2 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "gsskrb5_locl.h"
37 * return the length of the mechanism in token or -1
38 * (which implies that the token was bad - GSS_S_DEFECTIVE_TOKEN
42 _gsskrb5_get_mech (const u_char
*ptr
,
44 const u_char
**mech_ret
)
46 size_t len
, len_len
, mech_len
, foo
;
47 const u_char
*p
= ptr
;
54 e
= der_get_length (p
, total_len
- 1, &len
, &len_len
);
55 if (e
|| 1 + len_len
+ len
!= total_len
)
60 e
= der_get_length (p
, total_len
- 1 - len_len
- 1,
70 _gssapi_verify_mech_header(u_char
**str
,
77 mech_len
= _gsskrb5_get_mech (*str
, total_len
, &p
);
79 return GSS_S_DEFECTIVE_TOKEN
;
81 if (mech_len
!= mech
->length
)
82 return GSS_S_BAD_MECH
;
86 return GSS_S_BAD_MECH
;
89 return GSS_S_COMPLETE
;
93 _gsskrb5_verify_header(u_char
**str
,
102 ret
= _gssapi_verify_mech_header(str
, total_len
, oid
);
106 len
= total_len
- (*str
- p
);
109 return GSS_S_DEFECTIVE_TOKEN
;
111 if (memcmp (*str
, type
, 2) != 0)
112 return GSS_S_DEFECTIVE_TOKEN
;
119 * Remove the GSS-API wrapping from `in_token' giving `out_data.
120 * Does not copy data, so just free `in_token'.
125 OM_uint32
*minor_status
,
126 gss_buffer_t input_token_buffer
,
134 p
= input_token_buffer
->value
;
135 ret
= _gssapi_verify_mech_header(&p
,
136 input_token_buffer
->length
,
143 out_data
->length
= input_token_buffer
->length
-
144 (p
- (u_char
*)input_token_buffer
->value
);
146 return GSS_S_COMPLETE
;
150 * Remove the GSS-API wrapping from `in_token' giving `out_data.
151 * Does not copy data, so just free `in_token'.
155 _gsskrb5_decapsulate(OM_uint32
*minor_status
,
156 gss_buffer_t input_token_buffer
,
164 p
= input_token_buffer
->value
;
165 ret
= _gsskrb5_verify_header(&p
,
166 input_token_buffer
->length
,
174 out_data
->length
= input_token_buffer
->length
-
175 (p
- (u_char
*)input_token_buffer
->value
);
177 return GSS_S_COMPLETE
;
181 * Verify padding of a gss wrapped message and return its length.
185 _gssapi_verify_pad(gss_buffer_t wrapped_token
,
193 pad
= (u_char
*)wrapped_token
->value
+ wrapped_token
->length
- 1;
196 if (padlength
> datalen
)
197 return GSS_S_BAD_MECH
;
199 for (i
= padlength
; i
> 0 && *pad
== padlength
; i
--, pad
--)
202 return GSS_S_BAD_MIC
;