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feat: support multiple hotlines, use specific keychain channel for user verification
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DanyLE 2023-03-29 12:08:38 +02:00
parent d8eb1b34ce
commit 3121fc86a7
1 changed files with 308 additions and 163 deletions
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415
tunnel.c
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@ -22,22 +22,21 @@
#include <poll.h>
#define MAX_CHANNEL_NAME 64
#define HOT_LINE_SOCKET "antd_hotline.sock"
#define KEY_CHAIN_FIFO "antunnel_keychain"
#define SOCK_DIR_NAME "channels"
#define KEYCHAIN_CHANNEL "keychain"
#define COOKIE_NAME "sessionid"
#define MAX_CHANNEL_ID 65535u
#define KEY_LEN 40
#define USER_LEN 64
#define MAX_SESSION_TIMEOUT (15u * 60u) //15 min
#define MAX_BACK_LOG 64
#define MAX_SESSION_TIMEOUT (15u * 60u) // 15 min
#define PING_INTERVAL 10u // 10s
#define PROCESS_TIMEOUT 30000u //30 ms
#define PROCESS_TIMEOUT 30000u // 30 ms
#define MAX_CHANNEL_PATH 512
#define MAX_CHANNEL_PATH 108
#define MSG_MAGIC_BEGIN (uint16_t)0x414e //AN
#define MSG_MAGIC_END (uint16_t)0x5444 //TD
#define MSG_MAGIC_BEGIN (uint16_t)0x414e // AN
#define MSG_MAGIC_END (uint16_t)0x5444 // TD
#define CHANNEL_OK (uint8_t)0x0
#define CHANNEL_ERROR (uint8_t)0x1
@ -48,7 +47,7 @@
#define CHANNEL_DATA (uint8_t)0x6
#define CHANNEL_CTRL (uint8_t)0x7
#define TUNNEL_PING (uint8_t)0x8
//#define CHANNEL_LIST (uint8_t)0x7
// #define CHANNEL_LIST (uint8_t)0x7
typedef struct
{
int sock;
@ -56,6 +55,13 @@ typedef struct
bst_node_t *subscribers;
} antd_tunnel_channel_t;
typedef struct
{
int sock;
char address[MAX_CHANNEL_PATH];
int port;
} antd_tunnel_hotline_t;
typedef struct
{
uint8_t type;
@ -90,60 +96,21 @@ typedef struct
bst_node_t *channels;
bst_node_t *keychain;
pthread_t tid;
int hotline;
int key_fd;
bst_node_t *hotlines;
uint16_t id_allocator;
uint8_t initialized;
} antd_tunnel_t;
static antd_tunnel_t g_tunnel;
static int mk_keychain_fifo(const char *name, char *path)
{
// create the FIFO
(void)snprintf(path, MAX_CHANNEL_PATH, "%s/%s/%s", __plugin__.tmpdir, SOCK_DIR_NAME, name);
(void)unlink(path);
if (mkfifo(path, 0666) == -1)
{
ERROR("Unable to create keychain FIFO %s: %s", path, strerror(errno));
return -1;
}
int fifo_fd = open(path, O_RDWR);
if (fifo_fd == -1)
{
ERROR("Unable to open FIFO %s: %s", path, strerror(errno));
return -1;
}
LOG("Keychain FIFO: %s created", path);
return fifo_fd;
}
static int mk_socket(const char *name, char *path)
static int mk_un_socket(antd_tunnel_hotline_t *line)
{
struct sockaddr_un address;
address.sun_family = AF_UNIX;
// remove socket file if exists
(void)remove(line->address);
// create the socket
(void)snprintf(path, MAX_CHANNEL_PATH, "%s/%s/", __plugin__.tmpdir, SOCK_DIR_NAME);
LOG("Socket path is: %s, name %s", path, name);
if (!_exist(path))
{
LOG("Socket dir does not exist, create it: %s", path);
if (mkdir(path, 0755) == -1)
{
ERROR("Unable to create socket dir: %s =", strerror(errno));
return -1;
}
}
// Append the name of the socket
if (strlen(path) + strlen(name) > MAX_CHANNEL_PATH)
{
ERROR("Socket file path exceeds the maximal size of: %d", MAX_CHANNEL_PATH);
return -1;
}
