n", ssh_get_error(sshbind));
                }

                /* Since the session has been passed to a child fork, do some cleaning
                 * up at the parent process. */
                ssh_disconnect(session);
                ssh_free(session);
        }

        ssh_bind_free(sshbind);
        ssh_finalize();

        return 0;
}

int main(int argc, char *argv[])
{
        if (log_begin("../log/bbsd.log", "../log/error.log") < 0)
        {
                printf("Open log error\n");
                return -1;
        }

        log_common_redir(STDOUT_FILENO);
        log_error_redir(STDERR_FILENO);

        ssh_server("0.0.0.0", 2322);

        log_end();

        return 0;
}
1	sysadm	1.8	/***************************************************************************
2			test_ssh_server.c - description
3			-------------------
4			Copyright : (C) 2004-2025 by Leaflet
5			Email : leaflet@leafok.com
6			***************************************************************************/
7
8			/***************************************************************************
9			* *
10			* This program is free software; you can redistribute it and/or modify *
11			* it under the terms of the GNU General Public License as published by *
12			* the Free Software Foundation; either version 3 of the License, or *
13			* (at your option) any later version. *
14			* *
15			***************************************************************************/
16
17			// This test was written based on libssh example/proxy.c
18	sysadm	1.7
19	sysadm	1.1	#include "log.h"
20			#include <stdio.h>
21	sysadm	1.9	#include <libssh/callbacks.h>
22	sysadm	1.1	#include <libssh/libssh.h>
23			#include <libssh/server.h>
24
25	sysadm	1.2	#ifndef BUF_SIZE
26			#define BUF_SIZE 2048
27			#endif
28
29	sysadm	1.6	#define SSH_HOST_RSA_KEYFILE "../conf/ssh_host_rsa_key"
30	sysadm	1.2
31			#define USER "test"
32			#define PASSWORD "123456"
33
34	sysadm	1.4	static ssh_channel SSH_channel;
35	sysadm	1.2	static int authenticated = 0;
36			static int tries = 0;
37			static int error = 0;
38
39			static int auth_password(ssh_session session, const char *user,
40			const char password, void userdata)
41	sysadm	1.1	{
42	sysadm	1.2	(void)userdata;
43
44	sysadm	1.3	log_common("Authenticating user %s pwd %s\n", user, password);
45	sysadm	1.2	if (strcmp(user, USER) == 0 && strcmp(password, PASSWORD) == 0)
46	sysadm	1.1	{
47	sysadm	1.2	authenticated = 1;
48	sysadm	1.3	log_common("Authenticated\n");
49	sysadm	1.1	return SSH_AUTH_SUCCESS;
50			}
51	sysadm	1.2	if (tries >= 3)
52			{
53			log_error("Too many authentication tries\n");
54			ssh_disconnect(session);
55			error = 1;
56			return SSH_AUTH_DENIED;
57			}
58			tries++;
59			return SSH_AUTH_DENIED;
60			}
61
62			static int pty_request(ssh_session session, ssh_channel channel, const char *term,
63			int x, int y, int px, int py, void *userdata)
64			{
65			(void)session;
66			(void)channel;
67			(void)term;
68			(void)x;
69			(void)y;
70			(void)px;
71			(void)py;
72			(void)userdata;
73	sysadm	1.3	log_common("Allocated terminal\n");
74	sysadm	1.2	return 0;
75			}
76
77			static int shell_request(ssh_session session, ssh_channel channel, void *userdata)
78			{
79			(void)session;
80			(void)channel;
81			(void)userdata;
82	sysadm	1.3	log_common("Allocated shell\n");
83	sysadm	1.2	return 0;
84			}
85	sysadm	1.4
86	sysadm	1.2	struct ssh_channel_callbacks_struct channel_cb = {
87			.channel_pty_request_function = pty_request,
88			.channel_shell_request_function = shell_request};
89
90			static ssh_channel new_session_channel(ssh_session session, void *userdata)
91			{
92			(void)session;
93			(void)userdata;
94	sysadm	1.1
95	sysadm	1.4	if (SSH_channel != NULL)
96	sysadm	1.2	return NULL;
97
98	sysadm	1.3	log_common("Allocated session channel\n");
99	sysadm	1.4	SSH_channel = ssh_channel_new(session);
100	sysadm	1.2	ssh_callbacks_init(&channel_cb);
101	sysadm	1.4	ssh_set_channel_callbacks(SSH_channel, &channel_cb);
102	sysadm	1.2
103	sysadm	1.4	return SSH_channel;
104	sysadm	1.1	}
105
106			int ssh_server(const char *hostaddr, unsigned int port)
107			{
108	sysadm	1.4	ssh_bind sshbind;
109	sysadm	1.2	ssh_session session;
110			ssh_event event;
111
112	sysadm	1.1	struct ssh_server_callbacks_struct cb = {
113			.userdata = NULL,
114	sysadm	1.2	.auth_password_function = auth_password,
115			.channel_open_request_session_function = new_session_channel};
116
117			char buf[BUF_SIZE];
118			char host[128] = "";
119			int i, r;
120
121	sysadm	1.6	int ssh_log_level = SSH_LOG_PROTOCOL;
122	sysadm	1.1
123			ssh_init();
124
125			sshbind = ssh_bind_new();
126
127			if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 \|\|
