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be40e72015e700e87cd4fd9dedba6e1a3f5a7481
heimdal/kdc/digest.c
Love Hörnquist Åstrand be40e72015 Support NTLM verification, note that the KDC does no NTLM packet 
parsing, its all done by the client side, the KDC just calculate and
verify the digest and return the result to the service.


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@19378 ec53bebd-3082-4978-b11e-865c3cabbd6b
2006-12-15 21:33:26 +00:00

920 lines
24 KiB
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/*
* Copyright (c) 2006 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kdc_locl.h"
#include <digest_asn1.h>
#include <hex.h>
RCSID("$Id$");
static krb5_error_code
get_digest_key(krb5_context context,
krb5_kdc_configuration *config,
hdb_entry_ex *server,
krb5_crypto *crypto)
{
krb5_error_code ret;
krb5_enctype enctype;
Key *key;
ret = _kdc_get_preferred_key(context,
config,
server,
"digest-service",
&enctype,
&key);
if (ret)
return ret;
return krb5_crypto_init(context, &key->key, 0, crypto);
}
/*
*
*/
krb5_error_code
_kdc_do_digest(krb5_context context,
krb5_kdc_configuration *config,
const DigestREQ *req, krb5_data *reply,
const char *from, struct sockaddr *addr)
{
krb5_error_code ret = 0;
krb5_ticket *ticket = NULL;
krb5_auth_context ac = NULL;
krb5_keytab id = NULL;
krb5_crypto crypto = NULL;
DigestReqInner ireq;
DigestRepInner r;
DigestREP rep;
krb5_flags ap_req_options;
krb5_data buf;
size_t size;
krb5_storage *sp = NULL;
Checksum res;
hdb_entry_ex *server = NULL, *user = NULL;
hdb_entry_ex *client = NULL;
char *client_name = NULL, *password = NULL;
krb5_data serverNonce;
if(!config->enable_digest) {
kdc_log(context, config, 0, "Rejected digest request from %s", from);
return KRB5KDC_ERR_POLICY;
}
krb5_data_zero(&buf);
krb5_data_zero(reply);
krb5_data_zero(&serverNonce);
memset(&ireq, 0, sizeof(ireq));
memset(&r, 0, sizeof(r));
memset(&rep, 0, sizeof(rep));
kdc_log(context, config, 0, "Digest request from %s", from);
ret = krb5_kt_resolve(context, "HDB:", &id);
if (ret) {
kdc_log(context, config, 0, "Can't open database for digest");
goto out;
}
ret = krb5_rd_req(context,
&ac,
&req->apReq,
NULL,
id,
&ap_req_options,
&ticket);
if (ret)
goto out;
/* check the server principal in the ticket matches digest/R@R */
{
krb5_principal principal = NULL;
const char *p, *r;
ret = krb5_ticket_get_server(context, ticket, &principal);
if (ret)
goto out;
ret = EINVAL;
krb5_set_error_string(context, "Wrong digest server principal used");
p = krb5_principal_get_comp_string(context, principal, 0);
if (p == NULL) {
krb5_free_principal(context, principal);
goto out;
}
if (strcmp(p, KRB5_DIGEST_NAME) != 0) {
krb5_free_principal(context, principal);
goto out;
}
p = krb5_principal_get_comp_string(context, principal, 1);
if (p == NULL) {
krb5_free_principal(context, principal);
goto out;
}
r = krb5_principal_get_realm(context, principal);
if (r == NULL) {
krb5_free_principal(context, principal);
goto out;
}
if (strcmp(p, r) != 0) {
krb5_free_principal(context, principal);
goto out;
}
krb5_clear_error_string(context);
ret = _kdc_db_fetch(context, config, principal,
HDB_F_GET_SERVER, NULL, &server);
if (ret)
goto out;
krb5_free_principal(context, principal);
}
/* check the client is allowed to do digest auth */
{
krb5_principal principal = NULL;
ret = krb5_ticket_get_client(context, ticket, &principal);
