kdc/digest-service.c

   1 /*
   2  * Copyright (c) 2006 - 2007 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #define HC_DEPRECATED_CRYPTO
  37
  38 #include "headers.h"
  39 #include <digest_asn1.h>
  40 #include <heimntlm.h>
  41 #include <heim-ipc.h>
  42 #include <getarg.h>
  43
  44 typedef struct pk_client_params pk_client_params;
  45 struct DigestREQ;
  46 struct Kx509Request;
  47
  48 #include <kdc-private.h>
  49
  50 krb5_kdc_configuration *config;
  51
  52 static void
  53 ntlm_service(void *ctx, const heim_idata *req,
  54              const heim_icred cred,
  55              heim_ipc_complete complete,
  56              heim_sipc_call cctx)
  57 {
  58     NTLMRequest2 ntq;
  59     unsigned char sessionkey[16];
  60     heim_idata rep = { 0, NULL };
  61     krb5_context context = ctx;
  62     hdb_entry_ex *user = NULL;
  63     Key *key = NULL;
  64     NTLMReply ntp;
  65     size_t size;
  66     int ret;
  67     const char *domain;
  68
  69     kdc_log(context, config, 4, "digest-request: uid=%d",
  70             (int)heim_ipc_cred_get_uid(cred));
  71
  72     if (heim_ipc_cred_get_uid(cred) != 0) {
  73         (*complete)(cctx, EPERM, NULL);
  74         return;
  75     }
  76
  77     ntp.success = 0;
  78     ntp.flags = 0;
  79     ntp.sessionkey = NULL;
  80
  81     ret = decode_NTLMRequest2(req->data, req->length, &ntq, NULL);
  82     if (ret)
  83         goto failed;
  84
  85     /* XXX forward to NetrLogonSamLogonEx() if not a local domain */
  86     if (strcmp(ntq.loginDomainName, "BUILTIN") == 0) {
  87         domain = ntq.loginDomainName;
  88     } else if (strcmp(ntq.loginDomainName, "") == 0) {
  89         domain = "BUILTIN";
  90     } else {
  91         ret = EINVAL;
  92         goto failed;
  93     }
  94
  95     kdc_log(context, config, 4, "digest-request: user=%s/%s",
  96             ntq.loginUserName, domain);
  97
  98     if (ntq.lmchallenge.length != 8)
  99         goto failed;
 100
 101     if (ntq.ntChallengeResponce.length == 0)
 102         goto failed;
 103
 104     {
 105         krb5_principal client;
 106
 107         ret = krb5_make_principal(context, &client, domain,
 108                                   ntq.loginUserName, NULL);
 109         if (ret)
 110             goto failed;
 111
 112         krb5_principal_set_type(context, client, KRB5_NT_NTLM);
 113
 114         ret = _kdc_db_fetch(context, config, client,
 115                             HDB_F_GET_CLIENT, NULL, NULL, &user);
 116         krb5_free_principal(context, client);
 117         if (ret)
 118             goto failed;
 119
 120         ret = hdb_enctype2key(context, &user->entry, NULL,
 121                               ETYPE_ARCFOUR_HMAC_MD5, &key);
 122         if (ret) {
 123             krb5_set_error_message(context, ret, "NTLM missing arcfour key");
 124             goto failed;
 125         }
 126     }
 127
 128     kdc_log(context, config, 5,
 129             "digest-request: found user, processing ntlm request");
 130
 131     if (ntq.ntChallengeResponce.length != 24) {
 132         struct ntlm_buf infotarget, answer;
 133
 134         answer.length = ntq.ntChallengeResponce.length;
 135         answer.data = ntq.ntChallengeResponce.data;
 136
 137         ret = heim_ntlm_verify_ntlm2(key->key.keyvalue.data,
 138                                      key->key.keyvalue.length,
 139                                      ntq.loginUserName,
 140                                      ntq.loginDomainName,
 141                                      0,
 142                                      ntq.lmchallenge.data,
 143                                      &answer,
 144                                      &infotarget,
 145                                      sessionkey);
 146         if (ret) {
 147             goto failed;
 148         }
 149
 150         free(infotarget.data);
 151         /* XXX verify info target */
 152
 153     } else {
 154         struct ntlm_buf answer;
 155
 156         if (ntq.flags & NTLM_NEG_NTLM2_SESSION) {
 157             unsigned char sessionhash[MD5_DIGEST_LENGTH];
