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hydra-rdp.c
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/*
david: this module is heavily based on rdesktop v 1.7.0
rdesktop: A Remote Desktop Protocol client.
Protocol services - RDP layer
Copyright (C) Matthew Chapman <matthewc.unsw.edu.au> 1999-2008
Copyright 2003-2011 Peter Astrand <[email protected]> for Cendio AB
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 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
note:
this module was tested on w2k, xp, w2k3, w2k8
in terminal services configuration, in rdp-tcp properties
in Logon Settings tab, if 'Always prompt for password' is checked,
the password can't be passed interactively so there is no way
to test the credential (unless manually).
it's advised to lower the number of parallel tasks as RDP server
can't handle multiple connections at the same time.
It's particularly true on windows XP
*/
#ifndef LIBOPENSSL
#include <stdio.h>
void dummy_rdp() {
printf("\n");
}
#else
#include "rdp.h"
extern char *HYDRA_EXIT;
BOOL g_encryption = True;
BOOL g_use_rdp5 = True;
BOOL g_console_session = False;
BOOL g_bitmap_cache = True;
BOOL g_bitmap_cache_persist_enable = False;
BOOL g_bitmap_compression = True;
BOOL g_desktop_save = True;
int g_server_depth = -1;
int os_version = 0; //2000
uint32 g_rdp5_performanceflags = RDP5_NO_WALLPAPER | RDP5_NO_FULLWINDOWDRAG | RDP5_NO_MENUANIMATIONS;
/* Session Directory redirection */
BOOL g_redirect = False;
uint32 g_redirect_flags = 0;
uint32 g_reconnect_logonid = 0;
char g_reconnect_random[16];
BOOL g_has_reconnect_random = False;
uint8 g_client_random[SEC_RANDOM_SIZE];
/*
0 unknown
1 success
2 failed
*/
#define LOGIN_UNKN 0
#define LOGIN_SUCC 1
#define LOGIN_FAIL 2
int login_result = LOGIN_UNKN;
uint8 *g_next_packet;
uint32 g_rdp_shareid;
/* Called during redirection to reset the state to support redirection */
void rdp_reset_state(void) {
g_next_packet = NULL; /* reset the packet information */
g_rdp_shareid = 0;
sec_reset_state();
}
static void rdesktop_reset_state(void) {
rdp_reset_state();
}
static RDP_ORDER_STATE g_order_state;
#define TCP_STRERROR strerror(errno)
#define TCP_BLOCKS (errno == EWOULDBLOCK)
#ifndef INADDR_NONE
#define INADDR_NONE ((unsigned long) -1)
#endif
#define STREAM_COUNT 1
int g_sock;
static struct stream g_in;
static struct stream g_out[STREAM_COUNT];
/* wait till socket is ready to write or timeout */
static BOOL tcp_can_send(int sck, int millis) {
fd_set wfds;
struct timeval time;
int sel_count;
time.tv_sec = millis / 1000;
time.tv_usec = (millis * 1000) % 1000000;
FD_ZERO(&wfds);
FD_SET(sck, &wfds);
sel_count = select(sck + 1, 0, &wfds, 0, &time);
if (sel_count > 0) {
return True;
}
return False;
}
/* Initialise TCP transport data packet */
STREAM tcp_init(uint32 maxlen) {
static int cur_stream_id = 0;
STREAM result = NULL;
result = &g_out[cur_stream_id];
cur_stream_id = (cur_stream_id + 1) % STREAM_COUNT;
if (maxlen > result->size) {
result->data = (uint8 *) xrealloc(result->data, maxlen);
result->size = maxlen;
}
result->p = result->data;
result->end = result->data; // + result->size;
return result;
}
/* Send TCP transport data packet */
void tcp_send(STREAM s) {