if (ret)
goto out;
ret = krb5_unparse_name(context, principal, &client_name);
if (ret) {
krb5_free_principal(context, principal);
goto out;
}
ret = _kdc_db_fetch(context, config, principal,
HDB_F_GET_CLIENT, NULL, &client);
krb5_free_principal(context, principal);
if (ret)
goto out;
if (client->entry.flags.allow_digest == 0) {
kdc_log(context, config, 0,
"Client %s tried to use digest "
"but is not allowed to",
client_name);
krb5_set_error_string(context,
"Client is not permitted to use digest");
ret = KRB5KDC_ERR_POLICY;
goto out;
}
}
/* unpack request */
{
krb5_keyblock *key;
ret = krb5_auth_con_getremotesubkey(context, ac, &key);
if (ret)
goto out;
if (key == NULL) {
krb5_set_error_string(context, "digest: remote subkey not found");
ret = EINVAL;
goto out;
}
ret = krb5_crypto_init(context, key, 0, &crypto);
krb5_free_keyblock (context, key);
if (ret)
goto out;
}
ret = krb5_decrypt_EncryptedData(context, crypto, KRB5_KU_DIGEST_ENCRYPT,
&req->innerReq, &buf);
krb5_crypto_destroy(context, crypto);
crypto = NULL;
if (ret)
goto out;
ret = decode_DigestReqInner(buf.data, buf.length, &ireq, NULL);
krb5_data_free(&buf);
if (ret) {
krb5_set_error_string(context, "Failed to decode digest inner request");
goto out;
}
kdc_log(context, config, 0, "Valid digest request from %s", client_name);
/*
* Process the inner request
*/
switch (ireq.element) {
case choice_DigestReqInner_init: {
unsigned char server_nonce[16], identifier;
RAND_pseudo_bytes(&identifier, sizeof(identifier));
RAND_pseudo_bytes(server_nonce, sizeof(server_nonce));
server_nonce[0] = kdc_time & 0xff;
server_nonce[1] = (kdc_time >> 8) & 0xff;
server_nonce[2] = (kdc_time >> 16) & 0xff;
server_nonce[3] = (kdc_time >> 24) & 0xff;
r.element = choice_DigestRepInner_initReply;
hex_encode(server_nonce, sizeof(server_nonce), &r.u.initReply.nonce);
if (r.u.initReply.nonce == NULL) {
krb5_set_error_string(context, "Failed to decode server nonce");
ret = ENOMEM;
goto out;
}
sp = krb5_storage_emem();
if (sp == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "out of memory");
goto out;
}
ret = krb5_store_stringz(sp, ireq.u.init.type);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
if (ireq.u.init.channel) {
char *s;
asprintf(&s, "%s-%s:%s", r.u.initReply.nonce,
ireq.u.init.channel->cb_type,
ireq.u.init.channel->cb_binding);
if (s == NULL) {
krb5_set_error_string(context, "Failed to allocate "
"channel binding");
ret = ENOMEM;
goto out;
}
free(r.u.initReply.nonce);
r.u.initReply.nonce = s;
}
ret = krb5_store_stringz(sp, r.u.initReply.nonce);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
if (strcasecmp(ireq.u.init.type, "CHAP") == 0) {
r.u.initReply.identifier =
malloc(sizeof(*r.u.initReply.identifier));
if (r.u.initReply.identifier == NULL) {
krb5_set_error_string(context, "out of memory");
ret = ENOMEM;
goto out;
}
asprintf(r.u.initReply.identifier, "%02X", identifier & 0xff);
if (*r.u.initReply.identifier == NULL) {
krb5_set_error_string(context, "out of memory");
ret = ENOMEM;
goto out;
}
ret = krb5_store_stringz(sp, *r.u.initReply.identifier);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
} else
r.u.initReply.identifier = NULL;
if (ireq.u.init.hostname) {
ret = krb5_store_stringz(sp, *ireq.u.init.hostname);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
}
ret = krb5_storage_to_data(sp, &buf);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
