lbbs/src/test_ssh_server.c

// This test was written base on libssh example/proxy.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_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	// This test was written base on libssh example/proxy.c
2
3	#include "log.h"
4	#include <stdio.h>
5	#include <libssh/libssh.h>
6	#include <libssh/server.h>
7	#include <libssh/callbacks.h>
8
9	#ifndef BUF_SIZE
10	#define BUF_SIZE 2048
11	#endif
12
13	#define SSH_HOST_RSA_KEYFILE "../conf/ssh_host_rsa_key"
14
15	#define USER "test"
16	#define PASSWORD "123456"
17
18	static ssh_channel SSH_channel;
19	static int authenticated = 0;
20	static int tries = 0;
21	static int error = 0;
22
23	static int auth_password(ssh_session session, const char *user,
24	const char password, void userdata)
25	{
26	(void)userdata;
27
28	log_common("Authenticating user %s pwd %s\n", user, password);
29	if (strcmp(user, USER) == 0 && strcmp(password, PASSWORD) == 0)
30	{
31	authenticated = 1;
32	log_common("Authenticated\n");
33	return SSH_AUTH_SUCCESS;
34	}
35	if (tries >= 3)
36	{
37	log_error("Too many authentication tries\n");
38	ssh_disconnect(session);
39	error = 1;
40	return SSH_AUTH_DENIED;
41	}
42	tries++;
43	return SSH_AUTH_DENIED;
44	}
45
46	static int pty_request(ssh_session session, ssh_channel channel, const char *term,
47	int x, int y, int px, int py, void *userdata)
48	{
49	(void)session;
50	(void)channel;
51	(void)term;
52	(void)x;
53	(void)y;
54	(void)px;
55	(void)py;
56	(void)userdata;
57	log_common("Allocated terminal\n");
58	return 0;
59	}
60
61	static int shell_request(ssh_session session, ssh_channel channel, void *userdata)
62	{
63	(void)session;
64	(void)channel;
65	(void)userdata;
66	log_common("Allocated shell\n");
67	return 0;
68	}
69
70	struct ssh_channel_callbacks_struct channel_cb = {
71	.channel_pty_request_function = pty_request,
72	.channel_shell_request_function = shell_request};
73
74	static ssh_channel new_session_channel(ssh_session session, void *userdata)
75	{
76	(void)session;
77	(void)userdata;
78
79	if (SSH_channel != NULL)
80	return NULL;
81
82	log_common("Allocated session channel\n");
83	SSH_channel = ssh_channel_new(session);
84	ssh_callbacks_init(&channel_cb);
85	ssh_set_channel_callbacks(SSH_channel, &channel_cb);
86
87	return SSH_channel;
88	}
89
90	int ssh_server(const char *hostaddr, unsigned int port)
91	{
92	ssh_bind sshbind;
93	ssh_session session;
94	ssh_event event;
95
96	struct ssh_server_callbacks_struct cb = {
97	.userdata = NULL,
98	.auth_password_function = auth_password,
99	.channel_open_request_session_function = new_session_channel};
100
101	char buf[BUF_SIZE];
102	char host[128] = "";
103	int i, r;
104
105	int ssh_log_level = SSH_LOG_PROTOCOL;
106
107	ssh_init();
108
109	sshbind = ssh_bind_new();
110
111	if (ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, hostaddr) < 0 \|\|
112	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &port) < 0 \|\|
113	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, SSH_HOST_RSA_KEYFILE) < 0 \|\|
114	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS, "ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256") < 0 \|\|
115	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_PUBKEY_ACCEPTED_KEY_TYPES, "ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256") < 0 \|\|
116	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 \|\|
