1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
3 * Copyright 1993 by OpenVision Technologies, Inc.
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24 #include "gssapiP_krb5.h"
29 /* Checksumming the channel bindings always uses plain MD5. */
31 kg_checksum_channel_bindings(context, cb, cksum)
33 gss_channel_bindings_t cb;
43 /* initialize the the cksum */
44 code = krb5_c_checksum_length(context, CKSUMTYPE_RSA_MD5, &sumlen);
48 cksum->checksum_type = CKSUMTYPE_RSA_MD5;
49 cksum->length = sumlen;
50 cksum->magic = KV5M_CHECKSUM;
52 /* generate a buffer full of zeros if no cb specified */
54 if (cb == GSS_C_NO_CHANNEL_BINDINGS) {
55 if ((cksum->contents = (krb5_octet *) xmalloc(cksum->length)) == NULL) {
58 memset(cksum->contents, '\0', cksum->length);
62 /* create the buffer to checksum into */
64 len = (sizeof(krb5_int32)*5+
65 cb->initiator_address.length+
66 cb->acceptor_address.length+
67 cb->application_data.length);
69 if ((buf = (char *) xmalloc(len)) == NULL)
72 /* helper macros. This code currently depends on a long being 32
73 bits, and htonl dtrt. */
77 TWRITE_INT(ptr, cb->initiator_addrtype, 0);
78 TWRITE_BUF(ptr, cb->initiator_address, 0);
79 TWRITE_INT(ptr, cb->acceptor_addrtype, 0);
80 TWRITE_BUF(ptr, cb->acceptor_address, 0);
81 TWRITE_BUF(ptr, cb->application_data, 0);
83 /* checksum the data */
88 code = krb5_c_make_checksum(context, CKSUMTYPE_RSA_MD5, 0, 0,
96 kg_make_checksum_iov_v1(krb5_context context,
101 krb5_keyusage sign_usage,
102 gss_iov_buffer_desc *iov,
105 krb5_checksum *checksum)
107 krb5_error_code code;
108 gss_iov_buffer_desc *header;
109 krb5_crypto_iov *kiov;
111 size_t conf_len = 0, token_header_len;
113 header = kg_locate_header_iov(iov, iov_count, toktype);
114 assert(header != NULL);
116 kiov = calloc(iov_count + 3, sizeof(krb5_crypto_iov));
120 /* Checksum over ( Header | Confounder | Data | Pad ) */
121 if (toktype == KG_TOK_WRAP_MSG)
122 conf_len = kg_confounder_size(context, enc->keyblock.enctype);
124 /* Checksum output */
125 kiov[i].flags = KRB5_CRYPTO_TYPE_CHECKSUM;
126 kiov[i].data.length = checksum->length;
127 kiov[i].data.data = xmalloc(checksum->length);
128 if (kiov[i].data.data == NULL) {
134 /* Header | SND_SEQ | SGN_CKSUM | Confounder */
135 token_header_len = 16 + cksum_len + conf_len;
137 /* Header (calculate from end because of variable length ASN.1 header) */
138 kiov[i].flags = KRB5_CRYPTO_TYPE_SIGN_ONLY;
139 kiov[i].data.length = 8;
140 kiov[i].data.data = (char *)header->buffer.value + header->buffer.length - token_header_len;
144 if (toktype == KG_TOK_WRAP_MSG) {
145 kiov[i].flags = KRB5_CRYPTO_TYPE_DATA;
146 kiov[i].data.length = conf_len;
147 kiov[i].data.data = (char *)header->buffer.value + header->buffer.length - conf_len;
151 for (j = 0; j < iov_count; j++) {
152 kiov[i].flags = kg_translate_flag_iov(iov[j].type);
153 kiov[i].data.length = iov[j].buffer.length;
154 kiov[i].data.data = (char *)iov[j].buffer.value;
158 code = krb5_k_make_checksum_iov(context, type, seq, sign_usage, kiov, i);
160 checksum->length = kiov[0].data.length;
161 checksum->contents = (unsigned char *)kiov[0].data.data;
163 free(kiov[0].data.data);
170 static krb5_error_code
171 checksum_iov_v3(krb5_context context,
175 krb5_keyusage sign_usage,
176 gss_iov_buffer_desc *iov,
182 krb5_error_code code;
183 gss_iov_buffer_desc *header;
184 gss_iov_buffer_desc *trailer;
185 krb5_crypto_iov *kiov;
188 unsigned int k5_checksumlen;
193 code = krb5_c_crypto_length(context, key->keyblock.enctype, KRB5_CRYPTO_TYPE_CHECKSUM, &k5_checksumlen);
197 header = kg_locate_header_iov(iov, iov_count, toktype);
198 assert(header != NULL);
200 trailer = kg_locate_iov(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
201 assert(rrc != 0 || trailer != NULL);
203 if (trailer == NULL) {
204 if (rrc != k5_checksumlen)
205 return KRB5_BAD_MSIZE;
206 if (header->buffer.length != 16 + k5_checksumlen)
207 return KRB5_BAD_MSIZE;
208 } else if (trailer->buffer.length != k5_checksumlen)
209 return KRB5_BAD_MSIZE;
211 kiov_count = 2 + iov_count;
212 kiov = (krb5_crypto_iov *)xmalloc(kiov_count * sizeof(krb5_crypto_iov));
216 /* Checksum over ( Data | Header ) */
219 for (j = 0; j < iov_count; j++) {
220 kiov[i].flags = kg_translate_flag_iov(iov[j].type);
221 kiov[i].data.length = iov[j].buffer.length;
222 kiov[i].data.data = (char *)iov[j].buffer.value;
227 kiov[i].flags = KRB5_CRYPTO_TYPE_SIGN_ONLY;
228 kiov[i].data.length = 16;
229 kiov[i].data.data = (char *)header->buffer.value;
233 kiov[i].flags = KRB5_CRYPTO_TYPE_CHECKSUM;
234 if (trailer == NULL) {
235 kiov[i].data.length = header->buffer.length - 16;
236 kiov[i].data.data = (char *)header->buffer.value + 16;
238 kiov[i].data.length = trailer->buffer.length;
239 kiov[i].data.data = (char *)trailer->buffer.value;
244 code = krb5_k_verify_checksum_iov(context, type, key, sign_usage, kiov, kiov_count, valid);
246 code = krb5_k_make_checksum_iov(context, type, key, sign_usage, kiov, kiov_count);
254 kg_make_checksum_iov_v3(krb5_context context,
258 krb5_keyusage sign_usage,
259 gss_iov_buffer_desc *iov,
263 return checksum_iov_v3(context, type, rrc, key,
264 sign_usage, iov, iov_count, toktype, 0, NULL);
268 kg_verify_checksum_iov_v3(krb5_context context,
272 krb5_keyusage sign_usage,
273 gss_iov_buffer_desc *iov,
278 return checksum_iov_v3(context, type, rrc, key,
279 sign_usage, iov, iov_count, toktype, 1, valid);