[mirror_frr.git] / nhrpd / vici.c

/* strongSwan VICI protocol implementation for NHRP
 * Copyright (c) 2014-2015 Timo Teräs
 *
 * This file is free software: you may copy, redistribute and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>

#include "thread.h"
#include "zbuf.h"
#include "log.h"
#include "lib_errors.h"

#include "nhrpd.h"
#include "vici.h"
#include "nhrp_errors.h"

#define ERRNO_IO_RETRY(EN) (((EN) == EAGAIN) || ((EN) == EWOULDBLOCK) || ((EN) == EINTR))

struct blob {
	char *ptr;
	int len;
};

static int blob_equal(const struct blob *b, const char *str)
{
	if (!b || b->len != (int)strlen(str))
		return 0;
	return memcmp(b->ptr, str, b->len) == 0;
}

static int blob2buf(const struct blob *b, char *buf, size_t n)
{
	if (!b || b->len >= (int)n)
		return 0;
	memcpy(buf, b->ptr, b->len);
	buf[b->len] = 0;
	return 1;
}

struct vici_conn {
	struct thread *t_reconnect, *t_read, *t_write;
	struct zbuf ibuf;
	struct zbuf_queue obuf;
	int fd;
	uint8_t ibuf_data[VICI_MAX_MSGLEN];
};

struct vici_message_ctx {
	const char *sections[8];
	int nsections;
};

static void vici_reconnect(struct thread *t);
static void vici_submit_request(struct vici_conn *vici, const char *name, ...);

static void vici_zbuf_puts(struct zbuf *obuf, const char *str)
{
	size_t len = strlen(str);
	zbuf_put8(obuf, len);
	zbuf_put(obuf, str, len);
}

static void vici_connection_error(struct vici_conn *vici)
{
	nhrp_vc_reset();

	THREAD_OFF(vici->t_read);
	THREAD_OFF(vici->t_write);
	zbuf_reset(&vici->ibuf);
	zbufq_reset(&vici->obuf);

	close(vici->fd);
	vici->fd = -1;
	thread_add_timer(master, vici_reconnect, vici, 2, &vici->t_reconnect);
}

static void vici_parse_message(struct vici_conn *vici, struct zbuf *msg,
			       void (*parser)(struct vici_message_ctx *ctx,
					      enum vici_type_t msgtype,
					      const struct blob *key,
					      const struct blob *val),
			       struct vici_message_ctx *ctx)
{
	uint8_t *type;
	struct blob key = {0};
	struct blob val = {0};

	while ((type = zbuf_may_pull(msg, uint8_t)) != NULL) {
		switch (*type) {
		case VICI_SECTION_START:
			key.len = zbuf_get8(msg);
			key.ptr = zbuf_pulln(msg, key.len);
			debugf(NHRP_DEBUG_VICI, "VICI: Section start '%.*s'",
			       key.len, key.ptr);
			parser(ctx, *type, &key, NULL);
			ctx->nsections++;
			break;
		case VICI_SECTION_END:
			debugf(NHRP_DEBUG_VICI, "VICI: Section end");
			parser(ctx, *type, NULL, NULL);
			ctx->nsections--;
			break;
		case VICI_KEY_VALUE:
			key.len = zbuf_get8(msg);
			key.ptr = zbuf_pulln(msg, key.len);
			val.len = zbuf_get_be16(msg);
			val.ptr = zbuf_pulln(msg, val.len);
			debugf(NHRP_DEBUG_VICI, "VICI: Key '%.*s'='%.*s'",
			       key.len, key.ptr, val.len, val.ptr);
			parser(ctx, *type, &key, &val);
			break;
		case VICI_LIST_START:
			key.len = zbuf_get8(msg);
			key.ptr = zbuf_pulln(msg, key.len);
			debugf(NHRP_DEBUG_VICI, "VICI: List start '%.*s'",
			       key.len, key.ptr);
			break;
		case VICI_LIST_ITEM:
			val.len = zbuf_get_be16(msg);
			val.ptr = zbuf_pulln(msg, val.len);
			debugf(NHRP_DEBUG_VICI, "VICI: List item: '%.*s'",
			       val.len, val.ptr);
			parser(ctx, *type, &key, &val);
			break;
		case VICI_LIST_END:
			debugf(NHRP_DEBUG_VICI, "VICI: List end");
			break;
		default:
			debugf(NHRP_DEBUG_VICI,
			       "VICI: Unsupported message component type %d",
			       *type);
			return;
		}
	}
}

struct handle_sa_ctx {
	struct vici_message_ctx msgctx;
	int event;
	int child_ok;
	int kill_ikesa;
	uint32_t child_uniqueid, ike_uniqueid;
	struct {
		union sockunion host;
		struct blob id, cert;
	} local, remote;
};

static void parse_sa_message(struct vici_message_ctx *ctx,
			     enum vici_type_t msgtype, const struct blob *key,
			     const struct blob *val)
{
	struct handle_sa_ctx *sactx =
		container_of(ctx, struct handle_sa_ctx, msgctx);
	struct nhrp_vc *vc;
	char buf[512];

	switch (msgtype) {
	case VICI_SECTION_START:
		if (ctx->nsections == 3) {
			/* Begin of child-sa section, reset child vars */
			sactx->child_uniqueid = 0;
			sactx->child_ok = 0;
		}
		break;
	case VICI_SECTION_END:
		if (ctx->nsections == 3) {
			/* End of child-sa section, update nhrp_vc */
			int up = sactx->child_ok || sactx->event == 1;
			if (up) {
				vc = nhrp_vc_get(&sactx->local.host,
						 &sactx->remote.host, up);
				if (vc) {
					blob2buf(&sactx->local.id, vc->local.id,
						 sizeof(vc->local.id));
					if (blob2buf(&sactx->local.cert,
						     (char *)vc->local.cert,
						     sizeof(vc->local.cert)))
						vc->local.certlen =
							sactx->local.cert.len;
					blob2buf(&sactx->remote.id,
						 vc->remote.id,
						 sizeof(vc->remote.id));
					if (blob2buf(&sactx->remote.cert,
						     (char *)vc->remote.cert,
						     sizeof(vc->remote.cert)))
						vc->remote.certlen =
							sactx->remote.cert.len;
					sactx->kill_ikesa |=
						nhrp_vc_ipsec_updown(
							sactx->child_uniqueid,
							vc);
					vc->ike_uniqueid = sactx->ike_uniqueid;
				}
			} else {
				nhrp_vc_ipsec_updown(sactx->child_uniqueid, 0);
			}
		}
		break;
	default:
		if (!key || !key->ptr)
			break;

