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 typedef struct kdc_request_desc *kdc_request_t;
  48
  49 #include <kdc-private.h>
  50
  51 krb5_kdc_configuration *config;
  52
  53 static void
  54 ntlm_service(void *ctx, const heim_idata *req,
  55              const heim_icred cred,
  56              heim_ipc_complete complete,
  57              heim_sipc_call cctx)
  58 {
  59     NTLMRequest2 ntq;
  60     unsigned char sessionkey[16];
  61     heim_idata rep = { 0, NULL };
  62     krb5_context context = ctx;
  63     hdb_entry_ex *user = NULL;
  64     Key *key = NULL;
  65     NTLMReply ntp;
  66     size_t size;
  67     int ret;
  68     const char *domain;
  69
  70     kdc_log(context, config, 1, "digest-request: uid=%d",
  71             (int)heim_ipc_cred_get_uid(cred));
  72
  73     if (heim_ipc_cred_get_uid(cred) != 0) {
  74         (*complete)(cctx, EPERM, NULL);
  75         return;
  76     }
  77
  78     ntp.success = 0;
  79     ntp.flags = 0;
  80     ntp.sessionkey = NULL;
  81
  82     ret = decode_NTLMRequest2(req->data, req->length, &ntq, NULL);
  83     if (ret)
  84         goto failed;
  85
  86     /* XXX forward to NetrLogonSamLogonEx() if not a local domain */
  87     if (strcmp(ntq.loginDomainName, "BUILTIN") == 0) {
  88         domain = ntq.loginDomainName;
  89     } else if (strcmp(ntq.loginDomainName, "") == 0) {
  90         domain = "BUILTIN";
  91     } else {
  92         ret = EINVAL;
  93         goto failed;
  94     }
  95
  96     kdc_log(context, config, 1, "digest-request: user=%s/%s",
  97             ntq.loginUserName, domain);
  98
  99     if (ntq.lmchallenge.length != 8)
 100         goto failed;
 101
 102     if (ntq.ntChallengeResponce.length == 0)
 103         goto failed;
 104
 105     {
 106         krb5_principal client;
 107
 108         ret = krb5_make_principal(context, &client, domain,
 109                                   ntq.loginUserName, NULL);
 110         if (ret)
 111             goto failed;
 112
 113         krb5_principal_set_type(context, client, KRB5_NT_NTLM);
 114
 115         ret = _kdc_db_fetch(context, config, client,
 116                             HDB_F_GET_CLIENT, NULL, NULL, &user);
 117         krb5_free_principal(context, client);
 118         if (ret)
 119             goto failed;
 120
 121         ret = hdb_enctype2key(context, &user->entry, NULL,
 122                               ETYPE_ARCFOUR_HMAC_MD5, &key);
 123         if (ret) {
 124             krb5_set_error_message(context, ret, "NTLM missing arcfour key");
 125             goto failed;
 126         }
 127     }
 128
 129     kdc_log(context, config, 2,
 130             "digest-request: found user, processing ntlm request", ret);
 131
 132     if (ntq.ntChallengeResponce.length != 24) {
 133         struct ntlm_buf infotarget, answer;
 134
 135         answer.length = ntq.ntChallengeResponce.length;
 136         answer.data = ntq.ntChallengeResponce.data;
 137
 138         ret = heim_ntlm_verify_ntlm2(key->key.keyvalue.data,
 139                                      key->key.keyvalue.length,
 140                                      ntq.loginUserName,
 141                                      ntq.loginDomainName,
 142                                      0,
 143                                      ntq.lmchallenge.data,
 144                                      &answer,
 145                                      &infotarget,
 146                                      sessionkey);
 147         if (ret) {
 148             goto failed;
 149         }
 150
 151         free(infotarget.data);
 152         /* XXX verify info target */
 153
 154     } else {
 155         struct ntlm_buf answer;
 156
 157         if (ntq.flags & NTLM_NEG_NTLM2_SESSION) {
 158             unsigned char sessionhash[MD5_DIGEST_LENGTH];
 159             EVP_MD_CTX *md5ctx;