int length = s->end - s->data;
int sent, total = 0;
while (total < length) {
sent = hydra_send(g_sock, (char *) (s->data + total), length - total, 0);
if (sent <= 0) {
if (sent == -1 && TCP_BLOCKS) {
tcp_can_send(g_sock, 100);
sent = 0;
} else {
if (g_sock && !login_result)
error("send: %s\n", TCP_STRERROR);
return;
}
}
total += sent;
}
}
/* Receive a message on the TCP layer */
STREAM tcp_recv(STREAM s, uint32 length) {
uint32 new_length, end_offset, p_offset;
int rcvd = 0;
if (s == NULL) {
/* read into "new" stream */
g_in.data = (uint8 *) xmalloc(length);
g_in.size = length;
g_in.end = g_in.p = g_in.data;
s = &g_in;
} else {
/* append to existing stream */
new_length = (s->end - s->data) + length;
if (new_length > s->size) {
p_offset = s->p - s->data;
end_offset = s->end - s->data;
//printf("length: %d, %p s->data, %p +%d s->p, %p +%d s->end, end-data %d, size %d\n", length, s->data, s->p, s->p - s->data, s->end, s->end - s->p, s->end - s->data, s->size);
s->data = (uint8 *) xrealloc(s->data, new_length);
s->size = new_length;
s->p = s->data + p_offset;
s->end = s->data + end_offset;
}
}
while (length > 0) {
rcvd = hydra_recv(g_sock, (char *) s->end, length);
if (rcvd < 0) {
if (rcvd == -1 && TCP_BLOCKS) {
rcvd = 0;
} else {
//error("recv: %s\n", TCP_STRERROR);
return NULL;
}
} else if (rcvd == 0) {
error("Connection closed\n");
return NULL;
}
s->end += rcvd;
length -= rcvd;
}
return s;
}
char *tcp_get_address() {
static char ipaddr[32];
struct sockaddr_in sockaddr;
socklen_t len = sizeof(sockaddr);
if (getsockname(g_sock, (struct sockaddr *) &sockaddr, &len) == 0) {
uint8 *ip = (uint8 *) & sockaddr.sin_addr;
sprintf(ipaddr, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
} else
strcpy(ipaddr, "127.0.0.1");
return ipaddr;
}
/* reset the state of the tcp layer */
void tcp_reset_state(void) {
int i;
g_sock = -1; /* reset socket */
/* Clear the incoming stream */
if (g_in.data != NULL)
free(g_in.data);
g_in.p = NULL;
g_in.end = NULL;
g_in.data = NULL;
g_in.size = 0;
g_in.iso_hdr = NULL;
g_in.mcs_hdr = NULL;
g_in.sec_hdr = NULL;
g_in.rdp_hdr = NULL;
g_in.channel_hdr = NULL;
/* Clear the outgoing stream(s) */
for (i = 0; i < STREAM_COUNT; i++) {
if (g_out[i].data != NULL)
free(g_out[i].data);
g_out[i].p = NULL;
g_out[i].end = NULL;
g_out[i].data = NULL;
g_out[i].size = 0;
g_out[i].iso_hdr = NULL;
g_out[i].mcs_hdr = NULL;
g_out[i].sec_hdr = NULL;
g_out[i].rdp_hdr = NULL;
g_out[i].channel_hdr = NULL;
}
}
uint16 g_mcs_userid;
/* Parse an ASN.1 BER header */
static BOOL ber_parse_header(STREAM s, int tagval, int *length) {
int tag, len;
if (tagval > 0xff) {
in_uint16_be(s, tag);
} else {
in_uint8(s, tag);
}
if (tag != tagval) {
error("expected tag %d, got %d\n", tagval, tag);
return False;
}
in_uint8(s, len);
if (len & 0x80) {
len &= ~0x80;
*length = 0;
while (len--)
next_be(s, *length);
} else
*length = len;
return s_check(s);
}
/* Output an ASN.1 BER header */
static void ber_out_header(STREAM s, int tagval, int length) {
if (tagval > 0xff) {
out_uint16_be(s, tagval);
} else {
out_uint8(s, tagval);
}
if (length >= 0x80) {
out_uint8(s, 0x82);
out_uint16_be(s, length);
} else
out_uint8(s, length);
}
/* Output an ASN.1 BER integer */