		switch (key->ptr[0]) {
		case 'l':
			if (blob_equal(key, "local-host")
			    && ctx->nsections == 1) {
				if (blob2buf(val, buf, sizeof(buf)))
					if (str2sockunion(buf,
							  &sactx->local.host)
					    < 0)
						flog_err(
							EC_NHRP_SWAN,
							"VICI: bad strongSwan local-host: %s",
							buf);
			} else if (blob_equal(key, "local-id")
				   && ctx->nsections == 1) {
				sactx->local.id = *val;
			} else if (blob_equal(key, "local-cert-data")
				   && ctx->nsections == 1) {
				sactx->local.cert = *val;
			}
			break;
		case 'r':
			if (blob_equal(key, "remote-host")
			    && ctx->nsections == 1) {
				if (blob2buf(val, buf, sizeof(buf)))
					if (str2sockunion(buf,
							  &sactx->remote.host)
					    < 0)
						flog_err(
							EC_NHRP_SWAN,
							"VICI: bad strongSwan remote-host: %s",
							buf);
			} else if (blob_equal(key, "remote-id")
				   && ctx->nsections == 1) {
				sactx->remote.id = *val;
			} else if (blob_equal(key, "remote-cert-data")
				   && ctx->nsections == 1) {
				sactx->remote.cert = *val;
			}
			break;
		case 'u':
			if (blob_equal(key, "uniqueid")
			    && blob2buf(val, buf, sizeof(buf))) {
				if (ctx->nsections == 3)
					sactx->child_uniqueid =
						strtoul(buf, NULL, 0);
				else if (ctx->nsections == 1)
					sactx->ike_uniqueid =
						strtoul(buf, NULL, 0);
			}
			break;
		case 's':
			if (blob_equal(key, "state") && ctx->nsections == 3) {
				sactx->child_ok =
					(sactx->event == 0
					 && (blob_equal(val, "INSTALLED")
					     || blob_equal(val, "REKEYED")));
			}
			break;
		}
		break;
	}
}

static void parse_cmd_response(struct vici_message_ctx *ctx,
			       enum vici_type_t msgtype, const struct blob *key,
			       const struct blob *val)
{
	char buf[512];

	switch (msgtype) {
	case VICI_KEY_VALUE:
		if (blob_equal(key, "errmsg")
		    && blob2buf(val, buf, sizeof(buf)))
			flog_err(EC_NHRP_SWAN, "VICI: strongSwan: %s", buf);
		break;
	default:
		break;
	}
}

static void vici_recv_sa(struct vici_conn *vici, struct zbuf *msg, int event)
{
	char buf[32];
	struct handle_sa_ctx ctx = {
		.event = event,
		.msgctx.nsections = 0
	};

	vici_parse_message(vici, msg, parse_sa_message, &ctx.msgctx);

	if (ctx.kill_ikesa && ctx.ike_uniqueid) {
		debugf(NHRP_DEBUG_COMMON, "VICI: Deleting IKE_SA %u",
		       ctx.ike_uniqueid);
		snprintf(buf, sizeof(buf), "%u", ctx.ike_uniqueid);
		vici_submit_request(vici, "terminate", VICI_KEY_VALUE, "ike-id",
				    strlen(buf), buf, VICI_END);
	}
}

static void vici_recv_message(struct vici_conn *vici, struct zbuf *msg)
{
	uint32_t msglen;
	uint8_t msgtype;
	struct blob name;
	struct vici_message_ctx ctx = { .nsections = 0 };

	msglen = zbuf_get_be32(msg);
	msgtype = zbuf_get8(msg);
	debugf(NHRP_DEBUG_VICI, "VICI: Message %d, %d bytes", msgtype, msglen);

	switch (msgtype) {
	case VICI_EVENT:
		name.len = zbuf_get8(msg);
		name.ptr = zbuf_pulln(msg, name.len);

		debugf(NHRP_DEBUG_VICI, "VICI: Event '%.*s'", name.len,
		       name.ptr);
		if (blob_equal(&name, "list-sa")
		    || blob_equal(&name, "child-updown")
		    || blob_equal(&name, "child-rekey"))
			vici_recv_sa(vici, msg, 0);
		else if (blob_equal(&name, "child-state-installed")
			 || blob_equal(&name, "child-state-rekeyed"))
			vici_recv_sa(vici, msg, 1);
		else if (blob_equal(&name, "child-state-destroying"))
			vici_recv_sa(vici, msg, 2);
		break;
	case VICI_CMD_RESPONSE:
		vici_parse_message(vici, msg, parse_cmd_response, &ctx);
		break;
	case VICI_EVENT_UNKNOWN:
	case VICI_CMD_UNKNOWN:
		flog_err(
			EC_NHRP_SWAN,
			"VICI: StrongSwan does not support mandatory events (unpatched?)");
		break;
	case VICI_EVENT_CONFIRM:
		break;
	default:
		zlog_notice("VICI: Unrecognized message type %d", msgtype);
		break;
	}
}

static void vici_read(struct thread *t)
{
	struct vici_conn *vici = THREAD_ARG(t);
	struct zbuf *ibuf = &vici->ibuf;
	struct zbuf pktbuf;

	if (zbuf_read(ibuf, vici->fd, (size_t)-1) < 0) {
		vici_connection_error(vici);
		return;
	}

