/
rlm_mschap.c
2001 lines (1726 loc) · 53.7 KB
/
rlm_mschap.c
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/*
* This program is 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.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* $Id$
* @file rlm_mschap.c
* @brief Implemented mschap authentication.
*
* @copyright 2000,2001,2006 The FreeRADIUS server project
*/
/* MPPE support from Takahiro Wagatsuma <waga@sic.shibaura-it.ac.jp> */
RCSID("$Id$")
#include <freeradius-devel/radiusd.h>
#include <freeradius-devel/modules.h>
#include <freeradius-devel/rad_assert.h>
#include <freeradius-devel/md5.h>
#include <freeradius-devel/sha1.h>
#include <ctype.h>
#include "rlm_mschap.h"
#include "mschap.h"
#include "smbdes.h"
#include "auth_wbclient.h"
#ifdef HAVE_OPENSSL_CRYPTO_H
USES_APPLE_DEPRECATED_API /* OpenSSL API has been deprecated by Apple */
# include <openssl/rc4.h>
#endif
#ifdef WITH_OPEN_DIRECTORY
int od_mschap_auth(REQUEST *request, VALUE_PAIR *challenge, VALUE_PAIR * usernamepair);
#endif
/* Allowable account control bits */
#define ACB_DISABLED 0x00010000 //!< User account disabled.
#define ACB_HOMDIRREQ 0x00020000 //!< Home directory required.
#define ACB_PWNOTREQ 0x00040000 //!< User password not required.
#define ACB_TEMPDUP 0x00080000 //!< Temporary duplicate account.
#define ACB_NORMAL 0x00100000 //!< Normal user account.
#define ACB_MNS 0x00200000 //!< MNS logon user account.
#define ACB_DOMTRUST 0x00400000 //!< Interdomain trust account.
#define ACB_WSTRUST 0x00800000 //!< Workstation trust account.
#define ACB_SVRTRUST 0x01000000 //!< Server trust account.
#define ACB_PWNOEXP 0x02000000 //!< User password does not expire.
#define ACB_AUTOLOCK 0x04000000 //!< Account auto locked.
#define ACB_PW_EXPIRED 0x00020000 //!< Password Expired.
static int pdb_decode_acct_ctrl(char const *p)
{
int acct_ctrl = 0;
int done = 0;
/*
* Check if the account type bits have been encoded after the
* NT password (in the form [NDHTUWSLXI]).
*/
if (*p != '[') return 0;
for (p++; *p && !done; p++) {
switch (*p) {
case 'N': /* 'N'o password. */
acct_ctrl |= ACB_PWNOTREQ;
break;
case 'D': /* 'D'isabled. */
acct_ctrl |= ACB_DISABLED ;
break;
case 'H': /* 'H'omedir required. */
acct_ctrl |= ACB_HOMDIRREQ;
break;
case 'T': /* 'T'emp account. */
acct_ctrl |= ACB_TEMPDUP;
break;
case 'U': /* 'U'ser account (normal). */
acct_ctrl |= ACB_NORMAL;
break;
case 'M': /* 'M'NS logon user account. What is this? */
acct_ctrl |= ACB_MNS;
break;
case 'W': /* 'W'orkstation account. */
acct_ctrl |= ACB_WSTRUST;
break;
case 'S': /* 'S'erver account. */
acct_ctrl |= ACB_SVRTRUST;
break;
case 'L': /* 'L'ocked account. */
acct_ctrl |= ACB_AUTOLOCK;
break;
case 'X': /* No 'X'piry on password */
acct_ctrl |= ACB_PWNOEXP;
break;
case 'I': /* 'I'nterdomain trust account. */
acct_ctrl |= ACB_DOMTRUST;
break;
case 'e': /* 'e'xpired, the password has */
acct_ctrl |= ACB_PW_EXPIRED;
break;
case ' ': /* ignore spaces */
break;
case ':':
case '\n':
case '\0':
case ']':
default:
done = 1;
break;
}
}
return acct_ctrl;
}
/*
* Does dynamic translation of strings.
*
* Pulls NT-Response, LM-Response, or Challenge from MSCHAP
* attributes.
