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34 #include "krb5/gsskrb5_locl.h"
36 RCSID("$Id: decapsulate.c 18334 2006-10-07 22:16:04Z lha $");
39 * return the length of the mechanism in token or -1
40 * (which implies that the token was bad - GSS_S_DEFECTIVE_TOKEN
44 _gsskrb5_get_mech (const u_char *ptr,
46 const u_char **mech_ret)
48 size_t len, len_len, mech_len, foo;
49 const u_char *p = ptr;
56 e = der_get_length (p, total_len - 1, &len, &len_len);
57 if (e || 1 + len_len + len != total_len)
62 e = der_get_length (p, total_len - 1 - len_len - 1,
72 _gssapi_verify_mech_header(u_char **str,
79 mech_len = _gsskrb5_get_mech (*str, total_len, &p);
81 return GSS_S_DEFECTIVE_TOKEN;
83 if (mech_len != mech->length)
84 return GSS_S_BAD_MECH;
88 return GSS_S_BAD_MECH;
91 return GSS_S_COMPLETE;
95 _gsskrb5_verify_header(u_char **str,
104 ret = _gssapi_verify_mech_header(str, total_len, oid);
108 len = total_len - (*str - p);
111 return GSS_S_DEFECTIVE_TOKEN;
113 if (memcmp (*str, type, 2) != 0)
114 return GSS_S_DEFECTIVE_TOKEN;
121 * Remove the GSS-API wrapping from `in_token' giving `out_data.
122 * Does not copy data, so just free `in_token'.
127 OM_uint32 *minor_status,
128 gss_buffer_t input_token_buffer,
136 p = input_token_buffer->value;
137 ret = _gssapi_verify_mech_header(&p,
138 input_token_buffer->length,
145 out_data->length = input_token_buffer->length -
146 (p - (u_char *)input_token_buffer->value);
148 return GSS_S_COMPLETE;
152 * Remove the GSS-API wrapping from `in_token' giving `out_data.
153 * Does not copy data, so just free `in_token'.
157 _gsskrb5_decapsulate(OM_uint32 *minor_status,
158 gss_buffer_t input_token_buffer,
166 p = input_token_buffer->value;
167 ret = _gsskrb5_verify_header(&p,
168 input_token_buffer->length,
176 out_data->length = input_token_buffer->length -
177 (p - (u_char *)input_token_buffer->value);
179 return GSS_S_COMPLETE;
183 * Verify padding of a gss wrapped message and return its length.
187 _gssapi_verify_pad(gss_buffer_t wrapped_token,
195 pad = (u_char *)wrapped_token->value + wrapped_token->length - 1;
198 if (padlength > datalen)
199 return GSS_S_BAD_MECH;
201 for (i = padlength; i > 0 && *pad == padlength; i--, pad--)
204 return GSS_S_BAD_MIC;