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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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.
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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34 #include "gssapi_locl.h"
36 RCSID("$Id: decapsulate.c,v 1.7.6.1 2003/09/18 22:00:41 lha Exp $");
39 gssapi_krb5_verify_header(u_char **str,
43 size_t len, len_len, mech_len, foo;
48 return GSS_S_DEFECTIVE_TOKEN;
50 return GSS_S_DEFECTIVE_TOKEN;
51 e = der_get_length (p, total_len - 1, &len, &len_len);
52 if (e || 1 + len_len + len != total_len)
53 return GSS_S_DEFECTIVE_TOKEN;
56 return GSS_S_DEFECTIVE_TOKEN;
57 e = der_get_length (p, total_len - 1 - len_len - 1,
60 return GSS_S_DEFECTIVE_TOKEN;
62 if (mech_len != GSS_KRB5_MECHANISM->length)
63 return GSS_S_BAD_MECH;
65 GSS_KRB5_MECHANISM->elements,
66 GSS_KRB5_MECHANISM->length) != 0)
67 return GSS_S_BAD_MECH;
69 if (memcmp (p, type, 2) != 0)
70 return GSS_S_DEFECTIVE_TOKEN;
73 return GSS_S_COMPLETE;
77 gssapi_krb5_get_mech (const u_char *ptr,
79 const u_char **mech_ret)
81 size_t len, len_len, mech_len, foo;
82 const u_char *p = ptr;
89 e = der_get_length (p, total_len - 1, &len, &len_len);
90 if (e || 1 + len_len + len != total_len)
95 e = der_get_length (p, total_len - 1 - len_len - 1,
105 _gssapi_verify_mech_header(u_char **str,
111 mech_len = gssapi_krb5_get_mech (*str, total_len, &p);
113 return GSS_S_DEFECTIVE_TOKEN;
115 if (mech_len != GSS_KRB5_MECHANISM->length)
116 return GSS_S_BAD_MECH;
118 GSS_KRB5_MECHANISM->elements,
119 GSS_KRB5_MECHANISM->length) != 0)
120 return GSS_S_BAD_MECH;
123 return GSS_S_COMPLETE;
127 * Remove the GSS-API wrapping from `in_token' giving `out_data.
128 * Does not copy data, so just free `in_token'.
132 gssapi_krb5_decapsulate(
133 OM_uint32 *minor_status,
134 gss_buffer_t input_token_buffer,
142 p = input_token_buffer->value;
143 ret = gssapi_krb5_verify_header(&p,
144 input_token_buffer->length,
151 out_data->length = input_token_buffer->length -
152 (p - (u_char *)input_token_buffer->value);
154 return GSS_S_COMPLETE;
158 * Verify padding of a gss wrapped message and return its length.
162 _gssapi_verify_pad(gss_buffer_t wrapped_token,
170 pad = (u_char *)wrapped_token->value + wrapped_token->length - 1;
173 if (padlength > datalen)
174 return GSS_S_BAD_MECH;
176 for (i = padlength; i > 0 && *pad == padlength; i--, pad--)
179 return GSS_S_BAD_MIC;