static void ber_out_integer(STREAM s, int value) {
ber_out_header(s, BER_TAG_INTEGER, 2);
out_uint16_be(s, value);
}
/* Output a DOMAIN_PARAMS structure (ASN.1 BER) */
static void mcs_out_domain_params(STREAM s, int max_channels, int max_users, int max_tokens, int max_pdusize) {
ber_out_header(s, MCS_TAG_DOMAIN_PARAMS, 32);
ber_out_integer(s, max_channels);
ber_out_integer(s, max_users);
ber_out_integer(s, max_tokens);
ber_out_integer(s, 1); /* num_priorities */
ber_out_integer(s, 0); /* min_throughput */
ber_out_integer(s, 1); /* max_height */
ber_out_integer(s, max_pdusize);
ber_out_integer(s, 2); /* ver_protocol */
}
/* Parse a DOMAIN_PARAMS structure (ASN.1 BER) */
static BOOL mcs_parse_domain_params(STREAM s) {
int length = 0;
ber_parse_header(s, MCS_TAG_DOMAIN_PARAMS, &length);
in_uint8s(s, length);
return s_check(s);
}
/* Send an MCS_CONNECT_INITIAL message (ASN.1 BER) */
static void mcs_send_connect_initial(STREAM mcs_data) {
int datalen = mcs_data->end - mcs_data->data;
int length = 9 + 3 * 34 + 4 + datalen;
STREAM s;
s = iso_init(length + 5);
ber_out_header(s, MCS_CONNECT_INITIAL, length);
ber_out_header(s, BER_TAG_OCTET_STRING, 1); /* calling domain */
out_uint8(s, 1);
ber_out_header(s, BER_TAG_OCTET_STRING, 1); /* called domain */
out_uint8(s, 1);
ber_out_header(s, BER_TAG_BOOLEAN, 1);
out_uint8(s, 0xff); /* upward flag */
mcs_out_domain_params(s, 34, 2, 0, 0xffff); /* target params */
mcs_out_domain_params(s, 1, 1, 1, 0x420); /* min params */
mcs_out_domain_params(s, 0xffff, 0xfc17, 0xffff, 0xffff); /* max params */
ber_out_header(s, BER_TAG_OCTET_STRING, datalen);
out_uint8p(s, mcs_data->data, datalen);
s_mark_end(s);
iso_send(s);
}
/* Expect a MCS_CONNECT_RESPONSE message (ASN.1 BER) */
static BOOL mcs_recv_connect_response(STREAM mcs_data) {
uint8 result;
int length = 0;
STREAM s;
s = iso_recv(NULL);
if (s == NULL)
return False;
ber_parse_header(s, MCS_CONNECT_RESPONSE, &length);
ber_parse_header(s, BER_TAG_RESULT, &length);
in_uint8(s, result);
if (result != 0) {
error("MCS connect: %d\n", result);
return False;
}
ber_parse_header(s, BER_TAG_INTEGER, &length);
in_uint8s(s, length); /* connect id */
mcs_parse_domain_params(s);
ber_parse_header(s, BER_TAG_OCTET_STRING, &length);
sec_process_mcs_data(s);
/*
if (length > mcs_data->size)
{
error("MCS data length %d, expected %d\n", length,
mcs_data->size);
length = mcs_data->size;
}
in_uint8a(s, mcs_data->data, length);
mcs_data->p = mcs_data->data;
mcs_data->end = mcs_data->data + length;
*/
return s_check_end(s);
}
/* Send an EDrq message (ASN.1 PER) */
static void mcs_send_edrq(void) {
STREAM s;
s = iso_init(5);
out_uint8(s, (MCS_EDRQ << 2));
out_uint16_be(s, 1); /* height */
out_uint16_be(s, 1); /* interval */
s_mark_end(s);
iso_send(s);
}
/* Send an AUrq message (ASN.1 PER) */
static void mcs_send_aurq(void) {
STREAM s;
s = iso_init(1);
out_uint8(s, (MCS_AURQ << 2));
s_mark_end(s);
iso_send(s);
}
/* Expect a AUcf message (ASN.1 PER) */
static BOOL mcs_recv_aucf(uint16 * mcs_userid) {
uint8 opcode, result;
STREAM s;
s = iso_recv(NULL);
if (s == NULL)
return False;
in_uint8(s, opcode);
if ((opcode >> 2) != MCS_AUCF) {
error("expected AUcf, got %d\n", opcode);
return False;
}
