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ntlm.c
1038 lines (912 loc) · 31.8 KB
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ntlm.c
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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2008-2015 Intel Corporation.
*
* Author: David Woodhouse <dwmw2@infradead.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1, as published by the Free Software Foundation.
*
* 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
* Lesser General Public License for more details.
*/
#include <config.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <ctype.h>
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif
#ifndef _WIN32
#include <sys/wait.h>
#endif
#include "openconnect-internal.h"
#define NTLM_SSO_REQ 2 /* SSO type1 packet sent */
#define NTLM_MANUAL 3 /* SSO challenge/response sent or skipped; manual next */
#define NTLM_MANUAL_REQ 4 /* manual type1 packet sent */
#ifdef _WIN32
static int ntlm_sspi(struct openconnect_info *vpninfo, int proxy,
struct http_auth_state *auth_state,
struct oc_text_buf *buf, const char *challenge)
{
SECURITY_STATUS status;
SecBufferDesc input_desc, output_desc;
SecBuffer in_token, out_token;
ULONG ret_flags;
if (challenge) {
int token_len = -EINVAL;
input_desc.cBuffers = 1;
input_desc.pBuffers = &in_token;
input_desc.ulVersion = SECBUFFER_VERSION;
in_token.BufferType = SECBUFFER_TOKEN;
in_token.pvBuffer = openconnect_base64_decode(&token_len, challenge);
if (!in_token.pvBuffer)
return token_len;
in_token.cbBuffer = token_len;
}
output_desc.cBuffers = 1;
output_desc.pBuffers = &out_token;
output_desc.ulVersion = SECBUFFER_VERSION;
out_token.BufferType = SECBUFFER_TOKEN;
out_token.cbBuffer = 0;
out_token.pvBuffer = NULL;
status = InitializeSecurityContextW(&auth_state->ntlm_sspi_cred,
challenge ? &auth_state->ntlm_sspi_ctx : NULL,
(SEC_WCHAR *)L"",
ISC_REQ_ALLOCATE_MEMORY | ISC_REQ_CONFIDENTIALITY | ISC_REQ_REPLAY_DETECT | ISC_REQ_CONNECTION,
0, SECURITY_NETWORK_DREP,
challenge ? &input_desc : NULL,
0, &auth_state->ntlm_sspi_ctx,
&output_desc, &ret_flags, NULL);
if (status != SEC_E_OK && status != SEC_I_CONTINUE_NEEDED) {
vpn_progress(vpninfo, PRG_ERR,
_("InitializeSecurityContext() failed: %lx\n"), status);
return -EIO;
}
buf_append(buf, "%sAuthorization: NTLM ", proxy ? "Proxy-" : "");
buf_append_base64(buf, out_token.pvBuffer, out_token.cbBuffer);
buf_append(buf, "\r\n");
FreeContextBuffer(out_token.pvBuffer);
return 0;
}
static int ntlm_helper_spawn(struct openconnect_info *vpninfo, int proxy,
struct http_auth_state *auth_state,
struct oc_text_buf *buf)
{
SECURITY_STATUS status;
int ret;
status = AcquireCredentialsHandleW(NULL, (SEC_WCHAR *)L"NTLM",
SECPKG_CRED_OUTBOUND, NULL, NULL,
NULL, NULL,
&auth_state->ntlm_sspi_cred, NULL);
if (status != SEC_E_OK) {
vpn_progress(vpninfo, PRG_ERR,
_("AcquireCredentialsHandle() failed: %lx\n"), status);
return -EIO;
}
ret = ntlm_sspi(vpninfo, proxy, auth_state, buf, NULL);
if (ret)
FreeCredentialsHandle(&auth_state->ntlm_sspi_cred);
return ret;
}
static int ntlm_helper_challenge(struct openconnect_info *vpninfo, int proxy,
struct http_auth_state *auth_state,
struct oc_text_buf *buf)
{
return ntlm_sspi(vpninfo, proxy, auth_state, buf, auth_state->challenge);
}
void cleanup_ntlm_auth(struct openconnect_info *vpninfo,
struct http_auth_state *auth_state)
{
if (auth_state->state == NTLM_SSO_REQ) {
FreeCredentialsHandle(&auth_state->ntlm_sspi_cred);
DeleteSecurityContext(&auth_state->ntlm_sspi_ctx);
}
}
#else /* !_WIN32 */
static int ntlm_helper_spawn(struct openconnect_info *vpninfo, int proxy,
struct http_auth_state *auth_state,
struct oc_text_buf *buf)
{
char *username;
int pipefd[2];
