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payload.c
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payload.c
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/*
* General protocol-agnostic payload-based sample fetches and ACLs
*
* Copyright 2000-2013 Willy Tarreau <[email protected]>
*
* This program is free software; you can redistribute it 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.
*
*/
#include <stdlib.h>
#include <string.h>
#include <haproxy/acl.h>
#include <haproxy/api.h>
#include <haproxy/arg.h>
#include <haproxy/channel.h>
#include <haproxy/connection.h>
#include <haproxy/htx.h>
#include <haproxy/net_helper.h>
#include <haproxy/pattern.h>
#include <haproxy/payload.h>
#include <haproxy/sample.h>
/************************************************************************/
/* All supported sample fetch functions must be declared here */
/************************************************************************/
/* wait for more data as long as possible, then return TRUE. This should be
* used with content inspection.
*/
static int
smp_fetch_wait_end(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
if (!(smp->opt & SMP_OPT_FINAL)) {
smp->flags |= SMP_F_MAY_CHANGE;
return 0;
}
smp->data.type = SMP_T_BOOL;
smp->data.u.sint = 1;
return 1;
}
/* return the number of bytes in the request buffer */
static int
smp_fetch_len(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
if (smp->strm) {
struct channel *chn = ((smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES) ? &smp->strm->res : &smp->strm->req;
if (IS_HTX_STRM(smp->strm)) {
struct htx *htx = htxbuf(&chn->buf);
smp->data.u.sint = htx->data - co_data(chn);
}
else
smp->data.u.sint = ci_data(chn);
}
else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK) {
struct check *check = __objt_check(smp->sess->origin);
smp->data.u.sint = ((check->cs && IS_HTX_CS(check->cs)) ? (htxbuf(&check->bi))->data: b_data(&check->bi));
}
else
return 0;
smp->data.type = SMP_T_SINT;
smp->flags = SMP_F_VOLATILE | SMP_F_MAY_CHANGE;
return 1;
}
/* Returns 0 if the client didn't send a SessionTicket Extension
* Returns 1 if the client sent SessionTicket Extension
* Returns 2 if the client also sent non-zero length SessionTicket
* Returns SMP_T_SINT data type
*/
static int
smp_fetch_req_ssl_st_ext(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
int hs_len, ext_len, bleft;
struct channel *chn;
unsigned char *data;
if (!smp->strm)
goto not_ssl_hello;
chn = ((smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES) ? &smp->strm->res : &smp->strm->req;
bleft = ci_data(chn);
data = (unsigned char *)ci_head(chn);
/* Check for SSL/TLS Handshake */
if (!bleft)
goto too_short;
if (*data != 0x16)
goto not_ssl_hello;
/* Check for SSLv3 or later (SSL version >= 3.0) in the record layer*/
if (bleft < 3)
goto too_short;
if (data[1] < 0x03)
goto not_ssl_hello;
if (bleft < 5)
goto too_short;
hs_len = (data[3] << 8) + data[4];
if (hs_len < 1 + 3 + 2 + 32 + 1 + 2 + 2 + 1 + 1 + 2 + 2)
goto not_ssl_hello; /* too short to have an extension */
data += 5; /* enter TLS handshake */
bleft -= 5;
/* Check for a complete client hello starting at <data> */
if (bleft < 1)
goto too_short;
if (data[0] != 0x01) /* msg_type = Client Hello */
goto not_ssl_hello;
/* Check the Hello's length */
if (bleft < 4)
goto too_short;
hs_len = (data[1] << 16) + (data[2] << 8) + data[3];
if (hs_len < 2 + 32 + 1 + 2 + 2 + 1 + 1 + 2 + 2)
goto not_ssl_hello; /* too short to have an extension */
/* We want the full handshake here */
if (bleft < hs_len)
goto too_short;
data += 4;
/* Start of the ClientHello message */
if (data[0] < 0x03 || data[1] < 0x01) /* TLSv1 minimum */
goto not_ssl_hello;
ext_len = data[34]; /* session_id_len */
if (ext_len > 32 || ext_len > (hs_len - 35)) /* check for correct session_id len */
goto not_ssl_hello;
/* Jump to cipher suite */
hs_len -= 35 + ext_len;
data += 35 + ext_len;
if (hs_len < 4 || /* minimum one cipher */
(ext_len = (data[0] << 8) + data[1]) < 2 || /* minimum 2 bytes for a cipher */