in_uint8(s, result);
if (result != 0) {
error("AUrq: %d\n", result);
return False;
}
if (opcode & 2)
in_uint16_be(s, *mcs_userid);
return s_check_end(s);
}
/* Send a CJrq message (ASN.1 PER) */
static void mcs_send_cjrq(uint16 chanid) {
STREAM s;
DEBUG_RDP5(("Sending CJRQ for channel #%d\n", chanid));
s = iso_init(5);
out_uint8(s, (MCS_CJRQ << 2));
out_uint16_be(s, g_mcs_userid);
out_uint16_be(s, chanid);
s_mark_end(s);
iso_send(s);
}
/* Expect a CJcf message (ASN.1 PER) */
static BOOL mcs_recv_cjcf(void) {
uint8 opcode, result;
STREAM s;
s = iso_recv(NULL);
if (s == NULL)
return False;
in_uint8(s, opcode);
if ((opcode >> 2) != MCS_CJCF) {
error("expected CJcf, got %d\n", opcode);
return False;
}
in_uint8(s, result);
if (result != 0) {
error("CJrq: %d\n", result);
return False;
}
in_uint8s(s, 4); /* mcs_userid, req_chanid */
if (opcode & 2)
in_uint8s(s, 2); /* join_chanid */
return s_check_end(s);
}
/* Initialise an MCS transport data packet */
STREAM mcs_init(int length) {
STREAM s;
s = iso_init(length + 8);
s_push_layer(s, mcs_hdr, 8);
return s;
}
/* Send an MCS transport data packet to a specific channel */
void mcs_send_to_channel(STREAM s, uint16 channel) {
uint16 length;
s_pop_layer(s, mcs_hdr);
length = s->end - s->p - 8;
length |= 0x8000;
out_uint8(s, (MCS_SDRQ << 2));
out_uint16_be(s, g_mcs_userid);
out_uint16_be(s, channel);
out_uint8(s, 0x70); /* flags */
out_uint16_be(s, length);
iso_send(s);
}
/* Send an MCS transport data packet to the global channel */
void mcs_send(STREAM s) {
mcs_send_to_channel(s, MCS_GLOBAL_CHANNEL);
}
/* Receive an MCS transport data packet */
STREAM mcs_recv(uint16 * channel, uint8 * rdpver) {
uint8 opcode, appid, length;
STREAM s;
s = iso_recv(rdpver);
if (s == NULL)
return NULL;
if (rdpver != NULL)
if (*rdpver != 3)
return s;
in_uint8(s, opcode);
appid = opcode >> 2;
if (appid != MCS_SDIN) {
if (appid != MCS_DPUM) {
error("expected data, got %d\n", opcode);
}
return NULL;
}
in_uint8s(s, 2); /* userid */
in_uint16_be(s, *channel);
in_uint8s(s, 1); /* flags */
in_uint8(s, length);
if (length & 0x80)
in_uint8s(s, 1); /* second byte of length */
return s;
}
BOOL mcs_connect(char *server, STREAM mcs_data, char *username, BOOL reconnect) {
if (!iso_connect(server, username, reconnect))
return False;
mcs_send_connect_initial(mcs_data);
if (!mcs_recv_connect_response(mcs_data))
goto error;
mcs_send_edrq();
mcs_send_aurq();
if (!mcs_recv_aucf(&g_mcs_userid))
goto error;
mcs_send_cjrq(g_mcs_userid + MCS_USERCHANNEL_BASE);
if (!mcs_recv_cjcf())
goto error;
mcs_send_cjrq(MCS_GLOBAL_CHANNEL);
if (!mcs_recv_cjcf())
goto error;
return True;
error:
iso_disconnect();
return False;
}
/* Disconnect from the MCS layer */
void mcs_disconnect(void) {
iso_disconnect();
}
/* reset the state of the mcs layer */
void mcs_reset_state(void) {
g_mcs_userid = 0;
iso_reset_state();
}
/* Send a self-contained ISO PDU */
static void iso_send_msg(uint8 code) {
STREAM s;
s = tcp_init(11);
out_uint8(s, 3); /* version */
out_uint8(s, 0); /* reserved */
out_uint16_be(s, 11); /* length */
out_uint8(s, 6); /* hdrlen */
out_uint8(s, code);
out_uint16(s, 0); /* dst_ref */
out_uint16(s, 0); /* src_ref */
out_uint8(s, 0); /* class */
s_mark_end(s);