117	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 \|\|
118	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 \|\|
119	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 \|\|
120	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 \|\|
121	ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY, &ssh_log_level) < 0)
122	{
123	log_error("Error setting SSH bind options: %s\n", ssh_get_error(sshbind));
124	ssh_bind_free(sshbind);
125	return -1;
126	}
127
128	if (ssh_bind_listen(sshbind) < 0)
129	{
130	log_error("Error listening at SSH server port: %s\n", ssh_get_error(sshbind));
131	ssh_bind_free(sshbind);
132	return -1;
133	}
134
135	while (1)
136	{
137	session = ssh_new();
138
139	if (ssh_bind_accept(sshbind, session) == SSH_OK)
140	{
141	pid_t pid = fork();
142	switch (pid)
143	{
144	case 0:
145	ssh_bind_free(sshbind);
146
147	ssh_callbacks_init(&cb);
148	ssh_set_server_callbacks(session, &cb);
149
150	if (ssh_handle_key_exchange(session))
151	{
152	log_error("ssh_handle_key_exchange: %s\n", ssh_get_error(session));
153	return 1;
154	}
155	ssh_set_auth_methods(session, SSH_AUTH_METHOD_PASSWORD \| SSH_AUTH_METHOD_GSSAPI_MIC);
156
157	event = ssh_event_new();
158	ssh_event_add_session(event, session);
159
160	while (!(authenticated && SSH_channel != NULL))
161	{
162	if (error)
163	break;
164	r = ssh_event_dopoll(event, -1);
165	if (r == SSH_ERROR)
166	{
167	log_error("Error : %s\n", ssh_get_error(session));
168	ssh_disconnect(session);
169	_exit(1);
170	}
171	}
172
173	if (error)
174	{
175	log_error("Error, exiting loop\n");
176	_exit(1);
177	}
178	else
179	{
180	log_common("Authenticated and got a channel\n");
181	}
182
183	snprintf(buf, sizeof(buf), "Hello, welcome to the Sample SSH proxy.\r\nPlease select your destination: ");
184	ssh_channel_write(SSH_channel, buf, (uint32_t)strlen(buf));
185	do
186	{
187	i = ssh_channel_read(SSH_channel, buf, sizeof(buf), 0);
188	if (i > 0)
189	{
190	ssh_channel_write(SSH_channel, buf, (uint32_t)i);
191	if (strlen(host) + (size_t)i < sizeof(host))
192	{
193	strncat(host, buf, (size_t)i);
194	}
195	if (strchr(host, '\x0d'))
196	{
197	*strchr(host, '\x0d') = '\0';
198	ssh_channel_write(SSH_channel, "\n", 1);
199	break;
200	}
201	}
202	else
203	{
204	log_error("Error: %s\n", ssh_get_error(session));
205	_exit(1);
206	}
207	} while (i > 0);
208	snprintf(buf, sizeof(buf), "Trying to connect to \"%s\"\r\n", host);
209	ssh_channel_write(SSH_channel, buf, (uint32_t)strlen(buf));
210	log_common("%s", buf);
211
212	ssh_disconnect(session);
213	ssh_free(session);
214
215	_exit(0);
216	case -1:
217	log_error("Failed to fork\n");
218	break;
219	}
220	}
221	else
222	{
223	log_error("%s\n", ssh_get_error(sshbind));
224	}
225
226	/* Since the session has been passed to a child fork, do some cleaning
227	* up at the parent process. */
228	ssh_disconnect(session);
229	ssh_free(session);
230	}
231
232	ssh_bind_free(sshbind);
233	ssh_finalize();
234
235	return 0;
236	}
237
238	int main(int argc, char *argv[])
239	{
240	if (log_begin("../log/bbsd.log", "../log/error.log") < 0)
241	{
242	printf("Open log error\n");
243	return -1;
244	}
245
246	log_common_redir(STDOUT_FILENO);
247	log_error_redir(STDERR_FILENO);
248
249	ssh_server("0.0.0.0", 2322);
250
251	log_end();
252
253	return 0;
254	}
webmaster@leafok.com	ViewVC Help
Powered by ViewVC 1.3.0-beta1