(void)strcat(path, name);
(void)strncpy(address.sun_path, path, sizeof(address.sun_path));
(void)strncpy(address.sun_path, line->address, sizeof(address.sun_path));
int fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd == -1)
{
@ -153,17 +120,67 @@ static int mk_socket(const char *name, char *path)
if (bind(fd, (struct sockaddr *)(&address), sizeof(address)) == -1)
{
ERROR("Unable to bind name: %s to a socket: %s", address.sun_path, strerror(errno));
close(fd);
return -1;
}
// mark the socket as passive mode
if (listen(fd, 100) == -1)
if (listen(fd, MAX_BACK_LOG) == -1)
{
ERROR("Unable to listen to socket: %d (%s): %s", fd, path, strerror(errno));
ERROR("Unable to listen to socket: %d (%s): %s", fd, line->address, strerror(errno));
close(fd);
return -1;
}
LOG("Socket %s is created successfully: %d", path, fd);
LOG("Socket %s is created successfully: %d", line->address, fd);
return fd;
}
static int mk_tcp_socket(antd_tunnel_hotline_t *line)
{
int fd = -1;
struct sockaddr_in name;
fd = socket(PF_INET, SOCK_STREAM, 0);
if (fd == -1)
{
ERROR("Unable to create TCP socket socket: %s", strerror(errno));
return -1;
}
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &(int){1}, sizeof(int)) == -1)
{
ERROR("Unable to set reuse address on port %d - setsockopt: %s", line->port, strerror(errno));
}
memset(&name, 0, sizeof(name));
name.sin_family = AF_INET;
name.sin_port = htons(line->port);
name.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(fd, (struct sockaddr *)&name, sizeof(name)) < 0)
{
ERROR("Unable to bind TCP socket at port %d -bind: %s", line->port, strerror(errno));
close(fd);
return -1;
}
if (listen(fd, MAX_BACK_LOG) < 0)
{
ERROR("Unable to listen on Port %d - listen: %s", line->port, strerror(errno));
close(fd);
return -1;
}
return fd;
}
static int mk_socket(antd_tunnel_hotline_t *line)
{
if (line->port != -1)
{
return mk_tcp_socket(line);
}
else
{
return mk_un_socket(line);
}
}
static int msg_check_number(int fd, uint16_t number)
{
@ -304,7 +321,7 @@ static int msg_write(int fd, antd_tunnel_msg_t *msg)
ERROR("Unable to write msg channel id: %s", strerror(errno));
return -1;
}
//write client id
// write client id
net16 = htons(msg->header.client_id);
if (guard_write(fd, &net16, sizeof(msg->header.client_id)) == -1)
{
@ -453,7 +470,7 @@ static void channel_open(int fd, const char *name)
return;
}
// create socket file
(void)strncpy(channel->name, name, MAX_CHANNEL_NAME);
(void)snprintf(channel->name, MAX_CHANNEL_NAME, "%s", name);
channel->sock = fd;
// response with ok message
msg.header.type = CHANNEL_OK;
@ -468,6 +485,17 @@ static void channel_open(int fd, const char *name)
pthread_mutex_lock(&g_tunnel.lock);
g_tunnel.channels = bst_insert(g_tunnel.channels, hash_val, (void *)channel);
pthread_mutex_unlock(&g_tunnel.lock);
if(strncmp(name, KEYCHAIN_CHANNEL, strlen(KEYCHAIN_CHANNEL)) == 0)
{
// subscribe to it as special client
LOG("Subscribe to channel %s as special client", KEYCHAIN_CHANNEL);
msg.header.type = CHANNEL_SUBSCRIBE;
msg.header.size = 0;
if(msg_write(channel->sock,&msg) == -1)
{
ERROR("Unable to subscribe to %s for authentication", KEYCHAIN_CHANNEL);
}
}
}
static void channel_close(antd_tunnel_channel_t *channel)
