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34 #include "gssapi_locl.h"
36 RCSID("$Id: 8003.c,v 1.11 2002/03/10 23:47:39 assar Exp $");
38 static krb5_error_code
39 encode_om_uint32(OM_uint32 n, u_char *p)
41 p[0] = (n >> 0) & 0xFF;
42 p[1] = (n >> 8) & 0xFF;
43 p[2] = (n >> 16) & 0xFF;
44 p[3] = (n >> 24) & 0xFF;
48 static krb5_error_code
49 decode_om_uint32(u_char *p, OM_uint32 *n)
51 *n = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
55 static krb5_error_code
56 hash_input_chan_bindings (const gss_channel_bindings_t b,
63 encode_om_uint32 (b->initiator_addrtype, num);
64 MD5_Update (&md5, num, sizeof(num));
65 encode_om_uint32 (b->initiator_address.length, num);
66 MD5_Update (&md5, num, sizeof(num));
67 if (b->initiator_address.length)
69 b->initiator_address.value,
70 b->initiator_address.length);
71 encode_om_uint32 (b->acceptor_addrtype, num);
72 MD5_Update (&md5, num, sizeof(num));
73 encode_om_uint32 (b->acceptor_address.length, num);
74 MD5_Update (&md5, num, sizeof(num));
75 if (b->acceptor_address.length)
77 b->acceptor_address.value,
78 b->acceptor_address.length);
79 encode_om_uint32 (b->application_data.length, num);
80 MD5_Update (&md5, num, sizeof(num));
81 if (b->application_data.length)
83 b->application_data.value,
84 b->application_data.length);
90 * create a checksum over the chanel bindings in
91 * `input_chan_bindings', `flags' and `fwd_data' and return it in
96 gssapi_krb5_create_8003_checksum (
97 OM_uint32 *minor_status,
98 const gss_channel_bindings_t input_chan_bindings,
100 const krb5_data *fwd_data,
106 * see rfc1964 (section 1.1.1 (Initial Token), and the checksum value
108 result->cksumtype = 0x8003;
109 if (fwd_data->length > 0 && (flags & GSS_C_DELEG_FLAG))
110 result->checksum.length = 24 + 4 + fwd_data->length;
112 result->checksum.length = 24;
113 result->checksum.data = malloc (result->checksum.length);
114 if (result->checksum.data == NULL) {
115 *minor_status = ENOMEM;
116 return GSS_S_FAILURE;
119 p = result->checksum.data;
120 encode_om_uint32 (16, p);
122 if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS) {
125 hash_input_chan_bindings (input_chan_bindings, p);
128 encode_om_uint32 (flags, p);
131 if (fwd_data->length > 0 && (flags & GSS_C_DELEG_FLAG)) {
135 result->checksum.length = 28 + fwd_data->length;
136 tmp = realloc(result->checksum.data, result->checksum.length);
139 result->checksum.data = tmp;
141 p = (u_char*)result->checksum.data + 24;
143 *p++ = (1 >> 0) & 0xFF; /* DlgOpt */ /* == 1 */
144 *p++ = (1 >> 8) & 0xFF; /* DlgOpt */ /* == 0 */
145 *p++ = (fwd_data->length >> 0) & 0xFF; /* Dlgth */
146 *p++ = (fwd_data->length >> 8) & 0xFF; /* Dlgth */
147 memcpy(p, (unsigned char *) fwd_data->data, fwd_data->length);
149 p += fwd_data->length;
152 return GSS_S_COMPLETE;
156 * verify the checksum in `cksum' over `input_chan_bindings'
157 * returning `flags' and `fwd_data'
161 gssapi_krb5_verify_8003_checksum(
162 OM_uint32 *minor_status,
163 const gss_channel_bindings_t input_chan_bindings,
164 const Checksum *cksum,
168 unsigned char hash[16];
172 static unsigned char zeros[16];
174 /* XXX should handle checksums > 24 bytes */
175 if(cksum->cksumtype != 0x8003) {
177 return GSS_S_BAD_BINDINGS;
180 p = cksum->checksum.data;
181 decode_om_uint32(p, &length);
182 if(length != sizeof(hash)) {
184 return GSS_S_BAD_BINDINGS;
189 if (input_chan_bindings != GSS_C_NO_CHANNEL_BINDINGS
190 && memcmp(p, zeros, sizeof(zeros)) != 0) {
191 if(hash_input_chan_bindings(input_chan_bindings, hash) != 0) {
193 return GSS_S_BAD_BINDINGS;
195 if(memcmp(hash, p, sizeof(hash)) != 0) {
197 return GSS_S_BAD_BINDINGS;
203 decode_om_uint32(p, flags);
205 if (cksum->checksum.length > 24 && (*flags & GSS_C_DELEG_FLAG)) {
209 DlgOpt = (p[0] << 0) | (p[1] << 8 );
212 return GSS_S_BAD_BINDINGS;
216 fwd_data->length = (p[0] << 0) | (p[1] << 8);
217 fwd_data->data = malloc(fwd_data->length);
218 if (fwd_data->data == NULL) {
219 *minor_status = ENOMEM;
220 return GSS_S_FAILURE;
224 memcpy(fwd_data->data, p, fwd_data->length);
227 return GSS_S_COMPLETE;