*/
static ssize_t mschap_xlat(void *instance, REQUEST *request,
char const *fmt, char *out, size_t outlen)
{
size_t i, data_len;
uint8_t const *data = NULL;
uint8_t buffer[32];
VALUE_PAIR *user_name;
VALUE_PAIR *chap_challenge, *response;
rlm_mschap_t *inst = instance;
response = NULL;
/*
* Challenge means MS-CHAPv1 challenge, or
* hash of MS-CHAPv2 challenge, and peer challenge.
*/
if (strncasecmp(fmt, "Challenge", 9) == 0) {
chap_challenge = pairfind(request->packet->vps, PW_MSCHAP_CHALLENGE, VENDORPEC_MICROSOFT, TAG_ANY);
if (!chap_challenge) {
REDEBUG("No MS-CHAP-Challenge in the request");
return -1;
}
/*
* MS-CHAP-Challenges are 8 octets,
* for MS-CHAPv1
*/
if (chap_challenge->vp_length == 8) {
RDEBUG2("mschap1: %02x", chap_challenge->vp_octets[0]);
data = chap_challenge->vp_octets;
data_len = 8;
/*
* MS-CHAP-Challenges are 16 octets,
* for MS-CHAPv2.
*/
} else if (chap_challenge->vp_length == 16) {
VALUE_PAIR *name_attr, *response_name;
char const *username_string;
response = pairfind(request->packet->vps, PW_MSCHAP2_RESPONSE, VENDORPEC_MICROSOFT, TAG_ANY);
if (!response) {
REDEBUG("MS-CHAP2-Response is required to calculate MS-CHAPv1 challenge");
return -1;
}
/*
* FIXME: Much of this is copied from
* below. We should put it into a
* separate function.
*/
/*
* Responses are 50 octets.
*/
if (response->vp_length < 50) {
REDEBUG("MS-CHAP-Response has the wrong format");
return -1;
}
user_name = pairfind(request->packet->vps, PW_USER_NAME, 0, TAG_ANY);
if (!user_name) {
REDEBUG("User-Name is required to calculate MS-CHAPv1 Challenge");
return -1;
}
/*
* Check for MS-CHAP-User-Name and if found, use it
* to construct the MSCHAPv1 challenge. This is
* set by rlm_eap_mschap to the MS-CHAP Response
* packet Name field.
*
* We prefer this to the User-Name in the
* packet.
*/
response_name = pairfind(request->packet->vps, PW_MS_CHAP_USER_NAME, 0, TAG_ANY);
if (response_name) {
name_attr = response_name;
} else {
name_attr = user_name;
}
/*
* with_ntdomain_hack moved here, too.
*/
if ((username_string = strchr(name_attr->vp_strvalue, '\\')) != NULL) {
if (inst->with_ntdomain_hack) {
username_string++;
} else {
RWDEBUG2("NT Domain delimiter found, should we have enabled with_ntdomain_hack?");
username_string = name_attr->vp_strvalue;
}
} else {
username_string = name_attr->vp_strvalue;
}
if (response_name &&
((user_name->vp_length != response_name->vp_length) ||
(strncasecmp(user_name->vp_strvalue, response_name->vp_strvalue,
user_name->vp_length) != 0))) {
RWDEBUG2("User-Name (%s) is not the same as MS-CHAP Name (%s) from EAP-MSCHAPv2",
user_name->vp_strvalue, response_name->vp_strvalue);
}
/*
* Get the MS-CHAPv1 challenge
* from the MS-CHAPv2 peer challenge,
* our challenge, and the user name.
*/
RDEBUG2("Creating challenge hash with username: %s", username_string);
mschap_challenge_hash(response->vp_octets + 2,
chap_challenge->vp_octets,
username_string, buffer);
data = buffer;
data_len = 8;
} else {
REDEBUG("Invalid MS-CHAP challenge length");
return -1;
}
/*
* Get the MS-CHAPv1 response, or the MS-CHAPv2
* response.
*/
} else if (strncasecmp(fmt, "NT-Response", 11) == 0) {
response = pairfind(request->packet->vps, PW_MSCHAP_RESPONSE, VENDORPEC_MICROSOFT, TAG_ANY);
if (!response) response = pairfind(request->packet->vps, PW_MSCHAP2_RESPONSE, VENDORPEC_MICROSOFT, TAG_ANY);
if (!response) {
REDEBUG("No MS-CHAP-Response or MS-CHAP2-Response was found in the request");
return -1;
}
/*
* For MS-CHAPv1, the NT-Response exists only
* if the second octet says so.