128			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 \|\|
129	sysadm	1.6	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_RSA_KEYFILE) < 0 \|\|
130	sysadm	1.5	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS, "ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256") < 0 \|\|
131	sysadm	1.6	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_PUBKEY_ACCEPTED_KEY_TYPES, "ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256") < 0 \|\|
132	sysadm	1.5	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_KEY_EXCHANGE, "curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1") < 0 \|\|
133			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HMAC_C_S, "umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1") < 0 \|\|
134			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HMAC_S_C, "umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1") < 0 \|\|
135			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_CIPHERS_C_S, "chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com") < 0 \|\|
136			ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_CIPHERS_S_C, "chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com") < 0 \|\|
137	sysadm	1.1	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
138			{
139			log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
140	sysadm	1.2	ssh_bind_free(sshbind);
141	sysadm	1.1	return -1;
142			}
143
144			if (ssh_bind_listen(sshbind) < 0)
145			{
146			log_error("Error listening at SSH server port: %s\n", ssh_get_error(sshbind));
147	sysadm	1.2	ssh_bind_free(sshbind);
148	sysadm	1.1	return -1;
149			}
150
151			while (1)
152			{
153			session = ssh_new();
154
155	sysadm	1.2	if (ssh_bind_accept(sshbind, session) == SSH_OK)
156	sysadm	1.1	{
157	sysadm	1.2	pid_t pid = fork();
158			switch (pid)
159			{
160			case 0:
161			ssh_bind_free(sshbind);
162
163			ssh_callbacks_init(&cb);
164			ssh_set_server_callbacks(session, &cb);
165
166			if (ssh_handle_key_exchange(session))
167			{
168			log_error("ssh_handle_key_exchange: %s\n", ssh_get_error(session));
169			return 1;
170			}
171			ssh_set_auth_methods(session, SSH_AUTH_METHOD_PASSWORD \| SSH_AUTH_METHOD_GSSAPI_MIC);
172
173			event = ssh_event_new();
174			ssh_event_add_session(event, session);
175
176	sysadm	1.4	while (!(authenticated && SSH_channel != NULL))
177	sysadm	1.2	{
178			if (error)
179			break;
180			r = ssh_event_dopoll(event, -1);
181			if (r == SSH_ERROR)
182			{
183			log_error("Error : %s\n", ssh_get_error(session));
184			ssh_disconnect(session);
185			_exit(1);
186			}
187			}
188
189			if (error)
190			{
191			log_error("Error, exiting loop\n");
192			_exit(1);
193			}
194			else
195			{
196	sysadm	1.3	log_common("Authenticated and got a channel\n");
197	sysadm	1.2	}
198
199			snprintf(buf, sizeof(buf), "Hello, welcome to the Sample SSH proxy.\r\nPlease select your destination: ");
200	sysadm	1.4	ssh_channel_write(SSH_channel, buf, (uint32_t)strlen(buf));
201	sysadm	1.2	do
202			{
203	sysadm	1.4	i = ssh_channel_read(SSH_channel, buf, sizeof(buf), 0);
204	sysadm	1.2	if (i > 0)
205			{
206	sysadm	1.4	ssh_channel_write(SSH_channel, buf, (uint32_t)i);
207	sysadm	1.2	if (strlen(host) + (size_t)i < sizeof(host))
208			{
209			strncat(host, buf, (size_t)i);
210			}
211			if (strchr(host, '\x0d'))
212			{
213			*strchr(host, '\x0d') = '\0';
214	sysadm	1.4	ssh_channel_write(SSH_channel, "\n", 1);
215	sysadm	1.2	break;
216			}
217			}
218			else
219			{
220			log_error("Error: %s\n", ssh_get_error(session));
221			_exit(1);
222			}
223			} while (i > 0);
224			snprintf(buf, sizeof(buf), "Trying to connect to \"%s\"\r\n", host);
225	sysadm	1.4	ssh_channel_write(SSH_channel, buf, (uint32_t)strlen(buf));
226	sysadm	1.3	log_common("%s", buf);
227	sysadm	1.2
228			ssh_disconnect(session);
229			ssh_free(session);
230
231			_exit(0);
232			case -1:
233			log_error("Failed to fork\n");
234			break;
235			}
236	sysadm	1.1	}
237	sysadm	1.2	else
238	sysadm	1.1	{
239	sysadm	1.2	log_error("%s\n", ssh_get_error(sshbind));
240	sysadm	1.1	}
241
242	sysadm	1.2	/* Since the session has been passed to a child fork, do some cleaning
243			* up at the parent process. */
244	sysadm	1.1	ssh_disconnect(session);
245			ssh_free(session);
246			}
247
248			ssh_bind_free(sshbind);
249			ssh_finalize();
250
251			return 0;
252			}
253
254			int main(int argc, char *argv[])
255			{
256			if (log_begin("../log/bbsd.log", "../log/error.log") < 0)
257			{
258			printf("Open log error\n");
259			return -1;
260			}
261
262	sysadm	1.3	log_common_redir(STDOUT_FILENO);
263			log_error_redir(STDERR_FILENO);
264	sysadm	1.1
265			ssh_server("0.0.0.0", 2322);
266
267			log_end();
268
269			return 0;
270			}
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