void
mschap_auth_response(u_int8_t *password, int passwordlen,
u_int8_t *ntresponse, u_int8_t *auth_challenge, u_int8_t *peer_challenge,
u_int8_t *username, int usernamelen, u_int8_t *auth_response)
{
EVP_MD_CTX ctx;
u_int8_t password_hash[MSCHAP_HASH_SZ];
u_int8_t password_hash2[MSCHAP_HASH_SZ];
u_int8_t challenge[MSCHAP_CHALLENGE_SZ];
u_int8_t md[SHA_DIGEST_LENGTH], *ptr;
u_int mdlen;
int i;
const u_int8_t hex[] = "0123456789ABCDEF";
static u_int8_t magic1[39] = {
0x4D, 0x61, 0x67, 0x69, 0x63, 0x20, 0x73, 0x65, 0x72, 0x76,
0x65, 0x72, 0x20, 0x74, 0x6F, 0x20, 0x63, 0x6C, 0x69, 0x65,
0x6E, 0x74, 0x20, 0x73, 0x69, 0x67, 0x6E, 0x69, 0x6E, 0x67,
0x20, 0x63, 0x6F, 0x6E, 0x73, 0x74, 0x61, 0x6E, 0x74
};
static u_int8_t magic2[41] = {
0x50, 0x61, 0x64, 0x20, 0x74, 0x6F, 0x20, 0x6D, 0x61, 0x6B,
0x65, 0x20, 0x69, 0x74, 0x20, 0x64, 0x6F, 0x20, 0x6D, 0x6F,
0x72, 0x65, 0x20, 0x74, 0x68, 0x61, 0x6E, 0x20, 0x6F, 0x6E,
0x65, 0x20, 0x69, 0x74, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6F,
0x6E
};
mschap_ntpassword_hash(password, passwordlen, password_hash);
mschap_ntpassword_hash(password_hash, MSCHAP_HASH_SZ, password_hash2);
EVP_DigestInit(&ctx, EVP_sha1());
EVP_DigestUpdate(&ctx, password_hash2, sizeof(password_hash2));
EVP_DigestUpdate(&ctx, ntresponse, 24);
EVP_DigestUpdate(&ctx, magic1, 39);
EVP_DigestFinal(&ctx, md, &mdlen);
mschap_challenge_hash(peer_challenge, auth_challenge,
username, usernamelen, challenge);
EVP_DigestInit(&ctx, EVP_sha1());
EVP_DigestUpdate(&ctx, md, sizeof(md));
EVP_DigestUpdate(&ctx, challenge, sizeof(challenge));
EVP_DigestUpdate(&ctx, magic2, 41);
EVP_DigestFinal(&ctx, md, &mdlen);
/*
* Encode the value of 'Digest' as "S=" followed by
* 40 ASCII hexadecimal digits and return it in
* AuthenticatorResponse.
* For example,
* "S=0123456789ABCDEF0123456789ABCDEF01234567"
*/
ptr = auth_response;
*ptr++ = 'S';
*ptr++ = '=';
for (i = 0; i < SHA_DIGEST_LENGTH; i++) {
*ptr++ = hex[md[i] >> 4];
*ptr++ = hex[md[i] & 0x0f];
}
}
/*
* auth_response() generates MS-CHAP v2 SUCCESS response
* according to RFC 2759 GenerateAuthenticatorResponse()
* returns 42-octet response string
*/
void mschap_auth_response(char const *username,
uint8_t const *nt_hash_hash,
uint8_t const *ntresponse,
uint8_t const *peer_challenge, uint8_t const *auth_challenge,
char *response)
{
fr_SHA1_CTX Context;
static const uint8_t magic1[39] =
{ 0x4D, 0x61, 0x67, 0x69, 0x63, 0x20, 0x73, 0x65, 0x72, 0x76,
0x65, 0x72, 0x20, 0x74, 0x6F, 0x20, 0x63, 0x6C, 0x69, 0x65,
0x6E, 0x74, 0x20, 0x73, 0x69, 0x67, 0x6E, 0x69, 0x6E, 0x67,
0x20, 0x63, 0x6F, 0x6E, 0x73, 0x74, 0x61, 0x6E, 0x74
};
static const uint8_t magic2[41] =
{ 0x50, 0x61, 0x64, 0x20, 0x74, 0x6F, 0x20, 0x6D, 0x61, 0x6B,
0x65, 0x20, 0x69, 0x74, 0x20, 0x64, 0x6F, 0x20, 0x6D, 0x6F,
0x72, 0x65, 0x20, 0x74, 0x68, 0x61, 0x6E, 0x20, 0x6F, 0x6E,
0x65, 0x20, 0x69, 0x74, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6F,