	/* Process all messages in buffer */
	do {
		uint32_t *hdrlen = zbuf_may_pull(ibuf, uint32_t);
		if (!hdrlen)
			break;
		if (!zbuf_may_pulln(ibuf, ntohl(*hdrlen))) {
			zbuf_reset_head(ibuf, hdrlen);
			break;
		}

		/* Handle packet */
		zbuf_init(&pktbuf, hdrlen, htonl(*hdrlen) + 4,
			  htonl(*hdrlen) + 4);
		vici_recv_message(vici, &pktbuf);
	} while (1);

	thread_add_read(master, vici_read, vici, vici->fd, &vici->t_read);
}

static void vici_write(struct thread *t)
{
	struct vici_conn *vici = THREAD_ARG(t);
	int r;

	r = zbufq_write(&vici->obuf, vici->fd);
	if (r > 0) {
		thread_add_write(master, vici_write, vici, vici->fd,
				 &vici->t_write);
	} else if (r < 0) {
		vici_connection_error(vici);
	}
}

static void vici_submit(struct vici_conn *vici, struct zbuf *obuf)
{
	if (vici->fd < 0) {
		zbuf_free(obuf);
		return;
	}

	zbufq_queue(&vici->obuf, obuf);
	thread_add_write(master, vici_write, vici, vici->fd, &vici->t_write);
}

static void vici_submit_request(struct vici_conn *vici, const char *name, ...)
{
	struct zbuf *obuf;
	uint32_t *hdrlen;
	va_list va;
	size_t len;
	int type;

	obuf = zbuf_alloc(256);
	if (!obuf)
		return;

	hdrlen = zbuf_push(obuf, uint32_t);
	zbuf_put8(obuf, VICI_CMD_REQUEST);
	vici_zbuf_puts(obuf, name);

	va_start(va, name);
	for (type = va_arg(va, int); type != VICI_END; type = va_arg(va, int)) {
		zbuf_put8(obuf, type);
		switch (type) {
		case VICI_KEY_VALUE:
			vici_zbuf_puts(obuf, va_arg(va, const char *));
			len = va_arg(va, size_t);
			zbuf_put_be16(obuf, len);
			zbuf_put(obuf, va_arg(va, void *), len);
			break;
		default:
			break;
		}
	}
	va_end(va);
	*hdrlen = htonl(zbuf_used(obuf) - 4);
	vici_submit(vici, obuf);
}

static void vici_register_event(struct vici_conn *vici, const char *name)
{
	struct zbuf *obuf;
	uint32_t *hdrlen;
	uint8_t namelen;

	namelen = strlen(name);
	obuf = zbuf_alloc(4 + 1 + 1 + namelen);
	if (!obuf)
		return;

	hdrlen = zbuf_push(obuf, uint32_t);
	zbuf_put8(obuf, VICI_EVENT_REGISTER);
	zbuf_put8(obuf, namelen);
	zbuf_put(obuf, name, namelen);
	*hdrlen = htonl(zbuf_used(obuf) - 4);

	vici_submit(vici, obuf);
}

static bool vici_charon_filepath_done;
static bool vici_charon_not_found;

static char *vici_get_charon_filepath(void)
{
	static char buff[1200];
	FILE *fp;
	char *ptr;
	char line[1024];

	if (vici_charon_filepath_done)
		return (char *)buff;
	fp = popen("ipsec --piddir", "r");
	if (!fp) {
		if (!vici_charon_not_found) {
			flog_err(EC_NHRP_SWAN,
				 "VICI: Failed to retrieve charon file path");
			vici_charon_not_found = true;
		}
		return NULL;
	}
	/* last line of output is used to get vici path */
	while (fgets(line, sizeof(line), fp) != NULL) {
		ptr = strchr(line, '\n');
		if (ptr)
			*ptr = '\0';
		snprintf(buff, sizeof(buff), "%s/charon.vici", line);
	}
	pclose(fp);
	vici_charon_filepath_done = true;
	return buff;
}

static void vici_reconnect(struct thread *t)
{
	struct vici_conn *vici = THREAD_ARG(t);
	int fd;
	char *file_path;

	if (vici->fd >= 0)
		return;

	fd = sock_open_unix(VICI_SOCKET);
	if (fd < 0) {
		file_path = vici_get_charon_filepath();
		if (file_path)
			fd = sock_open_unix(file_path);
	}
	if (fd < 0) {
		debugf(NHRP_DEBUG_VICI,
		       "%s: failure connecting VICI socket: %s", __func__,
		       strerror(errno));
		thread_add_timer(master, vici_reconnect, vici, 2,
				 &vici->t_reconnect);
		return;
	}

	debugf(NHRP_DEBUG_COMMON, "VICI: Connected");
	vici->fd = fd;
	thread_add_read(master, vici_read, vici, vici->fd, &vici->t_read);

	/* Send event subscribtions */
	// vici_register_event(vici, "child-updown");
	// vici_register_event(vici, "child-rekey");
	vici_register_event(vici, "child-state-installed");
	vici_register_event(vici, "child-state-rekeyed");
	vici_register_event(vici, "child-state-destroying");
	vici_register_event(vici, "list-sa");
	vici_submit_request(vici, "list-sas", VICI_END);
}

static struct vici_conn vici_connection;

void vici_init(void)
{
	struct vici_conn *vici = &vici_connection;

	vici->fd = -1;
	zbuf_init(&vici->ibuf, vici->ibuf_data, sizeof(vici->ibuf_data), 0);
	zbufq_init(&vici->obuf);
	thread_add_timer_msec(master, vici_reconnect, vici, 10,
			      &vici->t_reconnect);
}

void vici_terminate(void)
{
}

void vici_terminate_vc_by_profile_name(char *profile_name)
{
	struct vici_conn *vici = &vici_connection;

