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master-service-haproxy.c
523 lines (460 loc) · 13.9 KB
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master-service-haproxy.c
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/* Copyright (c) 2013-2017 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "llist.h"
#include "ioloop.h"
#include "str-sanitize.h"
#include "master-service-private.h"
#include "master-service-settings.h"
#define HAPROXY_V1_MAX_HEADER_SIZE (108)
enum haproxy_version_t {
HAPROXY_VERSION_1,
HAPROXY_VERSION_2,
};
enum {
HAPROXY_CMD_LOCAL = 0x00,
HAPROXY_CMD_PROXY = 0x01
};
enum {
HAPROXY_AF_UNSPEC = 0x00,
HAPROXY_AF_INET = 0x01,
HAPROXY_AF_INET6 = 0x02,
HAPROXY_AF_UNIX = 0x03
};
enum {
HAPROXY_SOCK_UNSPEC = 0x00,
HAPROXY_SOCK_STREAM = 0x01,
HAPROXY_SOCK_DGRAM = 0x02
};
static const char haproxy_v2sig[12] =
"\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A";
struct haproxy_header_v2 {
uint8_t sig[12];
uint8_t ver_cmd;
uint8_t fam;
uint16_t len;
};
struct haproxy_data_v2 {
union {
struct { /* for TCP/UDP over IPv4, len = 12 */
uint32_t src_addr;
uint32_t dst_addr;
uint16_t src_port;
uint16_t dst_port;
} ip4;
struct { /* for TCP/UDP over IPv6, len = 36 */
uint8_t src_addr[16];
uint8_t dst_addr[16];
uint16_t src_port;
uint16_t dst_port;
} ip6;
struct { /* for AF_UNIX sockets, len = 216 */
uint8_t src_addr[108];
uint8_t dst_addr[108];
} unx;
} addr;
};
struct master_service_haproxy_conn {
struct master_service_connection conn;
struct master_service_haproxy_conn *prev, *next;
struct master_service *service;
struct io *io;
struct timeout *to;
};
static void
master_service_haproxy_conn_free(struct master_service_haproxy_conn *hpconn)
{
struct master_service *service = hpconn->service;
DLLIST_REMOVE(&service->haproxy_conns, hpconn);
io_remove(&hpconn->io);
timeout_remove(&hpconn->to);
i_free(hpconn);
}
static void
master_service_haproxy_conn_failure(struct master_service_haproxy_conn *hpconn)
{
struct master_service *service = hpconn->service;
struct master_service_connection conn = hpconn->conn;
master_service_haproxy_conn_free(hpconn);
master_service_client_connection_handled(service, &conn);
}
static void
master_service_haproxy_conn_success(struct master_service_haproxy_conn *hpconn)
{
struct master_service *service = hpconn->service;
struct master_service_connection conn = hpconn->conn;
master_service_haproxy_conn_free(hpconn);
master_service_client_connection_callback(service, &conn);
}
static void
master_service_haproxy_timeout(struct master_service_haproxy_conn *hpconn)
{
i_error("haproxy: Client timed out (rip=%s)",
net_ip2addr(&hpconn->conn.remote_ip));
master_service_haproxy_conn_failure(hpconn);
}
static ssize_t
master_service_haproxy_recv(int fd, void *buf, size_t len, int flags)
{
ssize_t ret;
do {
ret = recv(fd, buf, len, flags);
} while (ret < 0 && errno == EINTR);
if (ret < 0 && errno == EAGAIN)
return 0;
if (ret <= 0) {
if (ret == 0)
errno = ECONNRESET;
return -1;
}
return ret;
}
static int
master_service_haproxy_read(struct master_service_haproxy_conn *hpconn)
{
/* reasonable max size for haproxy data */
unsigned char rbuf[1500];
static union {
unsigned char v1_data[HAPROXY_V1_MAX_HEADER_SIZE];
struct {
const struct haproxy_header_v2 hdr;
const struct haproxy_data_v2 data;
} v2;
} buf;
struct ip_addr *real_remote_ip = &hpconn->conn.remote_ip;
int fd = hpconn->conn.fd;
struct ip_addr local_ip, remote_ip;
in_port_t local_port, remote_port;
size_t size,want;
ssize_t ret;
enum haproxy_version_t version;
/* the protocol specification explicitly states that the protocol header
must be sent as one TCP frame, meaning that we will get it in full
with the first recv() call.