0x6E
};
static char const hex[16] = "0123456789ABCDEF";
size_t i;
uint8_t challenge[8];
uint8_t digest[20];
fr_SHA1Init(&Context);
fr_SHA1Update(&Context, nt_hash_hash, 16);
fr_SHA1Update(&Context, ntresponse, 24);
fr_SHA1Update(&Context, magic1, 39);
fr_SHA1Final(digest, &Context);
mschap_challenge_hash(peer_challenge, auth_challenge, username, challenge);
fr_SHA1Init(&Context);
fr_SHA1Update(&Context, digest, 20);
fr_SHA1Update(&Context, challenge, 8);
fr_SHA1Update(&Context, magic2, 41);
fr_SHA1Final(digest, &Context);
/*
* Encode the value of 'Digest' as "S=" followed by
* 40 ASCII hexadecimal digits and return it in
* AuthenticatorResponse.
* For example,
* "S=0123456789ABCDEF0123456789ABCDEF01234567"
*/
response[0] = 'S';
response[1] = '=';
/*
* The hexadecimal digits [A-F] MUST be uppercase.
*/
for (i = 0; i < sizeof(digest); i++) {
response[2 + (i * 2)] = hex[(digest[i] >> 4) & 0x0f];
response[3 + (i * 2)] = hex[digest[i] & 0x0f];
}
}
void
mschap_nt_response(u_int8_t *auth_challenge, u_int8_t *peer_challenge,
u_int8_t *username, int usernamelen, u_int8_t *password, int passwordlen,
u_int8_t *response)
{
u_int8_t challenge[MSCHAP_CHALLENGE_SZ];
u_int8_t password_hash[MSCHAP_HASH_SZ];
mschap_challenge_hash(peer_challenge, auth_challenge,
username, usernamelen, challenge);
mschap_ntpassword_hash(password, passwordlen, password_hash);
mschap_challenge_response(challenge, password_hash, response);
}
/*
* mschap_authenticate() - authenticate user based on given
* attributes and configuration.
* We will try to find out password in configuration
* or in configured passwd file.
* If one is found we will check paraneters given by NAS.
*
* If PW_SMB_ACCOUNT_CTRL is not set to ACB_PWNOTREQ we must have
* one of:
* PAP: PW_USER_PASSWORD or
* MS-CHAP: PW_MSCHAP_CHALLENGE and PW_MSCHAP_RESPONSE or
* MS-CHAP2: PW_MSCHAP_CHALLENGE and PW_MSCHAP2_RESPONSE
* In case of password mismatch or locked account we MAY return
* PW_MSCHAP_ERROR for MS-CHAP or MS-CHAP v2
* If MS-CHAP2 succeeds we MUST return
* PW_MSCHAP2_SUCCESS
*/
static int mschap_authenticate(void * instance, REQUEST *request)
{
#define inst ((rlm_mschap_t *)instance)
VALUE_PAIR *challenge = NULL;
VALUE_PAIR *response = NULL;
VALUE_PAIR *password = NULL;
VALUE_PAIR *lm_password, *nt_password, *smb_ctrl;
VALUE_PAIR *username;
uint8_t nthashhash[16];
char msch2resp[42];
char *username_string;
int chap = 0;
int do_ntlm_auth;
/*
* If we have ntlm_auth configured, use it unless told
* otherwise
*/
do_ntlm_auth = (inst->ntlm_auth != NULL);
/*
* If we have an ntlm_auth configuration, then we may
* want to suppress it.
*/
if (do_ntlm_auth) {
VALUE_PAIR *vp = pairfind(request->config_items,
PW_MS_CHAP_USE_NTLM_AUTH);
if (vp) do_ntlm_auth = vp->vp_integer;
}
/*
* Find the SMB-Account-Ctrl attribute, or the
* SMB-Account-Ctrl-Text attribute.