	debugf(NHRP_DEBUG_VICI, "Terminate profile = %s", profile_name);
	vici_submit_request(vici, "terminate", VICI_KEY_VALUE, "ike",
		    strlen(profile_name), profile_name, VICI_END);
}

void vici_terminate_vc_by_ike_id(unsigned int ike_id)
{
	struct vici_conn *vici = &vici_connection;
	char ike_id_str[10];

	snprintf(ike_id_str, sizeof(ike_id_str), "%d", ike_id);
	debugf(NHRP_DEBUG_VICI, "Terminate ike_id_str = %s", ike_id_str);
	vici_submit_request(vici, "terminate", VICI_KEY_VALUE, "ike-id",
		    strlen(ike_id_str), ike_id_str, VICI_END);
}

void vici_request_vc(const char *profile, union sockunion *src,
		     union sockunion *dst, int prio)
{
	struct vici_conn *vici = &vici_connection;
	char buf[2][SU_ADDRSTRLEN];

	sockunion2str(src, buf[0], sizeof(buf[0]));
	sockunion2str(dst, buf[1], sizeof(buf[1]));

	vici_submit_request(vici, "initiate", VICI_KEY_VALUE, "child",
			    strlen(profile), profile, VICI_KEY_VALUE, "timeout",
			    (size_t)2, "-1", VICI_KEY_VALUE, "async", (size_t)1,
			    "1", VICI_KEY_VALUE, "init-limits", (size_t)1,
			    prio ? "0" : "1", VICI_KEY_VALUE, "my-host",
			    strlen(buf[0]), buf[0], VICI_KEY_VALUE,
			    "other-host", strlen(buf[1]), buf[1], VICI_END);
}

int sock_open_unix(const char *path)
{
	int ret, fd;
	struct sockaddr_un addr;

	fd = socket(AF_UNIX, SOCK_STREAM, 0);
	if (fd < 0)
		return -1;

	memset(&addr, 0, sizeof(addr));
	addr.sun_family = AF_UNIX;
	strlcpy(addr.sun_path, path, sizeof(addr.sun_path));

	ret = connect(fd, (struct sockaddr *)&addr,
		      sizeof(addr.sun_family) + strlen(addr.sun_path));
	if (ret < 0) {
		close(fd);
		return -1;
	}

	ret = fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);
	if (ret < 0) {
		close(fd);
		return -1;
	}