*/
i_zero(&buf);
i_zero(rbuf);
/* see if there is a HAPROXY protocol command waiting */
if ((ret = master_service_haproxy_recv(fd, &buf, sizeof(buf), MSG_PEEK))<=0) {
if (ret < 0)
i_info("haproxy: Client disconnected (rip=%s): %m",
net_ip2addr(real_remote_ip));
return ret;
/* see if there is a haproxy command, 8 is used later on as well */
} else if (ret >= 8 && memcmp(buf.v1_data, "PROXY", 5) == 0) {
/* fine */
version = HAPROXY_VERSION_1;
} else if ((size_t)ret >= sizeof(buf.v2.hdr) &&
memcmp(buf.v2.hdr.sig, haproxy_v2sig, sizeof(haproxy_v2sig)) == 0) {
want = ntohs(buf.v2.hdr.len) + sizeof(buf.v2.hdr);
if (want > sizeof(rbuf)) {
i_error("haproxy: Client disconnected: Too long header (rip=%s)",
net_ip2addr(real_remote_ip));
return -1;
}
if ((ret = master_service_haproxy_recv(fd, rbuf, want, MSG_WAITALL))<=0) {
if (ret < 0)
i_info("haproxy: Client disconnected (rip=%s): %m",
net_ip2addr(real_remote_ip));
return ret;
}
if (ret != (ssize_t)want) {
i_info("haproxy: Client disconnected: Failed to read full header (rip=%s)",
net_ip2addr(real_remote_ip));
return -1;
}
memcpy(&buf, rbuf, sizeof(buf));
version = HAPROXY_VERSION_2;
} else {
/* it wasn't haproxy data */
i_error("haproxy: Client disconnected: "
"Failed to read valid HAproxy data (rip=%s)",
net_ip2addr(real_remote_ip));
return -1;
}
/* don't update true connection data until we succeed */
local_ip = hpconn->conn.local_ip;
remote_ip = hpconn->conn.remote_ip;
local_port = hpconn->conn.local_port;
remote_port = hpconn->conn.remote_port;
/* protocol version 2 */
if (version == HAPROXY_VERSION_2) {
const struct haproxy_header_v2 *hdr = &buf.v2.hdr;
const struct haproxy_data_v2 *data = &buf.v2.data;
size_t hdr_len;
i_assert(ret >= (ssize_t)sizeof(buf.v2.hdr));
if ((hdr->ver_cmd & 0xf0) != 0x20) {
i_error("haproxy: Client disconnected: "
"Unsupported protocol version (version=%02x, rip=%s)",
(hdr->ver_cmd & 0xf0) >> 4,
net_ip2addr(real_remote_ip));
return -1;
}
hdr_len = ntohs(hdr->len);
size = sizeof(*hdr) + hdr_len;
if (ret < (ssize_t)size) {
i_error("haproxy(v2): Client disconnected: "
"Protocol payload length does not match header "
"(got=%"PRIuSIZE_T", expect=%"PRIuSIZE_T", rip=%s)",
(size_t)ret, size, net_ip2addr(real_remote_ip));
return -1;
}
switch (hdr->ver_cmd & 0x0f) {
case HAPROXY_CMD_LOCAL:
/* keep local connection address for LOCAL */
/*i_debug("haproxy(v2): Local connection (rip=%s)",
net_ip2addr(real_remote_ip));*/
break;
case HAPROXY_CMD_PROXY:
if ((hdr->fam & 0x0f) != HAPROXY_SOCK_STREAM) {
/* UDP makes no sense currently */
i_error("haproxy(v2): Client disconnected: "
"Not using TCP (type=%02x, rip=%s)",
(hdr->fam & 0x0f), net_ip2addr(real_remote_ip));
return -1;
}
switch ((hdr->fam & 0xf0) >> 4) {
case HAPROXY_AF_INET:
/* IPv4 */
if (hdr_len < sizeof(data->addr.ip4)) {
i_error("haproxy(v2): Client disconnected: "
"IPv4 data is incomplete (rip=%s)",
net_ip2addr(real_remote_ip));
return -1;
}
local_ip.family = AF_INET;
local_ip.u.ip4.s_addr = data->addr.ip4.dst_addr;
local_port = ntohs(data->addr.ip4.dst_port);
remote_ip.family = AF_INET;
remote_ip.u.ip4.s_addr = data->addr.ip4.src_addr;
remote_port = ntohs(data->addr.ip4.src_port);
break;
case HAPROXY_AF_INET6:
/* IPv6 */