*/
smb_ctrl = pairfind(request->config_items, PW_SMB_ACCOUNT_CTRL);
if (!smb_ctrl) {
password = pairfind(request->config_items,
PW_SMB_ACCOUNT_CTRL_TEXT);
if (password) {
smb_ctrl = radius_pairmake(request,
&request->config_items,
"SMB-Account-CTRL", "0",
T_OP_SET);
if (smb_ctrl) {
smb_ctrl->vp_integer = pdb_decode_acct_ctrl(password->vp_strvalue);
}
}
}
/*
* We're configured to do MS-CHAP authentication.
* and account control information exists. Enforce it.
*/
if (smb_ctrl) {
/*
* Password is not required.
*/
if ((smb_ctrl->vp_integer & ACB_PWNOTREQ) != 0) {
RDEBUG2("SMB-Account-Ctrl says no password is required.");
return RLM_MODULE_OK;
}
}
/*
* Decide how to get the passwords.
*/
password = pairfind(request->config_items, PW_CLEARTEXT_PASSWORD);
/*
* We need an LM-Password.
*/
lm_password = pairfind(request->config_items, PW_LM_PASSWORD);
if (lm_password) {
/*
* Allow raw octets.
*/
if ((lm_password->length == 16) ||
((lm_password->length == 32) &&
(fr_hex2bin(lm_password->vp_strvalue,
lm_password->vp_octets, 16) == 16))) {
RDEBUG2("Found LM-Password");
lm_password->length = 16;
} else {
radlog_request(L_ERR, 0, request, "Invalid LM-Password");
lm_password = NULL;
}
} else if (!password) {
if (!do_ntlm_auth) RDEBUG2("No Cleartext-Password configured. Cannot create LM-Password.");
} else { /* there is a configured Cleartext-Password */
lm_password = radius_pairmake(request, &request->config_items,
"LM-Password", "", T_OP_EQ);
if (!lm_password) {
radlog_request(L_ERR, 0, request, "No memory");
} else {
smbdes_lmpwdhash(password->vp_strvalue,
lm_password->vp_octets);
lm_password->length = 16;
}
}
/*
* We need an NT-Password.
*/
nt_password = pairfind(request->config_items, PW_NT_PASSWORD);
if (nt_password) {
if ((nt_password->length == 16) ||
((nt_password->length == 32) &&
(fr_hex2bin(nt_password->vp_strvalue,
nt_password->vp_octets, 16) == 16))) {
RDEBUG2("Found NT-Password");
nt_password->length = 16;
} else {
radlog_request(L_ERR, 0, request, "Invalid NT-Password");
nt_password = NULL;
}
} else if (!password) {
if (!do_ntlm_auth) RDEBUG2("No Cleartext-Password configured. Cannot create NT-Password.");
} else { /* there is a configured Cleartext-Password */
nt_password = radius_pairmake(request, &request->config_items,
"NT-Password", "", T_OP_EQ);
if (!nt_password) {
radlog_request(L_ERR, 0, request, "No memory");
return RLM_MODULE_FAIL;
} else {
mschap_ntpwdhash(nt_password->vp_octets,
password->vp_strvalue);
nt_password->length = 16;
}
}
challenge = pairfind(request->packet->vps, PW_MSCHAP_CHALLENGE);
if (!challenge) {
RDEBUG("ERROR: You set 'Auth-Type = MS-CHAP' for a request that does not contain any MS-CHAP attributes!");
return RLM_MODULE_REJECT;
}
/*
* We also require an MS-CHAP-Response.
*/
response = pairfind(request->packet->vps, PW_MSCHAP_RESPONSE);
/*
* MS-CHAP-Response, means MS-CHAPv1
*/
if (response) {
int offset;
/*
* MS-CHAPv1 challenges are 8 octets.
*/
if (challenge->length < 8) {
radlog_request(L_AUTH, 0, request, "MS-CHAP-Challenge has the wrong format.");
return RLM_MODULE_INVALID;
}
/*
* Responses are 50 octets.
*/
if (response->length < 50) {
radlog_request(L_AUTH, 0, request, "MS-CHAP-Response has the wrong format.");
return RLM_MODULE_INVALID;
}
/*
* We are doing MS-CHAP. Calculate the MS-CHAP
* response
*/
if (response->vp_octets[1] & 0x01) {
RDEBUG2("Client is using MS-CHAPv1 with NT-Password");
password = nt_password;
offset = 26;
} else {
RDEBUG2("Client is using MS-CHAPv1 with LM-Password");
password = lm_password;
offset = 2;
}
/*
* Do the MS-CHAP authentication.