pid_t pid;
char helperbuf[4096];
int len;
if (access("/usr/bin/ntlm_auth", X_OK))
return -errno;
username = vpninfo->proxy_user;
if (!username)
username = getenv("NTLMUSER");
if (!username)
username = getenv("USER");
if (!username)
return -EINVAL;
#ifdef SOCK_CLOEXEC
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, pipefd))
#endif
{
if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipefd))
return -errno;
set_fd_cloexec(pipefd[0]);
set_fd_cloexec(pipefd[1]);
}
pid = fork();
if (pid == -1)
return -errno;
if (!pid) {
int i;
char *p;
const char *argv[9];
/* Fork again to detach grandchild */
if (fork())
exit(1);
close(pipefd[1]);
/* The duplicated fd does not have O_CLOEXEC */
dup2(pipefd[0], 0);
dup2(pipefd[0], 1);
/* Should we leave stderr open? */
for (i = 3; i < 1024 ; i++)
close(i);
i = 0;
argv[i++] = "/usr/bin/ntlm_auth";
argv[i++] = "--helper-protocol";
argv[i++] = "ntlmssp-client-1";
argv[i++] = "--use-cached-creds";
argv[i++] = "--username";
p = strchr(username, '\\');
if (p) {
argv[i++] = p+1;
argv[i++] = "--domain";
argv[i++] = strndup(username, p - username);
} else
argv[i++] = username;
argv[i++] = NULL;
execv(argv[0], (char **)argv);
exit(1);
}
waitpid(pid, NULL, 0);
close(pipefd[0]);
if (write(pipefd[1], "YR\n", 3) != 3) {
close(pipefd[1]);
return -EIO;
}
len = read(pipefd[1], helperbuf, sizeof(helperbuf));
if (len < 4 || helperbuf[0] != 'Y' || helperbuf[1] != 'R' ||
helperbuf[2] != ' ' || helperbuf[len - 1] != '\n') {
close(pipefd[1]);
return -EIO;
}
helperbuf[len - 1] = 0;
buf_append(buf, "%sAuthorization: NTLM %s\r\n", proxy ? "Proxy-" : "",
helperbuf + 3);
auth_state->ntlm_helper_fd = pipefd[1];
return 0;
}
static int ntlm_helper_challenge(struct openconnect_info *vpninfo, int proxy,
struct http_auth_state *auth_state,
struct oc_text_buf *buf)
{
char helperbuf[4096];
int len;
if (!auth_state->challenge ||
write(auth_state->ntlm_helper_fd, "TT ", 3) != 3 ||
write(auth_state->ntlm_helper_fd, auth_state->challenge,
strlen(auth_state->challenge)) != strlen(auth_state->challenge) ||
write(auth_state->ntlm_helper_fd, "\n", 1) != 1) {
err:
vpn_progress(vpninfo, PRG_ERR, _("Error communicating with ntlm_auth helper\n"));
close(auth_state->ntlm_helper_fd);
auth_state->ntlm_helper_fd = -1;
return -EAGAIN;
}
len = read(auth_state->ntlm_helper_fd, helperbuf, sizeof(helperbuf));
/* Accept both 'KK' and 'AF'. It should be the latter but see
https://bugzilla.samba.org/show_bug.cgi?id=10691 */
if (len < 4 || (!(helperbuf[0] == 'K' && helperbuf[1] == 'K') &&
!(helperbuf[0] == 'A' && helperbuf[1] == 'F')) ||
helperbuf[2] != ' ' || helperbuf[len - 1] != '\n') {
goto err;
}
helperbuf[len - 1] = 0;
buf_append(buf, "%sAuthorization: NTLM %s\r\n", proxy ? "Proxy-" : "",
helperbuf + 3);
if (proxy)
vpn_progress(vpninfo, PRG_INFO,
_("Attempting HTTP NTLM authentication to proxy (single-sign-on)\n"));
else
vpn_progress(vpninfo, PRG_INFO,
_("Attempting HTTP NTLM authentication to server '%s' (single-sign-on)\n"),
vpninfo->hostname);
return 0;
}
void cleanup_ntlm_auth(struct openconnect_info *vpninfo,
struct http_auth_state *auth_state)
{
if (auth_state->state == NTLM_SSO_REQ) {
close(auth_state->ntlm_helper_fd);
auth_state->ntlm_helper_fd = -1;
}
}
#endif /* !_WIN32 */
/*
* NTLM implementation taken from libsoup / Evolution Data Server
* Copyright (C) 2007 Red Hat, Inc.
* Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
*/
/* DES */
typedef uint32_t DES_KS[16][2]; /* Single-key DES key schedule */
/*
* MD4 encoder. (The one everyone else uses is not GPL-compatible;
* this is a reimplementation from spec.) This doesn't need to be
* efficient for our purposes, although it would be nice to fix
* it to not malloc()...