tcp_send(s);
}
static void iso_send_connection_request(char *username) {
STREAM s;
int length = 30 + strlen(username);
s = tcp_init(length);
out_uint8(s, 3); /* version */
out_uint8(s, 0); /* reserved */
out_uint16_be(s, length); /* length */
out_uint8(s, length - 5); /* hdrlen */
out_uint8(s, ISO_PDU_CR);
out_uint16(s, 0); /* dst_ref */
out_uint16(s, 0); /* src_ref */
out_uint8(s, 0); /* class */
out_uint8p(s, "Cookie: mstshash=", strlen("Cookie: mstshash="));
out_uint8p(s, username, strlen(username));
out_uint8(s, 0x0d); /* Unknown */
out_uint8(s, 0x0a); /* Unknown */
s_mark_end(s);
tcp_send(s);
}
/* Send a single input event fast JL, this is required for win8 */
void rdp_send_fast_input_kbd(uint32 time, uint16 flags, uint16 param1) {
STREAM s;
uint8 fast_flags = 0;
uint8 len=4;
fast_flags |= (flags & RDP_KEYRELEASE) ? FASTPATH_INPUT_KBDFLAGS_RELEASE : 0;
s = tcp_init(len);
out_uint8(s, (1 << 2)); //one event
out_uint8(s, len);
out_uint8(s, fast_flags|(FASTPATH_INPUT_EVENT_SCANCODE<<5));
out_uint8(s, param1);
s_mark_end(s);
tcp_send(s);
}
/* Send a single input event fast JL, this is required for win8 */
void rdp_send_fast_input_mouse(uint32 time, uint16 flags, uint16 param1,uint16 param2) {
STREAM s;
uint8 len=9;
s = tcp_init(len);
out_uint8(s, (1 << 2)); //one event
out_uint8(s, len);
out_uint8(s, (FASTPATH_INPUT_EVENT_MOUSE<<5));
out_uint16(s, flags);
out_uint16(s, param1);
out_uint16(s, param2);
s_mark_end(s);
tcp_send(s);
}
/* Receive a message on the ISO layer, return code */
static STREAM iso_recv_msg(uint8 * code, uint8 * rdpver) {
STREAM s;
uint16 length;
uint8 version;
s = tcp_recv(NULL, 4);
if (s == NULL)
return NULL;
in_uint8(s, version);
if (rdpver != NULL)
*rdpver = version;
if (version == 3) {
in_uint8s(s, 1); /* pad */
in_uint16_be(s, length);
} else {
in_uint8(s, length);
if (length & 0x80) {
length &= ~0x80;
next_be(s, length);
}
}
if (length < 5) {
error("Bad packet header\n");
return NULL;
}
s = tcp_recv(s, length - 4);
if (s == NULL)
return NULL;
if (version != 3)
return s;
in_uint8s(s, 1); /* hdrlen */
in_uint8(s, *code);
if (*code == ISO_PDU_DT) {
in_uint8s(s, 1); /* eot */
return s;
}
in_uint8s(s, 5); /* dst_ref, src_ref, class */
return s;
}
/* Initialise ISO transport data packet */
STREAM iso_init(int length) {
STREAM s;
s = tcp_init(length + 7);
s_push_layer(s, iso_hdr, 7);
return s;
}
/* Send an ISO data PDU */
void iso_send(STREAM s) {
uint16 length;
s_pop_layer(s, iso_hdr);
length = s->end - s->p;
out_uint8(s, 3); /* version */
out_uint8(s, 0); /* reserved */
out_uint16_be(s, length);
out_uint8(s, 2); /* hdrlen */
out_uint8(s, ISO_PDU_DT); /* code */
out_uint8(s, 0x80); /* eot */
tcp_send(s);
}
/* Receive ISO transport data packet */
STREAM iso_recv(uint8 * rdpver) {
STREAM s;
uint8 code = 0;
s = iso_recv_msg(&code, rdpver);
if (s == NULL)
return NULL;
if (rdpver != NULL)
if (*rdpver != 3)
return s;
if (code != ISO_PDU_DT) {
error("expected DT, got 0x%x\n", code);
return NULL;
}
return s;
}
/* Establish a connection up to the ISO layer */
BOOL iso_connect(char *server, char *username, BOOL reconnect) {
uint8 code = 0;
if (reconnect) {
iso_send_msg(ISO_PDU_CR);
} else {
iso_send_connection_request(username);
}
