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34 #include "gssapi_locl.h"
36 RCSID("$Id: verify_mic.c,v 1.32 2005/04/27 17:51:04 lha Exp $");
40 (OM_uint32 * minor_status,
41 const gss_ctx_id_t context_handle,
42 const gss_buffer_t message_buffer,
43 const gss_buffer_t token_buffer,
44 gss_qop_t * qop_state,
51 u_char hash[16], *seq;
52 DES_key_schedule schedule;
59 p = token_buffer->value;
60 ret = gssapi_krb5_verify_header (&p,
67 if (memcmp(p, "\x00\x00", 2) != 0)
70 if (memcmp (p, "\xff\xff\xff\xff", 4) != 0)
77 MD5_Update (&md5, p - 24, 8);
78 MD5_Update (&md5, message_buffer->value,
79 message_buffer->length);
80 MD5_Final (hash, &md5);
82 memset (&zero, 0, sizeof(zero));
83 memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
85 DES_set_key (&deskey, &schedule);
86 DES_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
88 if (memcmp (p - 8, hash, 8) != 0) {
89 memset (deskey, 0, sizeof(deskey));
90 memset (&schedule, 0, sizeof(schedule));
94 /* verify sequence number */
96 HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
99 DES_set_key (&deskey, &schedule);
100 DES_cbc_encrypt ((void *)p, (void *)p, 8,
101 &schedule, (DES_cblock *)hash, DES_DECRYPT);
103 memset (deskey, 0, sizeof(deskey));
104 memset (&schedule, 0, sizeof(schedule));
107 gssapi_decode_om_uint32(seq, &seq_number);
109 if (context_handle->more_flags & LOCAL)
110 cmp = memcmp(&seq[4], "\xff\xff\xff\xff", 4);
112 cmp = memcmp(&seq[4], "\x00\x00\x00\x00", 4);
115 HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
116 return GSS_S_BAD_MIC;
119 ret = _gssapi_msg_order_check(context_handle->order, seq_number);
121 HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
125 HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
127 return GSS_S_COMPLETE;
132 (OM_uint32 * minor_status,
133 const gss_ctx_id_t context_handle,
134 const gss_buffer_t message_buffer,
135 const gss_buffer_t token_buffer,
136 gss_qop_t * qop_state,
152 p = token_buffer->value;
153 ret = gssapi_krb5_verify_header (&p,
154 token_buffer->length,
160 if (memcmp(p, "\x04\x00", 2) != 0) /* SGN_ALG = HMAC SHA1 DES3-KD */
161 return GSS_S_BAD_SIG;
163 if (memcmp (p, "\xff\xff\xff\xff", 4) != 0)
164 return GSS_S_BAD_MIC;
167 ret = krb5_crypto_init(gssapi_krb5_context, key,
168 ETYPE_DES3_CBC_NONE, &crypto);
170 gssapi_krb5_set_error_string ();
172 return GSS_S_FAILURE;
175 /* verify sequence number */
181 memcpy(ivec, p + 8, 8);
183 ret = krb5_decrypt_ivec (gssapi_krb5_context,
186 p, 8, &seq_data, ivec);
189 gssapi_krb5_set_error_string ();
190 krb5_crypto_destroy (gssapi_krb5_context, crypto);
192 return GSS_S_FAILURE;
197 if (seq_data.length != 8) {
198 krb5_data_free (&seq_data);
200 krb5_crypto_destroy (gssapi_krb5_context, crypto);
201 return GSS_S_BAD_MIC;
206 HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
209 gssapi_decode_om_uint32(seq, &seq_number);
211 if (context_handle->more_flags & LOCAL)
212 cmp = memcmp(&seq[4], "\xff\xff\xff\xff", 4);
214 cmp = memcmp(&seq[4], "\x00\x00\x00\x00", 4);
216 krb5_data_free (&seq_data);
218 krb5_crypto_destroy (gssapi_krb5_context, crypto);
220 HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
221 return GSS_S_BAD_MIC;
224 ret = _gssapi_msg_order_check(context_handle->order, seq_number);
226 krb5_crypto_destroy (gssapi_krb5_context, crypto);
228 HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
232 /* verify checksum */
234 tmp = malloc (message_buffer->length + 8);
236 krb5_crypto_destroy (gssapi_krb5_context, crypto);
237 HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
238 *minor_status = ENOMEM;
239 return GSS_S_FAILURE;
242 memcpy (tmp, p - 8, 8);
243 memcpy (tmp + 8, message_buffer->value, message_buffer->length);
245 csum.cksumtype = CKSUMTYPE_HMAC_SHA1_DES3;
246 csum.checksum.length = 20;
247 csum.checksum.data = p + 8;
249 ret = krb5_verify_checksum (gssapi_krb5_context, crypto,
251 tmp, message_buffer->length + 8,
255 gssapi_krb5_set_error_string ();
256 krb5_crypto_destroy (gssapi_krb5_context, crypto);
258 HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
259 return GSS_S_BAD_MIC;
261 HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
263 krb5_crypto_destroy (gssapi_krb5_context, crypto);
264 return GSS_S_COMPLETE;
268 gss_verify_mic_internal
269 (OM_uint32 * minor_status,
270 const gss_ctx_id_t context_handle,
271 const gss_buffer_t message_buffer,
272 const gss_buffer_t token_buffer,
273 gss_qop_t * qop_state,
279 krb5_keytype keytype;
281 ret = gss_krb5_get_subkey(context_handle, &key);
283 gssapi_krb5_set_error_string ();
285 return GSS_S_FAILURE;
288 krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
291 ret = verify_mic_des (minor_status, context_handle,
292 message_buffer, token_buffer, qop_state, key,
296 ret = verify_mic_des3 (minor_status, context_handle,
297 message_buffer, token_buffer, qop_state, key,
300 case KEYTYPE_ARCFOUR :
301 case KEYTYPE_ARCFOUR_56 :
302 ret = _gssapi_verify_mic_arcfour (minor_status, context_handle,
303 message_buffer, token_buffer,
304 qop_state, key, type);
307 ret = _gssapi_verify_mic_cfx (minor_status, context_handle,
308 message_buffer, token_buffer, qop_state,
312 krb5_free_keyblock (gssapi_krb5_context, key);
319 (OM_uint32 * minor_status,
320 const gss_ctx_id_t context_handle,
321 const gss_buffer_t message_buffer,
322 const gss_buffer_t token_buffer,
323 gss_qop_t * qop_state
328 if (qop_state != NULL)
329 *qop_state = GSS_C_QOP_DEFAULT;
331 ret = gss_verify_mic_internal(minor_status, context_handle,
332 message_buffer, token_buffer,
333 qop_state, "\x01\x01");