*/
#define F(X,Y,Z) ( ((X)&(Y)) | ((~(X))&(Z)) )
#define G(X,Y,Z) ( ((X)&(Y)) | ((X)&(Z)) | ((Y)&(Z)) )
#define H(X,Y,Z) ( (X)^(Y)^(Z) )
#define ROT(val, n) ( ((val) << (n)) | ((val) >> (32 - (n))) )
static int md4sum (struct oc_text_buf *buf, unsigned char digest[16])
{
int nbytes = buf->pos;
unsigned char *M;
uint32_t A, B, C, D, AA, BB, CC, DD, X[16];
int pbytes, nbits = nbytes * 8, i, j;
/* There is *always* padding of at least one bit. */
pbytes = ((119 - (nbytes % 64)) % 64) + 1;
if (buf_ensure_space (buf, pbytes + 8))
return -ENOMEM;
M = (void *)buf->data;
memset (M + nbytes, 0, pbytes + 8);
M[nbytes] = 0x80;
store_le32(&M[nbytes + pbytes], nbits);
A = 0x67452301;
B = 0xEFCDAB89;
C = 0x98BADCFE;
D = 0x10325476;
for (i = 0; i < nbytes + pbytes + 8; i += 64) {
for (j = 0; j < 16; j++)
X[j] = load_le32(&M[i + j * 4]);
AA = A;
BB = B;
CC = C;
DD = D;
A = ROT (A + F (B, C, D) + X[0], 3);
D = ROT (D + F (A, B, C) + X[1], 7);
C = ROT (C + F (D, A, B) + X[2], 11);
B = ROT (B + F (C, D, A) + X[3], 19);
A = ROT (A + F (B, C, D) + X[4], 3);
D = ROT (D + F (A, B, C) + X[5], 7);
C = ROT (C + F (D, A, B) + X[6], 11);
B = ROT (B + F (C, D, A) + X[7], 19);
A = ROT (A + F (B, C, D) + X[8], 3);
D = ROT (D + F (A, B, C) + X[9], 7);
C = ROT (C + F (D, A, B) + X[10], 11);
B = ROT (B + F (C, D, A) + X[11], 19);
A = ROT (A + F (B, C, D) + X[12], 3);
D = ROT (D + F (A, B, C) + X[13], 7);
C = ROT (C + F (D, A, B) + X[14], 11);
B = ROT (B + F (C, D, A) + X[15], 19);
A = ROT (A + G (B, C, D) + X[0] + 0x5A827999, 3);
D = ROT (D + G (A, B, C) + X[4] + 0x5A827999, 5);
C = ROT (C + G (D, A, B) + X[8] + 0x5A827999, 9);
B = ROT (B + G (C, D, A) + X[12] + 0x5A827999, 13);
A = ROT (A + G (B, C, D) + X[1] + 0x5A827999, 3);
D = ROT (D + G (A, B, C) + X[5] + 0x5A827999, 5);
C = ROT (C + G (D, A, B) + X[9] + 0x5A827999, 9);
B = ROT (B + G (C, D, A) + X[13] + 0x5A827999, 13);
A = ROT (A + G (B, C, D) + X[2] + 0x5A827999, 3);
D = ROT (D + G (A, B, C) + X[6] + 0x5A827999, 5);
C = ROT (C + G (D, A, B) + X[10] + 0x5A827999, 9);
B = ROT (B + G (C, D, A) + X[14] + 0x5A827999, 13);
A = ROT (A + G (B, C, D) + X[3] + 0x5A827999, 3);
D = ROT (D + G (A, B, C) + X[7] + 0x5A827999, 5);
C = ROT (C + G (D, A, B) + X[11] + 0x5A827999, 9);
B = ROT (B + G (C, D, A) + X[15] + 0x5A827999, 13);
A = ROT (A + H (B, C, D) + X[0] + 0x6ED9EBA1, 3);
D = ROT (D + H (A, B, C) + X[8] + 0x6ED9EBA1, 9);
C = ROT (C + H (D, A, B) + X[4] + 0x6ED9EBA1, 11);
B = ROT (B + H (C, D, A) + X[12] + 0x6ED9EBA1, 15);
A = ROT (A + H (B, C, D) + X[2] + 0x6ED9EBA1, 3);
D = ROT (D + H (A, B, C) + X[10] + 0x6ED9EBA1, 9);
C = ROT (C + H (D, A, B) + X[6] + 0x6ED9EBA1, 11);
B = ROT (B + H (C, D, A) + X[14] + 0x6ED9EBA1, 15);
A = ROT (A + H (B, C, D) + X[1] + 0x6ED9EBA1, 3);
D = ROT (D + H (A, B, C) + X[9] + 0x6ED9EBA1, 9);
C = ROT (C + H (D, A, B) + X[5] + 0x6ED9EBA1, 11);
B = ROT (B + H (C, D, A) + X[13] + 0x6ED9EBA1, 15);
A = ROT (A + H (B, C, D) + X[3] + 0x6ED9EBA1, 3);
D = ROT (D + H (A, B, C) + X[11] + 0x6ED9EBA1, 9);
C = ROT (C + H (D, A, B) + X[7] + 0x6ED9EBA1, 11);
B = ROT (B + H (C, D, A) + X[15] + 0x6ED9EBA1, 15);
A += AA;
B += BB;
C += CC;
D += DD;
}
store_le32(digest, A);
store_le32(digest + 4, B);
store_le32(digest + 8, C);
store_le32(digest + 12, D);
return 0;
}
/* Public domain DES implementation from Phil Karn */
static const uint32_t Spbox[8][64] = {
{ 0x01010400, 0x00000000, 0x00010000, 0x01010404,
0x01010004, 0x00010404, 0x00000004, 0x00010000,
0x00000400, 0x01010400, 0x01010404, 0x00000400,
0x01000404, 0x01010004, 0x01000000, 0x00000004,