*/
if ((response->da->vendor == VENDORPEC_MICROSOFT) &&
(response->da->attr == PW_MSCHAP_RESPONSE) &&
((response->vp_octets[1] & 0x01) == 0)) {
REDEBUG("No NT-Response in MS-CHAP-Response");
return -1;
}
/*
* MS-CHAP-Response and MS-CHAP2-Response have
* the NT-Response at the same offset, and are
* the same length.
*/
data = response->vp_octets + 26;
data_len = 24;
/*
* LM-Response is deprecated, and exists only
* in MS-CHAPv1, and not often there.
*/
} else if (strncasecmp(fmt, "LM-Response", 11) == 0) {
response = pairfind(request->packet->vps, PW_MSCHAP_RESPONSE, VENDORPEC_MICROSOFT, TAG_ANY);
if (!response) {
REDEBUG("No MS-CHAP-Response was found in the request");
return -1;
}
/*
* For MS-CHAPv1, the LM-Response exists only
* if the second octet says so.
*/
if ((response->vp_octets[1] & 0x01) != 0) {
REDEBUG("No LM-Response in MS-CHAP-Response");
return -1;
}
data = response->vp_octets + 2;
data_len = 24;
/*
* Pull the NT-Domain out of the User-Name, if it exists.
*/
} else if (strncasecmp(fmt, "NT-Domain", 9) == 0) {
char *p, *q;
user_name = pairfind(request->packet->vps, PW_USER_NAME, 0, TAG_ANY);
if (!user_name) {
REDEBUG("No User-Name was found in the request");
return -1;
}
/*
* First check to see if this is a host/ style User-Name
* (a la Kerberos host principal)
*/
if (strncmp(user_name->vp_strvalue, "host/", 5) == 0) {
/*
* If we're getting a User-Name formatted in this way,
* it's likely due to PEAP. The Windows Domain will be
* the first domain component following the hostname,
* or the machine name itself if only a hostname is supplied
*/
p = strchr(user_name->vp_strvalue, '.');
if (!p) {
RDEBUG2("setting NT-Domain to same as machine name");
strlcpy(out, user_name->vp_strvalue + 5, outlen);
} else {
p++; /* skip the period */
q = strchr(p, '.');
/*
* use the same hack as below
* only if another period was found
*/
if (q) *q = '\0';
strlcpy(out, p, outlen);
if (q) *q = '.';
}
} else {
p = strchr(user_name->vp_strvalue, '\\');
if (!p) {
REDEBUG("No NT-Domain was found in the User-Name");
return -1;
}
/*
* Hack. This is simpler than the alternatives.
*/
*p = '\0';
strlcpy(out, user_name->vp_strvalue, outlen);
*p = '\\';
}
return strlen(out);
/*
* Pull the User-Name out of the User-Name...
*/
} else if (strncasecmp(fmt, "User-Name", 9) == 0) {
char const *p, *q;
user_name = pairfind(request->packet->vps, PW_USER_NAME, 0, TAG_ANY);
if (!user_name) {
REDEBUG("No User-Name was found in the request");
return -1;
}
/*
* First check to see if this is a host/ style User-Name
* (a la Kerberos host principal)
*/
if (strncmp(user_name->vp_strvalue, "host/", 5) == 0) {
p = user_name->vp_strvalue + 5;
/*
* If we're getting a User-Name formatted in this way,
* it's likely due to PEAP. When authenticating this against
* a Domain, Windows will expect the User-Name to be in the
* format of hostname$, the SAM version of the name, so we
* have to convert it to that here. We do so by stripping
* off the first 5 characters (host/), and copying everything
* from that point to the first period into a string and appending
* a $ to the end.