ext_len > hs_len)
goto not_ssl_hello;
/* Jump to the compression methods */
hs_len -= 2 + ext_len;
data += 2 + ext_len;
if (hs_len < 2 || /* minimum one compression method */
data[0] < 1 || data[0] > hs_len) /* minimum 1 bytes for a method */
goto not_ssl_hello;
/* Jump to the extensions */
hs_len -= 1 + data[0];
data += 1 + data[0];
if (hs_len < 2 || /* minimum one extension list length */
(ext_len = (data[0] << 8) + data[1]) > hs_len - 2) /* list too long */
goto not_ssl_hello;
hs_len = ext_len; /* limit ourselves to the extension length */
data += 2;
while (hs_len >= 4) {
int ext_type, ext_len;
ext_type = (data[0] << 8) + data[1];
ext_len = (data[2] << 8) + data[3];
if (ext_len > hs_len - 4) /* Extension too long */
goto not_ssl_hello;
/* SesstionTicket extension */
if (ext_type == 35) {
smp->data.type = SMP_T_SINT;
/* SessionTicket also present */
if (ext_len > 0)
smp->data.u.sint = 2;
/* SessionTicket absent */
else
smp->data.u.sint = 1;
smp->flags = SMP_F_VOLATILE;
return 1;
}
hs_len -= 4 + ext_len;
data += 4 + ext_len;
}
/* SessionTicket Extension not found */
smp->data.type = SMP_T_SINT;
smp->data.u.sint = 0;
smp->flags = SMP_F_VOLATILE;
return 1;
too_short:
smp->flags = SMP_F_MAY_CHANGE;
not_ssl_hello:
return 0;
}
/* Returns TRUE if the client sent Supported Elliptic Curves Extension (0x000a)
* Mainly used to detect if client supports ECC cipher suites.
*/
static int
smp_fetch_req_ssl_ec_ext(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
int hs_len, ext_len, bleft;
struct channel *chn;
unsigned char *data;
if (!smp->strm)
goto not_ssl_hello;
chn = ((smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES) ? &smp->strm->res : &smp->strm->req;
bleft = ci_data(chn);
data = (unsigned char *)ci_head(chn);
/* Check for SSL/TLS Handshake */
if (!bleft)
goto too_short;
if (*data != 0x16)
goto not_ssl_hello;
/* Check for SSLv3 or later (SSL version >= 3.0) in the record layer*/
if (bleft < 3)
goto too_short;
if (data[1] < 0x03)
goto not_ssl_hello;
if (bleft < 5)
goto too_short;
hs_len = (data[3] << 8) + data[4];
if (hs_len < 1 + 3 + 2 + 32 + 1 + 2 + 2 + 1 + 1 + 2 + 2)
goto not_ssl_hello; /* too short to have an extension */
data += 5; /* enter TLS handshake */
bleft -= 5;
/* Check for a complete client hello starting at <data> */
if (bleft < 1)
goto too_short;
if (data[0] != 0x01) /* msg_type = Client Hello */
goto not_ssl_hello;
/* Check the Hello's length */
if (bleft < 4)
goto too_short;
hs_len = (data[1] << 16) + (data[2] << 8) + data[3];
if (hs_len < 2 + 32 + 1 + 2 + 2 + 1 + 1 + 2 + 2)
goto not_ssl_hello; /* too short to have an extension */
/* We want the full handshake here */
if (bleft < hs_len)
goto too_short;
data += 4;
/* Start of the ClientHello message */
if (data[0] < 0x03 || data[1] < 0x01) /* TLSv1 minimum */
goto not_ssl_hello;
ext_len = data[34]; /* session_id_len */
if (ext_len > 32 || ext_len > (hs_len - 35)) /* check for correct session_id len */
goto not_ssl_hello;
/* Jump to cipher suite */
hs_len -= 35 + ext_len;
data += 35 + ext_len;
if (hs_len < 4 || /* minimum one cipher */
(ext_len = (data[0] << 8) + data[1]) < 2 || /* minimum 2 bytes for a cipher */
ext_len > hs_len)
goto not_ssl_hello;
/* Jump to the compression methods */
hs_len -= 2 + ext_len;
data += 2 + ext_len;
if (hs_len < 2 || /* minimum one compression method */
data[0] < 1 || data[0] > hs_len) /* minimum 1 bytes for a method */
goto not_ssl_hello;
/* Jump to the extensions */
hs_len -= 1 + data[0];
data += 1 + data[0];
if (hs_len < 2 || /* minimum one extension list length */
(ext_len = (data[0] << 8) + data[1]) > hs_len - 2) /* list too long */
goto not_ssl_hello;
hs_len = ext_len; /* limit ourselves to the extension length */
data += 2;
while (hs_len >= 4) {
int ext_type, ext_len;
ext_type = (data[0] << 8) + data[1];
ext_len = (data[2] << 8) + data[3];
if (ext_len > hs_len - 4) /* Extension too long */
goto not_ssl_hello;
/* Elliptic curves extension */
if (ext_type == 10) {
smp->data.type = SMP_T_BOOL;
smp->data.u.sint = 1;
smp->flags = SMP_F_VOLATILE;
return 1;