ret = get_digest_key(context, config, server, &crypto);
if (ret)
goto out;
ret = krb5_create_checksum(context,
crypto,
KRB5_KU_DIGEST_OPAQUE,
0,
buf.data,
buf.length,
&res);
krb5_crypto_destroy(context, crypto);
crypto = NULL;
krb5_data_free(&buf);
if (ret)
goto out;
ASN1_MALLOC_ENCODE(Checksum, buf.data, buf.length, &res, &size, ret);
free_Checksum(&res);
if (ret) {
krb5_set_error_string(context, "Failed to encode "
"checksum in digest request");
goto out;
}
if (size != buf.length)
krb5_abortx(context, "ASN1 internal error");
hex_encode(buf.data, buf.length, &r.u.initReply.opaque);
free(buf.data);
if (r.u.initReply.opaque == NULL) {
krb5_clear_error_string(context);
ret = ENOMEM;
goto out;
}
break;
}
case choice_DigestReqInner_digestRequest: {
krb5_principal clientprincipal;
HDB *db;
sp = krb5_storage_emem();
if (sp == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "out of memory");
goto out;
}
krb5_store_stringz(sp, ireq.u.digestRequest.type);
krb5_store_stringz(sp, ireq.u.digestRequest.serverNonce);
if (ireq.u.digestRequest.identifier) {
ret = krb5_store_stringz(sp, *ireq.u.digestRequest.identifier);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
}
if (ireq.u.digestRequest.hostname) {
ret = krb5_store_stringz(sp, *ireq.u.digestRequest.hostname);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
}
buf.length = strlen(ireq.u.digestRequest.opaque);
buf.data = malloc(buf.length);
if (buf.data == NULL) {
krb5_set_error_string(context, "out of memory");
ret = ENOMEM;
goto out;
}
ret = hex_decode(ireq.u.digestRequest.opaque, buf.data, buf.length);
if (ret <= 0) {
krb5_set_error_string(context, "Failed to decode opaque");
ret = ENOMEM;
goto out;
}
buf.length = ret;
ret = decode_Checksum(buf.data, buf.length, &res, NULL);
free(buf.data);
if (ret) {
krb5_set_error_string(context, "Failed to decode digest Checksum");
goto out;
}
ret = krb5_storage_to_data(sp, &buf);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
serverNonce.length = strlen(ireq.u.digestRequest.serverNonce);
serverNonce.data = malloc(serverNonce.length);
if (serverNonce.data == NULL) {
krb5_set_error_string(context, "out of memory");
ret = ENOMEM;
goto out;
}
/*
* CHAP does the checksum of the raw nonce, but do it for all
* types, since we need to check the timestamp.
*/
{
ssize_t ssize;
ssize = hex_decode(ireq.u.digestRequest.serverNonce,
serverNonce.data, serverNonce.length);
if (ssize <= 0) {
krb5_set_error_string(context, "Failed to decode serverNonce");
ret = ENOMEM;
goto out;
}
serverNonce.length = ssize;
}
ret = get_digest_key(context, config, server, &crypto);
if (ret)
goto out;
ret = krb5_verify_checksum(context, crypto,
KRB5_KU_DIGEST_OPAQUE,
buf.data, buf.length, &res);
krb5_crypto_destroy(context, crypto);
crypto = NULL;
if (ret)
goto out;
/* verify time */
{
unsigned char *p = serverNonce.data;
uint32_t t;
if (serverNonce.length < 4) {
krb5_set_error_string(context, "server nonce too short");
ret = EINVAL;
goto out;
}
t = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
if (abs((kdc_time & 0xffffffff) - t) > context->max_skew) {
krb5_set_error_string(context, "time screw in server nonce ");
ret = EINVAL;
goto out;
}
}
/* get username */
ret = krb5_parse_name(context,
ireq.u.digestRequest.username,
&clientprincipal);
if (ret)
goto out;
ret = _kdc_db_fetch(context, config, clientprincipal,
HDB_F_GET_CLIENT, &db, &user);