*/
q = strchr(p, '.');
/*
* use the same hack as above
* only if a period was found
*/
if (q) {
snprintf(out, outlen, "%.*s$",
(int) (q - p), p);
} else {
snprintf(out, outlen, "%s$", p);
}
} else {
p = strchr(user_name->vp_strvalue, '\\');
if (p) {
p++; /* skip the backslash */
} else {
p = user_name->vp_strvalue; /* use the whole User-Name */
}
strlcpy(out, p, outlen);
}
return strlen(out);
/*
* Return the NT-Hash of the passed string
*/
} else if (strncasecmp(fmt, "NT-Hash ", 8) == 0) {
char const *p;
p = fmt + 8; /* 7 is the length of 'NT-Hash' */
if ((p == '\0') || (outlen <= 32))
return 0;
while (isspace(*p)) p++;
if (mschap_ntpwdhash(buffer, p) < 0) {
REDEBUG("Failed generating NT-Password");
*buffer = '\0';
return -1;
}
fr_bin2hex(out, buffer, NT_DIGEST_LENGTH);
out[32] = '\0';
RDEBUG("NT-Hash of \"known-good\" password: %s", out);
return 32;
/*
* Return the LM-Hash of the passed string
*/
} else if (strncasecmp(fmt, "LM-Hash ", 8) == 0) {
char const *p;
p = fmt + 8; /* 7 is the length of 'LM-Hash' */
if ((p == '\0') || (outlen <= 32))
return 0;
while (isspace(*p)) p++;
smbdes_lmpwdhash(p, buffer);
fr_bin2hex(out, buffer, LM_DIGEST_LENGTH);
out[32] = '\0';
RDEBUG("LM-Hash of %s = %s", p, out);
return 32;
} else {
REDEBUG("Unknown expansion string '%s'", fmt);
return -1;
}
if (outlen == 0) return 0; /* nowhere to go, don't do anything */
/*
* Didn't set anything: this is bad.
*/
if (!data) {
RWDEBUG2("Failed to do anything intelligent");
return 0;
}
/*
* Check the output length.
*/
if (outlen < ((data_len * 2) + 1)) {
data_len = (outlen - 1) / 2;
}
/*
*
*/
for (i = 0; i < data_len; i++) {
sprintf(out + (2 * i), "%02x", data[i]);
}
out[data_len * 2] = '\0';
return data_len * 2;
}
#ifdef WITH_AUTH_WINBIND
/*
* Free connection pool winbind context
*/
static int _mod_conn_free(struct wbcContext **wb_ctx)
{
wbcCtxFree(*wb_ctx);
return 0;
}
/*
* Create connection pool winbind context
*/
static void *mod_conn_create(TALLOC_CTX *ctx, UNUSED void *instance)
{
struct wbcContext **wb_ctx;
wb_ctx = talloc_zero(ctx, struct wbcContext *);
*wb_ctx = wbcCtxCreate();
if (*wb_ctx == NULL) {
ERROR("failed to create winbind context");
talloc_free(wb_ctx);
return NULL;
}
talloc_set_destructor(wb_ctx, _mod_conn_free);
return *wb_ctx;
}
#endif
static const CONF_PARSER passchange_config[] = {
{ "ntlm_auth", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_XLAT, rlm_mschap_t, ntlm_cpw), NULL },
{ "ntlm_auth_username", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_XLAT, rlm_mschap_t, ntlm_cpw_username), NULL },
{ "ntlm_auth_domain", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_XLAT, rlm_mschap_t, ntlm_cpw_domain), NULL },
{ "local_cpw", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_XLAT, rlm_mschap_t, local_cpw), NULL },
{ NULL, -1, 0, NULL, NULL } /* end the list */
};
static const CONF_PARSER module_config[] = {
/*
* Cache the password by default.
*/
{ "use_mppe", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, rlm_mschap_t, use_mppe), "yes" },
{ "require_encryption", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, rlm_mschap_t, require_encryption), "no" },
{ "require_strong", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, rlm_mschap_t, require_strong), "no" },
{ "with_ntdomain_hack", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, rlm_mschap_t, with_ntdomain_hack), "yes" },
{ "ntlm_auth", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_XLAT, rlm_mschap_t, ntlm_auth), NULL },
{ "ntlm_auth_timeout", FR_CONF_OFFSET(PW_TYPE_INTEGER, rlm_mschap_t, ntlm_auth_timeout), NULL },
{ "passchange", FR_CONF_POINTER(PW_TYPE_SUBSECTION, NULL), (void const *) passchange_config },
{ "allow_retry", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, rlm_mschap_t, allow_retry), "yes" },
{ "retry_msg", FR_CONF_OFFSET(PW_TYPE_STRING, rlm_mschap_t, retry_msg), NULL },
{ "winbind_username", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_TMPL, rlm_mschap_t, wb_username), NULL },
{ "winbind_domain", FR_CONF_OFFSET(PW_TYPE_STRING | PW_TYPE_TMPL, rlm_mschap_t, wb_domain), NULL },
#ifdef WITH_OPEN_DIRECTORY
{ "use_open_directory", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, rlm_mschap_t, open_directory), "yes" },
#endif
{ NULL, -1, 0, NULL, NULL } /* end the list */
};
static int mod_bootstrap(CONF_SECTION *conf, void *instance)
{
char const *name;
rlm_mschap_t *inst = instance;
/*
* Create the dynamic translation.