*/
if (do_mschap(inst, request, password, challenge->vp_octets,
response->vp_octets + offset, nthashhash,
do_ntlm_auth) < 0) {
RDEBUG2("MS-CHAP-Response is incorrect.");
goto do_error;
}
chap = 1;
} else if ((response = pairfind(request->packet->vps, PW_MSCHAP2_RESPONSE)) != NULL) {
uint8_t mschapv1_challenge[16];
VALUE_PAIR *name_attr, *response_name;
/*
* MS-CHAPv2 challenges are 16 octets.
*/
if (challenge->length < 16) {
radlog_request(L_AUTH, 0, request, "MS-CHAP-Challenge has the wrong format.");
return RLM_MODULE_INVALID;
}
/*
* Responses are 50 octets.
*/
if (response->length < 50) {
radlog_request(L_AUTH, 0, request, "MS-CHAP-Response has the wrong format.");
return RLM_MODULE_INVALID;
}
/*
* We also require a User-Name
*/
username = pairfind(request->packet->vps, PW_USER_NAME);
if (!username) {
radlog_request(L_AUTH, 0, request, "We require a User-Name for MS-CHAPv2");
return RLM_MODULE_INVALID;
}
/*
* 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);
if (response_name) {
name_attr = response_name;
} else {
name_attr = username;
}
/*
* with_ntdomain_hack moved here, too.
*/
if ((username_string = strchr(name_attr->vp_strvalue, '\\')) != NULL) {
if (inst->with_ntdomain_hack) {
username_string++;
} else {
RDEBUG2("NT Domain delimeter found, should we have enabled with_ntdomain_hack?");
username_string = name_attr->vp_strvalue;
}
} else {
username_string = name_attr->vp_strvalue;
}
if (response_name &&
((username->length != response_name->length) ||
(strncasecmp(username->vp_strvalue, response_name->vp_strvalue, username->length) != 0))) {
RDEBUG("ERROR: User-Name (%s) is not the same as MS-CHAP Name (%s) from EAP-MSCHAPv2", username->vp_strvalue, response_name->vp_strvalue);
return RLM_MODULE_REJECT;
}
/*
* The old "mschapv2" function has been moved to
* here.
*
* MS-CHAPv2 takes some additional data to create an
* MS-CHAPv1 challenge, and then does MS-CHAPv1.
*/
RDEBUG2("Creating challenge hash with username: %s",
username_string);
mschap_challenge_hash(response->vp_octets + 2, /* peer challenge */
challenge->vp_octets, /* our challenge */
username_string, /* user name */
mschapv1_challenge); /* resulting challenge */
RDEBUG2("Client is using MS-CHAPv2 for %s, we need NT-Password",
username_string);
#ifdef __APPLE__
if (inst->open_directory) {
return do_od_mschap(request, response, challenge, username_string);
}
#endif
if (do_mschap(inst, request, nt_password, mschapv1_challenge,
response->vp_octets + 26, nthashhash,
do_ntlm_auth) < 0) {
int i;
char buffer[128];
RDEBUG2("FAILED: MS-CHAP2-Response is incorrect");
do_error:
snprintf(buffer, sizeof(buffer), "E=691 R=%d",
inst->allow_retry);
if (inst->retry_msg) {
snprintf(buffer + 9, sizeof(buffer) - 9, " C=");
for (i = 0; i < 16; i++) {
snprintf(buffer + 12 + i*2,
sizeof(buffer) - 12 - i*2, "%02x",
fr_rand() & 0xff);
}
snprintf(buffer + 44, sizeof(buffer) - 44,
" V=3 M=%s", inst->retry_msg);
}
mschap_add_reply(request, &request->reply->vps,
*response->vp_octets, "MS-CHAP-Error",
buffer, strlen(buffer));
return RLM_MODULE_REJECT;
}
mschap_auth_response(username_string, /* without the domain */
nthashhash, /* nt-hash-hash */
response->vp_octets + 26, /* peer response */
response->vp_octets + 2, /* peer challenge */
challenge->vp_octets, /* our challenge */
msch2resp); /* calculated MPPE key */
mschap_add_reply(request, &request->reply->vps, *response->vp_octets,
"MS-CHAP2-Success", msch2resp, 42);
chap = 2;
} else { /* Neither CHAPv1 or CHAPv2 response: die */
RDEBUG("ERROR: You set 'Auth-Type = MS-CHAP' for a request that does not contain any MS-CHAP attributes!");
return RLM_MODULE_INVALID;
}
/*
* We have a CHAP response, but the account may be
* disabled. Reject the user with the same error code
* we use when their password is invalid.