0x00000404, 0x01000400, 0x01000400, 0x00010400,
0x00010400, 0x01010000, 0x01010000, 0x01000404,
0x00010004, 0x01000004, 0x01000004, 0x00010004,
0x00000000, 0x00000404, 0x00010404, 0x01000000,
0x00010000, 0x01010404, 0x00000004, 0x01010000,
0x01010400, 0x01000000, 0x01000000, 0x00000400,
0x01010004, 0x00010000, 0x00010400, 0x01000004,
0x00000400, 0x00000004, 0x01000404, 0x00010404,
0x01010404, 0x00010004, 0x01010000, 0x01000404,
0x01000004, 0x00000404, 0x00010404, 0x01010400,
0x00000404, 0x01000400, 0x01000400, 0x00000000,
0x00010004, 0x00010400, 0x00000000, 0x01010004 },
{ 0x80108020, 0x80008000, 0x00008000, 0x00108020,
0x00100000, 0x00000020, 0x80100020, 0x80008020,
0x80000020, 0x80108020, 0x80108000, 0x80000000,
0x80008000, 0x00100000, 0x00000020, 0x80100020,
0x00108000, 0x00100020, 0x80008020, 0x00000000,
0x80000000, 0x00008000, 0x00108020, 0x80100000,
0x00100020, 0x80000020, 0x00000000, 0x00108000,
0x00008020, 0x80108000, 0x80100000, 0x00008020,
0x00000000, 0x00108020, 0x80100020, 0x00100000,
0x80008020, 0x80100000, 0x80108000, 0x00008000,
0x80100000, 0x80008000, 0x00000020, 0x80108020,
0x00108020, 0x00000020, 0x00008000, 0x80000000,
0x00008020, 0x80108000, 0x00100000, 0x80000020,
0x00100020, 0x80008020, 0x80000020, 0x00100020,
0x00108000, 0x00000000, 0x80008000, 0x00008020,
0x80000000, 0x80100020, 0x80108020, 0x00108000 },
{ 0x00000208, 0x08020200, 0x00000000, 0x08020008,
0x08000200, 0x00000000, 0x00020208, 0x08000200,
0x00020008, 0x08000008, 0x08000008, 0x00020000,
0x08020208, 0x00020008, 0x08020000, 0x00000208,
0x08000000, 0x00000008, 0x08020200, 0x00000200,
0x00020200, 0x08020000, 0x08020008, 0x00020208,
0x08000208, 0x00020200, 0x00020000, 0x08000208,
0x00000008, 0x08020208, 0x00000200, 0x08000000,
0x08020200, 0x08000000, 0x00020008, 0x00000208,
0x00020000, 0x08020200, 0x08000200, 0x00000000,
0x00000200, 0x00020008, 0x08020208, 0x08000200,
0x08000008, 0x00000200, 0x00000000, 0x08020008,
0x08000208, 0x00020000, 0x08000000, 0x08020208,
0x00000008, 0x00020208, 0x00020200, 0x08000008,
0x08020000, 0x08000208, 0x00000208, 0x08020000,
0x00020208, 0x00000008, 0x08020008, 0x00020200 },
{ 0x00802001, 0x00002081, 0x00002081, 0x00000080,
0x00802080, 0x00800081, 0x00800001, 0x00002001,
0x00000000, 0x00802000, 0x00802000, 0x00802081,
0x00000081, 0x00000000, 0x00800080, 0x00800001,
0x00000001, 0x00002000, 0x00800000, 0x00802001,
0x00000080, 0x00800000, 0x00002001, 0x00002080,
0x00800081, 0x00000001, 0x00002080, 0x00800080,
0x00002000, 0x00802080, 0x00802081, 0x00000081,
0x00800080, 0x00800001, 0x00802000, 0x00802081,
0x00000081, 0x00000000, 0x00000000, 0x00802000,
0x00002080, 0x00800080, 0x00800081, 0x00000001,
0x00802001, 0x00002081, 0x00002081, 0x00000080,
0x00802081, 0x00000081, 0x00000001, 0x00002000,
0x00800001, 0x00002001, 0x00802080, 0x00800081,
0x00002001, 0x00002080, 0x00800000, 0x00802001,
0x00000080, 0x00800000, 0x00002000, 0x00802080 },
{ 0x00000100, 0x02080100, 0x02080000, 0x42000100,
0x00080000, 0x00000100, 0x40000000, 0x02080000,
0x40080100, 0x00080000, 0x02000100, 0x40080100,
0x42000100, 0x42080000, 0x00080100, 0x40000000,
0x02000000, 0x40080000, 0x40080000, 0x00000000,
0x40000100, 0x42080100, 0x42080100, 0x02000100,
0x42080000, 0x40000100, 0x00000000, 0x42000000,
0x02080100, 0x02000000, 0x42000000, 0x00080100,
0x00080000, 0x42000100, 0x00000100, 0x02000000,
0x40000000, 0x02080000, 0x42000100, 0x40080100,
0x02000100, 0x40000000, 0x42080000, 0x02080100,
0x40080100, 0x00000100, 0x02000000, 0x42080000,
0x42080100, 0x00080100, 0x42000000, 0x42080100,