if (hdr_len < sizeof(data->addr.ip6)) {
i_error("haproxy(v2): Client disconnected: "
"IPv6 data is incomplete (rip=%s)",
net_ip2addr(real_remote_ip));
return -1;
}
local_ip.family = AF_INET6;
memcpy(&local_ip.u.ip6.s6_addr, data->addr.ip6.dst_addr, 16);
local_port = ntohs(data->addr.ip6.dst_port);
remote_ip.family = AF_INET6;
memcpy(&remote_ip.u.ip6.s6_addr, data->addr.ip6.src_addr, 16);
remote_port = ntohs(data->addr.ip6.src_port);
break;
case HAPROXY_AF_UNSPEC:
case HAPROXY_AF_UNIX:
/* unsupported; ignored */
i_error("haproxy(v2): Unsupported address family "
"(family=%02x, rip=%s)", (hdr->fam & 0xf0) >> 4,
net_ip2addr(real_remote_ip));
break;
default:
/* unsupported; error */
i_error("haproxy(v2): Client disconnected: "
"Unknown address family "
"(family=%02x, rip=%s)", (hdr->fam & 0xf0) >> 4,
net_ip2addr(real_remote_ip));
return -1;
}
break;
default:
i_error("haproxy(v2): Client disconnected: "
"Invalid command (cmd=%02x, rip=%s)",
(hdr->ver_cmd & 0x0f),
net_ip2addr(real_remote_ip));
return -1; /* not a supported command */
}
// FIXME: TLV vectors are ignored
// (useful to see whether proxied client is using SSL)
/* protocol version 1 (soon obsolete) */
} else if (version == HAPROXY_VERSION_1) {
unsigned char *data = buf.v1_data, *end;
const char *const *fields;
unsigned int family = 0;
i_assert(ret >= 8);
/* find end of header line */
end = memchr(data, '\r', ret - 1);
if (end == NULL || end[1] != '\n')
return -1;
*end = '\0';
size = end + 2 - data;
/* magic */
fields = t_strsplit((char *)data, " ");
i_assert(strcmp(*fields, "PROXY") == 0);
fields++;
/* protocol */
if (*fields == NULL) {
i_error("haproxy(v1): Client disconnected: "
"Field for proxied protocol is missing "
"(rip=%s)", net_ip2addr(real_remote_ip));
return -1;
}
if (strcmp(*fields, "TCP4") == 0) {
family = AF_INET;
} else if (strcmp(*fields, "TCP6") == 0) {
family = AF_INET6;
} else if (strcmp(*fields, "UNKNOWN") == 0) {
family = 0;
} else {
i_error("haproxy(v1): Client disconnected: "
"Unknown proxied protocol "
"(protocol=`%s', rip=%s)", str_sanitize(*fields, 64),
net_ip2addr(real_remote_ip));
return -1;
}
fields++;
if (family != 0) {
/* remote address */
if (*fields == NULL) {
i_error("haproxy(v1): Client disconnected: "
"Field for proxied remote address is missing "
"(rip=%s)", net_ip2addr(real_remote_ip));
return -1;
}
if (net_addr2ip(*fields, &remote_ip) < 0 ||
remote_ip.family != family) {
i_error("haproxy(v1): Client disconnected: "
"Proxied remote address is invalid "
"(address=`%s', rip=%s)", str_sanitize(*fields, 64),
net_ip2addr(real_remote_ip));
return -1;
}
fields++;
/* local address */
if (*fields == NULL) {
i_error("haproxy(v1): Client disconnected: "
"Field for proxied local address is missing "
"(rip=%s)", net_ip2addr(real_remote_ip));
return -1;
}
if (net_addr2ip(*fields, &local_ip) < 0 ||
local_ip.family != family) {
i_error("haproxy(v1): Client disconnected: "
"Proxied local address is invalid "
"(address=`%s', rip=%s)", str_sanitize(*fields, 64),
net_ip2addr(real_remote_ip));
return -1;
}
fields++;
/* remote port */
if (*fields == NULL) {
i_error("haproxy(v1): Client disconnected: "
"Field for proxied local port is missing "
"(rip=%s)", net_ip2addr(real_remote_ip));
return -1;
}