*/
if (smb_ctrl) {
/*
* Account is disabled.
*
* They're found, but they don't exist, so we
* return 'not found'.
*/
if (((smb_ctrl->vp_integer & ACB_DISABLED) != 0) ||
((smb_ctrl->vp_integer & (ACB_NORMAL|ACB_WSTRUST)) == 0)) {
RDEBUG2("SMB-Account-Ctrl says that the account is disabled, or is not a normal or workstatin trust account.");
mschap_add_reply(request, &request->reply->vps,
*response->vp_octets,
"MS-CHAP-Error", "E=691 R=1", 9);
return RLM_MODULE_NOTFOUND;
}
/*
* User is locked out.
*/
if ((smb_ctrl->vp_integer & ACB_AUTOLOCK) != 0) {
RDEBUG2("SMB-Account-Ctrl says that the account is locked out.");
mschap_add_reply(request, &request->reply->vps,
*response->vp_octets,
"MS-CHAP-Error", "E=647 R=0", 9);
return RLM_MODULE_USERLOCK;
}
}
/* now create MPPE attributes */
if (inst->use_mppe) {
uint8_t mppe_sendkey[34];
uint8_t mppe_recvkey[34];
if (chap == 1){
RDEBUG2("adding MS-CHAPv1 MPPE keys");
memset(mppe_sendkey, 0, 32);
if (lm_password) {
memcpy(mppe_sendkey, lm_password->vp_octets, 8);
}
/*
* According to RFC 2548 we
* should send NT hash. But in
* practice it doesn't work.
* Instead, we should send nthashhash
*
* This is an error on RFC 2548.
*/
/*
* do_mschap cares to zero nthashhash if NT hash
* is not available.
*/
memcpy(mppe_sendkey + 8,
nthashhash, 16);
mppe_add_reply(request,
"MS-CHAP-MPPE-Keys",
mppe_sendkey, 32);
} else if (chap == 2) {
RDEBUG2("adding MS-CHAPv2 MPPE keys");
mppe_chap2_gen_keys128(nthashhash,
response->vp_octets + 26,
mppe_sendkey, mppe_recvkey);
mppe_add_reply(request,
"MS-MPPE-Recv-Key",
mppe_recvkey, 16);
mppe_add_reply(request,
"MS-MPPE-Send-Key",
mppe_sendkey, 16);
}
radius_pairmake(request, &request->reply->vps,
"MS-MPPE-Encryption-Policy",
(inst->require_encryption)? "0x00000002":"0x00000001",
T_OP_EQ);
radius_pairmake(request, &request->reply->vps,
"MS-MPPE-Encryption-Types",
(inst->require_strong)? "0x00000004":"0x00000006",
T_OP_EQ);
} /* else we weren't asked to use MPPE */
return RLM_MODULE_OK;
#undef inst
}
/*
* Does dynamic translation of strings.
*
* Pulls NT-Response, LM-Response, or Challenge from MSCHAP
* attributes.
*/
static size_t mschap_xlat(void *instance, REQUEST *request,
char *fmt, char *out, size_t outlen,
RADIUS_ESCAPE_STRING func)
{
size_t i, data_len;
uint8_t *data = NULL;
uint8_t buffer[32];
VALUE_PAIR *user_name;
VALUE_PAIR *chap_challenge, *response;
rlm_mschap_t *inst = instance;
response = NULL;
func = func; /* -Wunused */
/*
* 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);
if (!chap_challenge) {
RDEBUG2("No MS-CHAP-Challenge in the request.");
return 0;
}
/*
* MS-CHAP-Challenges are 8 octets,
* for MS-CHAPv2
*/
if (chap_challenge->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->length == 16) {
VALUE_PAIR *name_attr, *response_name;
char *username_string;
response = pairfind(request->packet->vps,
PW_MSCHAP2_RESPONSE);
if (!response) {
RDEBUG2("MS-CHAP2-Response is required to calculate MS-CHAPv1 challenge.");
return 0;
}
/*
* FIXME: Much of this is copied from
* below. We should put it into a
* separate function.
