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80 #include "gssapiP_eap.h"
83 * DCE_STYLE indicates actual RRC is EC + RRC
84 * EC is extra rotate count for DCE_STYLE, pad length otherwise
85 * RRC is rotate count.
87 static krb5_error_code
88 mapIov(krb5_context context, int dce_style, size_t ec, size_t rrc,
89 krb5_enctype enctype, gss_iov_buffer_desc *iov,
90 int iov_count, krb5_crypto_iov **pkiov,
93 gss_iov_buffer_t header;
94 gss_iov_buffer_t trailer;
97 krb5_crypto_iov *kiov;
98 unsigned int k5_headerlen = 0, k5_trailerlen = 0;
99 size_t gss_headerlen, gss_trailerlen;
100 krb5_error_code code;
105 header = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
106 assert(header != NULL);
108 trailer = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
109 assert(trailer == NULL || rrc == 0);
111 code = krb5_c_crypto_length(context, enctype, KRB5_CRYPTO_TYPE_HEADER,
116 code = krb5_c_crypto_length(context, enctype, KRB5_CRYPTO_TYPE_TRAILER,
121 /* Check header and trailer sizes */
122 gss_headerlen = 16 /* GSS-Header */ + k5_headerlen; /* Kerb-Header */
123 gss_trailerlen = ec + 16 /* E(GSS-Header) */ + k5_trailerlen; /* Kerb-Trailer */
125 /* If we're caller without a trailer, we must rotate by trailer length */
126 if (trailer == NULL) {
127 size_t actual_rrc = rrc;
130 actual_rrc += ec; /* compensate for Windows bug */
132 if (actual_rrc != gss_trailerlen)
133 return KRB5_BAD_MSIZE;
135 gss_headerlen += gss_trailerlen;
138 if (trailer->buffer.length != gss_trailerlen)
139 return KRB5_BAD_MSIZE;
142 if (header->buffer.length != gss_headerlen)
143 return KRB5_BAD_MSIZE;
145 kiov_count = 3 + iov_count;
146 kiov = (krb5_crypto_iov *)GSSEAP_MALLOC(kiov_count * sizeof(krb5_crypto_iov));
151 * The krb5 header is located at the end of the GSS header.
153 kiov[i].flags = KRB5_CRYPTO_TYPE_HEADER;
154 kiov[i].data.length = k5_headerlen;
155 kiov[i].data.data = (char *)header->buffer.value + header->buffer.length - k5_headerlen;
158 for (j = 0; j < iov_count; j++) {
159 kiov[i].flags = gssEapMapCryptoFlag(iov[j].type);
160 if (kiov[i].flags == KRB5_CRYPTO_TYPE_EMPTY)
163 kiov[i].data.length = iov[j].buffer.length;
164 kiov[i].data.data = (char *)iov[j].buffer.value;
169 * The EC and encrypted GSS header are placed in the trailer, which may
170 * be rotated directly after the plaintext header if no trailer buffer
173 kiov[i].flags = KRB5_CRYPTO_TYPE_DATA;
174 kiov[i].data.length = ec + 16; /* E(Header) */
176 kiov[i].data.data = (char *)header->buffer.value + 16;
178 kiov[i].data.data = (char *)trailer->buffer.value;
182 * The krb5 trailer is placed after the encrypted copy of the
183 * krb5 header (which may be in the GSS header or trailer).