	return fd;
}
Commit	Line	Data
2fb975da TT	1	/* strongSwan VICI protocol implementation for NHRP
	2	* Copyright (c) 2014-2015 Timo Teräs
	3	*
	4	* This file is free software: you may copy, redistribute and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation, either version 2 of the License, or
	7	* (at your option) any later version.
	8	*/
	9
b45ac5f5 DL	10	#ifdef HAVE_CONFIG_H
	11	#include "config.h"
	12	#endif
	13
2fb975da TT	14	#include <string.h>
	15	#include <sys/socket.h>
	16	#include <sys/un.h>
	17
	18	#include "thread.h"
	19	#include "zbuf.h"
	20	#include "log.h"
aed07011	21	#include "lib_errors.h"
2fb975da	22
aed07011	23	#include "nhrpd.h"
2fb975da	24	#include "vici.h"
aed07011	25	#include "nhrp_errors.h"
2fb975da TT	26
	27	#define ERRNO_IO_RETRY(EN) (((EN) == EAGAIN) \|\| ((EN) == EWOULDBLOCK) \|\| ((EN) == EINTR))
	28
	29	struct blob {
	30	char *ptr;
	31	int len;
	32	};
	33
	34	static int blob_equal(const struct blob b, const char str)
	35	{
996c9314 LB	36	if (!b \|\| b->len != (int)strlen(str))
996c9314 LB	37	return 0;
2fb975da TT	38	return memcmp(b->ptr, str, b->len) == 0;
	39	}
	40
	41	static int blob2buf(const struct blob b, char buf, size_t n)
	42	{
996c9314 LB	43	if (!b \|\| b->len >= (int)n)
996c9314 LB	44	return 0;
2fb975da TT	45	memcpy(buf, b->ptr, b->len);
	46	buf[b->len] = 0;
	47	return 1;
	48	}
	49
	50	struct vici_conn {
	51	struct thread t_reconnect, t_read, *t_write;
	52	struct zbuf ibuf;
	53	struct zbuf_queue obuf;
	54	int fd;
	55	uint8_t ibuf_data[VICI_MAX_MSGLEN];
	56	};
	57
	58	struct vici_message_ctx {
	59	const char *sections[8];
	60	int nsections;
	61	};
	62
cc9f21da	63	static void vici_reconnect(struct thread *t);
2fb975da TT	64	static void vici_submit_request(struct vici_conn vici, const char name, ...);
	65
	66	static void vici_zbuf_puts(struct zbuf obuf, const char str)
	67	{
	68	size_t len = strlen(str);
	69	zbuf_put8(obuf, len);
	70	zbuf_put(obuf, str, len);
	71	}
	72
	73	static void vici_connection_error(struct vici_conn *vici)
	74	{
	75	nhrp_vc_reset();
	76
	77	THREAD_OFF(vici->t_read);
	78	THREAD_OFF(vici->t_write);
	79	zbuf_reset(&vici->ibuf);
	80	zbufq_reset(&vici->obuf);
	81
	82	close(vici->fd);
	83	vici->fd = -1;
ffa2c898	84	thread_add_timer(master, vici_reconnect, vici, 2, &vici->t_reconnect);
2fb975da TT	85	}
2fb975da TT	86
996c9314 LB	87	static void vici_parse_message(struct vici_conn vici, struct zbuf msg,
	88	void (parser)(struct vici_message_ctx ctx,
	89	enum vici_type_t msgtype,
	90	const struct blob *key,
	91	const struct blob *val),
	92	struct vici_message_ctx *ctx)
2fb975da TT	93	{
2fb975da TT	94	uint8_t *type;
996c9314 LB	95	struct blob key = {0};
996c9314 LB	96	struct blob val = {0};
2fb975da TT	97
	98	while ((type = zbuf_may_pull(msg, uint8_t)) != NULL) {
	99	switch (*type) {
	100	case VICI_SECTION_START:
	101	key.len = zbuf_get8(msg);
	102	key.ptr = zbuf_pulln(msg, key.len);
996c9314 LB	103	debugf(NHRP_DEBUG_VICI, "VICI: Section start '%.*s'",
996c9314 LB	104	key.len, key.ptr);
2fb975da TT	105	parser(ctx, *type, &key, NULL);
	106	ctx->nsections++;
	107	break;
	108	case VICI_SECTION_END:
	109	debugf(NHRP_DEBUG_VICI, "VICI: Section end");
	110	parser(ctx, *type, NULL, NULL);
	111	ctx->nsections--;
	112	break;
	113	case VICI_KEY_VALUE:
	114	key.len = zbuf_get8(msg);
	115	key.ptr = zbuf_pulln(msg, key.len);
	116	val.len = zbuf_get_be16(msg);
	117	val.ptr = zbuf_pulln(msg, val.len);
996c9314 LB	118	debugf(NHRP_DEBUG_VICI, "VICI: Key '%.s'='%.s'",
996c9314 LB	119	key.len, key.ptr, val.len, val.ptr);
2fb975da TT	120	parser(ctx, *type, &key, &val);
	121	break;
	122	case VICI_LIST_START:
	123	key.len = zbuf_get8(msg);
	124	key.ptr = zbuf_pulln(msg, key.len);
996c9314 LB	125	debugf(NHRP_DEBUG_VICI, "VICI: List start '%.*s'",
996c9314 LB	126	key.len, key.ptr);
2fb975da TT	127	break;
	128	case VICI_LIST_ITEM:
	129	val.len = zbuf_get_be16(msg);
	130	val.ptr = zbuf_pulln(msg, val.len);
996c9314 LB	131	debugf(NHRP_DEBUG_VICI, "VICI: List item: '%.*s'",
996c9314 LB	132	val.len, val.ptr);
2fb975da TT	133	parser(ctx, *type, &key, &val);
	134	break;
	135	case VICI_LIST_END:
	136	debugf(NHRP_DEBUG_VICI, "VICI: List end");
	137	break;
	138	default:
996c9314 LB	139	debugf(NHRP_DEBUG_VICI,
	140	"VICI: Unsupported message component type %d",
	141	*type);
2fb975da TT	142	return;
	143	}
	144	}
	145	}
	146
	147	struct handle_sa_ctx {
	148	struct vici_message_ctx msgctx;
	149	int event;
	150	int child_ok;
	151	int kill_ikesa;
	152	uint32_t child_uniqueid, ike_uniqueid;
	153	struct {
	154	union sockunion host;
	155	struct blob id, cert;
	156	} local, remote;
	157	};
	158
996c9314 LB	159	static void parse_sa_message(struct vici_message_ctx *ctx,
	160	enum vici_type_t msgtype, const struct blob *key,
	161	const struct blob *val)
2fb975da	162	{