0x02080000, 0x00000000, 0x40080000, 0x42000000,
0x00080100, 0x02000100, 0x40000100, 0x00080000,
0x00000000, 0x40080000, 0x02080100, 0x40000100 },
{ 0x20000010, 0x20400000, 0x00004000, 0x20404010,
0x20400000, 0x00000010, 0x20404010, 0x00400000,
0x20004000, 0x00404010, 0x00400000, 0x20000010,
0x00400010, 0x20004000, 0x20000000, 0x00004010,
0x00000000, 0x00400010, 0x20004010, 0x00004000,
0x00404000, 0x20004010, 0x00000010, 0x20400010,
0x20400010, 0x00000000, 0x00404010, 0x20404000,
0x00004010, 0x00404000, 0x20404000, 0x20000000,
0x20004000, 0x00000010, 0x20400010, 0x00404000,
0x20404010, 0x00400000, 0x00004010, 0x20000010,
0x00400000, 0x20004000, 0x20000000, 0x00004010,
0x20000010, 0x20404010, 0x00404000, 0x20400000,
0x00404010, 0x20404000, 0x00000000, 0x20400010,
0x00000010, 0x00004000, 0x20400000, 0x00404010,
0x00004000, 0x00400010, 0x20004010, 0x00000000,
0x20404000, 0x20000000, 0x00400010, 0x20004010 },
{ 0x00200000, 0x04200002, 0x04000802, 0x00000000,
0x00000800, 0x04000802, 0x00200802, 0x04200800,
0x04200802, 0x00200000, 0x00000000, 0x04000002,
0x00000002, 0x04000000, 0x04200002, 0x00000802,
0x04000800, 0x00200802, 0x00200002, 0x04000800,
0x04000002, 0x04200000, 0x04200800, 0x00200002,
0x04200000, 0x00000800, 0x00000802, 0x04200802,
0x00200800, 0x00000002, 0x04000000, 0x00200800,
0x04000000, 0x00200800, 0x00200000, 0x04000802,
0x04000802, 0x04200002, 0x04200002, 0x00000002,
0x00200002, 0x04000000, 0x04000800, 0x00200000,
0x04200800, 0x00000802, 0x00200802, 0x04200800,
0x00000802, 0x04000002, 0x04200802, 0x04200000,
0x00200800, 0x00000000, 0x00000002, 0x04200802,
0x00000000, 0x00200802, 0x04200000, 0x00000800,
0x04000002, 0x04000800, 0x00000800, 0x00200002 },
{ 0x10001040, 0x00001000, 0x00040000, 0x10041040,
0x10000000, 0x10001040, 0x00000040, 0x10000000,
0x00040040, 0x10040000, 0x10041040, 0x00041000,
0x10041000, 0x00041040, 0x00001000, 0x00000040,
0x10040000, 0x10000040, 0x10001000, 0x00001040,
0x00041000, 0x00040040, 0x10040040, 0x10041000,
0x00001040, 0x00000000, 0x00000000, 0x10040040,
0x10000040, 0x10001000, 0x00041040, 0x00040000,
0x00041040, 0x00040000, 0x10041000, 0x00001000,
0x00000040, 0x10040040, 0x00001000, 0x00041040,
0x10001000, 0x00000040, 0x10000040, 0x10040000,
0x10040040, 0x10000000, 0x00040000, 0x10001040,
0x00000000, 0x10041040, 0x00040040, 0x10000040,
0x10040000, 0x10001000, 0x10001040, 0x00000000,
0x10041040, 0x00041000, 0x00041000, 0x00001040,
0x00001040, 0x00040040, 0x10000000, 0x10041000 }
};
#undef F
#define F(l,r,key){\
work = ((r >> 4) | (r << 28)) ^ key[0];\
l ^= Spbox[6][work & 0x3f];\
l ^= Spbox[4][(work >> 8) & 0x3f];\
l ^= Spbox[2][(work >> 16) & 0x3f];\
l ^= Spbox[0][(work >> 24) & 0x3f];\
work = r ^ key[1];\
l ^= Spbox[7][work & 0x3f];\
l ^= Spbox[5][(work >> 8) & 0x3f];\
l ^= Spbox[3][(work >> 16) & 0x3f];\
l ^= Spbox[1][(work >> 24) & 0x3f];\
}
/* Encrypt or decrypt a block of data in ECB mode */
static void des (uint32_t ks[16][2], unsigned char block[8])
{
uint32_t left, right, work;
/* Read input block and place in left/right in big-endian order */
left = load_be32(block);
right = load_be32(block + 4);
/* Hoey's clever initial permutation algorithm, from Outerbridge
* (see Schneier p 478)
*
* The convention here is the same as Outerbridge: rotate each
* register left by 1 bit, i.e., so that "left" contains permuted
* input bits 2, 3, 4, ... 1 and "right" contains 33, 34, 35, ... 32
* (using origin-1 numbering as in the FIPS). This allows us to avoid
* one of the two rotates that would otherwise be required in each of
* the 16 rounds.