}
hs_len -= 4 + ext_len;
data += 4 + ext_len;
}
/* server name not found */
goto not_ssl_hello;
too_short:
smp->flags = SMP_F_MAY_CHANGE;
not_ssl_hello:
return 0;
}
/* returns the type of SSL hello message (mainly used to detect an SSL hello) */
static int
smp_fetch_ssl_hello_type(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
int hs_len;
int hs_type, bleft;
struct channel *chn;
const unsigned char *data;
if (!smp->strm)
goto not_ssl_hello;
chn = ((smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES) ? &smp->strm->res : &smp->strm->req;
bleft = ci_data(chn);
data = (const unsigned char *)ci_head(chn);
if (!bleft)
goto too_short;
if ((*data >= 0x14 && *data <= 0x17) || (*data == 0xFF)) {
/* SSLv3 header format */
if (bleft < 9)
goto too_short;
/* ssl version 3 */
if ((data[1] << 16) + data[2] < 0x00030000)
goto not_ssl_hello;
/* ssl message len must present handshake type and len */
if ((data[3] << 8) + data[4] < 4)
goto not_ssl_hello;
/* format introduced with SSLv3 */
hs_type = (int)data[5];
hs_len = ( data[6] << 16 ) + ( data[7] << 8 ) + data[8];
/* not a full handshake */
if (bleft < (9 + hs_len))
goto too_short;
}
else {
goto not_ssl_hello;
}
smp->data.type = SMP_T_SINT;
smp->data.u.sint = hs_type;
smp->flags = SMP_F_VOLATILE;
return 1;
too_short:
smp->flags = SMP_F_MAY_CHANGE;
not_ssl_hello:
return 0;
}
/* Return the version of the SSL protocol in the request. It supports both
* SSLv3 (TLSv1) header format for any message, and SSLv2 header format for
* the hello message. The SSLv3 format is described in RFC 2246 p49, and the
* SSLv2 format is described here, and completed p67 of RFC 2246 :
* http://wp.netscape.com/eng/security/SSL_2.html
*
* Note: this decoder only works with non-wrapping data.
*/
static int
smp_fetch_req_ssl_ver(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
int version, bleft, msg_len;
const unsigned char *data;
struct channel *req;
if (!smp->strm)
return 0;
req = &smp->strm->req;
msg_len = 0;
bleft = ci_data(req);
if (!bleft)
goto too_short;
data = (const unsigned char *)ci_head(req);
if ((*data >= 0x14 && *data <= 0x17) || (*data == 0xFF)) {
/* SSLv3 header format */
if (bleft < 11)
goto too_short;
version = (data[1] << 16) + data[2]; /* record layer version: major, minor */
msg_len = (data[3] << 8) + data[4]; /* record length */
/* format introduced with SSLv3 */
if (version < 0x00030000)
goto not_ssl;
/* message length between 6 and 2^14 + 2048 */
if (msg_len < 6 || msg_len > ((1<<14) + 2048))
goto not_ssl;
bleft -= 5; data += 5;
/* return the client hello client version, not the record layer version */
version = (data[4] << 16) + data[5]; /* client hello version: major, minor */
} else {
/* SSLv2 header format, only supported for hello (msg type 1) */
int rlen, plen, cilen, silen, chlen;
if (*data & 0x80) {
if (bleft < 3)
goto too_short;
/* short header format : 15 bits for length */
rlen = ((data[0] & 0x7F) << 8) | data[1];
plen = 0;
bleft -= 2; data += 2;
} else {
if (bleft < 4)
goto too_short;
/* long header format : 14 bits for length + pad length */
rlen = ((data[0] & 0x3F) << 8) | data[1];
plen = data[2];
bleft -= 3; data += 3;
}
if (*data != 0x01)
goto not_ssl;
bleft--; data++;
if (bleft < 8)
goto too_short;
version = (data[0] << 16) + data[1]; /* version: major, minor */
cilen = (data[2] << 8) + data[3]; /* cipher len, multiple of 3 */
silen = (data[4] << 8) + data[5]; /* session_id_len: 0 or 16 */
chlen = (data[6] << 8) + data[7]; /* 16<=challenge length<=32 */
bleft -= 8; data += 8;
if (cilen % 3 != 0)
goto not_ssl;
if (silen && silen != 16)
goto not_ssl;
if (chlen < 16 || chlen > 32)
goto not_ssl;
if (rlen != 9 + cilen + silen + chlen)
goto not_ssl;
/* focus on the remaining data length */
msg_len = cilen + silen + chlen + plen;
}
/* We could recursively check that the buffer ends exactly on an SSL
* fragment boundary and that a possible next segment is still SSL,
* but that's a bit pointless. However, we could still check that
* all the part of the request which fits in a buffer is already
* there.