185 kiov[i].flags = KRB5_CRYPTO_TYPE_TRAILER;
186 kiov[i].data.length = k5_trailerlen;
187 kiov[i].data.data = kiov[i - 1].data.data + ec + 16; /* E(Header) */
197 gssEapEncrypt(krb5_context context, int dce_style, size_t ec,
198 size_t rrc, krb5_keyblock *key, int usage, krb5_pointer iv,
199 gss_iov_buffer_desc *iov, int iov_count)
201 krb5_error_code code;
203 krb5_data ivd, *pivd;
205 krb5_crypto_iov *kiov;
208 code = krb5_c_block_size(context, KRB_KEYTYPE(key), &blocksize);
212 ivd.length = blocksize;
213 ivd.data = GSSEAP_MALLOC(ivd.length);
214 if (ivd.data == NULL)
216 memcpy(ivd.data, iv, ivd.length);
222 code = mapIov(context, dce_style, ec, rrc,
223 KRB_KEYTYPE(key), iov, iov_count,
226 code = krb5_c_encrypt_iov(context, key, usage, pivd, kiov, kiov_count);
231 GSSEAP_FREE(pivd->data);
237 gssEapDecrypt(krb5_context context, int dce_style, size_t ec,
238 size_t rrc, krb5_keyblock *key, int usage, krb5_pointer iv,
239 gss_iov_buffer_desc *iov, int iov_count)
241 krb5_error_code code;
243 krb5_data ivd, *pivd;
245 krb5_crypto_iov *kiov;
248 code = krb5_c_block_size(context, KRB_KEYTYPE(key), &blocksize);
252 ivd.length = blocksize;
253 ivd.data = GSSEAP_MALLOC(ivd.length);
254 if (ivd.data == NULL)
256 memcpy(ivd.data, iv, ivd.length);
262 code = mapIov(context, dce_style, ec, rrc,
263 KRB_KEYTYPE(key), iov, iov_count,
266 code = krb5_c_decrypt_iov(context, key, usage, pivd, kiov, kiov_count);
271 GSSEAP_FREE(pivd->data);
277 gssEapMapCryptoFlag(OM_uint32 type)
279 krb5_cryptotype ktype;
281 switch (GSS_IOV_BUFFER_TYPE(type)) {
282 case GSS_IOV_BUFFER_TYPE_DATA:
283 case GSS_IOV_BUFFER_TYPE_PADDING:
284 ktype = KRB5_CRYPTO_TYPE_DATA;
286 case GSS_IOV_BUFFER_TYPE_SIGN_ONLY:
287 ktype = KRB5_CRYPTO_TYPE_SIGN_ONLY;
290 ktype = KRB5_CRYPTO_TYPE_EMPTY;
298 gssEapLocateIov(gss_iov_buffer_desc *iov, int iov_count, OM_uint32 type)
301 gss_iov_buffer_t p = GSS_C_NO_IOV_BUFFER;
303 if (iov == GSS_C_NO_IOV_BUFFER)
304 return GSS_C_NO_IOV_BUFFER;
306 for (i = iov_count - 1; i >= 0; i--) {
307 if (GSS_IOV_BUFFER_TYPE(iov[i].type) == type) {
308 if (p == GSS_C_NO_IOV_BUFFER)
311 return GSS_C_NO_IOV_BUFFER;
319 gssEapIovMessageLnegth(gss_iov_buffer_desc *iov,
321 size_t *data_length_p,
322 size_t *assoc_data_length_p)
325 size_t data_length = 0, assoc_data_length = 0;
327 assert(iov != GSS_C_NO_IOV_BUFFER);
329 *data_length_p = *assoc_data_length_p = 0;
331 for (i = 0; i < iov_count; i++) {
332 OM_uint32 type = GSS_IOV_BUFFER_TYPE(iov[i].type);
334 if (type == GSS_IOV_BUFFER_TYPE_SIGN_ONLY)
335 assoc_data_length += iov[i].buffer.length;
337 if (type == GSS_IOV_BUFFER_TYPE_DATA ||
338 type == GSS_IOV_BUFFER_TYPE_SIGN_ONLY)
339 data_length += iov[i].buffer.length;
342 *data_length_p = data_length;
343 *assoc_data_length_p = assoc_data_length;
347 gssEapReleaseIov(gss_iov_buffer_desc *iov, int iov_count)
352 assert(iov != GSS_C_NO_IOV_BUFFER);
354 for (i = 0; i < iov_count; i++) {
355 if (iov[i].type & GSS_IOV_BUFFER_FLAG_ALLOCATED) {
356 gss_release_buffer(&min_stat, &iov[i].buffer);
357 iov[i].type &= ~(GSS_IOV_BUFFER_FLAG_ALLOCATED);
363 gssEapIsIntegrityOnly(gss_iov_buffer_desc *iov, int iov_count)
366 krb5_boolean has_conf_data = FALSE;
368 assert(iov != GSS_C_NO_IOV_BUFFER);
370 for (i = 0; i < iov_count; i++) {
371 if (GSS_IOV_BUFFER_TYPE(iov[i].type) == GSS_IOV_BUFFER_TYPE_DATA) {
372 has_conf_data = TRUE;
377 return (has_conf_data == FALSE);
381 gssEapAllocIov(gss_iov_buffer_t iov, size_t size)
383 assert(iov != GSS_C_NO_IOV_BUFFER);
384 assert(iov->type & GSS_IOV_BUFFER_FLAG_ALLOCATE);
386 iov->buffer.length = size;
387 iov->buffer.value = GSSEAP_MALLOC(size);
388 if (iov->buffer.value == NULL) {
389 iov->buffer.length = 0;
393 iov->type |= GSS_IOV_BUFFER_FLAG_ALLOCATED;