 160
 161             /* the first first 8 bytes is the challenge, what is the other 16 bytes ? */
 162             if (ntq.lmChallengeResponce.length != 24)
 163                 goto failed;
 164
 165             md5ctx = EVP_MD_CTX_create();
 166             EVP_DigestInit_ex(md5ctx, EVP_md5(), NULL);
 167             EVP_DigestUpdate(md5ctx, ntq.lmchallenge.data, 8);
 168             EVP_DigestUpdate(md5ctx, ntq.lmChallengeResponce.data, 8);
 169             EVP_DigestFinal_ex(md5ctx, sessionhash, NULL);
 170             EVP_MD_CTX_destroy(md5ctx);
 171             memcpy(ntq.lmchallenge.data, sessionhash, ntq.lmchallenge.length);
 172         }
 173
 174         ret = heim_ntlm_calculate_ntlm1(key->key.keyvalue.data,
 175                                         key->key.keyvalue.length,
 176                                         ntq.lmchallenge.data, &answer);
 177         if (ret)
 178             goto failed;
 179
 180         if (ntq.ntChallengeResponce.length != answer.length ||
 181             memcmp(ntq.ntChallengeResponce.data, answer.data, answer.length) != 0) {
 182             free(answer.data);
 183             ret = EINVAL;
 184             goto failed;
 185         }
 186         free(answer.data);
 187
 188         {
 189             EVP_MD_CTX *ctxp;
 190
 191             ctxp = EVP_MD_CTX_create();
 192             EVP_DigestInit_ex(ctxp, EVP_md4(), NULL);
 193             EVP_DigestUpdate(ctxp, key->key.keyvalue.data, key->key.keyvalue.length);
 194             EVP_DigestFinal_ex(ctxp, sessionkey, NULL);
 195             EVP_MD_CTX_destroy(ctxp);
 196         }
 197     }
 198
 199     ntp.success = 1;
 200
 201     ASN1_MALLOC_ENCODE(NTLMReply, rep.data, rep.length, &ntp, &size, ret);
 202     if (ret)
 203         goto failed;
 204     if (rep.length != size)
 205         abort();
 206
 207   failed:
 208     kdc_log(context, config, 1, "digest-request: %d", ret);
 209
 210     (*complete)(cctx, ret, &rep);
 211
 212     free(rep.data);
 213
 214     free_NTLMRequest2(&ntq);
 215     if (user)
 216         _kdc_free_ent (context, user);
 217 }
 218
 219 static int help_flag;
 220 static int version_flag;
 221
 222 static struct getargs args[] = {
 223     {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
 224     {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
 225 };
 226
 227 static int num_args = sizeof(args) / sizeof(args[0]);
 228
 229 static void
 230 usage(int ret)
 231 {
 232     arg_printusage (args, num_args, NULL, "");
 233     exit (ret);
 234 }
 235
 236 int
 237 main(int argc, char **argv)
 238 {
 239     krb5_context context;
 240     int ret, optidx = 0;
 241
 242     setprogname(argv[0]);
 243
 244     if (getarg(args, num_args, argc, argv, &optidx))
 245         usage(1);
 246
 247     if (help_flag)
 248         usage(0);
 249
 250     if (version_flag) {
 251         print_version(NULL);
 252         exit(0);
 253     }
 254
 255     ret = krb5_init_context(&context);
 256     if (ret)
 257         krb5_errx(context, 1, "krb5_init_context");
 258
 259     ret = krb5_kdc_get_config(context, &config);
 260     if (ret)
 261         krb5_err(context, 1, ret, "krb5_kdc_default_config");
 262
 263     kdc_openlog(context, "digest-service", config);
 264
 265     ret = krb5_kdc_set_dbinfo(context, config);
 266     if (ret)
 267         krb5_err(context, 1, ret, "krb5_kdc_set_dbinfo");
 268
 269 #if __APPLE__
 270     {
 271         heim_sipc mach;
 272         heim_sipc_launchd_mach_init("org.h5l.ntlm-service",
 273                                     ntlm_service, context, &mach);
 274         heim_sipc_timeout(60);
 275     }
 276 #endif
 277     {
 278         heim_sipc un;
 279         heim_sipc_service_unix("org.h5l.ntlm-service", ntlm_service, NULL, &un);
 280     }
 281
 282     heim_ipc_main();
 283     return 0;
 284 }