krb5_free_principal(context, clientprincipal);
if (ret)
goto out;
ret = hdb_entry_get_password(context, db, &user->entry, &password);
if (ret || password == NULL) {
if (ret == 0) {
ret = EINVAL;
krb5_set_error_string(context, "password missing");
}
goto out;
}
if (strcasecmp(ireq.u.digestRequest.type, "CHAP") == 0) {
MD5_CTX ctx;
unsigned char md[MD5_DIGEST_LENGTH];
char id;
if (ireq.u.digestRequest.identifier == NULL) {
krb5_set_error_string(context, "Identifier missing "
"from CHAP request");
ret = EINVAL;
goto out;
}
if (hex_decode(*ireq.u.digestRequest.identifier, &id, 1) != 1) {
krb5_set_error_string(context, "failed to decode identifier");
ret = EINVAL;
goto out;
}
MD5_Init(&ctx);
MD5_Update(&ctx, &id, 1);
MD5_Update(&ctx, password, strlen(password));
MD5_Update(&ctx, serverNonce.data, serverNonce.length);
MD5_Final(md, &ctx);
r.element = choice_DigestRepInner_response;
hex_encode(md, sizeof(md), &r.u.response.responseData);
if (r.u.response.responseData == NULL) {
krb5_clear_error_string(context);
ret = ENOMEM;
goto out;
}
} else if (strcasecmp(ireq.u.digestRequest.type, "SASL-DIGEST-MD5") == 0) {
MD5_CTX ctx;
unsigned char md[MD5_DIGEST_LENGTH];
char *A1, *A2;
if (ireq.u.digestRequest.nonceCount == NULL)
goto out;
if (ireq.u.digestRequest.clientNonce == NULL)
goto out;
if (ireq.u.digestRequest.qop == NULL)
goto out;
if (ireq.u.digestRequest.realm == NULL)
goto out;
MD5_Init(&ctx);
MD5_Update(&ctx, ireq.u.digestRequest.username,
strlen(ireq.u.digestRequest.username));
MD5_Update(&ctx, ":", 1);
MD5_Update(&ctx, *ireq.u.digestRequest.realm,
strlen(*ireq.u.digestRequest.realm));
MD5_Update(&ctx, ":", 1);
MD5_Update(&ctx, password, strlen(password));
MD5_Final(md, &ctx);
MD5_Init(&ctx);
MD5_Update(&ctx, md, sizeof(md));
MD5_Update(&ctx, ":", 1);
MD5_Update(&ctx, ireq.u.digestRequest.serverNonce,
strlen(ireq.u.digestRequest.serverNonce));
MD5_Update(&ctx, ":", 1);
MD5_Update(&ctx, *ireq.u.digestRequest.nonceCount,
strlen(*ireq.u.digestRequest.nonceCount));
if (ireq.u.digestRequest.authid) {
MD5_Update(&ctx, ":", 1);
MD5_Update(&ctx, *ireq.u.digestRequest.authid,
strlen(*ireq.u.digestRequest.authid));
}
MD5_Final(md, &ctx);
hex_encode(md, sizeof(md), &A1);
if (A1 == NULL) {
krb5_set_error_string(context, "out of memory");
ret = ENOMEM;
goto out;
}
MD5_Init(&ctx);
MD5_Update(&ctx, "AUTHENTICATE:", sizeof("AUTHENTICATE:") - 1);
MD5_Update(&ctx, *ireq.u.digestRequest.uri,
strlen(*ireq.u.digestRequest.uri));
/* conf|int */
if (strcmp(ireq.u.digestRequest.digest, "clear") != 0) {
static char conf_zeros[] = ":00000000000000000000000000000000";
MD5_Update(&ctx, conf_zeros, sizeof(conf_zeros) - 1);
}
MD5_Final(md, &ctx);
hex_encode(md, sizeof(md), &A2);
if (A2 == NULL) {
krb5_set_error_string(context, "out of memory");
ret = ENOMEM;
free(A1);
goto out;
}
MD5_Init(&ctx);
MD5_Update(&ctx, A1, strlen(A2));
MD5_Update(&ctx, ":", 1);
MD5_Update(&ctx, ireq.u.digestRequest.serverNonce,
strlen(ireq.u.digestRequest.serverNonce));
MD5_Update(&ctx, ":", 1);
MD5_Update(&ctx, *ireq.u.digestRequest.nonceCount,
strlen(*ireq.u.digestRequest.nonceCount));
MD5_Update(&ctx, ":", 1);
MD5_Update(&ctx, *ireq.u.digestRequest.clientNonce,
strlen(*ireq.u.digestRequest.clientNonce));
MD5_Update(&ctx, ":", 1);
MD5_Update(&ctx, *ireq.u.digestRequest.qop,
strlen(*ireq.u.digestRequest.qop));
MD5_Update(&ctx, ":", 1);
MD5_Update(&ctx, A2, strlen(A2));