*/
if (msg_len > channel_recv_limit(req) + b_orig(&req->buf) - ci_head(req))
msg_len = channel_recv_limit(req) + b_orig(&req->buf) - ci_head(req);
if (bleft < msg_len)
goto too_short;
/* OK that's enough. We have at least the whole message, and we have
* the protocol version.
*/
smp->data.type = SMP_T_SINT;
smp->data.u.sint = version;
smp->flags = SMP_F_VOLATILE;
return 1;
too_short:
smp->flags = SMP_F_MAY_CHANGE;
not_ssl:
return 0;
}
/* Try to extract the Server Name Indication that may be presented in a TLS
* client hello handshake message. The format of the message is the following
* (cf RFC5246 + RFC6066) :
* TLS frame :
* - uint8 type = 0x16 (Handshake)
* - uint16 version >= 0x0301 (TLSv1)
* - uint16 length (frame length)
* - TLS handshake :
* - uint8 msg_type = 0x01 (ClientHello)
* - uint24 length (handshake message length)
* - ClientHello :
* - uint16 client_version >= 0x0301 (TLSv1)
* - uint8 Random[32] (4 first ones are timestamp)
* - SessionID :
* - uint8 session_id_len (0..32) (SessionID len in bytes)
* - uint8 session_id[session_id_len]
* - CipherSuite :
* - uint16 cipher_len >= 2 (Cipher length in bytes)
* - uint16 ciphers[cipher_len/2]
* - CompressionMethod :
* - uint8 compression_len >= 1 (# of supported methods)
* - uint8 compression_methods[compression_len]
* - optional client_extension_len (in bytes)
* - optional sequence of ClientHelloExtensions (as many bytes as above):
* - uint16 extension_type = 0 for server_name
* - uint16 extension_len
* - opaque extension_data[extension_len]
* - uint16 server_name_list_len (# of bytes here)
* - opaque server_names[server_name_list_len bytes]
* - uint8 name_type = 0 for host_name
* - uint16 name_len
* - opaque hostname[name_len bytes]
*/
static int
smp_fetch_ssl_hello_sni(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
int hs_len, ext_len, bleft;
struct channel *chn;
unsigned char *data;
if (!smp->strm)
goto not_ssl_hello;
chn = ((smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES) ? &smp->strm->res : &smp->strm->req;
bleft = ci_data(chn);
data = (unsigned char *)ci_head(chn);
/* Check for SSL/TLS Handshake */
if (!bleft)
goto too_short;
if (*data != 0x16)
goto not_ssl_hello;
/* Check for SSLv3 or later (SSL version >= 3.0) in the record layer*/
if (bleft < 3)
goto too_short;
if (data[1] < 0x03)
goto not_ssl_hello;
if (bleft < 5)
goto too_short;
hs_len = (data[3] << 8) + data[4];
if (hs_len < 1 + 3 + 2 + 32 + 1 + 2 + 2 + 1 + 1 + 2 + 2)
goto not_ssl_hello; /* too short to have an extension */
data += 5; /* enter TLS handshake */
bleft -= 5;
/* Check for a complete client hello starting at <data> */
if (bleft < 1)
goto too_short;
if (data[0] != 0x01) /* msg_type = Client Hello */
goto not_ssl_hello;
/* Check the Hello's length */
if (bleft < 4)
goto too_short;
hs_len = (data[1] << 16) + (data[2] << 8) + data[3];
if (hs_len < 2 + 32 + 1 + 2 + 2 + 1 + 1 + 2 + 2)
goto not_ssl_hello; /* too short to have an extension */
/* We want the full handshake here */
if (bleft < hs_len)
goto too_short;
data += 4;
/* Start of the ClientHello message */
if (data[0] < 0x03 || data[1] < 0x01) /* TLSv1 minimum */
goto not_ssl_hello;
ext_len = data[34]; /* session_id_len */
if (ext_len > 32 || ext_len > (hs_len - 35)) /* check for correct session_id len */
goto not_ssl_hello;
/* Jump to cipher suite */
