2 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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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 (ct_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;