MD5_Final(md, &ctx);
r.element = choice_DigestRepInner_response;
hex_encode(md, sizeof(md), &r.u.response.responseData);
free(A1);
free(A2);
if (r.u.response.responseData == NULL) {
krb5_set_error_string(context, "out of memory");
ret = ENOMEM;
goto out;
}
} else {
r.element = choice_DigestRepInner_error;
asprintf(&r.u.error.reason, "unsupported digest type %s",
ireq.u.digestRequest.type);
if (r.u.error.reason == NULL) {
krb5_set_error_string(context, "out of memory");
ret = ENOMEM;
goto out;
}
r.u.error.code = EINVAL;
}
break;
}
case choice_DigestReqInner_ntlmInit: {
char *targetname = NULL;
r.element = choice_DigestRepInner_ntlmInitReply;
r.u.ntlmInitReply.flags = NTLM_NEG_UNICODE;
if ((ireq.u.ntlmInit.flags & NTLM_NEG_UNICODE) == 0) {
kdc_log(context, config, 0, "NTLM client have no unicode");
goto out;
}
if (ireq.u.ntlmInit.flags & NTLM_NEG_NTLM)
r.u.ntlmInitReply.flags |= NTLM_NEG_NTLM;
else {
kdc_log(context, config, 0, "NTLM client doesn't support NTLM");
goto out;
}
r.u.ntlmInitReply.flags |=
(ireq.u.ntlmInit.flags & (NTLM_NEG_SIGN|NTLM_NEG_SEAL)) |
NTLM_NEG_TARGET_DOMAIN |
NTLM_ENC_128;
targetname = strdup(krb5_principal_get_realm(context,
client->entry.principal));
{
char *p = strchr(targetname, '.');
if (p)
*p = '\0';
}
strupr(targetname);
r.u.ntlmInitReply.targetname = targetname;
r.u.ntlmInitReply.challange.data = malloc(8);
if (r.u.ntlmInitReply.challange.data == NULL) {
krb5_set_error_string(context, "out of memory");
ret = ENOMEM;
goto out;
}
r.u.ntlmInitReply.challange.length = 8;
if (RAND_bytes(r.u.ntlmInitReply.challange.data,
r.u.ntlmInitReply.challange.length) != 1)
{
krb5_set_error_string(context, "out of random error");
ret = ENOMEM;
goto out;
}
r.u.ntlmInitReply.targetinfo = NULL; /* XXX fix targetinfo */
/*
* Save data encryted in opaque for the second part of the
* ntlm authentication
*/
sp = krb5_storage_emem();
if (sp == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "out of memory");
goto out;
}
ret = krb5_storage_write(sp, r.u.ntlmInitReply.challange.data, 8);
if (ret != 8) {
ret = ENOMEM;
krb5_set_error_string(context, "storage write challange");
goto out;
}
ret = krb5_store_uint32(sp, r.u.ntlmInitReply.flags);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
ret = krb5_storage_to_data(sp, &buf);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
ret = get_digest_key(context, config, server, &crypto);
if (ret)
goto out;
ret = krb5_encrypt(context, crypto, KRB5_KU_DIGEST_OPAQUE,
buf.data, buf.length, &r.u.ntlmInitReply.opaque);
krb5_data_free(&buf);
krb5_crypto_destroy(context, crypto);
crypto = NULL;
if (ret)
goto out;
break;
}
case choice_DigestReqInner_ntlmRequest: {
krb5_principal clientprincipal;
unsigned char challange[8];
uint32_t flags;
r.element = choice_DigestRepInner_ntlmResponse;
r.u.ntlmResponse.success = 0;
r.u.ntlmResponse.flags = 0;
r.u.ntlmResponse.sessionkey = NULL;
r.u.ntlmResponse.tickets = NULL;
/* get username */
ret = krb5_parse_name(context,
ireq.u.ntlmRequest.username,
&clientprincipal);
if (ret)
goto out;
ret = _kdc_db_fetch(context, config, clientprincipal,
HDB_F_GET_CLIENT, NULL, &user);
krb5_free_principal(context, clientprincipal);
if (ret) {
krb5_set_error_string(context, "NTLM user %s not in database",
ireq.u.ntlmRequest.username);
goto out;
}
ret = get_digest_key(context, config, server, &crypto);
if (ret)
goto out;