if (net_str2port(*fields, &remote_port) < 0) {
i_error("haproxy(v1): Client disconnected: "
"Proxied remote port is invalid "
"(port=`%s', rip=%s)", str_sanitize(*fields, 64),
net_ip2addr(real_remote_ip));
return -1;
}
fields++;
/* local port */
if (*fields == NULL) {
i_error("haproxy(v1): Client disconnected: "
"Field for proxied local port is missing "
"(rip=%s)", net_ip2addr(real_remote_ip));
return -1;
}
if (net_str2port(*fields, &local_port) < 0) {
i_error("haproxy(v1): Client disconnected: "
"Proxied local port is invalid "
"(port=`%s', rip=%s)", str_sanitize(*fields, 64),
net_ip2addr(real_remote_ip));
return -1;
}
fields++;
if (*fields != NULL) {
i_error("haproxy(v1): Client disconnected: "
"Header line has spurius extra field "
"(field=`%s', rip=%s)", str_sanitize(*fields, 64),
net_ip2addr(real_remote_ip));
return -1;
}
}
i_assert(size <= sizeof(buf));
if ((ret = master_service_haproxy_recv(fd, &buf, size, 0))<=0) {
if (ret < 0)
i_info("haproxy: Client disconnected (rip=%s): %m",
net_ip2addr(real_remote_ip));
return ret;
} else if (ret != (ssize_t)size) {
i_error("haproxy: Client disconnected: "
"Failed to read full header (rip=%s)",
net_ip2addr(real_remote_ip));
return -1;
}
/* invalid protocol */
} else {
i_unreached();
}
/* assign data from proxy */
hpconn->conn.local_ip = local_ip;
hpconn->conn.remote_ip = remote_ip;
hpconn->conn.local_port = local_port;
hpconn->conn.remote_port = remote_port;
return 1;
}
static void
master_service_haproxy_input(struct master_service_haproxy_conn *hpconn)
{
int ret;
if ((ret = master_service_haproxy_read(hpconn)) <= 0) {
if (ret < 0)
master_service_haproxy_conn_failure(hpconn);
} else {
master_service_haproxy_conn_success(hpconn);
}
}
static bool
master_service_haproxy_conn_is_trusted(struct master_service *service,
struct master_service_connection *conn)
{
const char *const *net;
struct ip_addr net_ip;
unsigned int bits;
if (service->set->haproxy_trusted_networks == NULL)
return FALSE;
net = t_strsplit_spaces(service->set->haproxy_trusted_networks, ", ");
for (; *net != NULL; net++) {
if (net_parse_range(*net, &net_ip, &bits) < 0) {
i_error("haproxy_trusted_networks: "
"Invalid network '%s'", *net);
break;
}
if (net_is_in_network(&conn->real_remote_ip, &net_ip, bits))
return TRUE;
}
return FALSE;
}
void master_service_haproxy_new(struct master_service *service,
struct master_service_connection *conn)
{
struct master_service_haproxy_conn *hpconn;
if (!master_service_haproxy_conn_is_trusted(service, conn)) {
i_warning("haproxy: Client not trusted (rip=%s)",
net_ip2addr(&conn->real_remote_ip));
master_service_client_connection_handled(service, conn);
return;
}
hpconn = i_new(struct master_service_haproxy_conn, 1);
hpconn->conn = *conn;
hpconn->service = service;
DLLIST_PREPEND(&service->haproxy_conns, hpconn);
hpconn->io = io_add(conn->fd, IO_READ,
master_service_haproxy_input, hpconn);
hpconn->to = timeout_add(service->set->haproxy_timeout*1000,
master_service_haproxy_timeout, hpconn);
}
void master_service_haproxy_abort(struct master_service *service)
{
while (service->haproxy_conns != NULL) {
int fd = service->haproxy_conns->conn.fd;
master_service_haproxy_conn_free(service->haproxy_conns);
i_close_fd(&fd);
}
}