hs_len -= 35 + ext_len;
data += 35 + ext_len;
if (hs_len < 4 || /* minimum one cipher */
(ext_len = (data[0] << 8) + data[1]) < 2 || /* minimum 2 bytes for a cipher */
ext_len > hs_len)
goto not_ssl_hello;
/* Jump to the compression methods */
hs_len -= 2 + ext_len;
data += 2 + ext_len;
if (hs_len < 2 || /* minimum one compression method */
data[0] < 1 || data[0] > hs_len) /* minimum 1 bytes for a method */
goto not_ssl_hello;
/* Jump to the extensions */
hs_len -= 1 + data[0];
data += 1 + data[0];
if (hs_len < 2 || /* minimum one extension list length */
(ext_len = (data[0] << 8) + data[1]) > hs_len - 2) /* list too long */
goto not_ssl_hello;
hs_len = ext_len; /* limit ourselves to the extension length */
data += 2;
while (hs_len >= 4) {
int ext_type, name_type, srv_len, name_len;
ext_type = (data[0] << 8) + data[1];
ext_len = (data[2] << 8) + data[3];
if (ext_len > hs_len - 4) /* Extension too long */
goto not_ssl_hello;
if (ext_type == 0) { /* Server name */
if (ext_len < 2) /* need one list length */
goto not_ssl_hello;
srv_len = (data[4] << 8) + data[5];
if (srv_len < 4 || srv_len > hs_len - 6)
goto not_ssl_hello; /* at least 4 bytes per server name */
name_type = data[6];
name_len = (data[7] << 8) + data[8];
if (name_type == 0) { /* hostname */
smp->data.type = SMP_T_STR;
smp->data.u.str.area = (char *)data + 9;
smp->data.u.str.data = name_len;
smp->flags = SMP_F_VOLATILE | SMP_F_CONST;
return 1;
}
}
hs_len -= 4 + ext_len;
data += 4 + ext_len;
}
/* server name not found */
goto not_ssl_hello;
too_short:
smp->flags = SMP_F_MAY_CHANGE;
not_ssl_hello:
return 0;
}
/* Try to extract the Application-Layer Protocol Negotiation (ALPN) protocol
* names that may be presented in a TLS client hello handshake message. As the
* message presents a list of protocol names in descending order of preference,
* it may return iteratively. The format of the message is the following
* (cf RFC5246 + RFC7301) :
* TLS frame :
* - uint8 type = 0x16 (Handshake)
* - uint16 version >= 0x0301 (TLSv1)
* - uint16 length (frame length)
* - TLS handshake :
* - uint8 msg_type = 0x01 (ClientHello)
* - uint24 length (handshake message length)
* - ClientHello :
* - uint16 client_version >= 0x0301 (TLSv1)
* - uint8 Random[32] (4 first ones are timestamp)
* - SessionID :
* - uint8 session_id_len (0..32) (SessionID len in bytes)
* - uint8 session_id[session_id_len]
* - CipherSuite :
* - uint16 cipher_len >= 2 (Cipher length in bytes)
* - uint16 ciphers[cipher_len/2]
* - CompressionMethod :
* - uint8 compression_len >= 1 (# of supported methods)
* - uint8 compression_methods[compression_len]
* - optional client_extension_len (in bytes)
* - optional sequence of ClientHelloExtensions (as many bytes as above):
* - uint16 extension_type = 16 for application_layer_protocol_negotiation
* - uint16 extension_len
* - opaque extension_data[extension_len]
* - uint16 protocol_names_len (# of bytes here)
* - opaque protocol_names[protocol_names_len bytes]
* - uint8 name_len
* - opaque protocol_name[name_len bytes]
*/
static int
smp_fetch_ssl_hello_alpn(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
int hs_len, ext_len, bleft;
struct channel *chn;
unsigned char *data;
if (!smp->strm)
goto not_ssl_hello;
chn = ((smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES) ? &smp->strm->res : &smp->strm->req;