@ -493,8 +521,18 @@ static void channel_close(antd_tunnel_channel_t *channel)
}
}
}
static void update_keychain(int listen_fd)
static void update_keychain(antd_tunnel_msg_t *msg)
{
if(msg->header.size <= KEY_LEN)
{
ERROR("Expected message data length greater than %d, got %d", KEY_LEN, msg->header.size);
return;
}
if(msg->header.size > KEY_LEN + USER_LEN)
{
ERROR("Expected message data length smaller than %d, got %d", KEY_LEN + USER_LEN, msg->header.size);
return;
}
antd_tunnel_key_t *key_p = (antd_tunnel_key_t *)malloc(sizeof(antd_tunnel_key_t));
if (key_p == NULL)
{
@ -503,28 +541,12 @@ static void update_keychain(int listen_fd)
}
(void)memset(key_p->hash, 0, KEY_LEN + 1);
(void)memset(key_p->user, 0, USER_LEN + 1);
int size;
if ((size = read(listen_fd, key_p->hash, KEY_LEN)) == -1)
{
ERROR("Unable to read data from keychain FIFO: %s", strerror(errno));
free(key_p);
return;
}
if (size != KEY_LEN)
{
ERROR("Invalid key size %d", size);
free(key_p);
return;
}
if ((size = read(listen_fd, key_p->user, USER_LEN)) == -1)
{
ERROR("Unable to read user from keychain FIFO: %s", strerror(errno));
free(key_p);
return;
}
(void)memcpy(key_p->hash, msg->data, KEY_LEN);
(void)memcpy(key_p->user, msg->data + KEY_LEN, msg->header.size - KEY_LEN);
LOG("User %s key %s", key_p->user, key_p->hash);
// looking for key in the keychain
int hash_val = simple_hash(key_p->hash);
pthread_mutex_lock(&g_tunnel.lock);
bst_node_t *node = bst_find(g_tunnel.keychain, hash_val);
if (node == NULL)
{
@ -539,7 +561,6 @@ static void update_keychain(int listen_fd)
LOG("Update existing key in the keychain for user %s", existing_key->user);
free(key_p);
}
pthread_mutex_unlock(&g_tunnel.lock);
}
static void monitor_hotline(int listen_fd)
{
@ -589,7 +610,7 @@ static void monitor_hotline(int listen_fd)
default:
msg.header.type = CHANNEL_ERROR;
(void)snprintf(buff, MAX_CHANNEL_NAME, "Unsupported msg type %d in hotline", (int)msg.header.type);
(void)snprintf(buff, MAX_CHANNEL_NAME, "Unsupported msg type %d in hotline %d", (int)msg.header.type, listen_fd);
msg.header.size = strlen(buff);
if (msg.data)
free(msg.data);
@ -597,11 +618,24 @@ static void monitor_hotline(int listen_fd)
LOG("%s", buff);
if (msg_write(fd, &msg) == -1)
{
ERROR("Unable to write error to hotline");
ERROR("Unable to write error to hotline %d", listen_fd);
}
break;
}
}
static void handle_hotline(bst_node_t *node, void **args, int argc)
{
(void)argc;
fd_set *fd_in = (fd_set *)args[0];
antd_tunnel_hotline_t *line = (antd_tunnel_hotline_t *)node->data;
if (FD_ISSET(line->sock, fd_in))
{
LOG("Got new data on hotline %d", line->sock);
monitor_hotline(line->sock);
}
}
static void handle_channel(bst_node_t *node, void **args, int argc)
{
antd_tunnel_msg_t msg;
@ -623,7 +657,7 @@ static void handle_channel(bst_node_t *node, void **args, int argc)
node->data = NULL;
return;
}
//LOG("Got new data on channel %s (%d)", channel->name, channel->sock);
// LOG("Got new data on channel %s (%d)", channel->name, channel->sock);
// handle msg read
if (msg_read(channel->sock, &msg) == -1)
{
@ -637,6 +671,23 @@ static void handle_channel(bst_node_t *node, void **args, int argc)
case CHANNEL_DATA:
case CHANNEL_UNSUBSCRIBE:
case CHANNEL_CTRL:
// special case, the channel is named keychain, which is used
// internally by tunnel and is not exposed to final user
// this channel has no subscriber
if((strncmp(channel->name, KEYCHAIN_CHANNEL, strlen(KEYCHAIN_CHANNEL)) == 0 ))
{
if(msg.header.type == CHANNEL_DATA)
{
// update keychain
update_keychain(&msg);
}
else
{
LOG("Ignore keychain message type: %d", msg.header.type);
}
}
else
{
// forward message to the correct client in the channel
msg.header.channel_id = node->key;
client = bst_find(channel->subscribers, msg.header.client_id);
@ -670,6 +721,7 @@ static void handle_channel(bst_node_t *node, void **args, int argc)
{
channel->subscribers = bst_delete(channel->subscribers, msg.header.client_id);
}
}
break;
case CHANNEL_CLOSE:
@ -687,7 +739,7 @@ static void handle_channel(bst_node_t *node, void **args, int argc)
free(msg.data);
}
}
static void set_sock_fd(bst_node_t *node, void **args, int argc)
static void set_channel_sock_fd(bst_node_t *node, void **args, int argc)
{
(void)argc;
fd_set *fd_in = (fd_set *)args[0];
@ -702,6 +754,21 @@ static void set_sock_fd(bst_node_t *node, void **args, int argc)
}
}
}
static void set_hotline_sock_fd(bst_node_t *node, void **args, int argc)
{
(void)argc;
fd_set *fd_in = (fd_set *)args[0];
int *max_fd = args[1];
antd_tunnel_hotline_t *line = (antd_tunnel_hotline_t *)node->data;
if (line != NULL && line->sock != -1)
{
FD_SET(line->sock, fd_in);
if (*max_fd < line->sock)
{
*max_fd = line->sock;
}
}
}
static void *multiplex(void *data_p)
{
int max_fdm;
@ -715,38 +782,30 @@ static void *multiplex(void *data_p)
while (status == 0)
{
FD_ZERO(&fd_in);
FD_SET(tunnel_p->hotline, &fd_in);
FD_SET(tunnel_p->key_fd, &fd_in);
max_fdm = tunnel_p->hotline > tunnel_p->key_fd ? tunnel_p->hotline : tunnel_p->key_fd;
max_fdm = 0;
pthread_mutex_lock(&tunnel_p->lock);
args[0] = (void *)&fd_in;
args[1] = (void *)&max_fdm;
bst_for_each(tunnel_p->channels, set_sock_fd, args, 2);
bst_for_each(tunnel_p->channels, set_channel_sock_fd, args, 2);
bst_for_each(tunnel_p->hotlines, set_hotline_sock_fd, args, 2);
pthread_mutex_unlock(&tunnel_p->lock);
rc = select(max_fdm + 1, &fd_in, NULL, NULL, NULL);
switch (rc)
{
case -1:
LOG("Error %d on select()\n", errno);
ERROR("Error on select(): %s", strerror(errno));
status = 1;
break;
case 0:
break;
// we have data
default:
if (FD_ISSET(tunnel_p->hotline, &fd_in))
{
// LOG("Got new data on hotline");
monitor_hotline(tunnel_p->hotline);
}
if (FD_ISSET(tunnel_p->key_fd, &fd_in))
{
update_keychain(tunnel_p->key_fd);
}
pthread_mutex_lock(&tunnel_p->lock);
closed_channels = list_init();
args[0] = (void *)&fd_in;
args[1] = (void *)&closed_channels;
bst_for_each(tunnel_p->hotlines, handle_hotline, args, 1);
pthread_mutex_lock(&tunnel_p->lock);
closed_channels = list_init();
bst_for_each(tunnel_p->channels, handle_channel, args, 2);
list_for_each(item, closed_channels)
{
@ -760,30 +819,102 @@ static void *multiplex(void *data_p)
return NULL;
}
static int init_hotlines()
{
char *tmp;
regmatch_t regex_matches[3];
// read plugin configuration
if (!__plugin__.config)
{
PLUGIN_PANIC("No plugin configuration found. Please specify it in server config file");
return -1;
}