*/
work = ((left >> 4) ^ right) & 0x0f0f0f0f;
right ^= work;
left ^= work << 4;
work = ((left >> 16) ^ right) & 0xffff;
right ^= work;
left ^= work << 16;
work = ((right >> 2) ^ left) & 0x33333333;
left ^= work;
right ^= (work << 2);
work = ((right >> 8) ^ left) & 0xff00ff;
left ^= work;
right ^= (work << 8);
right = (right << 1) | (right >> 31);
work = (left ^ right) & 0xaaaaaaaa;
left ^= work;
right ^= work;
left = (left << 1) | (left >> 31);
/* Now do the 16 rounds */
F (left,right,ks[0]);
F (right,left,ks[1]);
F (left,right,ks[2]);
F (right,left,ks[3]);
F (left,right,ks[4]);
F (right,left,ks[5]);
F (left,right,ks[6]);
F (right,left,ks[7]);
F (left,right,ks[8]);
F (right,left,ks[9]);
F (left,right,ks[10]);
F (right,left,ks[11]);
F (left,right,ks[12]);
F (right,left,ks[13]);
F (left,right,ks[14]);
F (right,left,ks[15]);
/* Inverse permutation, also from Hoey via Outerbridge and Schneier */
right = (right << 31) | (right >> 1);
work = (left ^ right) & 0xaaaaaaaa;
left ^= work;
right ^= work;
left = (left >> 1) | (left << 31);
work = ((left >> 8) ^ right) & 0xff00ff;
right ^= work;
left ^= work << 8;
work = ((left >> 2) ^ right) & 0x33333333;
right ^= work;
left ^= work << 2;
work = ((right >> 16) ^ left) & 0xffff;
left ^= work;
right ^= work << 16;
work = ((right >> 4) ^ left) & 0x0f0f0f0f;
left ^= work;
right ^= work << 4;
/* Put the block back into the user's buffer with final swap */
store_be32(block, right);
store_be32(block + 4, left);
}
/* Key schedule-related tables from FIPS-46 */
/* permuted choice table (key) */
static const unsigned char pc1[] = {
57, 49, 41, 33, 25, 17, 9,
1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27,
19, 11, 3, 60, 52, 44, 36,
63, 55, 47, 39, 31, 23, 15,
7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29,
21, 13, 5, 28, 20, 12, 4
};
/* number left rotations of pc1 */
static const unsigned char totrot[] = {
1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28
};
/* permuted choice key (table) */
static const unsigned char pc2[] = {
14, 17, 11, 24, 1, 5,
3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8,
16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55,
30, 40, 51, 45, 33, 48,
44, 49, 39, 56, 34, 53,
46, 42, 50, 36, 29, 32
};
/* End of DES-defined tables */
/* bit 0 is left-most in byte */
static const int bytebit[] = {
0200,0100,040,020,010,04,02,01
};
/* Generate key schedule for encryption or decryption
* depending on the value of "decrypt"
*/
static void deskey (DES_KS k, unsigned char *key, int decrypt)
{
unsigned char pc1m[56]; /* place to modify pc1 into */
unsigned char pcr[56]; /* place to rotate pc1 into */
register int i,j,l;
int m;
unsigned char ks[8];
for (j=0; j<56; j++) { /* convert pc1 to bits of key */
l=pc1[j]-1; /* integer bit location */
m = l & 07; /* find bit */
pc1m[j]=(key[l>>3] & /* find which key byte l is in */
bytebit[m]) /* and which bit of that byte */
? 1 : 0; /* and store 1-bit result */
}
for (i=0; i<16; i++) { /* key chunk for each iteration */
memset (ks,0,sizeof (ks)); /* Clear key schedule */
for (j=0; j<56; j++) /* rotate pc1 the right amount */
pcr[j] = pc1m[(l = j + totrot[decrypt? 15 - i : i]) < (j < 28? 28 : 56) ? l: l - 28];
/* rotate left and right halves independently */
for (j=0; j<48; j++){ /* select bits individually */
/* check bit that goes to ks[j] */
if (pcr[pc2[j]-1]) {
/* mask it in if it's there */
l= j % 6;
ks[j / 6] |= bytebit[l] >> 2;
}
}
/* Now convert to packed odd/even interleaved form */
k[i][0] = ((uint32_t) ks[0] << 24)
| ((uint32_t) ks[2] << 16)
| ((uint32_t) ks[4] << 8)
| ((uint32_t) ks[6]);
k[i][1] = ((uint32_t) ks[1] << 24)
| ((uint32_t) ks[3] << 16)
| ((uint32_t) ks[5] << 8)
