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 #include <kdc-private.h>
  48
  49 krb5_kdc_configuration *config;
  50
  51 static void
  52 ntlm_service(void *ctx, const heim_idata *req,
  53              const heim_icred cred,
  54              heim_ipc_complete complete,
  55              heim_sipc_call cctx)
  56 {
  57     NTLMRequest2 ntq;
  58     unsigned char sessionkey[16];
  59     heim_idata rep = { 0, NULL };
  60     krb5_context context = ctx;
  61     hdb_entry_ex *user = NULL;
  62     Key *key = NULL;
  63     NTLMReply ntp;
  64     size_t size;
  65     int ret;
  66     const char *domain;
  67
  68     kdc_log(context, config, 1, "digest-request: uid=%d",
  69             (int)heim_ipc_cred_get_uid(cred));
  70
  71     if (heim_ipc_cred_get_uid(cred) != 0) {
  72         (*complete)(cctx, EPERM, NULL);
  73         return;
  74     }
  75
  76     ntp.success = 0;
  77     ntp.flags = 0;
  78     ntp.sessionkey = NULL;
  79
  80     ret = decode_NTLMRequest2(req->data, req->length, &ntq, NULL);
  81     if (ret)
  82         goto failed;
  83
  84     /* XXX forward to NetrLogonSamLogonEx() if not a local domain */
  85     if (strcmp(ntq.loginDomainName, "BUILTIN") == 0) {
  86         domain = ntq.loginDomainName;
  87     } else if (strcmp(ntq.loginDomainName, "") == 0) {
  88         domain = "BUILTIN";
  89     } else {
  90         ret = EINVAL;
  91         goto failed;
  92     }
  93
  94     kdc_log(context, config, 1, "digest-request: user=%s/%s",
  95             ntq.loginUserName, domain);
  96
  97     if (ntq.lmchallenge.length != 8)
  98         goto failed;
  99
 100     if (ntq.ntChallengeResponce.length == 0)
 101         goto failed;
 102
 103     {
 104         krb5_principal client;
 105
 106         ret = krb5_make_principal(context, &client, domain,
 107                                   ntq.loginUserName, NULL);
 108         if (ret)
 109             goto failed;
 110
 111         krb5_principal_set_type(context, client, KRB5_NT_NTLM);
 112
 113         ret = _kdc_db_fetch(context, config, client,
 114                             HDB_F_GET_CLIENT, NULL, NULL, &user);
 115         krb5_free_principal(context, client);
 116         if (ret)
 117             goto failed;
 118
 119         ret = hdb_enctype2key(context, &user->entry,
 120                               ETYPE_ARCFOUR_HMAC_MD5, &key);
 121         if (ret) {
 122             krb5_set_error_message(context, ret, "NTLM missing arcfour key");
 123             goto failed;
 124         }
 125     }
 126
 127     kdc_log(context, config, 2,
 128             "digest-request: found user, processing ntlm request", ret);
 129
 130     if (ntq.ntChallengeResponce.length != 24) {
 131         struct ntlm_buf infotarget, answer;
 132
 133         answer.length = ntq.ntChallengeResponce.length;
 134         answer.data = ntq.ntChallengeResponce.data;
 135
 136         ret = heim_ntlm_verify_ntlm2(key->key.keyvalue.data,
 137                                      key->key.keyvalue.length,
 138                                      ntq.loginUserName,
 139                                      ntq.loginDomainName,
 140                                      0,
 141                                      ntq.lmchallenge.data,
 142                                      &answer,
 143                                      &infotarget,
 144                                      sessionkey);
 145         if (ret) {
 146             goto failed;
 147         }
 148
 149         free(infotarget.data);
 150         /* XXX verify info target */
 151
 152     } else {
 153         struct ntlm_buf answer;
 154
 155         if (ntq.flags & NTLM_NEG_NTLM2_SESSION) {
 156             unsigned char sessionhash[MD5_DIGEST_LENGTH];
 157             EVP_MD_CTX *md5ctx;
 158