if (iso_recv_msg(&code, NULL) == NULL) {
return False;
}
if (code != ISO_PDU_CC) {
error("expected CC, got 0x%x\n", code);
hydra_disconnect(g_sock);
return False;
}
return True;
}
/* Disconnect from the ISO layer */
void iso_disconnect(void) {
iso_send_msg(ISO_PDU_DR);
g_sock=hydra_disconnect(g_sock);
}
/* reset the state to support reconnecting */
void iso_reset_state(void) {
tcp_reset_state();
}
static int g_rc4_key_len;
static SSL_RC4 g_rc4_decrypt_key;
static SSL_RC4 g_rc4_encrypt_key;
static uint32 g_server_public_key_len;
static uint8 g_sec_sign_key[16];
static uint8 g_sec_decrypt_key[16];
static uint8 g_sec_encrypt_key[16];
static uint8 g_sec_decrypt_update_key[16];
static uint8 g_sec_encrypt_update_key[16];
static uint8 g_sec_crypted_random[SEC_MAX_MODULUS_SIZE];
uint16 g_server_rdp_version = 0;
/* These values must be available to reset state - Session Directory */
static int g_sec_encrypt_use_count = 0;
static int g_sec_decrypt_use_count = 0;
void ssl_sha1_init(SSL_SHA1 * sha1) {
SHA1_Init(sha1);
}
void ssl_sha1_update(SSL_SHA1 * sha1, uint8 * data, uint32 len) {
SHA1_Update(sha1, data, len);
}
void ssl_sha1_final(SSL_SHA1 * sha1, uint8 * out_data) {
SHA1_Final(out_data, sha1);
}
void ssl_md5_init(SSL_MD5 * md5) {
MD5_Init(md5);
}
void ssl_md5_update(SSL_MD5 * md5, uint8 * data, uint32 len) {
MD5_Update(md5, data, len);
}
void ssl_md5_final(SSL_MD5 * md5, uint8 * out_data) {
MD5_Final(out_data, md5);
}
void ssl_rc4_set_key(SSL_RC4 * rc4, uint8 * key, uint32 len) {
RC4_set_key(rc4, len, key);
}
void ssl_rc4_crypt(SSL_RC4 * rc4, uint8 * in_data, uint8 * out_data, uint32 len) {
RC4(rc4, len, in_data, out_data);
}
static void reverse(uint8 * p, int len) {
int i, j;
uint8 temp;
for (i = 0, j = len - 1; i < j; i++, j--) {
temp = p[i];
p[i] = p[j];
p[j] = temp;
}
}
void ssl_rsa_encrypt(uint8 * out, uint8 * in, int len, uint32 modulus_size, uint8 * modulus, uint8 * exponent) {
BN_CTX *ctx;
BIGNUM mod, exp, x, y;
uint8 inr[SEC_MAX_MODULUS_SIZE];
int outlen;
reverse(modulus, modulus_size);
reverse(exponent, SEC_EXPONENT_SIZE);
memcpy(inr, in, len);
reverse(inr, len);
ctx = BN_CTX_new();
BN_init(&mod);
BN_init(&exp);
BN_init(&x);
BN_init(&y);
BN_bin2bn(modulus, modulus_size, &mod);
BN_bin2bn(exponent, SEC_EXPONENT_SIZE, &exp);
BN_bin2bn(inr, len, &x);
BN_mod_exp(&y, &x, &exp, &mod, ctx);
outlen = BN_bn2bin(&y, out);
reverse(out, outlen);
if (outlen < (int) modulus_size)
memset(out + outlen, 0, modulus_size - outlen);
BN_free(&y);
BN_clear_free(&x);
BN_free(&exp);
BN_free(&mod);
BN_CTX_free(ctx);
}
/* returns newly allocated SSL_CERT or NULL */
SSL_CERT *ssl_cert_read(uint8 * data, uint32 len) {
/* this will move the data pointer but we don't care, we don't use it again */
return d2i_X509(NULL, (D2I_X509_CONST unsigned char **) &data, len);
}
void ssl_cert_free(SSL_CERT * cert) {
X509_free(cert);
}
/* returns newly allocated SSL_RKEY or NULL */
SSL_RKEY *ssl_cert_to_rkey(SSL_CERT * cert, uint32 * key_len) {
EVP_PKEY *epk = NULL;
SSL_RKEY *lkey;
int nid;
/* By some reason, Microsoft sets the OID of the Public RSA key to
the oid for "MD5 with RSA Encryption" instead of "RSA Encryption"
Kudos to Richard Levitte for the following (. intiutive .)