996c9314 LB	163	struct handle_sa_ctx *sactx =
996c9314 LB	164	container_of(ctx, struct handle_sa_ctx, msgctx);
2fb975da TT	165	struct nhrp_vc *vc;
	166	char buf[512];
	167
	168	switch (msgtype) {
	169	case VICI_SECTION_START:
	170	if (ctx->nsections == 3) {
	171	/* Begin of child-sa section, reset child vars */
	172	sactx->child_uniqueid = 0;
	173	sactx->child_ok = 0;
	174	}
	175	break;
	176	case VICI_SECTION_END:
	177	if (ctx->nsections == 3) {
	178	/* End of child-sa section, update nhrp_vc */
	179	int up = sactx->child_ok \|\| sactx->event == 1;
	180	if (up) {
996c9314 LB	181	vc = nhrp_vc_get(&sactx->local.host,
996c9314 LB	182	&sactx->remote.host, up);
2fb975da	183	if (vc) {
996c9314 LB	184	blob2buf(&sactx->local.id, vc->local.id,
	185	sizeof(vc->local.id));
	186	if (blob2buf(&sactx->local.cert,
	187	(char *)vc->local.cert,
	188	sizeof(vc->local.cert)))
	189	vc->local.certlen =
	190	sactx->local.cert.len;
	191	blob2buf(&sactx->remote.id,
	192	vc->remote.id,
	193	sizeof(vc->remote.id));
	194	if (blob2buf(&sactx->remote.cert,
	195	(char *)vc->remote.cert,
	196	sizeof(vc->remote.cert)))
	197	vc->remote.certlen =
	198	sactx->remote.cert.len;
	199	sactx->kill_ikesa \|=
	200	nhrp_vc_ipsec_updown(
	201	sactx->child_uniqueid,
	202	vc);
4cbaf956	203	vc->ike_uniqueid = sactx->ike_uniqueid;
2fb975da TT	204	}
	205	} else {
	206	nhrp_vc_ipsec_updown(sactx->child_uniqueid, 0);
	207	}
	208	}
	209	break;
	210	default:
fa3bf3a2	211	if (!key \|\| !key->ptr)
6b07f6e1 JB	212	break;
6b07f6e1 JB	213
2fb975da TT	214	switch (key->ptr[0]) {
2fb975da TT	215	case 'l':
996c9314 LB	216	if (blob_equal(key, "local-host")
996c9314 LB	217	&& ctx->nsections == 1) {
2fb975da	218	if (blob2buf(val, buf, sizeof(buf)))
996c9314 LB	219	if (str2sockunion(buf,
	220	&sactx->local.host)
	221	< 0)
1c50c1c0 QY	222	flog_err(
	223	EC_NHRP_SWAN,
	224	"VICI: bad strongSwan local-host: %s",
	225	buf);
996c9314 LB	226	} else if (blob_equal(key, "local-id")
996c9314 LB	227	&& ctx->nsections == 1) {
2fb975da	228	sactx->local.id = *val;
996c9314 LB	229	} else if (blob_equal(key, "local-cert-data")
996c9314 LB	230	&& ctx->nsections == 1) {
2fb975da TT	231	sactx->local.cert = *val;
	232	}
	233	break;
	234	case 'r':
996c9314 LB	235	if (blob_equal(key, "remote-host")
996c9314 LB	236	&& ctx->nsections == 1) {
2fb975da	237	if (blob2buf(val, buf, sizeof(buf)))
996c9314 LB	238	if (str2sockunion(buf,
	239	&sactx->remote.host)
	240	< 0)
1c50c1c0 QY	241	flog_err(
	242	EC_NHRP_SWAN,
	243	"VICI: bad strongSwan remote-host: %s",
	244	buf);
996c9314 LB	245	} else if (blob_equal(key, "remote-id")
996c9314 LB	246	&& ctx->nsections == 1) {
2fb975da	247	sactx->remote.id = *val;
996c9314 LB	248	} else if (blob_equal(key, "remote-cert-data")
996c9314 LB	249	&& ctx->nsections == 1) {
2fb975da TT	250	sactx->remote.cert = *val;
	251	}
	252	break;
	253	case 'u':
996c9314 LB	254	if (blob_equal(key, "uniqueid")
996c9314 LB	255	&& blob2buf(val, buf, sizeof(buf))) {
2fb975da	256	if (ctx->nsections == 3)
996c9314 LB	257	sactx->child_uniqueid =
996c9314 LB	258	strtoul(buf, NULL, 0);
2fb975da	259	else if (ctx->nsections == 1)
996c9314 LB	260	sactx->ike_uniqueid =
996c9314 LB	261	strtoul(buf, NULL, 0);
2fb975da TT	262	}
	263	break;
	264	case 's':
	265	if (blob_equal(key, "state") && ctx->nsections == 3) {
	266	sactx->child_ok =
996c9314 LB	267	(sactx->event == 0
	268	&& (blob_equal(val, "INSTALLED")
	269	\|\| blob_equal(val, "REKEYED")));
2fb975da TT	270	}
	271	break;
	272	}
	273	break;
	274	}
	275	}
	276
996c9314 LB	277	static void parse_cmd_response(struct vici_message_ctx *ctx,
	278	enum vici_type_t msgtype, const struct blob *key,
	279	const struct blob *val)
d139786a TT	280	{
	281	char buf[512];
	282
	283	switch (msgtype) {
	284	case VICI_KEY_VALUE:
996c9314 LB	285	if (blob_equal(key, "errmsg")
996c9314 LB	286	&& blob2buf(val, buf, sizeof(buf)))
2b84a521	287	flog_err(EC_NHRP_SWAN, "VICI: strongSwan: %s", buf);
d139786a TT	288	break;
	289	default:
	290	break;
	291	}
	292	}
	293
2fb975da TT	294	static void vici_recv_sa(struct vici_conn vici, struct zbuf msg, int event)
	295	{
	296	char buf[32];
	297	struct handle_sa_ctx ctx = {
	298	.event = event,
0a939f4f	299	.msgctx.nsections = 0
2fb975da TT	300	};
	301
	302	vici_parse_message(vici, msg, parse_sa_message, &ctx.msgctx);
	303
	304	if (ctx.kill_ikesa && ctx.ike_uniqueid) {
996c9314 LB	305	debugf(NHRP_DEBUG_COMMON, "VICI: Deleting IKE_SA %u",
996c9314 LB	306	ctx.ike_uniqueid);
0d6f7fd6	307	snprintf(buf, sizeof(buf), "%u", ctx.ike_uniqueid);
996c9314 LB	308	vici_submit_request(vici, "terminate", VICI_KEY_VALUE, "ike-id",
996c9314 LB	309	strlen(buf), buf, VICI_END);
2fb975da TT	310	}
	311	}
	312
	313	static void vici_recv_message(struct vici_conn vici, struct zbuf msg)
	314	{
	315	uint32_t msglen;
	316	uint8_t msgtype;