tmp = (char *)dvalue(__plugin__.config, "hotlines");
// the hotlines can be multiple UNIX or TCP sockets separated by comma
// e.g antd plugin config: hotlines = unix:/tmp/hotline.sock,192.168.1.71:5533
if (!tmp)
{
PLUGIN_PANIC("No hotlines configuration found");
return -1;
}
// split the configuration by ,
list_t socket_list = split(tmp, ",");
antd_tunnel_hotline_t *line;
item_t item;
list_for_each(item, socket_list)
{
line = NULL;
tmp = (char *)item->value.ptr;
if (strncmp(tmp, "unix:", 5) == 0)
{
if (strlen(tmp + 5) > MAX_CHANNEL_PATH - 1)
{
ERROR("socket configuration is too long: %s", tmp);
continue;
}
line = (antd_tunnel_hotline_t *)malloc(sizeof(antd_tunnel_hotline_t));
line->port = -1;
snprintf(line->address, MAX_CHANNEL_PATH, "%s", tmp + 5);
LOG("Found Unix domain socket configuration: %s", line->address);
}
else if (regex_match("^([a-zA-Z0-9\\-_\\.]+):([0-9]+)$", tmp, 3, regex_matches))
{
if (regex_matches[1].rm_eo - regex_matches[1].rm_so > MAX_CHANNEL_PATH - 1)
{
ERROR("socket configuration is too long: %s", tmp);
continue;
}
line = (antd_tunnel_hotline_t *)malloc(sizeof(antd_tunnel_hotline_t));
memcpy(line->address, tmp + regex_matches[2].rm_so, regex_matches[2].rm_eo - regex_matches[2].rm_so);
line->port = atoi(line->address);
(void *)memset(line->address, 0, MAX_CHANNEL_PATH);
memcpy(line->address, tmp + regex_matches[1].rm_so, regex_matches[1].rm_eo - regex_matches[1].rm_so);
LOG("Found TCP socket configuration: %s:%d", line->address, line->port);
}
else
{
ERROR("Unknown socket configuration: %s", tmp);
continue;
}
// create the socket
if (line)
{
line->sock = mk_socket(line);
if (line->sock == -1)
{
ERROR("Unable to create hotline socket");
free(line);
line = NULL;
}
else
{
g_tunnel.hotlines = bst_insert(g_tunnel.hotlines, line->sock, (void *)line);
}
}
}
list_free(&socket_list);
// panic if not hotline
if (!g_tunnel.hotlines)
{
PLUGIN_PANIC("Unable to initialize tunnel hotlines");
return -1;
}
return 0;
}
void init()
{
char path[MAX_CHANNEL_PATH];
// initialise the lock
(void)pthread_mutex_init(&g_tunnel.lock, NULL);
// initialise the channel
g_tunnel.hotline = -1;
g_tunnel.hotlines = NULL;
g_tunnel.channels = NULL;
g_tunnel.id_allocator = 0;
g_tunnel.initialized = 0;
g_tunnel.keychain = NULL;
g_tunnel.key_fd = -1;
if ((g_tunnel.hotline = mk_socket(HOT_LINE_SOCKET, path)) == -1)
{
ERROR("Unable to create hotline socket");
destroy();
if (init_hotlines() != 0)
return;
}
if ((g_tunnel.key_fd = mk_keychain_fifo(KEY_CHAIN_FIFO, path)) == -1)
{
ERROR("Unable to create keychain FIFO");
destroy();
return;
}
// initialise the lock
(void)pthread_mutex_init(&g_tunnel.lock, NULL);
// create the thread
if (pthread_create(&g_tunnel.tid, NULL, (void *(*)(void *))multiplex, (void *)&g_tunnel) != 0)
{
@ -802,34 +933,34 @@ static void free_subscribers(bst_node_t *node, void **args, int argc)
destroy_channel(channel);
node->data = NULL;
}
static void free_hotlines(bst_node_t *node, void **args, int argc)
{
(void)argc;
(void)args;
antd_tunnel_hotline_t *line = (antd_tunnel_hotline_t *)node->data;
(void)close(node->key);
if (line->port == 0)
(void)unlink(line->address);
(void)free(node->data);
node->data = NULL;
}
void destroy()
{
char path[MAX_CHANNEL_PATH];