 158             EVP_MD_CTX *md5ctx;
 159
 160             /* the first first 8 bytes is the challenge, what is the other 16 bytes ? */
 161             if (ntq.lmChallengeResponce.length != 24)
 162                 goto failed;
 163
 164             md5ctx = EVP_MD_CTX_create();
 165             EVP_DigestInit_ex(md5ctx, EVP_md5(), NULL);
 166             EVP_DigestUpdate(md5ctx, ntq.lmchallenge.data, 8);
 167             EVP_DigestUpdate(md5ctx, ntq.lmChallengeResponce.data, 8);
 168             EVP_DigestFinal_ex(md5ctx, sessionhash, NULL);
 169             EVP_MD_CTX_destroy(md5ctx);
 170             memcpy(ntq.lmchallenge.data, sessionhash, ntq.lmchallenge.length);
 171         }
 172
 173         ret = heim_ntlm_calculate_ntlm1(key->key.keyvalue.data,
 174                                         key->key.keyvalue.length,
 175                                         ntq.lmchallenge.data, &answer);
 176         if (ret)
 177             goto failed;
 178
 179         if (ntq.ntChallengeResponce.length != answer.length ||
 180             memcmp(ntq.ntChallengeResponce.data, answer.data, answer.length) != 0) {
 181             free(answer.data);
 182             ret = EINVAL;
 183             goto failed;
 184         }
 185         free(answer.data);
 186
 187         {
 188             EVP_MD_CTX *ctxp;
 189
 190             ctxp = EVP_MD_CTX_create();
 191             EVP_DigestInit_ex(ctxp, EVP_md4(), NULL);
 192             EVP_DigestUpdate(ctxp, key->key.keyvalue.data, key->key.keyvalue.length);
 193             EVP_DigestFinal_ex(ctxp, sessionkey, NULL);
 194             EVP_MD_CTX_destroy(ctxp);
 195         }
 196     }
 197
 198     ntp.success = 1;
 199
 200     ASN1_MALLOC_ENCODE(NTLMReply, rep.data, rep.length, &ntp, &size, ret);
 201     if (ret)
 202         goto failed;
 203     if (rep.length != size)
 204         abort();
 205
 206   failed:
 207     kdc_log(context, config, 4, "digest-request: %d", ret);
 208
 209     (*complete)(cctx, ret, &rep);
 210
 211     free(rep.data);
 212
 213     free_NTLMRequest2(&ntq);
 214     if (user)
 215         _kdc_free_ent (context, user);
 216 }
 217
 218 static int help_flag;
 219 static int version_flag;
 220
 221 static struct getargs args[] = {
 222     {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
 223     {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
 224 };
 225
 226 static int num_args = sizeof(args) / sizeof(args[0]);
 227
 228 static void
 229 usage(int ret)
 230 {
 231     arg_printusage (args, num_args, NULL, "");
 232     exit (ret);
 233 }
 234
 235 int
 236 main(int argc, char **argv)
 237 {
 238     krb5_context context;
 239     int ret, optidx = 0;
 240
 241     setprogname(argv[0]);
 242
 243     if (getarg(args, num_args, argc, argv, &optidx))
 244         usage(1);
 245
 246     if (help_flag)
 247         usage(0);
 248
 249     if (version_flag) {
 250         print_version(NULL);
 251         exit(0);
 252     }
 253
 254     ret = krb5_init_context(&context);
 255     if (ret)
 256         krb5_errx(context, 1, "krb5_init_context");
 257
 258     ret = krb5_kdc_get_config(context, &config);
 259     if (ret)
 260         krb5_err(context, 1, ret, "krb5_kdc_default_config");
 261
 262     kdc_openlog(context, "digest-service", config);
 263
 264     ret = krb5_kdc_set_dbinfo(context, config);
 265     if (ret)
 266         krb5_err(context, 1, ret, "krb5_kdc_set_dbinfo");
 267
 268 #if __APPLE__
 269     {
 270         heim_sipc mach;
 271         heim_sipc_launchd_mach_init("org.h5l.ntlm-service",
 272                                     ntlm_service, context, &mach);
 273         heim_sipc_timeout(60);
 274     }
 275 #endif
 276 #ifdef HAVE_DOOR_CREATE
 277     {
 278         heim_sipc door;
 279         heim_sipc_service_door("org.h5l.ntlm-service", ntlm_service, NULL, &door);
 280     }
 281 #endif
 282     {
 283         heim_sipc un;
 284         heim_sipc_service_unix("org.h5l.ntlm-service", ntlm_service, NULL, &un);
 285     }
 286
 287     heim_ipc_main();
 288     return 0;
 289 }