*/
/*
* Responses are 50 octets.
*/
if (response->length < 50) {
radlog_request(L_AUTH, 0, request, "MS-CHAP-Response has the wrong format.");
return 0;
}
user_name = pairfind(request->packet->vps,
PW_USER_NAME);
if (!user_name) {
RDEBUG2("User-Name is required to calculate MS-CHAPv1 Challenge.");
return 0;
}
/*
* 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);
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 {
RDEBUG2("NT Domain delimeter 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->length != response_name->length) ||
(strncasecmp(user_name->vp_strvalue, response_name->vp_strvalue, user_name->length) != 0))) {
RDEBUG("WARNING: 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 {
RDEBUG2("Invalid MS-CHAP challenge length");
return 0;
}
/*
* 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);
if (!response) response = pairfind(request->packet->vps,
PW_MSCHAP2_RESPONSE);
if (!response) {
RDEBUG2("No MS-CHAP-Response or MS-CHAP2-Response was found in the request.");
return 0;
}
/*
* For MS-CHAPv1, the NT-Response exists only
* if the second octet says so.
*/
if ((response->attribute == PW_MSCHAP_RESPONSE) &&
((response->vp_octets[1] & 0x01) == 0)) {
RDEBUG2("No NT-Response in MS-CHAP-Response");
return 0;
}
/*
* 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);
if (!response) {
RDEBUG2("No MS-CHAP-Response was found in the request.");
return 0;
}
/*
* For MS-CHAPv1, the NT-Response exists only
* if the second octet says so.
*/
if ((response->vp_octets[1] & 0x01) != 0) {
RDEBUG2("No LM-Response in MS-CHAP-Response");
return 0;
}
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);
if (!user_name) {
RDEBUG2("No User-Name was found in the request.");
return 0;
}
/*
* 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) {
RDEBUG2("No NT-Domain was found in the User-Name.");
return 0;
}
/*
* 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 *p;
user_name = pairfind(request->packet->vps, PW_USER_NAME);
if (!user_name) {
RDEBUG2("No User-Name was found in the request.");
return 0;
}
/*
* 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. 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.
*/
p = strchr(user_name->vp_strvalue, '.');
/*
* use the same hack as above
* only if a period was found
*/
if (p) *p = '\0';
snprintf(out, outlen, "%s$", user_name->vp_strvalue + 5);
if (p) *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 *p;
char buf2[1024];
p = fmt + 8; /* 7 is the length of 'NT-Hash' */
if ((p == '\0') || (outlen <= 32))
return 0;
while (isspace(*p)) p++;
if (!radius_xlat(buf2, sizeof(buf2),p,request,NULL)) {
RDEBUG("xlat failed");
*buffer = '\0';
return 0;
}
mschap_ntpwdhash(buffer,buf2);
fr_bin2hex(buffer, out, 16);
out[32] = '\0';
RDEBUG("NT-Hash of %s = %s", buf2, out);
return 32;
/*
* Return the LM-Hash of the passed string
*/
} else if (strncasecmp(fmt, "LM-Hash ", 8) == 0) {
char *p;
char buf2[1024];
p = fmt + 8; /* 7 is the length of 'LM-Hash' */
if ((p == '\0') || (outlen <= 32))
return 0;
while (isspace(*p)) p++;
if (!radius_xlat(buf2, sizeof(buf2),p,request,NULL)) {
RDEBUG("xlat failed");
*buffer = '\0';
return 0;
}
smbdes_lmpwdhash(buf2, buffer);
fr_bin2hex(buffer, out, 16);
out[32] = '\0';
RDEBUG("LM-Hash of %s = %s", buf2, out);
return 32;
} else {
RDEBUG2("Unknown expansion string \"%s\"",
fmt);
return 0;
}
if (outlen == 0) return 0; /* nowhere to go, don't do anything */
/*
* Didn't set anything: this is bad.
*/
if (!data) {
RDEBUG2("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;
}