if (g_tunnel.initialized)
{
pthread_mutex_lock(&g_tunnel.lock);
bst_for_each(g_tunnel.channels, free_subscribers, NULL, 0);
bst_for_each(g_tunnel.hotlines, free_hotlines, NULL, 0);
pthread_mutex_unlock(&g_tunnel.lock);
(void)pthread_join(g_tunnel.tid, NULL);
bst_free(g_tunnel.channels);
bst_free(g_tunnel.keychain);
bst_free(g_tunnel.hotlines);
pthread_mutex_destroy(&g_tunnel.lock);
LOG("Antd tunnel is destroyed");
}
if (g_tunnel.hotline != -1)
{
(void)close(g_tunnel.hotline);
(void)snprintf(path, MAX_CHANNEL_PATH, "%s/%s/%s", __plugin__.tmpdir, SOCK_DIR_NAME, HOT_LINE_SOCKET);
(void)unlink(path);
}
if (g_tunnel.key_fd != -1)
{
(void)close(g_tunnel.key_fd);
(void)snprintf(path, MAX_CHANNEL_PATH, "%s/%s/%s", __plugin__.tmpdir, SOCK_DIR_NAME, KEY_CHAIN_FIFO);
(void)unlink(path);
}
}
static void process_client_message(antd_tunnel_msg_t *msg, antd_client_t *client, antd_tunnel_key_t * key)
static void process_client_message(antd_tunnel_msg_t *msg, antd_client_t *client, antd_tunnel_key_t *key)
{
char buff[BUFFLEN + 1];
bst_node_t *node;
@ -886,6 +1017,20 @@ static void process_client_message(antd_tunnel_msg_t *msg, antd_client_t *client
buff[msg->header.size] = '\0';
hash_val = hash(buff, MAX_CHANNEL_ID);
LOG("Requested channel: [%s]: %d", buff, hash_val);
if(strncmp(buff, KEYCHAIN_CHANNEL, strlen(KEYCHAIN_CHANNEL)) == 0)
{
// send error
msg->header.type = CHANNEL_ERROR;
(void)snprintf(buff, BUFFLEN,"Channel %s is reserved for internal use only", KEYCHAIN_CHANNEL);
msg->header.size = strlen(buff);
msg->data = (uint8_t *)buff;
ERROR("%s", buff);
if (write_msg_to_client(msg, client) != 0)
{
ERROR("Unable to send error message to client");
}
return;
}
}
else
{
@ -914,7 +1059,7 @@ static void process_client_message(antd_tunnel_msg_t *msg, antd_client_t *client
}
msg->header.client_id = g_tunnel.id_allocator;
msg->header.size = strlen(key->user) + 1;
(void)memset(buff,0, BUFFLEN + 1);
(void)memset(buff, 0, BUFFLEN + 1);
(void)memcpy(buff, key->user, msg->header.size - 1);
msg->header.type = CHANNEL_SUBSCRIBE;
}
@ -1102,7 +1247,7 @@ void *handle(void *rq_data)
timeout.tv_usec = PROCESS_TIMEOUT;
pfd.fd = client->sock;
pfd.events = POLLIN;
status = poll(&pfd, 1, PROCESS_TIMEOUT/ 1000);
status = poll(&pfd, 1, PROCESS_TIMEOUT / 1000);
switch (status)
{
case -1:
@ -1118,7 +1263,7 @@ void *handle(void *rq_data)
select(0, NULL, NULL, NULL, &timeout);
break;
default:
if(pfd.revents & (POLLERR | POLLHUP))
if (pfd.revents & (POLLERR | POLLHUP))
{
ERROR("POLLHUP or POLLERR found");
pthread_mutex_lock(&g_tunnel.lock);
@ -1211,7 +1356,7 @@ void *handle(void *rq_data)
{
LOG("Websocket: Text data is not supported");
pthread_mutex_lock(&g_tunnel.lock);
//ws_close(rq->client, 1011);
// ws_close(rq->client, 1011);
bst_for_each(g_tunnel.channels, unsubscribe_notify, argv, 1);
pthread_mutex_unlock(&g_tunnel.lock);
free(h);
@ -1250,7 +1395,7 @@ void *handle(void *rq_data)
{
// close the connection
pthread_mutex_lock(&g_tunnel.lock);
//ws_close(rq->client, 1011);
// ws_close(rq->client, 1011);
bst_for_each(g_tunnel.channels, unsubscribe_notify, argv, 1);
pthread_mutex_unlock(&g_tunnel.lock);
ERROR("Unable to ping client, close the connection: %d", client->sock);