| ((uint32_t) ks[7]);
}
}
#define HIKEYBITS(k,s) ((k[(s) / 8] << ((s) % 8)) & 0xFF)
#define LOKEYBITS(k,s) (k[(s) / 8 + 1] >> (8 - (s) % 8))
/* DES utils */
/* Set up a key schedule based on a 56bit key */
static void setup_schedule (const unsigned char *key_56, DES_KS ks)
{
unsigned char key[8];
int i, c, bit;
for (i = 0; i < 8; i++) {
key[i] = HIKEYBITS (key_56, i * 7);
/* Mask in the low bits only if they're used. It doesn't
* matter if we get an unwanted bit 0; it's going to be
* overwritten with parity anyway. */
if (i && i < 7)
key[i] |= LOKEYBITS(key_56, i * 7);
/* Fix parity */
for (c = bit = 0; bit < 8; bit++)
if (key[i] & (1 << bit))
c++;
if (!(c & 1))
key[i] ^= 0x01;
}
deskey (ks, key, 0);
}
#define LM_PASSWORD_MAGIC "\x4B\x47\x53\x21\x40\x23\x24\x25" \
"\x4B\x47\x53\x21\x40\x23\x24\x25" \
"\x00\x00\x00\x00\x00"
static void ntlm_lanmanager_hash (const char *password, char hash[21])
{
unsigned char lm_password[15];
DES_KS ks;
int i;
for (i = 0; i < 14 && password[i]; i++)
lm_password[i] = toupper ((unsigned char) password[i]);
for (; i < 15; i++)
lm_password[i] = '\0';
memcpy (hash, LM_PASSWORD_MAGIC, 21);
setup_schedule (lm_password, ks);
des (ks, (unsigned char *) hash);
setup_schedule (lm_password + 7, ks);
des (ks, (unsigned char *) hash + 8);
memset(lm_password, 0, sizeof(lm_password));
}
static int ntlm_nt_hash (const char *pass, char hash[21])
{
struct oc_text_buf *utf16pass = buf_alloc();
int ret;
/* Preallocate just to ensure md4sum() doesn't have to realloc, which
would leave a copy of the password lying around. There is always
at least one byte of padding, then 8 bytes of length, and round up
to the next multiple of 64. */
ret = buf_ensure_space(utf16pass, ((strlen(pass) * 2) + 1 + 8 + 63) & ~63);
if (ret)
goto out;
ret = buf_append_utf16le(utf16pass, pass);
if (ret < 0)
goto wipe;
ret = buf_error(utf16pass);
if (ret)
goto wipe;
ret = md4sum(utf16pass, (unsigned char *) hash);
if (ret)
goto wipe;
memset(hash + 16, 0, 5);
wipe:
memset(utf16pass->data, 0, utf16pass->pos);
out:
buf_free(utf16pass);
return 0;
}
static void ntlm_calc_response (const unsigned char key[21],
const unsigned char plaintext[8],
unsigned char results[24])
{
DES_KS ks;
memcpy (results, plaintext, 8);
memcpy (results + 8, plaintext, 8);
memcpy (results + 16, plaintext, 8);
setup_schedule (key, ks);
des (ks, results);
setup_schedule (key + 7, ks);
des (ks, results + 8);
setup_schedule (key + 14, ks);
des (ks, results + 16);
}
#define NTLM_CHALLENGE_DOMAIN_OFFSET 12
#define NTLM_CHALLENGE_FLAGS_OFFSET 20
#define NTLM_CHALLENGE_NONCE_OFFSET 24
#define NTLM_RESPONSE_BASE_SIZE 64
#define NTLM_RESPONSE_LM_RESP_OFFSET 12
#define NTLM_RESPONSE_NT_RESP_OFFSET 20
#define NTLM_RESPONSE_DOMAIN_OFFSET 28
#define NTLM_RESPONSE_USER_OFFSET 36
#define NTLM_RESPONSE_HOST_OFFSET 44
#define NTLM_RESPONSE_FLAGS_OFFSET 60
static const char ntlm_response_base[NTLM_RESPONSE_BASE_SIZE] = {
'N', 'T', 'L', 'M', 'S', 'S', 'P', 0x00,
0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x82, 0x01, 0x00, 0x00
};
static void ntlm_set_string_utf8(struct oc_text_buf *buf, int offset,
const char *data)
{
int oldpos = buf->pos;
int len = buf_append_utf16le(buf, data);
/* Fill in the SecurityBuffer pointing to the string */
store_le16(buf->data + offset, len); /* len */
store_le16(buf->data + offset + 2, len); /* allocated */
store_le32(buf->data + offset + 4, oldpos); /* offset */
}
static void ntlm_set_string_binary(struct oc_text_buf *buf, int offset,
const void *data, int len)
{
/* Fill in the SecurityBuffer pointing to the string */
store_le16(buf->data + offset, len); /* len */
store_le16(buf->data + offset + 2, len); /* allocated */