*/
name = cf_section_name2(conf);
if (!name) name = cf_section_name1(conf);
inst->xlat_name = name;
xlat_register(inst->xlat_name, mschap_xlat, NULL, inst);
return 0;
}
/*
* Create instance for our module. Allocate space for
* instance structure and read configuration parameters
*/
static int mod_instantiate(CONF_SECTION *conf, void *instance)
{
rlm_mschap_t *inst = instance;
/*
* For backwards compatibility
*/
if (!dict_valbyname(PW_AUTH_TYPE, 0, inst->xlat_name)) {
inst->auth_type = "MS-CHAP";
} else {
inst->auth_type = inst->xlat_name;
}
/*
* Set auth method
*/
inst->method = AUTH_INTERNAL;
if (inst->wb_username) {
#ifdef WITH_AUTH_WINBIND
inst->method = AUTH_WBCLIENT;
inst->wb_pool = fr_connection_pool_module_init(conf, inst, mod_conn_create, NULL, NULL);
if (!inst->wb_pool) {
cf_log_err_cs(conf, "Unable to initialise winbind connection pool");
return -1;
}
#else
cf_log_err_cs(conf, "'winbind' auth not enabled at compiled time");
return -1;
#endif
}
/* preserve existing behaviour: this option overrides all */
if (inst->ntlm_auth) {
inst->method = AUTH_NTLMAUTH_EXEC;
}
switch (inst->method) {
case AUTH_INTERNAL:
DEBUG("rlm_mschap (%s): using internal authentication", inst->xlat_name);
break;
case AUTH_NTLMAUTH_EXEC:
DEBUG("rlm_mschap (%s): authenticating by calling 'ntlm_auth'", inst->xlat_name);
break;
#ifdef WITH_AUTH_WINBIND
case AUTH_WBCLIENT:
DEBUG("rlm_mschap (%s): authenticating directly to winbind", inst->xlat_name);
break;
#endif
}
/*
* Check ntlm_auth_timeout is sane
*/
if (!inst->ntlm_auth_timeout) {
inst->ntlm_auth_timeout = EXEC_TIMEOUT;
}
if (inst->ntlm_auth_timeout < 1) {
cf_log_err_cs(conf, "ntml_auth_timeout '%d' is too small (minimum: 1)",
inst->ntlm_auth_timeout);
return -1;
}
if (inst->ntlm_auth_timeout > 10) {
cf_log_err_cs(conf, "ntlm_auth_timeout '%d' is too large (maximum: 10)",
inst->ntlm_auth_timeout);
return -1;
}
return 0;
}
/*
* Tidy up instance
*/
static int mod_detach(UNUSED void *instance)
{
#ifdef WITH_AUTH_WINBIND
rlm_mschap_t *inst = instance;
fr_connection_pool_free(inst->wb_pool);
#endif
return 0;
}
/*
* add_reply() adds either MS-CHAP2-Success or MS-CHAP-Error
* attribute to reply packet
*/
void mschap_add_reply(REQUEST *request, unsigned char ident,
char const *name, char const *value, size_t len)
{
VALUE_PAIR *vp;
vp = pairmake_reply(name, NULL, T_OP_EQ);
if (!vp) {
REDEBUG("Failed to create attribute %s: %s", name, fr_strerror());
return;
}
/* Account for the ident byte */
vp->vp_length = len + 1;
if (vp->da->type == PW_TYPE_STRING) {
char *p;
vp->vp_strvalue = p = talloc_array(vp, char, vp->vp_length + 1);
p[vp->vp_length] = '\0'; /* Always \0 terminate */
p[0] = ident;
memcpy(p + 1, value, len);
} else {
uint8_t *p;
vp->vp_octets = p = talloc_array(vp, uint8_t, vp->vp_length);
p[0] = ident;
memcpy(p + 1, value, len);
}
}
/*
* Add MPPE attributes to the reply.