	317	struct blob name;
7ea5df54	318	struct vici_message_ctx ctx = { .nsections = 0 };
2fb975da TT	319
	320	msglen = zbuf_get_be32(msg);
	321	msgtype = zbuf_get8(msg);
	322	debugf(NHRP_DEBUG_VICI, "VICI: Message %d, %d bytes", msgtype, msglen);
	323
	324	switch (msgtype) {
	325	case VICI_EVENT:
	326	name.len = zbuf_get8(msg);
	327	name.ptr = zbuf_pulln(msg, name.len);
	328
996c9314 LB	329	debugf(NHRP_DEBUG_VICI, "VICI: Event '%.*s'", name.len,
	330	name.ptr);
	331	if (blob_equal(&name, "list-sa")
	332	\|\| blob_equal(&name, "child-updown")
	333	\|\| blob_equal(&name, "child-rekey"))
2fb975da	334	vici_recv_sa(vici, msg, 0);
996c9314 LB	335	else if (blob_equal(&name, "child-state-installed")
996c9314 LB	336	\|\| blob_equal(&name, "child-state-rekeyed"))
2fb975da TT	337	vici_recv_sa(vici, msg, 1);
	338	else if (blob_equal(&name, "child-state-destroying"))
	339	vici_recv_sa(vici, msg, 2);
	340	break;
d139786a	341	case VICI_CMD_RESPONSE:
6c8ca260	342	vici_parse_message(vici, msg, parse_cmd_response, &ctx);
d139786a	343	break;
2fb975da	344	case VICI_EVENT_UNKNOWN:
d139786a	345	case VICI_CMD_UNKNOWN:
1c50c1c0 QY	346	flog_err(
1c50c1c0 QY	347	EC_NHRP_SWAN,
996c9314	348	"VICI: StrongSwan does not support mandatory events (unpatched?)");
2fb975da TT	349	break;
2fb975da TT	350	case VICI_EVENT_CONFIRM:
2fb975da TT	351	break;
	352	default:
	353	zlog_notice("VICI: Unrecognized message type %d", msgtype);
	354	break;
	355	}
	356	}
	357
cc9f21da	358	static void vici_read(struct thread *t)
2fb975da TT	359	{
	360	struct vici_conn *vici = THREAD_ARG(t);
	361	struct zbuf *ibuf = &vici->ibuf;
	362	struct zbuf pktbuf;
	363
996c9314	364	if (zbuf_read(ibuf, vici->fd, (size_t)-1) < 0) {
2fb975da	365	vici_connection_error(vici);
cc9f21da	366	return;
2fb975da TT	367	}
	368
	369	/* Process all messages in buffer */
	370	do {
	371	uint32_t *hdrlen = zbuf_may_pull(ibuf, uint32_t);
	372	if (!hdrlen)
	373	break;
	374	if (!zbuf_may_pulln(ibuf, ntohl(*hdrlen))) {
	375	zbuf_reset_head(ibuf, hdrlen);
	376	break;
	377	}
	378
	379	/* Handle packet */
996c9314 LB	380	zbuf_init(&pktbuf, hdrlen, htonl(*hdrlen) + 4,
996c9314 LB	381	htonl(*hdrlen) + 4);
2fb975da TT	382	vici_recv_message(vici, &pktbuf);
	383	} while (1);
	384
ffa2c898	385	thread_add_read(master, vici_read, vici, vici->fd, &vici->t_read);
2fb975da TT	386	}
2fb975da TT	387
cc9f21da	388	static void vici_write(struct thread *t)
2fb975da TT	389	{
	390	struct vici_conn *vici = THREAD_ARG(t);
	391	int r;
	392
2fb975da TT	393	r = zbufq_write(&vici->obuf, vici->fd);
2fb975da TT	394	if (r > 0) {
ffa2c898 QY	395	thread_add_write(master, vici_write, vici, vici->fd,
ffa2c898 QY	396	&vici->t_write);
2fb975da TT	397	} else if (r < 0) {
	398	vici_connection_error(vici);
	399	}
2fb975da TT	400	}
	401
	402	static void vici_submit(struct vici_conn vici, struct zbuf obuf)
	403	{
	404	if (vici->fd < 0) {
	405	zbuf_free(obuf);
	406	return;
	407	}
	408
	409	zbufq_queue(&vici->obuf, obuf);
ffa2c898	410	thread_add_write(master, vici_write, vici, vici->fd, &vici->t_write);
2fb975da TT	411	}
	412
	413	static void vici_submit_request(struct vici_conn vici, const char name, ...)
	414	{
	415	struct zbuf *obuf;
	416	uint32_t *hdrlen;
	417	va_list va;
	418	size_t len;
	419	int type;
	420
	421	obuf = zbuf_alloc(256);
996c9314 LB	422	if (!obuf)
996c9314 LB	423	return;
2fb975da TT	424
	425	hdrlen = zbuf_push(obuf, uint32_t);
	426	zbuf_put8(obuf, VICI_CMD_REQUEST);
	427	vici_zbuf_puts(obuf, name);
	428
	429	va_start(va, name);
	430	for (type = va_arg(va, int); type != VICI_END; type = va_arg(va, int)) {
	431	zbuf_put8(obuf, type);
	432	switch (type) {
	433	case VICI_KEY_VALUE:
	434	vici_zbuf_puts(obuf, va_arg(va, const char *));
	435	len = va_arg(va, size_t);
	436	zbuf_put_be16(obuf, len);
	437	zbuf_put(obuf, va_arg(va, void *), len);
	438	break;
2fb975da TT	439	default:
	440	break;
	441	}
	442	}
	443	va_end(va);
	444	*hdrlen = htonl(zbuf_used(obuf) - 4);
	445	vici_submit(vici, obuf);
	446	}
	447
	448	static void vici_register_event(struct vici_conn vici, const char name)
	449	{
	450	struct zbuf *obuf;
	451	uint32_t *hdrlen;
	452	uint8_t namelen;
	453
	454	namelen = strlen(name);
	455	obuf = zbuf_alloc(4 + 1 + 1 + namelen);
996c9314 LB	456	if (!obuf)
996c9314 LB	457	return;
2fb975da TT	458
	459	hdrlen = zbuf_push(obuf, uint32_t);
	460	zbuf_put8(obuf, VICI_EVENT_REGISTER);
	461	zbuf_put8(obuf, namelen);
	462	zbuf_put(obuf, name, namelen);
	463	*hdrlen = htonl(zbuf_used(obuf) - 4);
	464
	465	vici_submit(vici, obuf);
	466	}
	467
40307370 PG	468	static bool vici_charon_filepath_done;
	469	static bool vici_charon_not_found;
	470
	471	static char *vici_get_charon_filepath(void)
	472	{
	473	static char buff[1200];
	474	FILE *fp;
	475	char *ptr;
	476	char line[1024];
	477
	478	if (vici_charon_filepath_done)