store_le32(buf->data + offset + 4, buf->pos); /* offset */
buf_append_bytes(buf, data, len);
}
static int ntlm_manual_challenge(struct openconnect_info *vpninfo, int proxy,
struct http_auth_state *auth_state,
struct oc_text_buf *hdrbuf,
const char *domuser, const char *pass)
{
struct oc_text_buf *resp;
char *user;
unsigned char nonce[8], hash[21], lm_resp[24], nt_resp[24];
unsigned char *token;
int token_len = -EINVAL;
int ntlmver;
memset(hash, 0, sizeof(hash));
if (!auth_state->challenge)
return -EINVAL;
if (ntlm_nt_hash (pass, (char *) hash))
return -EINVAL;
token = openconnect_base64_decode(&token_len,
auth_state->challenge);
if (!token)
return token_len;
if (token_len < NTLM_CHALLENGE_NONCE_OFFSET + 8 || token[0] != 'N' ||
token[1] != 'T' || token[2] != 'L' || token[3] != 'M' ||
token[4] != 'S' || token[5] != 'S' || token[6] != 'P' ||
token[7] || token[8] != 2 || token[9] || token[10] || token[11]) {
free(token);
return -EINVAL;
}
/* 0x00080000: Negotiate NTLM2 Key */
if (token[NTLM_CHALLENGE_FLAGS_OFFSET + 2] & 8) {
/* NTLM2 session response */
struct {
uint32_t srv[2];
uint32_t clnt[2];
} sess_nonce;
unsigned char digest[16];
ntlmver = 2;
if (openconnect_random(sess_nonce.clnt, sizeof(sess_nonce.clnt))) {
free(token);
return -EIO;
}
/* LM response is 8-byte client nonce, NUL-padded to 24 */
memcpy (lm_resp, sess_nonce.clnt, 8);
memset (lm_resp + 8, 0, 16);
/* Session nonce is client nonce + server nonce */
memcpy (sess_nonce.srv,
token + NTLM_CHALLENGE_NONCE_OFFSET, 8);
/* Take MD5 of session nonce */
if (openconnect_md5(digest, &sess_nonce, sizeof(sess_nonce))) {
free(token);
return -EIO;
}
ntlm_calc_response (hash, digest, nt_resp);
} else {
/* NTLM1 */
ntlmver = 1;
memcpy (nonce, token + NTLM_CHALLENGE_NONCE_OFFSET, 8);
ntlm_calc_response (hash, nonce, nt_resp);
ntlm_lanmanager_hash (pass, (char *) hash);
ntlm_calc_response (hash, nonce, lm_resp);
}
resp = buf_alloc();
buf_append_bytes(resp, ntlm_response_base, sizeof(ntlm_response_base));
if (buf_error(resp)) {
free(token);
return buf_free(resp);
}
/* Mask in the NTLM2SESSION flag */
resp->data[NTLM_RESPONSE_FLAGS_OFFSET + 2] = token[NTLM_CHALLENGE_FLAGS_OFFSET + 2] & 8;
user = strchr(domuser, '\\');
if (user) {
*user = 0;
ntlm_set_string_utf8(resp, NTLM_RESPONSE_DOMAIN_OFFSET, domuser);
*user = '\\';
user++;
} else {
int offset = load_le32(token + NTLM_CHALLENGE_DOMAIN_OFFSET + 4);
int len = load_le16(token + NTLM_CHALLENGE_DOMAIN_OFFSET);
if (!len || offset + len >= token_len) {
free(token);
buf_free(resp);
return -EINVAL;
}
ntlm_set_string_binary(resp, NTLM_RESPONSE_DOMAIN_OFFSET, token + offset, len);
user = (char *)domuser;
}
ntlm_set_string_utf8(resp, NTLM_RESPONSE_USER_OFFSET, user);
ntlm_set_string_utf8(resp, NTLM_RESPONSE_HOST_OFFSET, "UNKNOWN");
ntlm_set_string_binary(resp, NTLM_RESPONSE_LM_RESP_OFFSET, lm_resp, sizeof(lm_resp));
ntlm_set_string_binary(resp, NTLM_RESPONSE_NT_RESP_OFFSET, nt_resp, sizeof(nt_resp));
free(token);
if (buf_error(resp))
return buf_free(resp);
buf_append(hdrbuf, "%sAuthorization: NTLM ", proxy ? "Proxy-" : "");
buf_append_base64(hdrbuf, resp->data, resp->pos);
buf_append(hdrbuf, "\r\n");
buf_free(resp);
if (proxy)
vpn_progress(vpninfo, PRG_INFO,
_("Attempting HTTP NTLMv%d authentication to proxy\n"),
ntlmver);
else
vpn_progress(vpninfo, PRG_INFO,
_("Attempting HTTP NTLMv%d authentication to server '%s'\n"),
ntlmver, vpninfo->hostname);
return 0;
}
int ntlm_authorization(struct openconnect_info *vpninfo, int proxy,
struct http_auth_state *auth_state, struct oc_text_buf *buf)
{
const char *user, *pass;
if (proxy) {
user = vpninfo->proxy_user;
pass = vpninfo->proxy_pass;
} else {
user = pass = NULL;
}