lines of code that resets the OID and let's us extract the key. */
nid = OBJ_obj2nid(cert->cert_info->key->algor->algorithm);
if ((nid == NID_md5WithRSAEncryption) || (nid == NID_shaWithRSAEncryption)) {
DEBUG_RDP5(("Re-setting algorithm type to RSA in server certificate\n"));
ASN1_OBJECT_free(cert->cert_info->key->algor->algorithm);
cert->cert_info->key->algor->algorithm = OBJ_nid2obj(NID_rsaEncryption);
}
epk = X509_get_pubkey(cert);
if (NULL == epk) {
error("Failed to extract public key from certificate\n");
return NULL;
}
lkey = RSAPublicKey_dup(EVP_PKEY_get1_RSA(epk));
EVP_PKEY_free(epk);
*key_len = RSA_size(lkey);
return lkey;
}
int ssl_cert_print_fp(FILE * fp, SSL_CERT * cert) {
return X509_print_fp(fp, cert);
}
void ssl_rkey_free(SSL_RKEY * rkey) {
RSA_free(rkey);
}
/* returns error */
int ssl_rkey_get_exp_mod(SSL_RKEY * rkey, uint8 * exponent, uint32 max_exp_len, uint8 * modulus, uint32 max_mod_len) {
int len;
if ((BN_num_bytes(rkey->e) > (int) max_exp_len) || (BN_num_bytes(rkey->n) > (int) max_mod_len)) {
return 1;
}
len = BN_bn2bin(rkey->e, exponent);
reverse(exponent, len);
len = BN_bn2bin(rkey->n, modulus);
reverse(modulus, len);
return 0;
}
/* returns boolean */
BOOL ssl_sig_ok(uint8 * exponent, uint32 exp_len, uint8 * modulus, uint32 mod_len, uint8 * signature, uint32 sig_len) {
return True;
}
void ssl_hmac_md5(const void *key, int key_len, const unsigned char *msg, int msg_len, unsigned char *md) {
HMAC_CTX ctx;
HMAC_CTX_init(&ctx);
HMAC(EVP_md5(), key, key_len, msg, msg_len, md, NULL);
HMAC_CTX_cleanup(&ctx);
}
/*
* I believe this is based on SSLv3 with the following differences:
* MAC algorithm (5.2.3.1) uses only 32-bit length in place of seq_num/type/length fields
* MAC algorithm uses SHA1 and MD5 for the two hash functions instead of one or other
* key_block algorithm (6.2.2) uses 'X', 'YY', 'ZZZ' instead of 'A', 'BB', 'CCC'
* key_block partitioning is different (16 bytes each: MAC secret, decrypt key, encrypt key)
* encryption/decryption keys updated every 4096 packets
* See http://wp.netscape.com/eng/ssl3/draft302.txt
*/
/*
* 48-byte transformation used to generate master secret (6.1) and key material (6.2.2).
* Both SHA1 and MD5 algorithms are used.
*/
void sec_hash_48(uint8 * out, uint8 * in, uint8 * salt1, uint8 * salt2, uint8 salt) {
uint8 shasig[20];
uint8 pad[4];
SSL_SHA1 sha1;
SSL_MD5 md5;
int i;
for (i = 0; i < 3; i++) {
memset(pad, salt + i, i + 1);
ssl_sha1_init(&sha1);
ssl_sha1_update(&sha1, pad, i + 1);
ssl_sha1_update(&sha1, in, 48);
ssl_sha1_update(&sha1, salt1, 32);
ssl_sha1_update(&sha1, salt2, 32);
ssl_sha1_final(&sha1, shasig);
ssl_md5_init(&md5);
ssl_md5_update(&md5, in, 48);