bleft = ci_data(chn);
data = (unsigned char *)ci_head(chn);
/* Check for SSL/TLS Handshake */
if (!bleft)
goto too_short;
if (*data != 0x16)
goto not_ssl_hello;
/* Check for SSLv3 or later (SSL version >= 3.0) in the record layer*/
if (bleft < 3)
goto too_short;
if (data[1] < 0x03)
goto not_ssl_hello;
if (bleft < 5)
goto too_short;
hs_len = (data[3] << 8) + data[4];
if (hs_len < 1 + 3 + 2 + 32 + 1 + 2 + 2 + 1 + 1 + 2 + 2)
goto not_ssl_hello; /* too short to have an extension */
data += 5; /* enter TLS handshake */
bleft -= 5;
/* Check for a complete client hello starting at <data> */
if (bleft < 1)
goto too_short;
if (data[0] != 0x01) /* msg_type = Client Hello */
goto not_ssl_hello;
/* Check the Hello's length */
if (bleft < 4)
goto too_short;
hs_len = (data[1] << 16) + (data[2] << 8) + data[3];
if (hs_len < 2 + 32 + 1 + 2 + 2 + 1 + 1 + 2 + 2)
goto not_ssl_hello; /* too short to have an extension */
/* We want the full handshake here */
if (bleft < hs_len)
goto too_short;
data += 4;
/* Start of the ClientHello message */
if (data[0] < 0x03 || data[1] < 0x01) /* TLSv1 minimum */
goto not_ssl_hello;
ext_len = data[34]; /* session_id_len */
if (ext_len > 32 || ext_len > (hs_len - 35)) /* check for correct session_id len */
goto not_ssl_hello;
/* Jump to cipher suite */
hs_len -= 35 + ext_len;
data += 35 + ext_len;
if (hs_len < 4 || /* minimum one cipher */
(ext_len = (data[0] << 8) + data[1]) < 2 || /* minimum 2 bytes for a cipher */
ext_len > hs_len)
goto not_ssl_hello;
/* Jump to the compression methods */
hs_len -= 2 + ext_len;
data += 2 + ext_len;
if (hs_len < 2 || /* minimum one compression method */
data[0] < 1 || data[0] > hs_len) /* minimum 1 bytes for a method */
goto not_ssl_hello;
/* Jump to the extensions */
hs_len -= 1 + data[0];
data += 1 + data[0];
if (hs_len < 2 || /* minimum one extension list length */
(ext_len = (data[0] << 8) + data[1]) > hs_len - 2) /* list too long */
goto not_ssl_hello;
hs_len = ext_len; /* limit ourselves to the extension length */
data += 2;
while (hs_len >= 4) {
int ext_type, name_len, name_offset;
ext_type = (data[0] << 8) + data[1];
ext_len = (data[2] << 8) + data[3];
if (ext_len > hs_len - 4) /* Extension too long */
goto not_ssl_hello;
if (ext_type == 16) { /* ALPN */
if (ext_len < 3) /* one list length [uint16] + at least one name length [uint8] */
goto not_ssl_hello;
/* Name cursor in ctx, must begin after protocol_names_len */
name_offset = smp->ctx.i < 6 ? 6 : smp->ctx.i;
name_len = data[name_offset];
if (name_len + name_offset - 3 > ext_len)
goto not_ssl_hello;
smp->data.type = SMP_T_STR;
smp->data.u.str.area = (char *)data + name_offset + 1; /* +1 to skip name_len */
smp->data.u.str.data = name_len;
smp->flags = SMP_F_VOLATILE | SMP_F_CONST;
/* May have more protocol names remaining */
if (name_len + name_offset - 3 < ext_len) {
smp->ctx.i = name_offset + name_len + 1;
smp->flags |= SMP_F_NOT_LAST;
}
return 1;
}
hs_len -= 4 + ext_len;
data += 4 + ext_len;
}
/* alpn not found */
goto not_ssl_hello;
too_short:
smp->flags = SMP_F_MAY_CHANGE;
not_ssl_hello:
return 0;
}
/* Fetch the request RDP cookie identified in <cname>:<clen>, or any cookie if
* <clen> is empty (cname is then ignored). It returns the data into sample <smp>
* of type SMP_T_CSTR. Note: this decoder only works with non-wrapping data.