*/
static void mppe_add_reply(REQUEST *request, char const* name, uint8_t const * value, size_t len)
{
VALUE_PAIR *vp;
vp = pairmake_reply(name, NULL, T_OP_EQ);
if (!vp) {
REDEBUG("mppe_add_reply failed to create attribute %s: %s", name, fr_strerror());
return;
}
pairmemcpy(vp, value, len);
}
static int write_all(int fd, char const *buf, int len) {
int rv,done=0;
while (done < len) {
rv = write(fd, buf+done, len-done);
if (rv <= 0)
break;
done += rv;
}
return done;
}
/*
* Perform an MS-CHAP2 password change
*/
static int CC_HINT(nonnull (1, 2, 4, 5)) do_mschap_cpw(rlm_mschap_t *inst,
REQUEST *request,
#ifdef HAVE_OPENSSL_CRYPTO_H
VALUE_PAIR *nt_password,
#else
UNUSED VALUE_PAIR *nt_password,
#endif
uint8_t *new_nt_password,
uint8_t *old_nt_hash,
MSCHAP_AUTH_METHOD method)
{
if (inst->ntlm_cpw && method != AUTH_INTERNAL) {
/*
* we're going to run ntlm_auth in helper-mode
* we're expecting to use the ntlm-change-password-1 protocol
* which needs the following on stdin:
*
* username: %{mschap:User-Name}
* nt-domain: %{mschap:NT-Domain}
* new-nt-password-blob: bin2hex(new_nt_password) - 1032 bytes encoded
* old-nt-hash-blob: bin2hex(old_nt_hash) - 32 bytes encoded
* new-lm-password-blob: 00000...0000 - 1032 bytes null
* old-lm-hash-blob: 000....000 - 32 bytes null
* .\n
*
* ...and it should then print out
*
* Password-Change: Yes
*
* or
*
* Password-Change: No
* Password-Change-Error: blah
*/
int to_child=-1;
int from_child=-1;
pid_t pid, child_pid;
int status, len;
char buf[2048];
char *pmsg;
char const *emsg;
RDEBUG("Doing MS-CHAPv2 password change via ntlm_auth helper");
/*
* Start up ntlm_auth with a pipe on stdin and stdout
*/
pid = radius_start_program(inst->ntlm_cpw, request, true, &to_child, &from_child, NULL, false);
if (pid < 0) {
REDEBUG("could not exec ntlm_auth cpw command");
return -1;
}
/*
* write the stuff to the client
*/
if (inst->ntlm_cpw_username) {
len = radius_xlat(buf, sizeof(buf) - 2, request, inst->ntlm_cpw_username, NULL, NULL);
if (len < 0) {
goto ntlm_auth_err;
}
buf[len++] = '\n';
buf[len] = '\0';
if (write_all(to_child, buf, len) != len) {
REDEBUG("Failed to write username to child");
goto ntlm_auth_err;
}
} else {
RWDEBUG2("No ntlm_auth username set, passchange will definitely fail!");
}
if (inst->ntlm_cpw_domain) {
len = radius_xlat(buf, sizeof(buf) - 2, request, inst->ntlm_cpw_domain, NULL, NULL);
if (len < 0) {
goto ntlm_auth_err;
}
buf[len++] = '\n';
buf[len] = '\0';
if (write_all(to_child, buf, len) != len) {
REDEBUG("Failed to write domain to child");
goto ntlm_auth_err;
}
} else {
RWDEBUG2("No ntlm_auth domain set, username must be full-username to work");
}
/* now the password blobs */
len = sprintf(buf, "new-nt-password-blob: ");
fr_bin2hex(buf+len, new_nt_password, 516);
buf[len+1032] = '\n';
buf[len+1033] = '\0';
len = strlen(buf);
if (write_all(to_child, buf, len) != len) {
RDEBUG2("failed to write new password blob to child");
goto ntlm_auth_err;
}
len = sprintf(buf, "old-nt-hash-blob: ");
fr_bin2hex(buf+len, old_nt_hash, NT_DIGEST_LENGTH);
buf[len+32] = '\n';
buf[len+33] = '\0';
len = strlen(buf);
if (write_all(to_child, buf, len) != len) {
REDEBUG("Failed to write old hash blob to child");
goto ntlm_auth_err;
}
/*
* In current samba versions, failure to supply empty LM password/hash
* blobs causes the change to fail.
