2 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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7 * modification, are permitted provided that the following conditions
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18 * may be used to endorse or promote products derived from this software
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34 #include "gssapi_locl.h"
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
,
50 u_char hash
[16], seq_data
[8];
51 des_key_schedule schedule
;
57 p
= token_buffer
->value
;
58 ret
= gssapi_krb5_verify_header (&p
,
64 if (memcmp(p
, "\x00\x00", 2) != 0)
67 if (memcmp (p
, "\xff\xff\xff\xff", 4) != 0)
74 MD5_Update (&md5
, p
- 24, 8);
75 MD5_Update (&md5
, message_buffer
->value
,
76 message_buffer
->length
);
77 MD5_Final (hash
, &md5
);
79 memset (&zero
, 0, sizeof(zero
));
80 memcpy (&deskey
, key
->keyvalue
.data
, sizeof(deskey
));
82 des_set_key (&deskey
, schedule
);
83 des_cbc_cksum ((void *)hash
, (void *)hash
, sizeof(hash
),
85 if (memcmp (p
- 8, hash
, 8) != 0) {
86 memset (deskey
, 0, sizeof(deskey
));
87 memset (schedule
, 0, sizeof(schedule
));
91 /* verify sequence number */
93 krb5_auth_getremoteseqnumber (gssapi_krb5_context
,
94 context_handle
->auth_context
,
96 seq_data
[0] = (seq_number
>> 0) & 0xFF;
97 seq_data
[1] = (seq_number
>> 8) & 0xFF;
98 seq_data
[2] = (seq_number
>> 16) & 0xFF;
99 seq_data
[3] = (seq_number
>> 24) & 0xFF;
100 memset (seq_data
+ 4,
101 (context_handle
->more_flags
& LOCAL
) ? 0xFF : 0,
105 des_set_key (&deskey
, schedule
);
106 des_cbc_encrypt ((void *)p
, (void *)p
, 8,
107 schedule
, (des_cblock
*)hash
, DES_DECRYPT
);
109 memset (deskey
, 0, sizeof(deskey
));
110 memset (schedule
, 0, sizeof(schedule
));
112 if (memcmp (p
, seq_data
, 8) != 0) {
113 return GSS_S_BAD_MIC
;
116 krb5_auth_con_setremoteseqnumber (gssapi_krb5_context
,
117 context_handle
->auth_context
,
120 return GSS_S_COMPLETE
;
125 (OM_uint32
* minor_status
,
126 const gss_ctx_id_t context_handle
,
127 const gss_buffer_t message_buffer
,
128 const gss_buffer_t token_buffer
,
129 gss_qop_t
* qop_state
,
143 p
= token_buffer
->value
;
144 ret
= gssapi_krb5_verify_header (&p
,
145 token_buffer
->length
,
150 if (memcmp(p
, "\x04\x00", 2) != 0) /* SGN_ALG = HMAC SHA1 DES3-KD */
151 return GSS_S_BAD_SIG
;
153 if (memcmp (p
, "\xff\xff\xff\xff", 4) != 0)
154 return GSS_S_BAD_MIC
;
157 ret
= krb5_crypto_init(gssapi_krb5_context
, key
,
158 ETYPE_DES3_CBC_NONE
, &crypto
);
160 gssapi_krb5_set_error_string ();
162 return GSS_S_FAILURE
;
165 /* verify sequence number */
167 ret
= krb5_decrypt (gssapi_krb5_context
,
172 gssapi_krb5_set_error_string ();
173 krb5_crypto_destroy (gssapi_krb5_context
, crypto
);
175 return GSS_S_FAILURE
;
178 if (seq_data
.length
!= 8) {
179 krb5_crypto_destroy (gssapi_krb5_context
, crypto
);
180 krb5_data_free (&seq_data
);
181 return GSS_S_BAD_MIC
;
184 krb5_auth_getremoteseqnumber (gssapi_krb5_context
,
185 context_handle
->auth_context
,
187 seq
[0] = (seq_number
>> 0) & 0xFF;
188 seq
[1] = (seq_number
>> 8) & 0xFF;
189 seq
[2] = (seq_number
>> 16) & 0xFF;
190 seq
[3] = (seq_number
>> 24) & 0xFF;
192 (context_handle
->more_flags
& LOCAL
) ? 0xFF : 0,
194 cmp
= memcmp (seq
, seq_data
.data
, seq_data
.length
);
195 krb5_data_free (&seq_data
);
197 krb5_crypto_destroy (gssapi_krb5_context
, crypto
);
198 return GSS_S_BAD_MIC
;
201 /* verify checksum */
203 tmp
= malloc (message_buffer
->length
+ 8);
205 krb5_crypto_destroy (gssapi_krb5_context
, crypto
);
206 *minor_status
= ENOMEM
;
207 return GSS_S_FAILURE
;
210 memcpy (tmp
, p
- 8, 8);
211 memcpy (tmp
+ 8, message_buffer
->value
, message_buffer
->length
);
213 csum
.cksumtype
= CKSUMTYPE_HMAC_SHA1_DES3
;
214 csum
.checksum
.length
= 20;
215 csum
.checksum
.data
= p
+ 8;
217 ret
= krb5_verify_checksum (gssapi_krb5_context
, crypto
,
219 tmp
, message_buffer
->length
+ 8,
223 gssapi_krb5_set_error_string ();
224 krb5_crypto_destroy (gssapi_krb5_context
, crypto
);
226 return GSS_S_BAD_MIC
;
229 krb5_auth_con_setremoteseqnumber (gssapi_krb5_context
,
230 context_handle
->auth_context
,
233 krb5_crypto_destroy (gssapi_krb5_context
, crypto
);
234 return GSS_S_COMPLETE
;
239 (OM_uint32
* minor_status
,
240 const gss_ctx_id_t context_handle
,
241 const gss_buffer_t message_buffer
,
242 const gss_buffer_t token_buffer
,
243 gss_qop_t
* qop_state
248 krb5_keytype keytype
;
250 ret
= gss_krb5_get_remotekey(context_handle
, &key
);
252 gssapi_krb5_set_error_string ();
254 return GSS_S_FAILURE
;
256 krb5_enctype_to_keytype (gssapi_krb5_context
, key
->keytype
, &keytype
);
259 ret
= verify_mic_des (minor_status
, context_handle
,
260 message_buffer
, token_buffer
, qop_state
, key
);
263 ret
= verify_mic_des3 (minor_status
, context_handle
,
264 message_buffer
, token_buffer
, qop_state
, key
);
267 *minor_status
= KRB5_PROG_ETYPE_NOSUPP
;
271 krb5_free_keyblock (gssapi_krb5_context
, key
);