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57 * Message protection services: wrap with scatter-gather API.
60 #include "gssapiP_eap.h"
63 rfc4121Flags(gss_ctx_id_t ctx, int receiving)
68 isAcceptor = !CTX_IS_INITIATOR(ctx);
70 isAcceptor = !isAcceptor;
74 flags |= TOK_FLAG_SENDER_IS_ACCEPTOR;
76 if ((ctx->flags & CTX_FLAG_KRB_REAUTH) &&
77 (ctx->gssFlags & GSS_C_MUTUAL_FLAG))
78 flags |= TOK_FLAG_ACCEPTOR_SUBKEY;
84 gssEapWrapOrGetMIC(OM_uint32 *minor,
88 gss_iov_buffer_desc *iov,
90 enum gss_eap_token_type toktype)
92 krb5_error_code code = 0;
93 gss_iov_buffer_t header;
94 gss_iov_buffer_t padding;
95 gss_iov_buffer_t trailer;
97 unsigned char *outbuf = NULL;
98 unsigned char *tbuf = NULL;
101 unsigned int gssHeaderLen, gssTrailerLen;
102 size_t dataLen, assocDataLen;
103 krb5_context krbContext;
105 if (ctx->encryptionType == ENCTYPE_NULL) {
106 *minor = GSSEAP_KEY_UNAVAILABLE;
107 return GSS_S_UNAVAILABLE;
110 GSSEAP_KRB_INIT(&krbContext);
112 flags = rfc4121Flags(ctx, FALSE);
114 if (toktype == TOK_TYPE_WRAP) {
115 keyUsage = CTX_IS_INITIATOR(ctx)
116 ? KEY_USAGE_INITIATOR_SEAL
117 : KEY_USAGE_ACCEPTOR_SEAL;
119 keyUsage = CTX_IS_INITIATOR(ctx)
120 ? KEY_USAGE_INITIATOR_SIGN
121 : KEY_USAGE_ACCEPTOR_SIGN;
124 gssEapIovMessageLength(iov, iov_count, &dataLen, &assocDataLen);
126 header = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
127 if (header == NULL) {
128 *minor = GSSEAP_MISSING_IOV;
129 return GSS_S_FAILURE;
132 padding = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING);
134 padding->buffer.length = 0;
136 trailer = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
138 if (toktype == TOK_TYPE_WRAP && conf_req_flag) {
139 unsigned int krbHeaderLen, krbTrailerLen, krbPadLen;
141 size_t confDataLen = dataLen - assocDataLen;
143 code = krb5_c_crypto_length(krbContext, ctx->encryptionType,
144 KRB5_CRYPTO_TYPE_HEADER, &krbHeaderLen);
148 code = krb5_c_padding_length(krbContext, ctx->encryptionType,
149 confDataLen + 16 /* E(Header) */,
154 if (krbPadLen == 0 && (ctx->gssFlags & GSS_C_DCE_STYLE)) {
155 /* Windows rejects AEAD tokens with non-zero EC */
156 code = krb5_c_block_size(krbContext, ctx->encryptionType, &ec);
162 code = krb5_c_crypto_length(krbContext, ctx->encryptionType,
163 KRB5_CRYPTO_TYPE_TRAILER, &krbTrailerLen);
167 gssHeaderLen = 16 /* Header */ + krbHeaderLen;
168 gssTrailerLen = ec + 16 /* E(Header) */ + krbTrailerLen;
170 if (trailer == NULL) {
172 /* Workaround for Windows bug where it rotates by EC + RRC */
173 if (ctx->gssFlags & GSS_C_DCE_STYLE)
175 gssHeaderLen += gssTrailerLen;
178 if (header->type & GSS_IOV_BUFFER_FLAG_ALLOCATE) {
179 code = gssEapAllocIov(header, (size_t)gssHeaderLen);
180 } else if (header->buffer.length < gssHeaderLen)
181 code = GSSEAP_WRONG_SIZE;
184 outbuf = (unsigned char *)header->buffer.value;
185 header->buffer.length = (size_t)gssHeaderLen;
187 if (trailer != NULL) {
188 if (trailer->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
189 code = gssEapAllocIov(trailer, (size_t)gssTrailerLen);
190 else if (trailer->buffer.length < gssTrailerLen)
191 code = GSSEAP_WRONG_SIZE;