ret = krb5_decrypt(context, crypto, KRB5_KU_DIGEST_OPAQUE,
ireq.u.ntlmRequest.opaque.data,
ireq.u.ntlmRequest.opaque.length, &buf);
krb5_crypto_destroy(context, crypto);
crypto = NULL;
if (ret)
goto out;
sp = krb5_storage_from_data(&buf);
if (sp == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "out of memory");
goto out;
}
ret = krb5_storage_read(sp, challange, sizeof(challange));
if (ret != sizeof(challange)) {
krb5_set_error_string(context, "NTLM storage read challange");
ret = ENOMEM;
goto out;
}
ret = krb5_ret_uint32(sp, &flags);
if (ret) {
krb5_set_error_string(context, "NTLM storage read flags");
goto out;
}
krb5_data_free(&buf);
if (flags & NTLM_NEG_NTLM) {
struct ntlm_buf answer;
Key *key;
ret = hdb_enctype2key(context, &user->entry,
ETYPE_ARCFOUR_HMAC_MD5, &key);
if (ret) {
krb5_set_error_string(context, "NTLM missing arcfour key");
goto out;
}
ret = heim_ntlm_calculate_ntlm1(key->key.keyvalue.data,
key->key.keyvalue.length,
challange, &answer);
if (ret) {
krb5_set_error_string(context, "NTLM missing arcfour key");
goto out;
}
if (ireq.u.ntlmRequest.ntlm.length != answer.length ||
memcmp(ireq.u.ntlmRequest.ntlm.data, answer.data, answer.length) != 0)
{
free(answer.data);
ret = EINVAL;
krb5_set_error_string(context, "NTLM hash mismatch");
goto out;
}
free(answer.data);
} else {
ret = EINVAL;
krb5_set_error_string(context, "NTLM not negotiated");
goto out;
}
r.u.ntlmResponse.success = 1;
kdc_log(context, config, 0, "NTLM successful for %s",
ireq.u.ntlmRequest.username);
break;
}
default:
r.element = choice_DigestRepInner_error;
r.u.error.reason = strdup("unknown operation");
if (r.u.error.reason == NULL) {
krb5_set_error_string(context, "out of memory");
ret = ENOMEM;
goto out;
}
r.u.error.code = EINVAL;
break;
}
ASN1_MALLOC_ENCODE(DigestRepInner, buf.data, buf.length, &r, &size, ret);
if (ret) {
krb5_set_error_string(context, "Failed to encode inner digest reply");
goto out;
}
if (size != buf.length)
krb5_abortx(context, "ASN1 internal error");
krb5_auth_con_addflags(context, ac, KRB5_AUTH_CONTEXT_USE_SUBKEY, NULL);
ret = krb5_mk_rep (context, ac, &rep.apRep);
if (ret)
goto out;
{
krb5_keyblock *key;
ret = krb5_auth_con_getlocalsubkey(context, ac, &key);
if (ret)
goto out;
ret = krb5_crypto_init(context, key, 0, &crypto);
krb5_free_keyblock (context, key);
if (ret)
goto out;
}
ret = krb5_encrypt_EncryptedData(context, crypto, KRB5_KU_DIGEST_ENCRYPT,
buf.data, buf.length, 0,
&rep.innerRep);
ASN1_MALLOC_ENCODE(DigestREP, reply->data, reply->length, &rep, &size, ret);
if (ret) {
krb5_set_error_string(context, "Failed to encode digest reply");
goto out;
}
if (size != reply->length)
krb5_abortx(context, "ASN1 internal error");
out:
if (ac)
krb5_auth_con_free(context, ac);
if (ret)
krb5_warn(context, ret, "Digest request from %s failed", from);
if (ticket)
krb5_free_ticket(context, ticket);
if (id)
krb5_kt_close(context, id);
if (crypto)
krb5_crypto_destroy(context, crypto);
if (sp)
krb5_storage_free(sp);
if (user)
_kdc_free_ent (context, user);
if (server)
_kdc_free_ent (context, server);
if (client)
_kdc_free_ent (context, client);
if (password) {
memset(password, 0, strlen(password));
free (password);
}
if (client_name)
free (client_name);
krb5_data_free(&buf);
krb5_data_free(&serverNonce);
free_DigestREP(&rep);
free_DigestRepInner(&r);
free_DigestReqInner(&ireq);
return ret;
}
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