*/
int
fetch_rdp_cookie_name(struct stream *s, struct sample *smp, const char *cname, int clen)
{
int bleft;
const unsigned char *data;
smp->flags = SMP_F_CONST;
smp->data.type = SMP_T_STR;
bleft = ci_data(&s->req);
if (bleft <= 11)
goto too_short;
data = (const unsigned char *)ci_head(&s->req) + 11;
bleft -= 11;
if (bleft <= 7)
goto too_short;
if (strncasecmp((const char *)data, "Cookie:", 7) != 0)
goto not_cookie;
data += 7;
bleft -= 7;
while (bleft > 0 && *data == ' ') {
data++;
bleft--;
}
if (clen) {
if (bleft <= clen)
goto too_short;
if ((data[clen] != '=') ||
strncasecmp(cname, (const char *)data, clen) != 0)
goto not_cookie;
data += clen + 1;
bleft -= clen + 1;
} else {
while (bleft > 0 && *data != '=') {
if (*data == '\r' || *data == '\n')
goto not_cookie;
data++;
bleft--;
}
if (bleft < 1)
goto too_short;
if (*data != '=')
goto not_cookie;
data++;
bleft--;
}
/* data points to cookie value */
smp->data.u.str.area = (char *)data;
smp->data.u.str.data = 0;
while (bleft > 0 && *data != '\r') {
data++;
bleft--;
}
if (bleft < 2)
goto too_short;
if (data[0] != '\r' || data[1] != '\n')
goto not_cookie;
smp->data.u.str.data = (char *)data - smp->data.u.str.area;
smp->flags = SMP_F_VOLATILE | SMP_F_CONST;
return 1;
too_short:
smp->flags = SMP_F_MAY_CHANGE | SMP_F_CONST;
not_cookie:
return 0;
}
/* Fetch the request RDP cookie identified in the args, or any cookie if no arg
* is passed. It is usable both for ACL and for samples. Note: this decoder
* only works with non-wrapping data. Accepts either 0 or 1 argument. Argument
* is a string (cookie name), other types will lead to undefined behaviour. The
* returned sample has type SMP_T_CSTR.
*/
int
smp_fetch_rdp_cookie(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
if (!smp->strm)
return 0;
return fetch_rdp_cookie_name(smp->strm, smp,
args ? args->data.str.area : NULL,
args ? args->data.str.data : 0);
}
/* returns either 1 or 0 depending on whether an RDP cookie is found or not */
static int
smp_fetch_rdp_cookie_cnt(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
int ret;
ret = smp_fetch_rdp_cookie(args, smp, kw, private);
if (smp->flags & SMP_F_MAY_CHANGE)
return 0;
smp->flags = SMP_F_VOLATILE;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = ret;
return 1;
}
/* extracts part of a payload with offset and length at a given position */
static int
smp_fetch_payload_lv(const struct arg *arg_p, struct sample *smp, const char *kw, void *private)
{
unsigned int len_offset = arg_p[0].data.sint;
unsigned int len_size = arg_p[1].data.sint;
unsigned int buf_offset;
unsigned int buf_size = 0;
struct channel *chn = NULL;
char *head = NULL;
size_t max, data;
int i;
/* Format is (len offset, len size, buf offset) or (len offset, len size) */
/* by default buf offset == len offset + len size */
/* buf offset could be absolute or relative to len offset + len size if prefixed by + or - */
if (smp->strm) {
chn = ((smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES) ? &smp->strm->res : &smp->strm->req;
head = ci_head(chn);
data = ci_data(chn);
}
else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK) {
struct buffer *buf = &(__objt_check(smp->sess->origin)->bi);
head = b_head(buf);
data = b_data(buf);
}
max = global.tune.bufsize;
if (!head)
return 0;
if (len_offset + len_size > data)
goto too_short;
for (i = 0; i < len_size; i++) {
buf_size = (buf_size << 8) + ((unsigned char *)head)[i + len_offset];
}
/* buf offset may be implicit, absolute or relative. If the LSB
* is set, then the offset is relative otherwise it is absolute.
*/
buf_offset = len_offset + len_size;
if (arg_p[2].type == ARGT_SINT) {