*/
len = sprintf(buf, "new-lm-password-blob: %01032i\n", 0);
if (write_all(to_child, buf, len) != len) {
REDEBUG("Failed to write dummy LM password to child");
goto ntlm_auth_err;
}
len = sprintf(buf, "old-lm-hash-blob: %032i\n", 0);
if (write_all(to_child, buf, len) != len) {
REDEBUG("Failed to write dummy LM hash to child");
goto ntlm_auth_err;
}
if (write_all(to_child, ".\n", 2) != 2) {
REDEBUG("Failed to send finish to child");
goto ntlm_auth_err;
}
close(to_child);
to_child = -1;
/*
* Read from the child
*/
len = radius_readfrom_program(from_child, pid, 10, buf, sizeof(buf));
if (len < 0) {
/* radius_readfrom_program will have closed from_child for us */
REDEBUG("Failure reading from child");
return -1;
}
close(from_child);
from_child = -1;
buf[len] = 0;
RDEBUG2("ntlm_auth said: %s", buf);
child_pid = rad_waitpid(pid, &status);
if (child_pid == 0) {
REDEBUG("Timeout waiting for child");
return -1;
}
if (child_pid != pid) {
REDEBUG("Abnormal exit status: %s", fr_syserror(errno));
return -1;
}
if (strstr(buf, "Password-Change: Yes")) {
RDEBUG2("ntlm_auth password change succeeded");
return 0;
}
pmsg = strstr(buf, "Password-Change-Error: ");
if (pmsg) {
emsg = strsep(&pmsg, "\n");
} else {
emsg = "could not find error";
}
REDEBUG("ntlm auth password change failed: %s", emsg);
ntlm_auth_err:
/* safe because these either need closing or are == -1 */
close(to_child);
close(from_child);
return -1;
} else if (inst->local_cpw) {
#ifdef HAVE_OPENSSL_CRYPTO_H
/*
* Decrypt the new password blob, add it as a temporary request
* variable, xlat the local_cpw string, then remove it
*
* this allows is to write e..g
*
* %{sql:insert into ...}
*
* ...or...
*
* %{exec:/path/to %{mschap:User-Name} %{MS-CHAP-New-Password}}"
*
*/
VALUE_PAIR *new_pass, *new_hash;
uint8_t *p, *q;
char *x;
size_t i;
size_t passlen;
ssize_t result_len;
char result[253];
uint8_t nt_pass_decrypted[516], old_nt_hash_expected[NT_DIGEST_LENGTH];
RC4_KEY key;
if (!nt_password) {
RDEBUG("Local MS-CHAPv2 password change requires NT-Password attribute");
return -1;
} else {
RDEBUG("Doing MS-CHAPv2 password change locally");
}
/*
* Decrypt the blob
*/
RC4_set_key(&key, nt_password->vp_length, nt_password->vp_octets);
RC4(&key, 516, new_nt_password, nt_pass_decrypted);
/*
* pwblock is
* 512-N bytes random pad
* N bytes password as utf-16-le
* 4 bytes - N as big-endian int
*/
passlen = nt_pass_decrypted[512];
passlen += nt_pass_decrypted[513] << 8;
if ((nt_pass_decrypted[514] != 0) ||
(nt_pass_decrypted[515] != 0)) {
REDEBUG("Decrypted new password blob claims length > 65536, "
"probably an invalid NT-Password");
return -1;
}
/*
* Sanity check - passlen positive and <= 512 if not, crypto has probably gone wrong
*/
if (passlen > 512) {
REDEBUG("Decrypted new password blob claims length %zu > 512, "
"probably an invalid NT-Password", passlen);
return -1;
}
p = nt_pass_decrypted + 512 - passlen;
/*
* The new NT hash - this should be preferred over the
* cleartext password as it avoids unicode hassles.
*/
new_hash = pairmake_packet("MS-CHAP-New-NT-Password", NULL, T_OP_EQ);
new_hash->vp_length = NT_DIGEST_LENGTH;
new_hash->vp_octets = q = talloc_array(new_hash, uint8_t, new_hash->vp_length);
fr_md4_calc(q, p, passlen);
/*
* Check that nt_password encrypted with new_hash
* matches the old_hash value from the client.
*/
smbhash(old_nt_hash_expected, nt_password->vp_octets, q);
smbhash(old_nt_hash_expected+8, nt_password->vp_octets+8, q + 7);
if (memcmp(old_nt_hash_expected, old_nt_hash, NT_DIGEST_LENGTH)!=0) {
REDEBUG("Old NT hash value from client does not match our value");
return -1;