lbbs/src/test_ssh_server.c

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

#ifndef BUF_SIZE
#define BUF_SIZE 2048
#endif

#define SSH_HOST_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_FUNCTIONS;

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