	479	return (char *)buff;
	480	fp = popen("ipsec --piddir", "r");
	481	if (!fp) {
	482	if (!vici_charon_not_found) {
	483	flog_err(EC_NHRP_SWAN,
	484	"VICI: Failed to retrieve charon file path");
	485	vici_charon_not_found = true;
	486	}
	487	return NULL;
	488	}
	489	/* last line of output is used to get vici path */
	490	while (fgets(line, sizeof(line), fp) != NULL) {
	491	ptr = strchr(line, '\n');
	492	if (ptr)
	493	*ptr = '\0';
	494	snprintf(buff, sizeof(buff), "%s/charon.vici", line);
	495	}
	496	pclose(fp);
	497	vici_charon_filepath_done = true;
	498	return buff;
	499	}
	500
cc9f21da	501	static void vici_reconnect(struct thread *t)
2fb975da TT	502	{
	503	struct vici_conn *vici = THREAD_ARG(t);
	504	int fd;
40307370	505	char *file_path;
2fb975da	506
996c9314	507	if (vici->fd >= 0)
cc9f21da	508	return;
2fb975da	509
354196c0	510	fd = sock_open_unix(VICI_SOCKET);
40307370 PG	511	if (fd < 0) {
	512	file_path = vici_get_charon_filepath();
	513	if (file_path)
	514	fd = sock_open_unix(file_path);
	515	}
2fb975da	516	if (fd < 0) {
996c9314	517	debugf(NHRP_DEBUG_VICI,
15569c58 DA	518	"%s: failure connecting VICI socket: %s", __func__,
15569c58 DA	519	strerror(errno));
ffa2c898 QY	520	thread_add_timer(master, vici_reconnect, vici, 2,
ffa2c898 QY	521	&vici->t_reconnect);
cc9f21da	522	return;
2fb975da TT	523	}
	524
	525	debugf(NHRP_DEBUG_COMMON, "VICI: Connected");
	526	vici->fd = fd;
ffa2c898	527	thread_add_read(master, vici_read, vici, vici->fd, &vici->t_read);
2fb975da TT	528
2fb975da TT	529	/* Send event subscribtions */
996c9314 LB	530	// vici_register_event(vici, "child-updown");
996c9314 LB	531	// vici_register_event(vici, "child-rekey");
2fb975da TT	532	vici_register_event(vici, "child-state-installed");
	533	vici_register_event(vici, "child-state-rekeyed");
	534	vici_register_event(vici, "child-state-destroying");
	535	vici_register_event(vici, "list-sa");
	536	vici_submit_request(vici, "list-sas", VICI_END);
2fb975da TT	537	}
	538
	539	static struct vici_conn vici_connection;
	540
	541	void vici_init(void)
	542	{
	543	struct vici_conn *vici = &vici_connection;
	544
	545	vici->fd = -1;
	546	zbuf_init(&vici->ibuf, vici->ibuf_data, sizeof(vici->ibuf_data), 0);
	547	zbufq_init(&vici->obuf);
ffa2c898 QY	548	thread_add_timer_msec(master, vici_reconnect, vici, 10,
ffa2c898 QY	549	&vici->t_reconnect);
2fb975da TT	550	}
	551
	552	void vici_terminate(void)
	553	{
	554	}
	555
083bbfae GG	556	void vici_terminate_vc_by_profile_name(char *profile_name)
	557	{
	558	struct vici_conn *vici = &vici_connection;
74e5ba3a	559
58ef1668	560	debugf(NHRP_DEBUG_VICI, "Terminate profile = %s", profile_name);
083bbfae GG	561	vici_submit_request(vici, "terminate", VICI_KEY_VALUE, "ike",
	562	strlen(profile_name), profile_name, VICI_END);
	563	}
	564
	565	void vici_terminate_vc_by_ike_id(unsigned int ike_id)
4cbaf956 GG	566	{
4cbaf956 GG	567	struct vici_conn *vici = &vici_connection;
74e5ba3a RD	568	char ike_id_str[10];
74e5ba3a RD	569
4cbaf956	570	snprintf(ike_id_str, sizeof(ike_id_str), "%d", ike_id);
58ef1668	571	debugf(NHRP_DEBUG_VICI, "Terminate ike_id_str = %s", ike_id_str);
4cbaf956 GG	572	vici_submit_request(vici, "terminate", VICI_KEY_VALUE, "ike-id",
	573	strlen(ike_id_str), ike_id_str, VICI_END);
	574	}
	575
996c9314 LB	576	void vici_request_vc(const char profile, union sockunion src,
996c9314 LB	577	union sockunion *dst, int prio)
2fb975da TT	578	{
	579	struct vici_conn *vici = &vici_connection;
	580	char buf[2][SU_ADDRSTRLEN];
	581
0d6f7fd6 DA	582	sockunion2str(src, buf[0], sizeof(buf[0]));
0d6f7fd6 DA	583	sockunion2str(dst, buf[1], sizeof(buf[1]));
2fb975da	584
996c9314 LB	585	vici_submit_request(vici, "initiate", VICI_KEY_VALUE, "child",
	586	strlen(profile), profile, VICI_KEY_VALUE, "timeout",
	587	(size_t)2, "-1", VICI_KEY_VALUE, "async", (size_t)1,
	588	"1", VICI_KEY_VALUE, "init-limits", (size_t)1,
	589	prio ? "0" : "1", VICI_KEY_VALUE, "my-host",
	590	strlen(buf[0]), buf[0], VICI_KEY_VALUE,
	591	"other-host", strlen(buf[1]), buf[1], VICI_END);
2fb975da TT	592	}
	593
	594	int sock_open_unix(const char *path)
	595	{
	596	int ret, fd;
	597	struct sockaddr_un addr;
	598
	599	fd = socket(AF_UNIX, SOCK_STREAM, 0);
	600	if (fd < 0)
	601	return -1;
	602
6006b807	603	memset(&addr, 0, sizeof(addr));
2fb975da	604	addr.sun_family = AF_UNIX;
fa3bf3a2	605	strlcpy(addr.sun_path, path, sizeof(addr.sun_path));
2fb975da	606
996c9314 LB	607	ret = connect(fd, (struct sockaddr *)&addr,
996c9314 LB	608	sizeof(addr.sun_family) + strlen(addr.sun_path));
2fb975da TT	609	if (ret < 0) {
	610	close(fd);
	611	return -1;
	612	}
	613
6c8ca260 JB	614	ret = fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) \| O_NONBLOCK);
	615	if (ret < 0) {
	616	close(fd);
	617	return -1;
	618	}
2fb975da TT	619
	620	return fd;
	621	}