 159             /* the first first 8 bytes is the challenge, what is the other 16 bytes ? */
 160             if (ntq.lmChallengeResponce.length != 24)
 161                 goto failed;
 162
 163             md5ctx = EVP_MD_CTX_create();
 164             EVP_DigestInit_ex(md5ctx, EVP_md5(), NULL);
 165             EVP_DigestUpdate(md5ctx, ntq.lmchallenge.data, 8);
 166             EVP_DigestUpdate(md5ctx, ntq.lmChallengeResponce.data, 8);
 167             EVP_DigestFinal_ex(md5ctx, sessionhash, NULL);
 168             EVP_MD_CTX_destroy(md5ctx);
 169             memcpy(ntq.lmchallenge.data, sessionhash, ntq.lmchallenge.length);
 170         }
 171
 172         ret = heim_ntlm_calculate_ntlm1(key->key.keyvalue.data,
 173                                         key->key.keyvalue.length,
 174                                         ntq.lmchallenge.data, &answer);
 175         if (ret)
 176             goto failed;
 177
 178         if (ntq.ntChallengeResponce.length != answer.length ||
 179             memcmp(ntq.ntChallengeResponce.data, answer.data, answer.length) != 0) {
 180             free(answer.data);
 181             ret = EINVAL;
 182             goto failed;
 183         }
 184         free(answer.data);
 185
 186         {
 187             EVP_MD_CTX *ctxp;
 188
 189             ctxp = EVP_MD_CTX_create();
 190             EVP_DigestInit_ex(ctxp, EVP_md4(), NULL);
 191             EVP_DigestUpdate(ctxp, key->key.keyvalue.data, key->key.keyvalue.length);
 192             EVP_DigestFinal_ex(ctxp, sessionkey, NULL);
 193             EVP_MD_CTX_destroy(ctxp);
 194         }
 195     }
 196
 197     ntp.success = 1;
 198
 199     ASN1_MALLOC_ENCODE(NTLMReply, rep.data, rep.length, &ntp, &size, ret);
 200     if (ret)
 201         goto failed;
 202     if (rep.length != size)
 203         abort();
 204
 205   failed:
 206     kdc_log(context, config, 1, "digest-request: %d", ret);
 207
 208     (*complete)(cctx, ret, &rep);
 209
 210     free(rep.data);
 211
 212     free_NTLMRequest2(&ntq);
 213     if (user)
 214         _kdc_free_ent (context, user);
 215 }
 216
 217 static int help_flag;
 218 static int version_flag;
 219
 220 static struct getargs args[] = {
 221     {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
 222     {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
 223 };
 224
 225 static int num_args = sizeof(args) / sizeof(args[0]);
 226
 227 static void
 228 usage(int ret)
 229 {
 230     arg_printusage (args, num_args, NULL, "");
 231     exit (ret);
 232 }
 233
 234 int
 235 main(int argc, char **argv)
 236 {
 237     krb5_context context;
 238     int ret, optidx = 0;
 239
 240     setprogname(argv[0]);
 241
 242     if (getarg(args, num_args, argc, argv, &optidx))
 243         usage(1);
 244
 245     if (help_flag)
 246         usage(0);
 247
 248     if (version_flag) {
 249         print_version(NULL);
 250         exit(0);
 251     }
 252
 253     ret = krb5_init_context(&context);
 254     if (ret)
 255         krb5_errx(context, 1, "krb5_init_context");
 256
 257     ret = krb5_kdc_get_config(context, &config);
 258     if (ret)
 259         krb5_err(context, 1, ret, "krb5_kdc_default_config");
 260
 261     kdc_openlog(context, "digest-service", config);
 262
 263     ret = krb5_kdc_set_dbinfo(context, config);
 264     if (ret)
 265         krb5_err(context, 1, ret, "krb5_kdc_set_dbinfo");
 266
 267 #if __APPLE__
 268     {
 269         heim_sipc mach;
 270         heim_sipc_launchd_mach_init("org.h5l.ntlm-service",
 271                                     ntlm_service, context, &mach);
 272         heim_sipc_timeout(60);
 273     }
 274 #endif
 275     {
 276         heim_sipc un;
 277         heim_sipc_service_unix("org.h5l.ntlm-service", ntlm_service, NULL, &un);
 278     }
 279
 280     heim_ipc_main();
 281     return 0;
 282 }