194 trailer->buffer.length = (size_t)gssTrailerLen;
198 store_uint16_be((uint16_t)toktype, outbuf);
201 | (conf_req_flag ? TOK_FLAG_WRAP_CONFIDENTIAL : 0);
205 store_uint16_be(ec, outbuf + 4);
207 store_uint16_be(0, outbuf + 6);
208 store_uint64_be(ctx->sendSeq, outbuf + 8);
211 * EC | copy of header to be encrypted, located in
212 * (possibly rotated) trailer
215 tbuf = (unsigned char *)header->buffer.value + 16; /* Header */
217 tbuf = (unsigned char *)trailer->buffer.value;
219 memset(tbuf, 0xFF, ec);
220 memcpy(tbuf + ec, header->buffer.value, 16);
222 code = gssEapEncrypt(krbContext,
223 ((ctx->gssFlags & GSS_C_DCE_STYLE) != 0),
224 ec, rrc, &ctx->rfc3961Key,
225 keyUsage, 0, iov, iov_count);
230 store_uint16_be(rrc, outbuf + 6);
233 } else if (toktype == TOK_TYPE_WRAP && !conf_req_flag) {
238 code = krb5_c_crypto_length(krbContext, ctx->encryptionType,
239 KRB5_CRYPTO_TYPE_CHECKSUM,
244 assert(gssTrailerLen <= 0xFFFF);
246 if (trailer == NULL) {
248 gssHeaderLen += gssTrailerLen;
251 if (header->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
252 code = gssEapAllocIov(header, (size_t)gssHeaderLen);
253 else if (header->buffer.length < gssHeaderLen)
254 code = GSSEAP_WRONG_SIZE;
257 outbuf = (unsigned char *)header->buffer.value;
258 header->buffer.length = (size_t)gssHeaderLen;
260 if (trailer != NULL) {
261 if (trailer->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
262 code = gssEapAllocIov(trailer, (size_t)gssTrailerLen);
263 else if (trailer->buffer.length < gssTrailerLen)
264 code = GSSEAP_WRONG_SIZE;
267 trailer->buffer.length = (size_t)gssTrailerLen;
271 store_uint16_be((uint16_t)toktype, outbuf);
276 if (toktype == TOK_TYPE_WRAP) {
277 /* Use 0 for checksum calculation, substitute
278 * checksum length later.
281 store_uint16_be(0, outbuf + 4);
283 store_uint16_be(0, outbuf + 6);
285 /* MIC and DEL store 0xFF in EC and RRC */
286 store_uint16_be(0xFFFF, outbuf + 4);
287 store_uint16_be(0xFFFF, outbuf + 6);
289 store_uint64_be(ctx->sendSeq, outbuf + 8);
291 code = gssEapSign(krbContext, ctx->checksumType,
292 rrc, &ctx->rfc3961Key, keyUsage,
299 if (toktype == TOK_TYPE_WRAP) {
300 /* Fix up EC field */
301 store_uint16_be(gssTrailerLen, outbuf + 4);
302 /* Fix up RRC field */
303 store_uint16_be(rrc, outbuf + 6);
305 } else if (toktype == TOK_TYPE_MIC) {
307 goto wrap_with_checksum;
308 } else if (toktype == TOK_TYPE_DELETE_CONTEXT) {
310 goto wrap_with_checksum;
319 gssEapReleaseIov(iov, iov_count);
323 return (code == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;
327 gss_wrap_iov(OM_uint32 *minor,
332 gss_iov_buffer_desc *iov,
337 if (ctx == GSS_C_NO_CONTEXT) {
339 return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_NO_CONTEXT;
342 if (qop_req != GSS_C_QOP_DEFAULT) {
343 *minor = GSSEAP_UNKNOWN_QOP;
344 return GSS_S_UNAVAILABLE;
349 GSSEAP_MUTEX_LOCK(&ctx->mutex);
351 if (!CTX_IS_ESTABLISHED(ctx)) {
352 major = GSS_S_NO_CONTEXT;
353 *minor = GSSEAP_CONTEXT_INCOMPLETE;
357 major = gssEapWrapOrGetMIC(minor, ctx, conf_req_flag, conf_state,
358 iov, iov_count, TOK_TYPE_WRAP);
359 if (GSS_ERROR(major))
363 GSSEAP_MUTEX_UNLOCK(&ctx->mutex);